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Yan J, Wang X, Fan Z, Xu Y, Zhang Y, Liu Y, Guo L, Liu D. Circ_0098823 binding with IGF2BP3 regulates DNM1L stability to promote metastasis of hepatocellular carcinoma via mitochondrial fission. Apoptosis 2024; 29:709-725. [PMID: 38459420 DOI: 10.1007/s10495-023-01903-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2023] [Indexed: 03/10/2024]
Abstract
Hepatocellular carcinoma (HCC) is highly metastatic and invasive. CircRNA participates in gene regulation of multiple tumor metastases, but little is known whether it is a bystander or an actual player in HCC metastasis. We aim to explore the molecular mechanisms of novel circRNAs in HCC metastasis. RT-qPCR was used to detect the expression of 13 circRNAs derived by the ERBB3 gene. The function of circ_0098823 and DNM1L in HCC cells were estimated by CCK-8, transwell assays, flow cytometry, electron microscope, and in vivo experiments. RNA binding protein of circ_0098823 was confirmed by RNA pull-down, mass spectrometry, and RNA immunoprecipitation. The expression of DNM1L after IGF2BP3 knockdown was detected by RT-qPCR and western blot. Circ_0098823 was significantly up-regulated both in HCC tissues and HGF induced cell lines. Circ_0098823 overexpression significantly enhanced proliferation, migration, and invasion but decreased apoptosis of HCC cells, particularly promoted mitochondrial fission. Compared with the control group, the tumors in the circ_0098823 knockdown mice were significantly smaller and lighter. Circ_0098823 silencing suppressed DNM1L expression, a key molecule for fission, which enhanced proliferation, migration and invasion, and inhibited apoptosis of HCC cell. IGF2BP3 was a binding protein of circ_0098823. The expression and mRNA stability of DNM1L were down-regulated by IGF2BP3 knockdown. IGF2BP3 knockdown significantly alleviated the excessive migration, invasion and apoptosis of HCC cells caused by circ_0098823 overexpression. This study uncovered a novel circ_0098823 with tumor-promoting effect, and the mechanism by which circ_0098823 participates in HCC progression through IGF2BP3-guided DNM1L. Our study broadens molecular understanding of HCC progression.
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Affiliation(s)
- Jiuliang Yan
- Department of Pancreatic Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Xiaofeng Wang
- Department of Medical Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Zongyu Fan
- Department of Oral and Maxillofacial-Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Yiqing Xu
- Department of Radiation Oncology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No.85, Wujin Road, Hongkou District, Shanghai, 200080, China
| | - Yingzi Zhang
- Department of Radiation Oncology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No.85, Wujin Road, Hongkou District, Shanghai, 200080, China
| | - Yi Liu
- Department of Radiation Oncology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No.85, Wujin Road, Hongkou District, Shanghai, 200080, China
| | - Lei Guo
- Department of Liver Surgery and Transplantation, Liver Cancer Institute, Zhongshan Hospital, Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Fudan University, Shanghai, 200032, China.
| | - Dongli Liu
- Department of Radiation Oncology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No.85, Wujin Road, Hongkou District, Shanghai, 200080, China.
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Ringo JM, Segal D. Altered Grooming Cycles in Transgenic Drosophila. Behav Genet 2024; 54:290-301. [PMID: 38536593 DOI: 10.1007/s10519-024-10180-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 03/14/2024] [Indexed: 04/21/2024]
Abstract
Head grooming in Drosophila consists of repeated sweeps of the legs across the head, comprising regular cycles. We used the GAL4-UAS system to study the effects of overexpressing shibirets1 and of Adar knockdown via RNA interference, on the period of head-grooming cycles in Drosophila. Overexpressing shibirets1 interferes with synaptic vesicle recycling and thus with cell communication, while Adar knockdown reduces RNA editing of neuronal transcripts for a large number of genes. All transgenic flies and their controls were tested at 22° to avoid temperature effects; in wild type, cycle frequency varied with temperature with a Q10 of 1.3. Two experiments were performed with transgenic shibirets1: (1) each fly was heat-shocked for 10 min at 30° immediately before testing at 22° and (2) flies were not heat shocked. In both experiments, cycle period was increased when shibirets1 was overexpressed in all neurons, but was not increased when shibirets1 was overexpressed in motoneurons alone. We hypothesize that grooming cycles in flies overexpressing shibirets1 are lengthened because of synaptic impairment in neural circuits that control head-grooming cycles. In flies with constitutive, pan-neuronal Adar knockdown, cycle period was more variable within individuals, but mean cycle period was not significantly altered. We conclude that RNA editing is essential for the maintenance of within-individual stereotypy of head-grooming cycles.
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Affiliation(s)
- John M Ringo
- School of Biology and Ecology, University of Maine, Orono, ME, 04473, USA.
| | - Daniel Segal
- Shmunis School of Biomedicine and Cancer Research, Sagol School of Neuroscience, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 69978, Israel
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Tang S, Huang M, Wang R, Li M, Dong N, Wu R, Chi Z, Gao L. Drp1-dependent mitochondrial fragmentation mediates photoreceptor abnormalities in type 1 diabetic retina. Exp Eye Res 2024; 242:109860. [PMID: 38467174 DOI: 10.1016/j.exer.2024.109860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 01/27/2024] [Accepted: 03/08/2024] [Indexed: 03/13/2024]
Abstract
Recent studies have highlighted that retinal neurodegeneration precedes microvascular changes in diabetic retinopathy (DR), but the specific mechanisms remain unclear. Given the pivotal role of dysfunctional mitochondria and oxidative stress in early DR, our objective was to observe mitochondria-related alterations in the neural retina of type one diabetic mellitus mice with no evidence of DR (T1DM-NDR). We aimed to identify the key mitochondrial-related proteins contributing to mitochondrial injury. Our study revealed that T1DM-NDR mice exhibited outer retina thinning, including the ellipsoid zone, inner segment, and outer segment. Additionally, there was an impaired amplitude of the b-wave in electroretinogram (ERG) and a disorganized arrangement of the photoreceptor layer. In both the retina of DM mice and high glucose (HG)-treated 661w cells, mitochondria appeared swollen and fragmented, with disrupted cristae, disorganized or shortened branches in the mitochondrial network, and decreased mitochondrial membrane potential. Among the mitochondrial-related proteins, dynamin-related protein 1 (Drp1) was upregulated, and the ratio of phosphorylated Drp1 protein at serine 616 (S616) and serine 637 (S637) sites significantly increased in the retina of DM mice. The administration of Mdivi-1 ameliorated high-glucose-induced dysfunctional mitochondria, thereby protecting T1DM-NDR mice retina from morphological and functional injuries. Our findings suggest that hyperglycemia promotes Drp1-mediated mitochondrial dysfunction, which may be a significant factor in the development of DR. The inhibition of high-glucose-induced mitochondrial fission emerges as a potential and innovative intervention strategy for preventing DR.
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Affiliation(s)
- Shuyu Tang
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Mengling Huang
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Ruixuan Wang
- Bourns Engineering, The University of California, Riverside, Riverside, CA, 92521, United States
| | - Ming Li
- Department of Immunology, College of Basic Medical Immunology, Central South University, Changsha, China
| | - Ning Dong
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Ronghan Wu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital of Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases, Eye Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zailong Chi
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital of Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases, Eye Hospital of Wenzhou Medical University, Wenzhou, China.
| | - Ling Gao
- Department of Ophthalmology, The Second Xiangya Hospital, Central South University, Changsha, China; State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital of Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases, Eye Hospital of Wenzhou Medical University, Wenzhou, China.
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Latha Laxmi IP, Job AT, Manickam V, Tamizhselvi R. Intertwined relationship of dynamin-related protein 1, mitochondrial metabolism and circadian rhythm. Mol Biol Rep 2024; 51:488. [PMID: 38578426 DOI: 10.1007/s11033-024-09430-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 03/08/2024] [Indexed: 04/06/2024]
Abstract
In recent years, mitochondria have gained significant interest in the field of biomedical research due to their impact on human health and ageing. As mitochondrial dynamics are strongly controlled by clock genes, misalignment of the circadian rhythm leads to adverse metabolic health effects. In this review, by exploring various aspects of research and potential links, we hope to update the current understanding of the intricate relationship between DRP1-mediated mitochondrial dynamics and changes in circadian rhythmicity leading to health issues. Thus, this review addresses the potential bidirectional relationships between DRP1-linked mitochondrial function and circadian rhythm misalignment, their impact on different metabolic pathways, and the potential therapeutics for metabolic and systemic disorders.
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Affiliation(s)
| | - Anica Tholath Job
- Department of Biotechnology, National Institute of Technology, Warangal, 506004, Telangana, India
| | - Venkatraman Manickam
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, 632104, Tamil Nadu, India
| | - Ramasamy Tamizhselvi
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, 632104, Tamil Nadu, India.
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Liu X, Xu L, Song Y, Zhao Z, Li X, Wong CY, Chen R, Feng J, Gou Y, Qi Y, Chow HM, Yao S, Wang Y, Gao S, Liu X, Duan L. Force-induced tail-autotomy mitochondrial fission and biogenesis of matrix-excluded mitochondrial-derived vesicles for quality control. Proc Natl Acad Sci U S A 2024; 121:e2217019121. [PMID: 38547062 PMCID: PMC10998583 DOI: 10.1073/pnas.2217019121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 02/26/2024] [Indexed: 04/02/2024] Open
Abstract
Mitochondria constantly fuse and divide for mitochondrial inheritance and functions. Here, we identified a distinct type of naturally occurring fission, tail-autotomy fission, wherein a tail-like thin tubule protrudes from the mitochondrial body and disconnects, resembling autotomy. Next, utilizing an optogenetic mitochondria-specific mechanostimulator, we revealed that mechanical tensile force drives tail-autotomy fission. This force-induced fission involves DRP1/MFF and endoplasmic reticulum tubule wrapping. It redistributes mitochondrial DNA, producing mitochondrial fragments with or without mitochondrial DNA for different fates. Moreover, tensile force can decouple outer and inner mitochondrial membranes, pulling out matrix-excluded tubule segments. Subsequent tail-autotomy fission separates the matrix-excluded tubule segments into matrix-excluded mitochondrial-derived vesicles (MDVs) which recruit Parkin and LC3B, indicating the unique role of tail-autotomy fission in segregating only outer membrane components for mitophagy. Sustained force promotes fission and MDV biogenesis more effectively than transient one. Our results uncover a mechanistically and functionally distinct type of fission and unveil the role of tensile forces in modulating fission and MDV biogenesis for quality control, underscoring the heterogeneity of fission and mechanoregulation of mitochondrial dynamics.
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Affiliation(s)
- Xiaoying Liu
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Linyu Xu
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Yutong Song
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Zhihao Zhao
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Xinyu Li
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Cheuk-Yiu Wong
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Rong Chen
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR999077, China
| | - Jianxiong Feng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou510060, China
| | - Yitao Gou
- Department of Physics, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Yajing Qi
- Department of Physics, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Hei-Man Chow
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR999077, China
- Gerald Choa Neuroscience Institute, The Chinese University of Hong Kong, Hong Kong SAR999077, China
- Nexus of Rare Neurodegenerative Diseases, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Shuhuai Yao
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR999077, China
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR999077, China
| | - Yi Wang
- Department of Physics, The Chinese University of Hong Kong, Hong Kong SAR999077, China
| | - Song Gao
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou510060, China
| | - Xingguo Liu
- Chinese Academy of Sciences Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, China-New Zealand Joint Laboratory on Biomedicine and Health, Chinese University of Hong Kong-Guangzhou Institutes of Biomedicine and Health (CUHK-GIBH) Joint Research Laboratory on Stem Cells and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou Medical University, Guangzhou510000, China
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong SAR999077, China
| | - Liting Duan
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR999077, China
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Abudureyimu M, Luo X, Jiang L, Jin X, Pan C, Yu W, Ge J, Zhang Y, Ren J. FBXL4 protects against HFpEF through Drp1-Mediated regulation of mitochondrial dynamics and the downstream SERCA2a. Redox Biol 2024; 70:103081. [PMID: 38359748 PMCID: PMC10878117 DOI: 10.1016/j.redox.2024.103081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 02/17/2024] Open
Abstract
AIMS Heart failure with preserved ejection fraction (HFpEF) is a devastating health issue although limited knowledge is available for its pathogenesis and therapeutics. Given the perceived involvement of mitochondrial dysfunction in HFpEF, this study was designed to examine the role of mitochondrial dynamics in the etiology of HFpEF. METHOD AND RESULTS Adult mice were placed on a high fat diet plus l-NAME in drinking water ('two-hit' challenge to mimic obesity and hypertension) for 15 consecutive weeks. Mass spectrometry revealed pronounced changes in mitochondrial fission protein Drp1 and E3 ligase FBXL4 in 'two-hit' mouse hearts. Transfection of FBXL4 rescued against HFpEF-compromised diastolic function, cardiac geometry, and mitochondrial integrity without affecting systolic performance, in conjunction with altered mitochondrial dynamics and integrity (hyperactivation of Drp1 and unchecked fission). Mass spectrometry and co-IP analyses unveiled an interaction between FBXL4 and Drp1 to foster ubiquitination and degradation of Drp1. Truncated mutants of FBXL4 (Delta-Fbox) disengaged interaction between FBXL4 and Drp1. Metabolomic and proteomics findings identified deranged fatty acid and glucose metabolism in HFpEF patients and mice. A cellular model was established with concurrent exposure of high glucose and palmitic acid as a 'double-damage' insult to mimic diastolic anomalies in HFpEF. Transfection of FBXL4 mitigated 'double-damage'-induced cardiomyocyte diastolic dysfunction and mitochondrial injury, the effects were abolished and mimicked by Drp1 knock-in and knock-out, respectively. HFpEF downregulated sarco(endo)plasmic reticulum (SR) Ca2+ uptake protein SERCA2a while upregulating phospholamban, RYR1, IP3R1, IP3R3 and Na+-Ca2+ exchanger with unaltered SR Ca2+ load. FBXL4 ablated 'two-hit' or 'double-damage'-induced changes in SERCA2a, phospholamban and mitochondrial injury. CONCLUSION FBXL4 rescued against HFpEF-induced cardiac remodeling, diastolic dysfunction, and mitochondrial injury through reverting hyperactivation of Drp1-mediated mitochondrial fission, underscoring the therapeutic promises of FBXL4 in HFpEF.
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Affiliation(s)
- Miyesaier Abudureyimu
- Cardiovascular Department, Shanghai Xuhui Central Hospital, Fudan University, Shanghai, 200031, China; National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China
| | - Xuanming Luo
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of General Surgery, Shanghai Xuhui Central Hospital, Fudan University, Shanghai, 200031, China
| | - Lingling Jiang
- Cardiovascular Department, Shanghai Xuhui Central Hospital, Fudan University, Shanghai, 200031, China; National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China
| | - Xuejuan Jin
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, National Health Commission, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, Chinese Academy of Medical Sciences, Shanghai, 200032, China
| | - Cuizhen Pan
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, National Health Commission, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, Chinese Academy of Medical Sciences, Shanghai, 200032, China
| | - Wei Yu
- Xianning Medical College, Hubei University of Science and Technology, Xianning, 437100, China
| | - Junbo Ge
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, National Health Commission, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, Chinese Academy of Medical Sciences, Shanghai, 200032, China
| | - Yingmei Zhang
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, National Health Commission, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, Chinese Academy of Medical Sciences, Shanghai, 200032, China
| | - Jun Ren
- National Clinical Research Center for Interventional Medicine, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, National Health Commission, Shanghai, 200032, China; Key Laboratory of Viral Heart Diseases, Chinese Academy of Medical Sciences, Shanghai, 200032, China.
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Fan RZ, Sportelli C, Lai Y, Salehe SS, Pinnell JR, Brown HJ, Richardson JR, Luo S, Tieu K. A partial Drp1 knockout improves autophagy flux independent of mitochondrial function. Mol Neurodegener 2024; 19:26. [PMID: 38504290 PMCID: PMC10953112 DOI: 10.1186/s13024-024-00708-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 02/07/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND Dynamin-related protein 1 (Drp1) plays a critical role in mitochondrial dynamics. Partial inhibition of this protein is protective in experimental models of neurological disorders such as Parkinson's disease and Alzheimer's disease. The protective mechanism has been attributed primarily to improved mitochondrial function. However, the observations that Drp1 inhibition reduces protein aggregation in such neurological disorders suggest the involvement of autophagy. To investigate this potential novel protective mechanism of Drp1 inhibition, a model with impaired autophagy without mitochondrial involvement is needed. METHODS We characterized the effects of manganese (Mn), which causes parkinsonian-like symptoms in humans, on autophagy and mitochondria by performing dose-response studies in two cell culture models (stable autophagy HeLa reporter cells and N27 rat immortalized dopamine neuronal cells). Mitochondrial function was assessed using the Seahorse Flux Analyzer. Autophagy flux was monitored by quantifying the number of autophagosomes and autolysosomes, as well as the levels of other autophagy proteins. To strengthen the in vitro data, multiple mouse models (autophagy reporter mice and mutant Drp1+/- mice and their wild-type littermates) were orally treated with a low chronic Mn regimen that was previously reported to increase α-synuclein aggregation and transmission via exosomes. RNAseq, laser captured microdissection, immunofluorescence, immunoblotting, stereological cell counting, and behavioural studies were used. RESULTS IN VITRO: data demonstrate that at low non-toxic concentrations, Mn impaired autophagy flux but not mitochondrial function and morphology. In the mouse midbrain, RNAseq data further confirmed autophagy pathways were dysregulated but not mitochondrial related genes. Additionally, Mn selectively impaired autophagy in the nigral dopamine neurons but not the nearby nigral GABA neurons. In cells with a partial Drp1-knockdown and Drp1+/- mice, Mn induced autophagic impairment was significantly prevented. Consistent with these observations, Mn increased the levels of proteinase-K resistant α-synuclein and Drp1-knockdown protected against this pathology. CONCLUSIONS This study demonstrates that improved autophagy flux is a separate mechanism conferred by Drp1 inhibition independent of its role in mitochondrial fission. Given that impaired autophagy and mitochondrial dysfunction are two prominent features of neurodegenerative diseases, the combined protective mechanisms targeting these two pathways conferred by Drp1 inhibition make this protein an attractive therapeutic target.
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Affiliation(s)
- Rebecca Z Fan
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Carolina Sportelli
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Yanhao Lai
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Said S Salehe
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Jennifer R Pinnell
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Harry J Brown
- Department of Environmental Health Sciences, Florida International University, Miami, USA
- Biomolecular Sciences Institute, Florida International University, Miami, USA
| | - Jason R Richardson
- Department of Environmental Health Sciences, Florida International University, Miami, USA
| | - Shouqing Luo
- Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
| | - Kim Tieu
- Department of Environmental Health Sciences, Florida International University, Miami, USA.
- Biomolecular Sciences Institute, Florida International University, Miami, USA.
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Chen CW, Su C, Huang CY, Huang XR, Cuili X, Chao T, Fan CH, Ting CW, Tsai YW, Yang KC, Yeh TY, Hsieh ST, Chen YJ, Feng Y, Hunter T, Chang ZF. NME3 is a gatekeeper for DRP1-dependent mitophagy in hypoxia. Nat Commun 2024; 15:2264. [PMID: 38480688 PMCID: PMC10938004 DOI: 10.1038/s41467-024-46385-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 02/23/2024] [Indexed: 03/17/2024] Open
Abstract
NME3 is a member of the nucleoside diphosphate kinase (NDPK) family localized on the mitochondrial outer membrane (MOM). Here, we report a role of NME3 in hypoxia-induced mitophagy dependent on its active site phosphohistidine but not the NDPK function. Mice carrying a knock-in mutation in the Nme3 gene disrupting NME3 active site histidine phosphorylation are vulnerable to ischemia/reperfusion-induced infarction and develop abnormalities in cerebellar function. Our mechanistic analysis reveals that hypoxia-induced phosphatidic acid (PA) on mitochondria is essential for mitophagy and the interaction of DRP1 with NME3. The PA binding function of MOM-localized NME3 is required for hypoxia-induced mitophagy. Further investigation demonstrates that the interaction with active NME3 prevents DRP1 susceptibility to MUL1-mediated ubiquitination, thereby allowing a sufficient amount of active DRP1 to mediate mitophagy. Furthermore, MUL1 overexpression suppresses hypoxia-induced mitophagy, which is reversed by co-expression of ubiquitin-resistant DRP1 mutant or histidine phosphorylatable NME3. Thus, the site-specific interaction with active NME3 provides DRP1 a microenvironment for stabilization to proceed the segregation process in mitophagy.
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Affiliation(s)
- Chih-Wei Chen
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Chi Su
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Chang-Yu Huang
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Xuan-Rong Huang
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Xiaojing Cuili
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Tung Chao
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Chun-Hsiang Fan
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Cheng-Wei Ting
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Yi-Wei Tsai
- Institute of Pharmacology, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
- Department of Medical Research, National Taiwan University Hospital, 10002, Taipei, Taiwan
| | - Kai-Chien Yang
- Institute of Pharmacology, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Ti-Yen Yeh
- Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Sung-Tsang Hsieh
- Institute of Anatomy and Cell Biology, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan
| | - Yi-Ju Chen
- Institute of Chemistry, Academia Sinica, 11529, Taipei, Taiwan
| | - Yuxi Feng
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, 68167, Mannheim, Germany
| | - Tony Hunter
- Molecular and Cell Biology Laboratory, Salk Institute, La Jolla, CA, 92037-1002, USA
| | - Zee-Fen Chang
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan.
- Center of Precision Medicine, College of Medicine, National Taiwan University, 10002, Taipei, Taiwan.
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Gamal Sherif S, Tarek M, Gamal Sabry Y, Hassan Abou Ghalia A. Effect of apigenin on dynamin-related protein 1 in type 1 diabetic rats with cardiovascular complications. Gene 2024; 898:148107. [PMID: 38141690 DOI: 10.1016/j.gene.2023.148107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 12/02/2023] [Accepted: 12/20/2023] [Indexed: 12/25/2023]
Abstract
BACKGROUND AND OBJECTIVE Cardiovascular complications cause increased mortality rates among diabetics. The molecular mechanisms of aberrant mitochondrial dynamics in diabetes mellitus (DM) are not fully understood. Dynamin-related protein 1 (Drp1) is thought to be a major regulator of mitochondrial fission. There is lack of studies that examined the relationship between apigenin and Drp1 expression in DM. Thus, the current study aimed to explore the expression of Drp1 in diabetic rats with cardiovascular complications, as well as to appraise the role of apigenin in modulating this expression. METHODS Twenty-eight adult male albino Wister rats were randomly and equally allocated into four groups: naive, streptozotocin-induced type 1 diabetic control and two apigenin-injected diabetic groups (early and late). Body weight, heart weight, blood pressure and ECG were recorded. Evaluation of blood glucose level, lipid profile and cardiac functions were measured. Determination of Drp1 mRNA expression, and histological examination of cardiac tissues from the four groups were performed. RESULTS Diabetic control rats developed decrease of body weight, increase of blood pressure, deterioration of the normal ECG pattern and upregulation of Drp1 mRNA expression in cardiac tissues. There was a significant correlation between the relative expression of Drp1 and all examined parameters. Apigenin-injection improved fasting blood glucose, lipid profile and cardiac function indicators (i.e., ECG parameters, CK-MB and troponin) as well as the cardiac histological structure. The decrease of Drp1 expression was more evident with early than with late apigenin-injection, however, without statistical significance. CONCLUSIONS Increased level of Drp1 expression in diabetic rats may be involved in the pathogenesis of diabetic cardiovascular complications. The changes that occurred in response to apigenin injection highlight its potential ameliorative effect on the diabetic cardiovascular complications and pave the route for further investigations.
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Affiliation(s)
- Sara Gamal Sherif
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Egypt.
| | - Marwa Tarek
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Egypt.
| | | | - Azza Hassan Abou Ghalia
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Egypt.
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10
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Das P, Chakrabarti O. ISGylation of DRP1 closely balances other post-translational modifications to mediate mitochondrial fission. Cell Death Dis 2024; 15:184. [PMID: 38431611 PMCID: PMC10908869 DOI: 10.1038/s41419-024-06543-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 02/04/2024] [Accepted: 02/06/2024] [Indexed: 03/05/2024]
Abstract
Dynamin related protein 1 (DRP1), a pivotal mitochondrial fission protein, is post-translationally modified by multiple mechanisms. Here we identify a new post-translational modification of DRP1 by the ubiquitin-like protein, interferon-stimulated gene 15 (ISG15). DRP1 ISGylation is mediated by ISG15 E3 ligase, HERC5; this promotes mitochondrial fission. DeISGylation of DRP1 however leads to hyperfusion. Heterologous expression of SARS-CoV2 PLpro, a deISGylating enzyme, results in similar mitochondrial filamentation, significant decrease in total DRP1 protein levels and efflux of mtDNA. We report that deISGylated DRP1 gets ubiquitylated and degraded by TRIM25, instead of PARKIN and MITOL. While the cytosolic pool of DRP1 is primarily ISGylated, both mitochondrial and cytosolic fractions may be ubiquitylated. It is known that phosphorylation of DRP1 at S616 residue regulates its mitochondrial localisation; we show that ISGylation of phospho-DRP1 (S616) renders fission competence at mitochondria. This is significant because DRP1 ISGylation affects its functionality and mitochondrial dynamics in Alzheimer's disease pathophysiology.
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Affiliation(s)
- Palamou Das
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India
- Homi Bhabha National Institute, Mumbai, India
| | - Oishee Chakrabarti
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India.
- Homi Bhabha National Institute, Mumbai, India.
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11
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Shi Y, Zhang K, Dong G, Pan H, Chen B, Wang A, Niu S, Wang X, Zhang Z. Dystonia, spastic tetraplegia, and ataxia due to a novel mutation in the dynamin domain of OPA1. Ann Clin Transl Neurol 2024; 11:800-805. [PMID: 38148580 DOI: 10.1002/acn3.51981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 11/09/2023] [Accepted: 12/07/2023] [Indexed: 12/28/2023] Open
Abstract
Movement disorders manifest in various hereditary neurodegenerative diseases. We reported a young man who presented with progressive upper limb dystonia, spastic tetraplegia, and ataxia. Whole-exome sequencing (WES) revealed a novel variant, c.2357A > G, in the dynamin domain of OPA1. No mtDNA deletion was detected in muscle by long-range PCR. Atrophy and decreased glucose metabolism of the basal ganglia were discovered. Decreased mtDNA copy number, fragmented mitochondria, slightly impaired oxidative phosphorylation, and increased autophagy were detected in mutant fibroblasts. Evident oxidative phosphorylation impairment and mtDNA deletions were not involved in the pathogenicity of this mutation unlike mutations in the GTPase domain of OPA1.
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Affiliation(s)
- YuZhi Shi
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Kang Zhang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - GeHong Dong
- Department of Pathology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Hua Pan
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Disease, Beijing, China
| | - Bin Chen
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - An Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - SongTao Niu
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - XinGao Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - ZaiQiang Zhang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
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12
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Uttekar B, Verma RK, Tomer D, Rikhy R. Mitochondrial morphology dynamics and ROS regulate apical polarity and differentiation in Drosophila follicle cells. Development 2024; 151:dev201732. [PMID: 38345270 DOI: 10.1242/dev.201732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 01/23/2024] [Indexed: 03/01/2024]
Abstract
Mitochondrial morphology dynamics regulate signaling pathways during epithelial cell formation and differentiation. The mitochondrial fission protein Drp1 affects the appropriate activation of EGFR and Notch signaling-driven differentiation of posterior follicle cells in Drosophila oogenesis. The mechanisms by which Drp1 regulates epithelial polarity during differentiation are not known. In this study, we show that Drp1-depleted follicle cells are constricted in early stages and present in multiple layers at later stages with decreased levels of apical polarity protein aPKC. These defects are suppressed by additional depletion of mitochondrial fusion protein Opa1. Opa1 depletion leads to mitochondrial fragmentation and increased reactive oxygen species (ROS) in follicle cells. We find that increasing ROS by depleting the ROS scavengers, mitochondrial SOD2 and catalase also leads to mitochondrial fragmentation. Further, the loss of Opa1, SOD2 and catalase partially restores the defects in epithelial polarity and aPKC, along with EGFR and Notch signaling in Drp1-depleted follicle cells. Our results show a crucial interaction between mitochondrial morphology, ROS generation and epithelial cell polarity formation during the differentiation of follicle epithelial cells in Drosophila oogenesis.
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Affiliation(s)
- Bhavin Uttekar
- Biology, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411008, India
| | - Rahul Kumar Verma
- Biology, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411008, India
| | - Darshika Tomer
- Biology, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411008, India
| | - Richa Rikhy
- Biology, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411008, India
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13
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Huang J, Zhu Y, Liu Y, Zhang R, Zhang Z, Liu J, Zhang Z, Liang Y, Ma B. The cold-inducible RNA-binding protein-Thioredoxin 1 pathway ameliorates mitochondrial dysfunction and mitochondrial dynamin-related protein 1 level in the hippocampus of aged mice with perioperative neurocognitive dysfunction. CNS Neurosci Ther 2024; 30:e14433. [PMID: 37641878 PMCID: PMC10915978 DOI: 10.1111/cns.14433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/20/2023] [Accepted: 08/15/2023] [Indexed: 08/31/2023] Open
Abstract
BACKGROUND As a multi-disease model, neuroinflammation, mitochondrial dysfunction, and oxidative stress might be involved in the pathogenic process of perioperative neurocognitive dysfunction (PND). Dynamin-related protein 1 (Drp1) could mediate mitochondrial fission and play important roles in mitochondrial dynamic homeostasis and mitochondria function. The Drp1 may be involved in PND development. The cold-inducible RNA-binding protein (Cirbp) could bind to the 3'-UTR of the thioredoxin 1 (Trx1) mRNA, control oxidative stress, and improve mitochondrial function. In this study, we hypothesized that the Cirbp-Trx1 pathway could ameliorate mitochondrial dysfunction and Drp1 levels in PND mice. METHODS Differentially expressed genes were screened using the Gene Expression Omnibus (GEO) database GSE95426 and validated using PCR. Eighteen-month-old C57BL/6 mice were subjected to tibial fracture surgery to generate a PND model. Cirbp was upregulated by hippocampal stereotaxic injections of over-Cirbp plasmid according to the manufacturer's instructions for the in vivo DNA transfection reagent. Cirbp expression was measured using western blot (WB) and immunofluorescence (IF). The Morris water maze (MWM) was used to assess cognitive function. After behavioral testing, the hippocampal tissue was extracted to examine changes in mitochondrial Drp1, mitochondrial function, neuroinflammation, and oxidative stress. RESULTS Differential gene screening showed that Cirbp expression was significantly downregulated (fold change >1.5, p = 0.003272) in the PND model. In this study, we also found that Cirbp protein levels were downregulated, accompanied by an impairment of cognition, a decrease in superoxide dismutase (SOD) activity, and an increase in malondialdehyde (MDA) content, mitochondrial Drp1 levels, neuroinflammation, and apoptosis. Cirbp overexpression increased Trx1 protein levels and reversed the damage. However, this protective effect was abolished by PX-12 treatment with a Trx1 inhibitor. CONCLUSIONS The Cirbp-Trx1 pathway may regulate mitochondrial dysfunction and mitochondrial Drp1 expression in the hippocampus of PND mice to ameliorate cognitive dysfunction.
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Affiliation(s)
- Jingyao Huang
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Yongliang Zhu
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Yongxin Liu
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Rui Zhang
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Zhenjiang Zhang
- Department of Thoracic SurgeryWeifang People's HospitalWeifangChina
| | - Jie Liu
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Zhihao Zhang
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Yingxia Liang
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
| | - Baoyu Ma
- Laboratory of Anesthesia and Critical Care Medicine in Colleges and Universities of Shandong Province, School of AnesthesiologyWeifang Medical UniversityWeifangChina
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14
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Satoh S, Miyake K, Adachi Y, Masuhiro K, Futami S, Naito Y, Shiroyama T, Koyama S, Yamaguchi Y, Konaka H, Takamatsu H, Okuzaki D, Nagatomo I, Takeda Y, Kumanogoh A. Cancer-associated SNRPD3 mutation confers resistance to hypoxia, which is attenuated by DRP1 inhibition. Biochem Biophys Res Commun 2024; 696:149511. [PMID: 38241813 DOI: 10.1016/j.bbrc.2024.149511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 12/22/2023] [Accepted: 01/09/2024] [Indexed: 01/21/2024]
Abstract
RNA splicing is a fundamental cellular mechanism performed by spliceosomes that synthesise multiple mature RNA isoforms from a single gene. The association between spliceosome abnormality and solid cancers remains largely unknown. Here, we demonstrated that Sm proteins, which are common components of the spliceosomes and constitute the Sm ring, were overexpressed in multiple cancers and their expression levels were correlated with clinical prognosis. In a pan-cancer mutational hotspot in the Sm ring at SNRPD3 G96V, we found that the G96V substitution confers resistance to hypoxia. RNA-seq detected numerous differentially spliced events between the wild-type and mutation-carrying cells cultured under hypoxia, wherein skipping exons and mutually exclusive exons were frequently observed. This was observed in DNM1L mRNA, which encodes the DRP1 protein that regulates mitochondrial fission. The mitochondria of cells carrying this mutation were excessively fragmented compared with those of wild-type cells. Furthermore, treatment with a DRP1 inhibitor (Mdivi-1) recovered the over-fragmented mitochondria, leading to the attenuation of hypoxia resistance in the mutant cells. These results propose a novel correlation between the cancer-related spliceosome abnormality and mitochondrial fission. Thus, targeting SNRPD3 G96V with a DRP1 inhibitor is a potential treatment strategy for cancers with spliceosome abnormalities.
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Affiliation(s)
- Shingo Satoh
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Kotaro Miyake
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan.
| | - Yuichi Adachi
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Kentaro Masuhiro
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Shinji Futami
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Yujiro Naito
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Takayuki Shiroyama
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Shohei Koyama
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Division of Cancer Immunology, Research Institute/Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Tokyo, Japan
| | - Yuta Yamaguchi
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Hachiro Konaka
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Internal Medicine, Nippon Life Hospital, Osaka, Japan
| | - Hyota Takamatsu
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan
| | - Daisuke Okuzaki
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Izumi Nagatomo
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Yoshito Takeda
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Atsushi Kumanogoh
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Immunopathology, World Premier International Research Center, Initiative (WPI), Immunology, Frontier Research Center (IFReC), Osaka University, Osaka, Japan; Integrated Frontier Research for Medical Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, Osaka, Japan; Center for Infectious Diseases for Education and Research (CiDER), Osaka University, Osaka, Japan; Japan Agency for Medical Research and Development - Core Research for Evolutional Science and Technology (AMED-CREST), Osaka University, Osaka, Japan; Center for Advanced Modalities and DDS (CAMaD), Osaka University, Osaka, Japan.
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15
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Zhang Z, Bie X, Chen Z, Liu J, Xie Z, Li X, Xiao M, Zhang Q, Zhang Y, Yang Y, Li D. A novel variant of DNM1L expanding the clinical phenotypic spectrum: a case report and literature review. BMC Pediatr 2024; 24:104. [PMID: 38341530 PMCID: PMC10858475 DOI: 10.1186/s12887-023-04442-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 11/23/2023] [Indexed: 02/12/2024] Open
Abstract
BACKGROUND Mitochondrial diseases are heterogeneous in terms of clinical manifestations and genetic characteristics. The dynamin 1-like gene (DNM1L) encodes dynamin-related protein 1 (DRP1), a member of the GTPases dynamin superfamily responsible for mitochondrial and peroxisomal fission. DNM1L variants can lead to mitochondrial fission dysfunction. CASE PRESENTATION Herein, we report a distinctive clinical phenotype associated with a novel variant of DNM1L and review the relevant literature. A 5-year-old girl presented with paroxysmal hemiplegia, astigmatism, and strabismus. Levocarnitine and coenzyme Q10 supplement showed good efficacy. Based on the patient's clinical data, trio whole-exome sequencing (trio-WES) and mtDNA sequencing were performed to identify the potential causative genes, and Sanger sequencing was used to validate the specific variation in the proband and her family members. The results showed a novel de novo heterozygous nonsense variant in exon 20 of the DNM1L gene, c.2161C>T, p.Gln721Ter, which is predicted to be a pathogenic variant according to the ACMG guidelines. The proband has a previously undescribed clinical manifestation, namely hemiparesis, which may be an additional feature of the growing phenotypic spectrum of DNM1L-related diseases. CONCLUSION Our findings elucidate a novel variant in DNM1L-related disease and reveal an expanding phenotypic spectrum associated with DNM1L variants. This report highlights the necessity of next generation sequencing for early diagnosis of patients, and that further clinical phenotypic and genotypic analysis may help to improve the understanding of DNM1L-related diseases.
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Affiliation(s)
- Zhenkun Zhang
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Xiaofan Bie
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Zhehui Chen
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Jing Liu
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Zhenhua Xie
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Xian Li
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Mengjun Xiao
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Qiang Zhang
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Yaodong Zhang
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Yanling Yang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.
| | - Dongxiao Li
- Henan Provincial Clinical Research Center for Pediatric Diseases, Henan Children's Neurodevelopment Engineering Research Center, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China.
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16
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Yan T, Chen J, Wang Y, Wang Y, Zhang Y, Zhao Y. Deficiency of aldehyde dehydrogenase 2 aggravates ethanol-induced cytotoxicity in N2a cells via CaMKII/Drp1-mediated mitophagy. Food Chem Toxicol 2023; 182:114129. [PMID: 37967785 DOI: 10.1016/j.fct.2023.114129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 10/13/2023] [Accepted: 10/24/2023] [Indexed: 11/17/2023]
Abstract
Chronic alcohol abuse causes brain damage and has been associated with an increased risk of Alzheimer's disease. The toxic metabolite of alcohol, acetaldehyde, which is converted to acetate by aldehyde dehydrogenase 2 (ALDH2), has been shown to induce excessive mitochondrial fragmentation and dysfunction leading to neurotoxicity. However, it is still unclear how alcohol affects mitochondrial function in ALDH2-deficient cells. The present study investigated the association between abnormal mitochondrial dynamics, mitophagy and cytotoxicity in ALDH2-deficient N2a cells treated with ethanol. It was found that ethanol induced dynamin-related protein 1 (Drp1)-mediated mitochondrial fragmentation and impaired mitochondrial function, causing excessive mitophagy and cytotoxicity in ALDH2-deficient N2a cells while inducing Ca2+ influx and activating Ca2+/calmodulin-dependent protein kinase II (CaMKII). Inhibition of Ca2+ overload or CaMKII activation prevented Drp1 phosphorylation and ameliorated ethanol-induced mitophagy and cytotoxicity, indicating that Ca2+-dependent CaMKII activation was critical for mediating Drp1-dependent excessive mitochondrial fission and mitophagy in ALDH2-deficient N2a cells. The results of the present study suggested that prevention of intracellular Ca2+ overload might be beneficial for preventing neurotoxicity associated with alcohol abuse in individuals with defective ALDH2.
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Affiliation(s)
- Tingting Yan
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China
| | - Jiyang Chen
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China
| | - Yalin Wang
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China
| | - Yinuo Wang
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China
| | - Yuanqingzhi Zhang
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China
| | - Yan Zhao
- Department of Bioengineering, Harbin Institute of Technology, Weihai 264209, Shandong, China.
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17
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Nolden KA, Harwig MC, Hill RB. Human Fis1 directly interacts with Drp1 in an evolutionarily conserved manner to promote mitochondrial fission. J Biol Chem 2023; 299:105380. [PMID: 37866629 PMCID: PMC10694664 DOI: 10.1016/j.jbc.2023.105380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 09/30/2023] [Accepted: 10/11/2023] [Indexed: 10/24/2023] Open
Abstract
Mitochondrial fission protein 1 (Fis1) and dynamin-related protein 1 (Drp1) are the only two proteins evolutionarily conserved for mitochondrial fission, and directly interact in Saccharomyces cerevisiae to facilitate membrane scission. However, it remains unclear if a direct interaction is conserved in higher eukaryotes as other Drp1 recruiters, not present in yeast, are known. Using NMR, differential scanning fluorimetry, and microscale thermophoresis, we determined that human Fis1 directly interacts with human Drp1 (KD = 12-68 μM), and appears to prevent Drp1 assembly, but not GTP hydrolysis. Similar to yeast, the Fis1-Drp1 interaction appears governed by two structural features of Fis1: its N-terminal arm and a conserved surface. Alanine scanning mutagenesis of the arm identified both loss-of-function and gain-of-function alleles with mitochondrial morphologies ranging from highly elongated (N6A) to highly fragmented (E7A), demonstrating a profound ability of Fis1 to govern morphology in human cells. An integrated analysis identified a conserved Fis1 residue, Y76, that upon substitution to alanine, but not phenylalanine, also caused highly fragmented mitochondria. The similar phenotypic effects of the E7A and Y76A substitutions, along with NMR data, support that intramolecular interactions occur between the arm and a conserved surface on Fis1 to promote Drp1-mediated fission as in S. cerevisiae. These findings indicate that some aspects of Drp1-mediated fission in humans derive from direct Fis1-Drp1 interactions that are conserved across eukaryotes.
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Affiliation(s)
- Kelsey A Nolden
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Megan C Harwig
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - R Blake Hill
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
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18
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Dong WT, Long LH, Deng Q, Liu D, Wang JL, Wang F, Chen JG. Mitochondrial fission drives neuronal metabolic burden to promote stress susceptibility in male mice. Nat Metab 2023; 5:2220-2236. [PMID: 37985735 DOI: 10.1038/s42255-023-00924-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 10/09/2023] [Indexed: 11/22/2023]
Abstract
Neurons are particularly susceptible to energy fluctuations in response to stress. Mitochondrial fission is highly regulated to generate ATP via oxidative phosphorylation; however, the role of a regulator of mitochondrial fission in neuronal energy metabolism and synaptic efficacy under chronic stress remains elusive. Here, we show that chronic stress promotes mitochondrial fission in the medial prefrontal cortex via activating dynamin-related protein 1 (Drp1), resulting in mitochondrial dysfunction in male mice. Both pharmacological inhibition and genetic reduction of Drp1 ameliorates the deficit of excitatory synaptic transmission and stress-related depressive-like behavior. In addition, enhancing Drp1 fission promotes stress susceptibility, which is alleviated by coenzyme Q10, which potentiates mitochondrial ATP production. Together, our findings unmask the role of Drp1-dependent mitochondrial fission in the deficits of neuronal metabolic burden and depressive-like behavior and provides medication basis for metabolism-related emotional disorders.
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Affiliation(s)
- Wan-Ting Dong
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li-Hong Long
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China
- The Research Center for Depression, Tongji Medical College, Huazhong University of Science, Wuhan, China
- The Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan, China
| | - Qiao Deng
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Duo Liu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jia-Lin Wang
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fang Wang
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
- The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.
- The Research Center for Depression, Tongji Medical College, Huazhong University of Science, Wuhan, China.
- The Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan, China.
| | - Jian-Guo Chen
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
- The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.
- The Research Center for Depression, Tongji Medical College, Huazhong University of Science, Wuhan, China.
- The Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan, China.
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19
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Huang Y, Xiong K, Wang A, Wang Z, Cui Q, Xie H, Yang T, Fan X, Jiang W, Tan X, Huang Q. Cold stress causes liver damage by inducing ferroptosis through the p38 MAPK/Drp1 pathway. Cryobiology 2023; 113:104563. [PMID: 37532122 DOI: 10.1016/j.cryobiol.2023.104563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 06/29/2023] [Accepted: 07/29/2023] [Indexed: 08/04/2023]
Abstract
Acute extreme cold exposure impairs human health and even causes hypothermia which threatens human life. Liver, as a hub in metabolism and thermogenesis, is vital for cold acclimatization. Although accumulating evidence has suggested that cold exposure can cause liver damage, the underlying mechanisms remain poorly understood. This study investigated the role and underlying mechanisms of ferroptosis in cold stress-induced liver damage. To evaluate the role of ferroptosis in cold stress-induced liver damage, rats were pretreated with ferroptosis inhibitor liproxstatin-1 (Lip-1) before exposed to -10 °C for 8 h. Core body temperature was recorded. The levels of ferroptosis-related indicators were examined with the corresponding assay kits or by western blotting. Hepatic pathological changes were analyzed by hematoxylin-eosin staining and ultrastructural observation. Serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were measured to assess liver function. Rats were also pretreated with p38 mitogen-activated protein kinase (MAPK) inhibitor SB203580 or Dynamin-related protein 1 (Drp1) inhibitor Mdivi-1 to determine the underlying mechanisms. We found that Lip-1 inhibited ferroptosis, attenuated hepatic pathological damages and blocked the increased ALT and AST levels in cold-exposed rats. Moreover, Mdivi-1 inhibited mitochondrial fission and suppressed ferroptosis. Furthermore, SB203580 and Mdivi-1 administration alleviated cold stress-induced liver injury. Our results suggested that cold stress caused liver damage partially by inducing ferroptosis through the p38 MAPK/Drp1 pathway. These findings might provide an effective preventive and therapeutic target for cold stress-induced liver injury.
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Affiliation(s)
- Yujie Huang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China.
| | - Kun Xiong
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Aiping Wang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Zejun Wang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Qi Cui
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Hongchen Xie
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Tian Yang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Xu Fan
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Wenjun Jiang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China
| | - Xiaoling Tan
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China.
| | - Qingyuan Huang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Shapingba District, Chongqing, 400038, PR China; Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, PR China; Key Laboratory of High Altitude Medicine, PLA, Chongqing, PR China.
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20
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Ihenacho UK, Toro R, Mansour RH, Hill RB. A conserved, noncanonical insert in FIS1 mediates TBC1D15 and DRP1 recruitment for mitochondrial fission. J Biol Chem 2023; 299:105303. [PMID: 37777154 PMCID: PMC10641528 DOI: 10.1016/j.jbc.2023.105303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 08/22/2023] [Accepted: 09/04/2023] [Indexed: 10/02/2023] Open
Abstract
Mitochondrial fission protein 1 (FIS1) is conserved in all eukaryotes, yet its function in metazoans is thought divergent. Structure-based sequence alignments of FIS1 revealed a conserved, but noncanonical, three-residue insert in its first tetratricopeptide repeat (TPR) suggesting a conserved function. In vertebrates, this insert is serine (S45), lysine (K46), and tyrosine (Y47). To determine the biological role of the "SKY insert," three variants were tested in HCT116 cells for altered mitochondrial morphology and recruitment of fission mechanoenzyme DRP1 and mitophagic adaptor TBC1D15. Similar to ectopically expressed wildtype FIS1, substitution of the SKY insert with alanine (AAA) fragmented mitochondria into perinuclear clumps associated with increased mitochondrial DRP1. In contrast, deletion variants (either ∆SKY or ∆SKYD49G) elongated mitochondrial networks with reduced mitochondrial recruitment of DRP1, despite DRP1 coimmunoprecipitates being highly enriched with ΔSKY variants. Ectopic wildtype FIS1 drove co-expressed YFP-TBC1D15 entirely from the cytoplasm to mitochondria as punctate structures concomitant with enhanced mitochondrial DRP1 recruitment. YFP-TBC1D15 co-expressed with the AAA variant further enhanced mitochondrial DRP1 recruitment, indicating a gain of function. In contrast, YFP-TBC1D15 co-expressed with deletion variants impaired mitochondrial DRP1 and YFP-TBC1D15 recruitment; however, mitochondrial fragmentation was restored. These phenotypes were not due to misfolding or poor expression of FIS1 variants, although ∆SKYD49G induced conformational heterogeneity that is lost upon deletion of the regulatory Fis1 arm, indicating SKY-arm interactions. Collectively, these results support a unifying model whereby FIS1 activity is effectively governed by intramolecular interactions between its regulatory arm and a noncanonical TPR insert that is conserved across eukaryotes.
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Affiliation(s)
- Ugochukwu K Ihenacho
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Rafael Toro
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Rana H Mansour
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - R Blake Hill
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
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21
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Wu NS, Ma IC, Lin YF, Ko HJ, Loh JK, Hong YR. The mystery of phospho-Drp1 with four adaptors in cell cycle: when mitochondrial fission couples to cell fate decisions. Cell Cycle 2023; 22:2485-2503. [PMID: 38053243 PMCID: PMC10802209 DOI: 10.1080/15384101.2023.2289753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/26/2023] [Indexed: 12/07/2023] Open
Abstract
Recent study had deepened our knowledge of the mitochondrial dynamics to classify mitochondrial fission into two types. To further clarify the relationship between the two distinct fission machinery and the four major adaptors of Drp1, we propose a model of mechanism elucidating the multiple functions of phospho-Drp1 with its adaptors during cell cycle and providing in-depth insights into the molecular basis and evolutionary implications in depth. The model highlights not only the clustering characteristics of different phospho-Drp1 with respective subsets of mitochondrial pro-fission adaptors but also the correlation, crosstalk and shifting between different clustering of phosphorylated Drp1-adaptors during different key fission situations. Particularly, phospho-Drp1 (Ser616) couples with Mff/MiD51 to exert mitochondrial division and phospho-Drp1 (Ser637) couples with MiD49/Fis1 to execute mitophagy in M-phase. We then apply the model to address the relationship of mitochondrial dynamics to Parkinson's disease (PD) and carcinogenesis. Our proposed model is indeed compatible with current research results and pathological observations, providing promising directions for future treatment design.
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Affiliation(s)
- Nian-Siou Wu
- Department of Education, Hsin-Chu Branch, National Taiwan University Hospital, Hsinchu, Taiwan
- PhD Program in Molecular Medicine, National Tsing Hua University, Hsinchu, Taiwan
| | - I-Chu Ma
- Division of Neurology, China Medical University Hospital, Taichung, Taiwan
| | - Yi-Fan Lin
- Department of Education, National Taiwan University Hospital, Taipei, Taiwan
| | - Huey-Jiun Ko
- Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Joon-Khim Loh
- Department of Neurosurgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Yi-Ren Hong
- Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institutes of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
- Neuroscience Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
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22
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Kugler BA, Lourie J, Berger N, Lin N, Nguyen P, DosSantos E, Ali A, Sesay A, Rosen HG, Kalemba B, Hendricks GM, Houmard JA, Sesaki H, Gona P, You T, Yan Z, Zou K. Partial skeletal muscle-specific Drp1 knockout enhances insulin sensitivity in diet-induced obese mice, but not in lean mice. Mol Metab 2023; 77:101802. [PMID: 37690520 PMCID: PMC10511484 DOI: 10.1016/j.molmet.2023.101802] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 08/22/2023] [Accepted: 09/05/2023] [Indexed: 09/12/2023] Open
Abstract
OBJECTIVE Dynamin-related protein 1 (Drp1) is the key regulator of mitochondrial fission. We and others have reported a strong correlation between enhanced Drp1 activity and impaired skeletal muscle insulin sensitivity. This study aimed to determine whether Drp1 directly regulates skeletal muscle insulin sensitivity and whole-body glucose homeostasis. METHODS We employed tamoxifen-inducible skeletal muscle-specific heterozygous Drp1 knockout mice (mDrp1+/-). Male mDrp1+/- and wildtype (WT) mice were fed with either a high-fat diet (HFD) or low-fat diet (LFD) for four weeks, followed by tamoxifen injections for five consecutive days, and remained on their respective diet for another four weeks. In addition, we used primary human skeletal muscle cells (HSkMC) from lean, insulin-sensitive, and severely obese, insulin-resistant humans and transfected the cells with either a Drp1 shRNA (shDrp1) or scramble shRNA construct. Skeletal muscle and whole-body insulin sensitivity, skeletal muscle insulin signaling, mitochondrial network morphology, respiration, and H2O2 production were measured. RESULTS Partial deletion of the Drp1 gene in skeletal muscle led to improved whole-body glucose tolerance and insulin sensitivity (P < 0.05) in diet-induced obese, insulin-resistant mice but not in lean mice. Analyses of mitochondrial structure and function revealed that the partial deletion of the Drp1 gene restored mitochondrial dynamics, improved mitochondrial morphology, and reduced mitochondrial Complex I- and II-derived H2O2 (P < 0.05) under the condition of diet-induced obesity. In addition, partial deletion of Drp1 in skeletal muscle resulted in elevated circulating FGF21 (P < 0.05) and in a trend towards increase of FGF21 expression in skeletal muscle tissue (P = 0.095). In primary myotubes derived from severely obese, insulin-resistant humans, ShRNA-induced-knockdown of Drp1 resulted in enhanced insulin signaling, insulin-stimulated glucose uptake and reduced cellular reactive oxygen species (ROS) content compared to the shScramble-treated myotubes from the same donors (P < 0.05). CONCLUSION These data demonstrate that partial loss of skeletal muscle-specific Drp1 expression is sufficient to improve whole-body glucose homeostasis and insulin sensitivity under obese, insulin-resistant conditions, which may be, at least in part, due to reduced mitochondrial H2O2 production. In addition, our findings revealed divergent effects of Drp1 on whole-body metabolism under lean healthy or obese insulin-resistant conditions in mice.
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Affiliation(s)
- Benjamin A Kugler
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Jared Lourie
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Nicolas Berger
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Nana Lin
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Paul Nguyen
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Edzana DosSantos
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Abir Ali
- Department of Biology, University of Massachusetts Boston, Boston, MA, USA
| | - Amira Sesay
- Department of Biology, University of Massachusetts Boston, Boston, MA, USA
| | - H Grace Rosen
- Department of Biology, University of Massachusetts Boston, Boston, MA, USA
| | - Baby Kalemba
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Gregory M Hendricks
- Department of Radiology, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - Joseph A Houmard
- Department of Kinesiology, East Carolina University, Greenville, NC, USA; Human Performance Laboratory, East Carolina University, Greenville, NC, USA
| | - Hiromi Sesaki
- Department of Cell Biology, Johns Hopkins University, Baltimore, MD, USA
| | - Philimon Gona
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Tongjian You
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Zhen Yan
- Fralin Biomedical Research Institute Center for Exercise Medicine Research, Virginia Tech Carilion, Roanoke, VA, USA; Department of Human Nutrition, Foods, and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Kai Zou
- Department of Exercise and Health Sciences, Robert and Donna Manning College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, USA.
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23
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Connor OM, Matta SK, Friedman JR. Completion of mitochondrial division requires the intermembrane space protein Mdi1/Atg44. J Cell Biol 2023; 222:e202303147. [PMID: 37540145 PMCID: PMC10403340 DOI: 10.1083/jcb.202303147] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 07/05/2023] [Accepted: 07/17/2023] [Indexed: 08/05/2023] Open
Abstract
Mitochondria are highly dynamic double membrane-bound organelles that maintain their shape in part through fission and fusion. Mitochondrial fission is performed by a dynamin-related protein, Dnm1 (Drp1 in humans), that constricts and divides the mitochondria in a GTP hydrolysis-dependent manner. However, it is unclear whether factors inside mitochondria help coordinate the process and if Dnm1/Drp1 activity is sufficient to complete the fission of both mitochondrial membranes. Here, we identify an intermembrane space protein required for mitochondrial fission in yeast, which we propose to name Mdi1 (also named Atg44). Loss of Mdi1 causes mitochondrial hyperfusion due to defects in fission, but not the lack of Dnm1 recruitment to mitochondria. Mdi1 is conserved in fungal species, and its homologs contain an amphipathic α-helix, mutations of which disrupt mitochondrial morphology. One model is that Mdi1 distorts mitochondrial membranes to enable Dnm1 to robustly complete fission. Our work reveals that Dnm1 cannot efficiently divide mitochondria without the coordinated function of Mdi1 inside mitochondria.
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Affiliation(s)
- Olivia M. Connor
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Srujan K. Matta
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jonathan R. Friedman
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
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24
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Seo BJ, Na SB, Choi J, Ahn B, Habib O, Park C, Hong K, Do JT. Metabolic and cell cycle shift induced by the deletion of Dnm1l attenuates the dissolution of pluripotency in mouse embryonic stem cells. Cell Mol Life Sci 2023; 80:302. [PMID: 37747543 DOI: 10.1007/s00018-023-04962-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 09/12/2023] [Accepted: 09/12/2023] [Indexed: 09/26/2023]
Abstract
Mitochondria are versatile organelles that continuously change their morphology via fission and fusion. However, the detailed functions of mitochondrial dynamics-related genes in pluripotent stem cells remain largely unclear. Here, we aimed to determine the effects on energy metabolism and differentiation ability of mouse embryonic stem cells (ESCs) following deletion of the mitochondrial fission-related gene Dnml1. Resultant Dnm1l-/- ESCs maintained major pluripotency characteristics. However, Dnm1l-/- ESCs showed several phenotypic changes, including the inhibition of differentiation ability (dissolution of pluripotency). Notably, Dnm1l-/- ESCs maintained the expression of the pluripotency marker Oct4 and undifferentiated colony types upon differentiation induction. RNA sequencing analysis revealed that the most frequently differentially expressed genes were enriched in the glutathione metabolic pathway. Our data suggested that differentiation inhibition of Dnm1l-/- ESCs was primarily due to metabolic shift from glycolysis to OXPHOS, G2/M phase retardation, and high level of Nanog and 2-cell-specific gene expression.
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Affiliation(s)
- Bong Jong Seo
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Seung Bin Na
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Joonhyuk Choi
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Byeongyong Ahn
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Omer Habib
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea
| | - Chankyu Park
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Kwonho Hong
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Jeong Tae Do
- Department of Stem Cell and Regenerative Biotechnology, Konkuk Institute of Technology, Konkuk University, Seoul, 05029, Republic of Korea.
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25
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Bang BR, Miki H, Kang YJ. Mitochondrial PGAM5-Drp1 signaling regulates the metabolic reprogramming of macrophages and regulates the induction of inflammatory responses. Front Immunol 2023; 14:1243548. [PMID: 37771598 PMCID: PMC10523165 DOI: 10.3389/fimmu.2023.1243548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 08/28/2023] [Indexed: 09/30/2023] Open
Abstract
Macrophages play a critical role in the regulation of inflammation and tissue homeostasis. In addition to their vital functions for cell survival and physiology, mitochondria play a crucial role in innate immunity as a platform for the induction of inflammatory responses by regulating cell signaling and dynamics. Dynamin-related protein 1 (Drp1) plays a role in the induction of inflammatory responses and the subsequent development of various diseases. PGAM5 (phosphoglycerate mutase member 5) is a mitochondrial outer membrane phosphatase that dephosphorylates its substrate, Drp1. Previous studies showed that PGAM5 regulates the phosphorylation of Drp1 for the activation of NKT cells and T cells. However, it is not clear how PGAM5 regulates Drp1 activity for the induction of inflammation in macrophages. Here, we demonstrate that PGAM5 activity regulates the dephosphorylation of Drp1 in macrophages, leading to the induction of proinflammatory responses in macrophages. In TLR signaling, PGAM5 regulates the expression and production of inflammatory cytokines by regulating the activation of downstream signaling pathways, including the NF-κB and MAPK pathways. Upon LPS stimulation, PGAM5 interacts with Drp1 to form a complex, leading to the production of mtROS. Furthermore, PGAM5-Drp1 signaling promotes the polarization of macrophages toward a proinflammatory phenotype. Our study further demonstrates that PGAM5-Drp1 signaling promotes metabolic reprogramming by upregulating glycolysis and mitochondrial metabolism in macrophages. Altogether, PGAM5 signaling is a linker between alterations in Drp1-mediated mitochondrial dynamics and inflammatory responses in macrophages and may be a target for the treatment of inflammatory diseases.
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Affiliation(s)
- Bo-Ram Bang
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, United States
| | - Haruka Miki
- Division of Immune Regulation, La Jolla Institute for Immunology, La Jolla, CA, United States
- Department of Rheumatology, Institute of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Young Jun Kang
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, United States
- Molecular Medicine Research Institute, Sunnyvale, CA, United States
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26
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Wang J, Chen A, Xue Z, Liu J, He Y, Liu G, Zhao Z, Li W, Zhang Q, Chen A, Wang J, Li X, Wang X, Huang B. BCL2L13 promotes mitophagy through DNM1L-mediated mitochondrial fission in glioblastoma. Cell Death Dis 2023; 14:585. [PMID: 37660127 PMCID: PMC10475114 DOI: 10.1038/s41419-023-06112-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 08/18/2023] [Accepted: 08/24/2023] [Indexed: 09/04/2023]
Abstract
There is an urgent need for novel diagnostic and therapeutic strategies for patients with Glioblastoma multiforme (GBM). Previous studies have shown that BCL2 like 13 (BCL2L13) is a member of the BCL2 family regulating cell growth and apoptosis in different types of tumors. However, the clinical significance, biological role, and potential mechanism in GBM remain unexplored. In this study, we showed that BCL2L13 expression is significantly upregulated in GBM cell lines and clinical GBM tissue samples. Mechanistically, BCL2L13 targeted DNM1L at the Ser616 site, leading to mitochondrial fission and high mitophagy flux. Functionally, these alterations significantly promoted the proliferation and invasion of GBM cells both in vitro and in vivo. Overall, our findings demonstrated that BCL2L13 plays a significant role in promoting mitophagy via DNM1L-mediated mitochondrial fission in GBM. Therefore, the regulation and biological function of BCL2L13 render it a candidate molecular target for treating GBM.
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Affiliation(s)
- Jiwei Wang
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Anbin Chen
- Department of Neurosurgery, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, 200092, Shanghai, China
| | - Zhiwei Xue
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Junzhi Liu
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Ying He
- Laboratory of Basic Medical Sciences, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Guowei Liu
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Zhimin Zhao
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Wenjie Li
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Qing Zhang
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Anjing Chen
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Jian Wang
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Xingang Li
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China
| | - Xinyu Wang
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China.
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China.
| | - Bin Huang
- Department of Neurosurgery, Qilu Hospital, Cheeloo College of Medicine and Institute of Brain and Brain-Inspired Science, Shandong University, 250012, Jinan, China.
- Jinan Microecological Biomedicine Shandong Laboratory and Shandong Key Laboratory of Brain Function Remodeling, 250117, Jinan, China.
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Khurana H, Pucadyil TJ. "Gearing" up for dynamin-catalyzed membrane fission. Curr Opin Cell Biol 2023; 83:102204. [PMID: 37451176 DOI: 10.1016/j.ceb.2023.102204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 07/18/2023]
Abstract
Endocytic dynamins self-assemble into helical scaffolds and utilize energy from GTP hydrolysis to constrict and sever tubular membranous necks of budded endocytic intermediates. They bind the membrane using a pleckstrin-homology domain (PHD). The PHD is characterized by four unstructured loops, two of which partially insert into the membrane. Recent studies reveal that loop insertion lowers the bending rigidity of the membrane and that mutations in these two loops produce separable and opposite effects on the efficiency of dynamin-catalyzed membrane fission. Here, we review the current understanding of dynamin-catalyzed membrane fission and attempt to reconcile contrasting notions that have emerged from biochemical and cellular studies evaluating the role of the PHD in this process. We propose that two membrane-inserting loops act as "gears" that define the catalytic efficiency of the dynamin helical scaffold in membrane fission.
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Affiliation(s)
- Himani Khurana
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Thomas J Pucadyil
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India.
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28
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Tong M, Mukai R, Mareedu S, Zhai P, Oka SI, Huang CY, Hsu CP, Yousufzai FAK, Fritzky L, Mizushima W, Babu GJ, Sadoshima J. Distinct Roles of DRP1 in Conventional and Alternative Mitophagy in Obesity Cardiomyopathy. Circ Res 2023; 133:6-21. [PMID: 37232152 PMCID: PMC10330464 DOI: 10.1161/circresaha.123.322512] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 05/03/2023] [Indexed: 05/27/2023]
Abstract
BACKGROUND Obesity induces cardiomyopathy characterized by hypertrophy and diastolic dysfunction. Whereas mitophagy mediated through an Atg7 (autophagy related 7)-dependent mechanism serves as an essential mechanism to maintain mitochondrial quality during the initial development of obesity cardiomyopathy, Rab9 (Ras-related protein Rab-9A)-dependent alternative mitophagy takes over the role during the chronic phase. Although it has been postulated that DRP1 (dynamin-related protein 1)-mediated mitochondrial fission and consequent separation of the damaged portions of mitochondria are essential for mitophagy, the involvement of DRP1 in mitophagy remains controversial. We investigated whether endogenous DRP1 is essential in mediating the 2 forms of mitophagy during high-fat diet (HFD)-induced obesity cardiomyopathy and, if so, what the underlying mechanisms are. METHODS Mice were fed either a normal diet or an HFD (60 kcal %fat). Mitophagy was evaluated using cardiac-specific Mito-Keima mice. The role of DRP1 was evaluated using tamoxifen-inducible cardiac-specific Drp1knockout (Drp1 MCM) mice. RESULTS Mitophagy was increased after 3 weeks of HFD consumption. The induction of mitophagy by HFD consumption was completely abolished in Drp1 MCM mouse hearts, in which both diastolic and systolic dysfunction were exacerbated. The increase in LC3 (microtubule-associated protein 1 light chain 3)-dependent general autophagy and colocalization between LC3 and mitochondrial proteins was abolished in Drp1 MCM mice. Activation of alternative mitophagy was also completely abolished in Drp1 MCM mice during the chronic phase of HFD consumption. DRP1 was phosphorylated at Ser616, localized at the mitochondria-associated membranes, and associated with Rab9 and Fis1 (fission protein 1) only during the chronic, but not acute, phase of HFD consumption. CONCLUSIONS DRP1 is an essential factor in mitochondrial quality control during obesity cardiomyopathy that controls multiple forms of mitophagy. Although DRP1 regulates conventional mitophagy through a mitochondria-associated membrane-independent mechanism during the acute phase, it acts as a component of the mitophagy machinery at the mitochondria-associated membranes in alternative mitophagy during the chronic phase of HFD consumption.
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Affiliation(s)
- Mingming Tong
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
- Equal contribution
| | - Risa Mukai
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
- Equal contribution
| | - Satvik Mareedu
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
| | - Peiyong Zhai
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
| | - Shin-ichi Oka
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
| | - Chun-Yang Huang
- Division of Cardiovascular Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang-Ming Chiao-Tung University, Taipei, Taiwan
| | - Chiao-Po Hsu
- Division of Cardiovascular Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang-Ming Chiao-Tung University, Taipei, Taiwan
| | | | - Luke Fritzky
- Core Imaging Facility, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Wataru Mizushima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
| | - Gopal J. Babu
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, USA
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29
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Fukuda T, Furukawa K, Maruyama T, Yamashita SI, Noshiro D, Song C, Ogasawara Y, Okuyama K, Alam JM, Hayatsu M, Saigusa T, Inoue K, Ikeda K, Takai A, Chen L, Lahiri V, Okada Y, Shibata S, Murata K, Klionsky DJ, Noda NN, Kanki T. The mitochondrial intermembrane space protein mitofissin drives mitochondrial fission required for mitophagy. Mol Cell 2023; 83:2045-2058.e9. [PMID: 37192628 PMCID: PMC10330776 DOI: 10.1016/j.molcel.2023.04.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 01/30/2023] [Accepted: 04/21/2023] [Indexed: 05/18/2023]
Abstract
Mitophagy plays an important role in mitochondrial homeostasis by selective degradation of mitochondria. During mitophagy, mitochondria should be fragmented to allow engulfment within autophagosomes, whose capacity is exceeded by the typical mitochondria mass. However, the known mitochondrial fission factors, dynamin-related proteins Dnm1 in yeasts and DNM1L/Drp1 in mammals, are dispensable for mitophagy. Here, we identify Atg44 as a mitochondrial fission factor that is essential for mitophagy in yeasts, and we therefore term Atg44 and its orthologous proteins mitofissin. In mitofissin-deficient cells, a part of the mitochondria is recognized by the mitophagy machinery as cargo but cannot be enwrapped by the autophagosome precursor, the phagophore, due to a lack of mitochondrial fission. Furthermore, we show that mitofissin directly binds to lipid membranes and brings about lipid membrane fragility to facilitate membrane fission. Taken together, we propose that mitofissin acts directly on lipid membranes to drive mitochondrial fission required for mitophagy.
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Affiliation(s)
- Tomoyuki Fukuda
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Kentaro Furukawa
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Tatsuro Maruyama
- Institute of Microbial Chemistry (BIKAKEN), Shinagawa-ku, Tokyo 141-0021, Japan
| | - Shun-Ichi Yamashita
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Daisuke Noshiro
- Institute of Microbial Chemistry (BIKAKEN), Shinagawa-ku, Tokyo 141-0021, Japan; Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido 060-0815, Japan
| | - Chihong Song
- National Institute for Physiological Sciences (NIPS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan; Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan
| | - Yuta Ogasawara
- Institute of Microbial Chemistry (BIKAKEN), Shinagawa-ku, Tokyo 141-0021, Japan; Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido 060-0815, Japan
| | - Kentaro Okuyama
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Jahangir Md Alam
- Institute of Microbial Chemistry (BIKAKEN), Shinagawa-ku, Tokyo 141-0021, Japan
| | - Manabu Hayatsu
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Tetsu Saigusa
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Keiichi Inoue
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Kazuho Ikeda
- Department of Cell Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan; Laboratory for Cell Polarity Regulation, RIKEN Center for Biosystems Dynamics Research (BDR), Osaka 565-0874, Japan
| | - Akira Takai
- Department of Cell Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan; Laboratory for Cell Polarity Regulation, RIKEN Center for Biosystems Dynamics Research (BDR), Osaka 565-0874, Japan
| | - Lin Chen
- National Institute for Physiological Sciences (NIPS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan; Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan
| | - Vikramjit Lahiri
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Yasushi Okada
- Department of Cell Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan; Laboratory for Cell Polarity Regulation, RIKEN Center for Biosystems Dynamics Research (BDR), Osaka 565-0874, Japan; Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan; Universal Biology Institute (UBI) and International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo, Tokyo 113-0033, Japan
| | - Shinsuke Shibata
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Kazuyoshi Murata
- National Institute for Physiological Sciences (NIPS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan; Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences (NINS), Okazaki, Aichi 444-8585, Japan
| | - Daniel J Klionsky
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Nobuo N Noda
- Institute of Microbial Chemistry (BIKAKEN), Shinagawa-ku, Tokyo 141-0021, Japan; Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido 060-0815, Japan.
| | - Tomotake Kanki
- Department of Cellular Physiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan.
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30
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Bauer BL, Rochon K, Liu JC, Ramachandran R, Mears JA. Disease-associated mutations in Drp1 have fundamentally different effects on the mitochondrial fission machinery. Hum Mol Genet 2023; 32:1975-1987. [PMID: 36795043 PMCID: PMC10244223 DOI: 10.1093/hmg/ddad029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/06/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023] Open
Abstract
Patient mutations have been identified throughout dynamin-related protein 1 (Drp1), the key protein mediator of mitochondrial fission. These changes generally impact young children and often result in severe neurological defects and, in some instances, death. Until now, the underlying functional defect leading to patient phenotypes has been largely speculative. We therefore analyzed six disease-associated mutations throughout the GTPase and middle domains (MD) of Drp1. The MD plays a role in Drp1 oligomerization, and three mutations in this region were predictably impaired in self-assembly. However, another mutant in this region (F370C) retained oligomerization capability on pre-curved membranes despite being assembly-limited in solution. Instead, this mutation impaired membrane remodeling of liposomes, which highlights the importance of Drp1 in generating local membrane curvature before fission. Two GTPase domain mutations were also observed in different patients. The G32A mutation was impaired in GTP hydrolysis both in solution and in the presence of lipid but remains capable of self-assembly on these lipid templates. The G223V mutation also exhibited decreased GTPase activity and was able to assemble on pre-curved lipid templates; however, this change impaired membrane remodeling of unilamellar liposomes similar to F370C. This demonstrates that the Drp1 GTPase domain also contributes to self-assembly interactions that drive membrane curvature. Overall, the functional defects caused by mutations in Drp1 are highly variable even for mutations that reside within the same functional domain. This study provides a framework for characterizing additional Drp1 mutations to provide a comprehensive understanding of functional sites within this essential protein.
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Affiliation(s)
- Brianna L Bauer
- Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Kristy Rochon
- Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Jasmine C Liu
- Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Rajesh Ramachandran
- Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
- Cleveland Center for Membrane and Structural Biology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Jason A Mears
- Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
- Cleveland Center for Membrane and Structural Biology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
- Center for Mitochondrial Diseases, Case Western Reserve University School of Medicine, Cleveland, OH 44016, USA
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31
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Gupta S, Bhagavathula M, Sharma V, Sharma N, Sharma N, Biswas A, Palacios A, Salgueiro V, Lavín JL, Dogra N, Salgame P, Prados‐Rosales R, Rodríguez GM. Dynamin-like proteins mediate extracellular vesicle secretion in Mycobacterium tuberculosis. EMBO Rep 2023; 24:e55593. [PMID: 37079766 PMCID: PMC10240201 DOI: 10.15252/embr.202255593] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 03/14/2023] [Accepted: 04/03/2023] [Indexed: 04/22/2023] Open
Abstract
Mycobacterium tuberculosis (Mtb) secretes extracellular vesicles (EVs) containing a variety of proteins, lipoproteins, and lipoglycans. While emerging evidence suggests that EVs contribute to tuberculosis pathogenesis, the factors and molecular mechanisms involved in mycobacterial EV production have not been identified. In this study, we use a genetic approach to identify Mtb proteins that mediate vesicle release in response to iron limitation and antibiotic exposure. We uncover a critical role for the isoniazid-induced, dynamin-like proteins, IniA and IniC, in mycobacterial EV biogenesis. Further characterization of a Mtb iniA mutant shows that the production of EVs enables intracellular Mtb to export bacterial components into the extracellular environment to communicate with host cells and potentially modulate the immune response. The findings advance our understanding of the biogenesis and functions of mycobacterial EVs and provide an avenue for targeting vesicle production in vivo.
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Affiliation(s)
- Shamba Gupta
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Madhuri Bhagavathula
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Vartika Sharma
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Nishant Sharma
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Nevadita Sharma
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Ashis Biswas
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Ainhoa Palacios
- Inflammation and Macrophage Plasticity LabCIC bioGUNEDerioSpain
| | - Vivian Salgueiro
- Department of Preventive Medicine and Public Health and MicrobiologyAutonoma University of MadridMadridSpain
| | | | - Navneet Dogra
- Genetics and Genomic Sciences Icahn School of Medicine at Mount SinaiNew YorkNYUSA
| | - Padmini Salgame
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
| | - Rafael Prados‐Rosales
- Department of Preventive Medicine and Public Health and MicrobiologyAutonoma University of MadridMadridSpain
| | - G Marcela Rodríguez
- Department of Medicine, New Jersey Medical School, Public Health Research InstituteRutgers UniversityNewarkNJUSA
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32
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Ekanayake G, Leslie ME, Smith JM, Heese A. Arabidopsis Dynamin-Related Protein AtDRP2A Contributes to Late Flg22-Signaling and Effective Immunity Against Pseudomonas syringae Bacteria. Mol Plant Microbe Interact 2023; 36:201-207. [PMID: 36653183 DOI: 10.1094/mpmi-10-22-0207-fi] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In eukaryotes, dynamins and dynamin-related proteins (DRPs) are high-molecular weight GTPases responsible for mechanochemical fission of organelles or membranes. Of the six DRP subfamilies in Arabidopsis thaliana, AtDRP1 and AtDRP2 family members serve as endocytic accessory proteins in clathrin-mediated endocytosis. Most studies have focused on AtDRP1A and AtDRP2B as critical modulators of plant pattern-triggered immunity (PTI) against pathogenic, flagellated Pseudomonas syringae pv. tomato DC3000 bacteria and immune signaling in response to the bacterial flagellin peptide flg22. Much less is known about AtDRP2A, the closely related paralog of AtDRP2B. AtDRP2A and AtDRP2B are the only classical, or bona fide, dynamins in Arabidopsis, based on their evolutionary conserved domain structure with mammalian dynamins functioning in endocytosis. AtDRP2B but not AtDRP2A is required for robust ligand-induced endocytosis of the receptor kinase FLAGELLIN SENSING2 for dampening of early flg22 signaling. Here, we utilized Arabidopsis drp2a null mutants to identify AtDRP2A as a positive contributor to effective PTI against P. syringae pv. tomato DC3000 bacteria, consistent with reduced PATHOGEN RELATED1 (PR1) messenger RNA accumulation. We provide evidence that AtDRP2A is a novel modulator of late flg22 signaling, contributing positively to PR1 gene induction but negatively to polyglucan callose deposition. AtDRP2A has no apparent roles in flg22-elicited mitogen-activated protein kinase defense marker gene induction. In summary, this study adds the evolutionary conserved dynamin AtDRP2A to a small group of vesicular trafficking proteins with roles as non-canonical contributors in immune responses, likely due to modulating one or both the localization and activity of multiple different proteins with distinct contributions to immune signaling. [Formula: see text] Copyright © 2023 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Gayani Ekanayake
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, U.S.A
| | - Michelle E Leslie
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, U.S.A
| | - John M Smith
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, U.S.A
- University of Missouri-Columbia, Division of Plant Sciences & Technology, Columbia, MO, U.S.A
| | - Antje Heese
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, U.S.A
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33
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Yang J, Chen P, Cao Y, Liu S, Wang W, Li L, Li J, Jiang Z, Ma Y, Chen S, Zheng S, Qi X, Jiang H. Chemical inhibition of mitochondrial fission via targeting the DRP1-receptor interaction. Cell Chem Biol 2023; 30:278-294.e11. [PMID: 36827981 DOI: 10.1016/j.chembiol.2023.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 09/14/2022] [Accepted: 02/03/2023] [Indexed: 02/25/2023]
Abstract
Mitochondrial fission is critical for mitochondrial dynamics and homeostasis. The dynamin superfamily GTPase DRP1 is recruited by three functionally redundant receptors, MFF, MiD49, and MiD51, to mitochondria to drive fission. Here, we exploit high-content live-cell imaging to screen for mitochondrial fission inhibitors and have developed a covalent compound, mitochondrial division inhibitor (MIDI). MIDI treatment potently blocks mitochondrial fragmentation induced by mitochondrial toxins and restores mitochondrial morphology in fusion-defective cells carrying pathogenic mitofusin and OPA1 mutations. Mechanistically, MIDI does not affect DRP1 tetramerization nor DRP1 GTPase activity but does block DRP1 recruitment to mitochondria. Subsequent biochemical and cellular characterizations reveal an unexpected mechanism that MIDI targets DRP1 interaction with multiple receptors via covalent interaction with DRP1-C367. Taken together, beyond developing a potent mitochondrial fission inhibitor that profoundly impacts mitochondrial morphogenesis, our study establishes proof of concept for developing protein-protein interaction inhibitors targeting DRP1.
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Affiliation(s)
- Jun Yang
- School of Life Sciences, Tsinghua University, Beijing 100084, China; National Institute of Biological Sciences, Beijing 102206, China
| | - Peihao Chen
- National Institute of Biological Sciences, Beijing 102206, China; School of Life Sciences, Peking University, Beijing, China
| | - Yu Cao
- National Institute of Biological Sciences, Beijing 102206, China; College of Life Sciences, Beijing Normal University, Beijing, China
| | - Shanshan Liu
- National Institute of Biological Sciences, Beijing 102206, China
| | - Wei Wang
- National Institute of Biological Sciences, Beijing 102206, China; School of Life Sciences, Peking University, Beijing, China
| | - Lin Li
- National Institute of Biological Sciences, Beijing 102206, China
| | - Jiaojiao Li
- National Institute of Biological Sciences, Beijing 102206, China
| | - Zhaodi Jiang
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - Yan Ma
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - She Chen
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - Sanduo Zheng
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - Xiangbing Qi
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China.
| | - Hui Jiang
- School of Life Sciences, Tsinghua University, Beijing 100084, China; National Institute of Biological Sciences, Beijing 102206, China; Beijing Key Laboratory of Cell Biology for Animal Aging, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China.
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Rodríguez AG, Rodríguez JZ, Barreto A, Sanabria-Barrera S, Iglesias J, Morales L. Impact of Acute High Glucose on Mitochondrial Function in a Model of Endothelial Cells: Role of PDGF-C. Int J Mol Sci 2023; 24:ijms24054394. [PMID: 36901825 PMCID: PMC10003065 DOI: 10.3390/ijms24054394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/13/2023] [Accepted: 02/18/2023] [Indexed: 02/25/2023] Open
Abstract
An increase in plasma high glucose promotes endothelial dysfunction mainly through increasing mitochondrial ROS production. High glucose ROS-induced has been implicated in the fragmentation of the mitochondrial network, mainly by an unbalance expression of mitochondrial fusion and fission proteins. Mitochondrial dynamics alterations affect cellular bioenergetics. Here, we assessed the effect of PDGF-C on mitochondrial dynamics and glycolytic and mitochondrial metabolism in a model of endothelial dysfunction induced by high glucose. High glucose induced a fragmented mitochondrial phenotype associated with the reduced expression of OPA1 protein, high DRP1pSer616 levels and reduced basal respiration, maximal respiration, spare respiratory capacity, non-mitochondrial oxygen consumption and ATP production, regarding normal glucose. In these conditions, PDGF-C significantly increased the expression of OPA1 fusion protein, diminished DRP1pSer616 levels and restored the mitochondrial network. On mitochondrial function, PDGF-C increased the non-mitochondrial oxygen consumption diminished by high glucose conditions. These results suggest that PDGF-C modulates the damage induced by HG on the mitochondrial network and morphology of human aortic endothelial cells; additionally, it compensates for the alteration in the energetic phenotype induced by HG.
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Affiliation(s)
- Adriana Grismaldo Rodríguez
- Experimental and Computational Biochemistry Group, Faculty of Sciences, Nutrition and Biochemistry Department, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
- Correspondence: (A.G.R.); (L.M.); Tel.: +57-3114566976 (A.G.R.); +57-3132107272 (L.M.)
| | - Jairo Zamudio Rodríguez
- Experimental and Computational Biochemistry Group, Faculty of Sciences, Nutrition and Biochemistry Department, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
| | - Alfonso Barreto
- Immunology and Cell Biology Group, Faculty of Sciences, Microbiology Department, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
| | - Sandra Sanabria-Barrera
- Bioengineering FCV Research Group, Department of Innovation and Technological Development, Fundación Cardiovascular de Colombia, Floridablanca 680004, Colombia
| | - José Iglesias
- Experimental and Computational Biochemistry Group, Faculty of Sciences, Nutrition and Biochemistry Department, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
| | - Ludis Morales
- Experimental and Computational Biochemistry Group, Faculty of Sciences, Nutrition and Biochemistry Department, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
- Correspondence: (A.G.R.); (L.M.); Tel.: +57-3114566976 (A.G.R.); +57-3132107272 (L.M.)
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35
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Robertson GL, Riffle S, Patel M, Bodnya C, Marshall A, Beasley HK, Garza-Lopez E, Shao J, Vue Z, Hinton A, Stoll MS, de Wet S, Theart RP, Chakrabarty RP, Loos B, Chandel NS, Mears JA, Gama V. DRP1 mutations associated with EMPF1 encephalopathy alter mitochondrial membrane potential and metabolic programs. J Cell Sci 2023; 136:jcs260370. [PMID: 36763487 PMCID: PMC10657212 DOI: 10.1242/jcs.260370] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 12/22/2022] [Indexed: 02/11/2023] Open
Abstract
Mitochondria and peroxisomes are dynamic signaling organelles that constantly undergo fission, driven by the large GTPase dynamin-related protein 1 (DRP1; encoded by DNM1L). Patients with de novo heterozygous missense mutations in DNM1L present with encephalopathy due to defective mitochondrial and peroxisomal fission (EMPF1) - a devastating neurodevelopmental disease with no effective treatment. To interrogate the mechanisms by which DRP1 mutations cause cellular dysfunction, we used human-derived fibroblasts from patients who present with EMPF1. In addition to elongated mitochondrial morphology and lack of fission, patient cells display lower coupling efficiency, increased proton leak and upregulation of glycolysis. Mitochondrial hyperfusion also results in aberrant cristae structure and hyperpolarized mitochondrial membrane potential. Peroxisomes show a severely elongated morphology in patient cells, which is associated with reduced respiration when cells are reliant on fatty acid oxidation. Metabolomic analyses revealed impaired methionine cycle and synthesis of pyrimidine nucleotides. Our study provides insight into the role of mitochondrial dynamics in cristae maintenance and the metabolic capacity of the cell, as well as the disease mechanism underlying EMPF1.
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Affiliation(s)
| | - Stellan Riffle
- Vanderbilt University, Cell and Developmental Biology, Nashville, TN 37232, USA
| | - Mira Patel
- Vanderbilt University, Cell and Developmental Biology, Nashville, TN 37232, USA
| | - Caroline Bodnya
- Vanderbilt University, Cell and Developmental Biology, Nashville, TN 37232, USA
| | - Andrea Marshall
- Vanderbilt University, Molecular Physiology and Biophysics, Nashville, TN 37232, USA
| | - Heather K. Beasley
- Vanderbilt University, Molecular Physiology and Biophysics, Nashville, TN 37232, USA
| | - Edgar Garza-Lopez
- Vanderbilt University, Molecular Physiology and Biophysics, Nashville, TN 37232, USA
| | - Jianqiang Shao
- Central Microscopy Research Facility, University of Iowa, Iowa City, IA 52246, USA
| | - Zer Vue
- Vanderbilt University, Molecular Physiology and Biophysics, Nashville, TN 37232, USA
| | - Antentor Hinton
- Vanderbilt University, Molecular Physiology and Biophysics, Nashville, TN 37232, USA
| | - Maria S. Stoll
- Case Western Reserve University, Department of Pharmacology and Center for Mitochondrial Diseases, Cleveland, OH 44106, USA
| | - Sholto de Wet
- Stellenbosch University, Department of Physiological Sciences, Matieland, 7602, Stellenbosch, South Africa
| | - Rensu P. Theart
- Stellenbosch University, Department of Electrical and Electronic Engineering, Matieland, 7602, Stellenbosch, South Africa
| | - Ram Prosad Chakrabarty
- Northwestern University, Feinberg School of Medicine Department of Medicine Division of Pulmonary and Critical Care Medicine, Chicago, IL 60611, USA
| | - Ben Loos
- Stellenbosch University, Department of Electrical and Electronic Engineering, Matieland, 7602, Stellenbosch, South Africa
| | - Navdeep S. Chandel
- Northwestern University, Feinberg School of Medicine Department of Medicine Division of Pulmonary and Critical Care Medicine, Chicago, IL 60611, USA
- Northwestern University, Feinberg School of Medicine Department of Biochemistry and Molecular Genetics, Chicago, IL 60611, USA
| | - Jason A. Mears
- Case Western Reserve University, Department of Pharmacology and Center for Mitochondrial Diseases, Cleveland, OH 44106, USA
| | - Vivian Gama
- Vanderbilt University, Cell and Developmental Biology, Nashville, TN 37232, USA
- Vanderbilt University, Vanderbilt Center for Stem Cell Biology, Nashville, TN 37232, USA
- Vanderbilt University, Vanderbilt Brain Institute, Nashville, TN 37232, USA
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36
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Mc Gowan G, Ekanayake G, Ingle RA, Heese A. Novel roles for Arabidopsis dynamin-related proteins DRP1A and DRP2B in resistance against Botrytis cinerea fungal infection. Plant Signal Behav 2022; 17:2129296. [PMID: 36200597 PMCID: PMC9543063 DOI: 10.1080/15592324.2022.2129296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Arabidopsis DYNAMIN-RELATED PROTEIN1A (AtDRP1A) and AtDRP2B are large GTPases that function together in endocytosis for effective cytokinesis, cell enlargement and development. A recent study shows that these DRPs contribute to ligand-induced endocytosis of the immune receptor FLAGELLIN SENSING2 (AtFLS2) to modulate flg22-immune signaling, and they are required for immunity against Pseudomonas syringae pv. tomato bacteria. Here, we demonstrate that atdrp1a and atdrp2b single mutants showed increased susceptibility to Botrytis cinerea indicating that AtDRP1A and AtDRP2B are necessary for effective resistance against this necrotrophic fungus. Thus, we expanded our limited understanding of clathrin endocytic accessory proteins in immunity against plant pathogens.
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Affiliation(s)
- Grant Mc Gowan
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, South Africa
| | - Gayani Ekanayake
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, USA
| | - Robert A. Ingle
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, South Africa
| | - Antje Heese
- University of Missouri-Columbia, Division of Biochemistry, Interdisciplinary Plant Group (IPG), Columbia, MO, USA
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37
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Egner JM, Nolden KA, Harwig MC, Bonate RP, De Anda J, Tessmer MH, Noey EL, Ihenacho UK, Liu Z, Peterson FC, Wong GCL, Widlansky ME, Hill RB. Structural studies of human fission protein FIS1 reveal a dynamic region important for GTPase DRP1 recruitment and mitochondrial fission. J Biol Chem 2022; 298:102620. [PMID: 36272645 PMCID: PMC9747602 DOI: 10.1016/j.jbc.2022.102620] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2022] Open
Abstract
Fission protein 1 (FIS1) and dynamin-related protein 1 (DRP1) were initially described as being evolutionarily conserved for mitochondrial fission, yet in humans the role of FIS1 in this process is unclear and disputed by many. In budding yeast where Fis1p helps to recruit the DRP1 ortholog from the cytoplasm to mitochondria for fission, an N-terminal "arm" of Fis1p is required for function. The yeast Fis1p arm interacts intramolecularly with a conserved tetratricopeptide repeat core and governs in vitro interactions with yeast DRP1. In human FIS1, NMR and X-ray structures show different arm conformations, but its importance for human DRP1 recruitment is unknown. Here, we use molecular dynamics simulations and comparisons to experimental NMR chemical shifts to show the human FIS1 arm can adopt an intramolecular conformation akin to that observed with yeast Fis1p. This finding is further supported through intrinsic tryptophan fluorescence and NMR experiments on human FIS1 with and without the arm. Using NMR, we observed the human FIS1 arm is also sensitive to environmental changes. We reveal the importance of these findings in cellular studies where removal of the FIS1 arm reduces DRP1 recruitment and mitochondrial fission similar to the yeast system. Moreover, we determined that expression of mitophagy adapter TBC1D15 can partially rescue arm-less FIS1 in a manner reminiscent of expression of the adapter Mdv1p in yeast. These findings point to conserved features of FIS1 important for its activity in mitochondrial morphology. More generally, other tetratricopeptide repeat-containing proteins are flanked by disordered arms/tails, suggesting possible common regulatory mechanisms.
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Affiliation(s)
- John M Egner
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Kelsey A Nolden
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Megan Cleland Harwig
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Ryan P Bonate
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Jaime De Anda
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
| | - Maxx H Tessmer
- Department of Microbiology & Immunology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Elizabeth L Noey
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Ugochukwu K Ihenacho
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Ziwen Liu
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
| | - Francis C Peterson
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Gerard C L Wong
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
| | - Michael E Widlansky
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - R Blake Hill
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
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38
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Zhao X, Xu H, Li Y, Liu Y, Li X, Zhou W, Wang J, Guo C, Sun Z, Li Y. Silica nanoparticles perturbed mitochondrial dynamics and induced myocardial apoptosis via PKA-DRP1-mitochondrial fission signaling. Sci Total Environ 2022; 842:156854. [PMID: 35750168 DOI: 10.1016/j.scitotenv.2022.156854] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 06/15/2022] [Accepted: 06/17/2022] [Indexed: 05/20/2023]
Abstract
Silica nanoparticles (SiNPs) are among the most abundantly produced nanosized particles in the global market, and their potential toxicity has aroused a great concern. Increasing epidemiological investigations and experimental evidence revealed the threaten of SiNPs exposure to cardiovascular system. The myocardial toxicity caused by SiNPs was gradually demonstrated, nevertheless, the underlying mechanisms remain unclear. In view of mitochondria serving as the centrality in the prominent of cardiovascular disease, we investigated the role of mitochondria and related mechanisms in SiNPs-induced adverse effects on cardiomyocytes. As a result, SiNPs were found in cytoplasm, accompanied with morphological alterations in mitochondria, such as cristae fracture or disappearance, vacuolation. The induction of mitochondrial dysfunction by SiNPs was confirmed, as indicated by the excessive reactive oxygen species (ROS) formation, and blockage of cellular respiratory and ATP production. Concomitantly, SiNPs activated mitochondria-mediated apoptotic signaling in view of the up-regulated BAX, increased Caspase-9 cleavage and declined Bcl-2, ultimately resulting in myocardial apoptosis. It was noteworthy that SiNPs disturbed mitochondrial dynamics toward fission phenotype, which was supported by the dysregulated fission/fusion regulators. Especially, DRP1 and its phosphorylated level at s616 (p-DRP1s616) were up-regulated, whilst its phosphorylated level at s637 (p-DRP1s637) and PKA phosphorylation were down-regulated in SiNPs-treated cardiomyocytes in a dose-dependent manner. More importantly, the mechanistic investigations revealed PKA-DRP1-mediated mitochondrial fission was responsible for SiNPs-induced cardiomyocyte apoptosis through the mitochondria-mediated apoptotic way. This study firstly demonstrated the disturbance of mitochondrial dynamics played a crucial role in cardiomyocyte apoptosis caused by SiNPs, attributing to PKA-DRP1-mitochondrial fission signaling.
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Affiliation(s)
- Xinying Zhao
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Hailin Xu
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Yan Li
- Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China; Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing 100069, China
| | - Yufan Liu
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Xueyan Li
- Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China; Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing 100069, China
| | - Wei Zhou
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing 100850, China
| | - Ji Wang
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Caixia Guo
- Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China; Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing 100069, China.
| | - Zhiwei Sun
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Yanbo Li
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
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39
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Xiong X, Hasani S, Young LEA, Rivas DR, Skaggs AT, Martinez R, Wang C, Weiss HL, Gentry MS, Sun RC, Gao T. Activation of Drp1 promotes fatty acids-induced metabolic reprograming to potentiate Wnt signaling in colon cancer. Cell Death Differ 2022; 29:1913-1927. [PMID: 35332310 PMCID: PMC9525627 DOI: 10.1038/s41418-022-00974-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 11/09/2022] Open
Abstract
Cancer cells are known for their ability to adapt variable metabolic programs depending on the availability of specific nutrients. Our previous studies have shown that uptake of fatty acids alters cellular metabolic pathways in colon cancer cells to favor fatty acid oxidation. Here, we show that fatty acids activate Drp1 to promote metabolic plasticity in cancer cells. Uptake of fatty acids (FAs) induces mitochondrial fragmentation by promoting ERK-dependent phosphorylation of Drp1 at the S616 site. This increased phosphorylation of Drp1 enhances its dimerization and interaction with Mitochondrial Fission Factor (MFF) at the mitochondria. Consequently, knockdown of Drp1 or MFF attenuates fatty acid-induced mitochondrial fission. In addition, uptake of fatty acids triggers mitophagy via a Drp1- and p62-dependent mechanism to protect mitochondrial integrity. Moreover, results from metabolic profiling analysis reveal that silencing Drp1 disrupts cellular metabolism and blocks fatty acid-induced metabolic reprograming by inhibiting fatty acid utilization. Functionally, knockdown of Drp1 decreases Wnt/β-catenin signaling by preventing fatty acid oxidation-dependent acetylation of β-catenin. As a result, Drp1 depletion inhibits the formation of tumor organoids in vitro and xenograft tumor growth in vivo. Taken together, our study identifies Drp1 as a key mediator that connects mitochondrial dynamics with fatty acid metabolism and cancer cell signaling.
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Affiliation(s)
- Xiaopeng Xiong
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Sumati Hasani
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Lyndsay E A Young
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Dylan R Rivas
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Ashley T Skaggs
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Rebecca Martinez
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Chi Wang
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Heidi L Weiss
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Matthew S Gentry
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Ramon C Sun
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA
- Department of Neuroscience, University of Kentucky, Lexington, KY, 40536-0679, USA
| | - Tianyan Gao
- Markey Cancer Center, University of Kentucky, Lexington, KY, 40536-0679, USA.
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, 40536-0679, USA.
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40
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Zhang L, Liu Y, Wang Q, Wang C, Lv S, Wang Y, Wang J, Wang Y, Yuan J, Zhang H, Kang Z, Ji W. An alternative splicing isoform of wheat TaYRG1 resistance protein activates immunity by interacting with dynamin-related proteins. J Exp Bot 2022; 73:5474-5489. [PMID: 35652375 DOI: 10.1093/jxb/erac245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
Wheat (Triticum aestivum) is a commercially important crop and its production is seriously threatened by the fungal pathogen Puccinia striiformis f. sp. tritici West (Pst). Resistance (R) genes are critical factors that facilitate plant immune responses. Here, we report a wheat R gene NB-ARC-LRR ortholog, TaYRG1, that is associated with distinct alternative splicing events in wheat infected by Pst. The native splice variant, TaYRG1.6, encodes internal-motif-deleted polypeptides with the same N- and C-termini as TaYRG1.1, resulting in gain of function. Transient expression of protein variants in Nicotiana benthamiana showed that the NB and ARC domains, and TaYRG1.6 (half LRR domain), stimulate robust elicitor-independent cell death based on a signal peptide, although the activity was negatively modulated by the CC and complete LRR domains. Furthermore, molecular genetic analyses indicated that TaYRG1.6 enhanced resistance to Pst in wheat. Moreover, we provide multiple lines of evidence that TaYRG1.6 interacts with a dynamin-related protein, TaDrp1. Proteome profiling suggested that the TaYRG1.6-TaDrp1-DNM complex in the membrane trafficking systems may trigger cell death by mobilizing lipid and kinase signaling in the endocytosis pathway. Our findings reveal a unique mechanism by which TaYRG1 activates cell death and enhances disease resistance by reconfiguring protein structure through alternative splicing.
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Affiliation(s)
- Lu Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Yuanming Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Qiaohui Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Chao Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Shikai Lv
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Yanzhen Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Jianfeng Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Yajuan Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Jing Yuan
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Hong Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
| | - Zhensheng Kang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Wanquan Ji
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
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Sun S, Yu W, Xu H, Li C, Zou R, Wu NN, Wang L, Ge J, Ren J, Zhang Y. TBC1D15-Drp1 interaction-mediated mitochondrial homeostasis confers cardioprotection against myocardial ischemia/reperfusion injury. Metabolism 2022; 134:155239. [PMID: 35680100 DOI: 10.1016/j.metabol.2022.155239] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 05/17/2022] [Accepted: 06/03/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Mitochondria are essential for myocardial ischemia/reperfusion (I/R) injury. TBC domain family member 15 (TBC1D15) participates in the regulation of mitochondrial homeostasis although its role remains elusive in I/R injury. METHODS AND MATERIALS This study examined the role of TBC1D15 in mitochondrial homeostasis under myocardial I/R injury using inducible cardiac-specific TBC1D15 knockin (TBC1D15CKI) and knockout (TBC1D15CKO) mice. RESULTS TBC1D15 mRNA/protein levels were downregulated in human ischemic cardiomyopathy samples, mouse I/R hearts and neonatal mouse cardiomyocytes with H/R injury, consistent with scRNA sequencing finding from patients with coronary heart disease. Cardiac-specific knockin of TBC1D15 attenuated whereas cardiac-specific knockout of TBC1D15 overtly aggravated I/R-induced cardiomyocyte apoptosis and cardiac dysfunction. TBC1D15CKI mice exhibited reduced mitochondrial damage and mitochondrial fragmentation following myocardial I/R injury, while TBC1D15CKO mice displayed opposite results. TBC1D15 preserved mitochondrial function evidenced by safeguarding MMP and oxygen consumption capacity, antagonizing ROS accumulation and cytochrome C release, which were nullified by TBC1D15 knockdown. Time-lapse confocal microscopy revealed that TBC1D15 activated asymmetrical mitochondrial fission through promoting mitochondria-lysosome contacts untethering in NMCMs under H/R injury, whereas overexpression of TBC1D15 mutants (R400K and ∆231-240) failed to regulate asymmetrical fission and knockdown of TBC1D15 slowed down asymmetrical fission. Moreover, TBC1D15-offered benefits were mitigated by knockdown of Fis1 and Drp1. Mechanistically, TBC1D15 recruited Drp1 to mitochondria-lysosome contact sites via direct interaction with Drp1 through its C terminus (574-624) domain. Interfering with interaction between TBC1D15 and Drp1 abrogated asymmetrical mitochondrial fission and mitochondrial function. Cardiac phenotypes of TBC1D15CKO mice upon I/R injury were rescued by adenovirus-mediated overexpression of wild-type but not mutants (R400K, ∆231-240 and ∆574-624) TBC1D15. CONCLUSIONS TBC1D15 ameliorated I/R injury through a novel modality to preserve mitochondrial homeostasis where mitochondria-lysosome contacts (through the TBC1D15/Fis1/RAB7 cascade) regulate asymmetrical mitochondrial fission (TBC1D15/Drp1 interaction), suggesting promises of targeting TBC1D15 in the management of myocardial I/R injury.
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Affiliation(s)
- Shiqun Sun
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Wenjun Yu
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China; Department of Cardiovascular Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, China
| | - Haixia Xu
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China; Department of Cardiology, Affiliated Hospital of Nantong University, Nantong 226001, China
| | - Congye Li
- Department of Cardiology, Xijing Hospital, the Air Force Military Medical University, Xi'an 710038, China
| | - Rongjun Zou
- Heart Center, Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Ne N Wu
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Li Wang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Junbo Ge
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Jun Ren
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA 98195, USA.
| | - Yingmei Zhang
- Department of Cardiology and Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
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42
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Guha S, Cheng A, Carroll T, King D, Koren SA, Swords S, Nehrke K, Johnson GVW. Selective disruption of Drp1-independent mitophagy and mitolysosome trafficking by an Alzheimer's disease relevant tau modification in a novel Caenorhabditis elegans model. Genetics 2022; 222:iyac104. [PMID: 35916724 PMCID: PMC9434186 DOI: 10.1093/genetics/iyac104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 07/06/2022] [Indexed: 11/14/2022] Open
Abstract
Accumulation of inappropriately phosphorylated tau into neurofibrillary tangles is a defining feature of Alzheimer's disease, with Tau pT231 being an early harbinger of tau pathology. Previously, we demonstrated that expressing a single genomic copy of human phosphomimetic mutant tau (T231E) in Caenorhabditis elegans drove age-dependent neurodegeneration. A critical finding was that T231E, unlike wild-type tau, completely and selectively suppressed oxidative stress-induced mitophagy. Here, we used dynamic imaging approaches to analyze T231E-associated changes in mitochondria and mitolysosome morphology, abundance, trafficking, and stress-induced mitophagy as a function of mitochondrial fission mediator dynamin-related protein 1, which has been demonstrated to interact with hyper phosphorylated tau and contribute to Alzheimer's disease pathogenesis, as well as Pink1, a well-recognized mediator of mitochondrial quality control that works together with Parkin to support stress-induced mitophagy. T231E impacted both mitophagy and mitolysosome neurite trafficking with exquisite selectivity, sparing macroautophagy as well as lysosome and autolysosome trafficking. Both oxidative-stress-induced mitophagy and the ability of T231E to suppress it were independent of drp-1, but at least partially dependent on pink-1. Organelle trafficking was more complicated, with drp-1 and pink-1 mutants exerting independent effects, but generally supported the idea that the mitophagy phenotype is of greater physiologic impact in T231E. Collectively, our results refine the mechanistic pathway through which T231E causes neurodegeneration, demonstrating pathologic selectivity for mutations that mimic tauopathy-associated post-translational modifications, physiologic selectivity for organelles that contain damaged mitochondria, and molecular selectivity for dynamin-related protein 1-independent, Pink1-dependent, perhaps adaptive, and mitophagy.
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Affiliation(s)
- Sanjib Guha
- Department of Anesthesiology & Perioperative Medicine, University of Rochester, Rochester, NY 14642, USA
| | - Anson Cheng
- Department of Anesthesiology & Perioperative Medicine, University of Rochester, Rochester, NY 14642, USA
| | - Trae Carroll
- Department of Pathology and Laboratory Medicine, University of Rochester, Rochester, NY 14642, USA
| | - Dennisha King
- Department of Neuroscience, University of Rochester, Rochester, NY 14642, USA
| | - Shon A Koren
- Department of Anesthesiology & Perioperative Medicine, University of Rochester, Rochester, NY 14642, USA
| | - Sierra Swords
- Department of Molecular Biology and Biochemistry, Rutgers University, New Brunswick, NJ 08901, USA
| | - Keith Nehrke
- Department of Medicine, Nephrology Division, University of Rochester, Rochester, NY 14642, USA
| | - Gail V W Johnson
- Department of Anesthesiology & Perioperative Medicine, University of Rochester, Rochester, NY 14642, USA
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Wang M, Wei R, Li G, Bi HL, Jia Z, Zhang M, Pang M, Li X, Ma L, Tang Y. SUMOylation of SYNJ2BP-COX16 promotes breast cancer progression through DRP1-mediated mitochondrial fission. Cancer Lett 2022; 547:215871. [PMID: 35998797 DOI: 10.1016/j.canlet.2022.215871] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 08/07/2022] [Accepted: 08/08/2022] [Indexed: 11/19/2022]
Abstract
Treatments targeting oncogenic fusion proteins are notable examples of successful drug development. Abnormal splicing of genes resulting in fusion proteins is a critical driver of various tumors, but the underlying mechanism remains poorly understood. Here, we show that SUMOylation of the fusion protein Synaptojanin 2 binding protein-Cytochrome-c oxidase 16 (SYNJ2BP-COX16) at K107 induces mitochondrial fission in breast cancer and that the K107 site regulates SYNJ2BP-COX16 mitochondrial subcellular localization. Compared with a non-SUMOylated K107R mutant, wild-type SYNJ2BP-COX16 contributed to breast cancer cell proliferation and metastasis in vivo and in vitro by increasing adenosine triphosphate (ATP) production and cytochrome-c oxidase (COX) activity. SUMOylated SYNJ2BP-COX16 recruits dynamin-related protein 1 (DRP1) to the mitochondria to promote ubiquitin-conjugating enzyme 9 (UBC9) binding to DRP1, enhance SUMOylation of DRP1 and phosphorylation of DRP1 at S616, and then induce mitochondrial fission. Moreover, Mdivi-1, an inhibitor of DRP1 phosphorylation, decreased the localization of DRP1 in mitochondria, and prevents SYNJ2BP-COX16 induced mitochondrial fission, cell proliferation and metastasis. Based on these data, SYNJ2BP-COX16 promotes breast cancer progression through the phosphorylation of DRP1 and subsequent induction of mitochondrial fission, indicating that SUMOylation at the K107 residue of SYNJ2BP-COX16 is a novel potential treatment target for breast cancer.
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Affiliation(s)
- Miao Wang
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Ranru Wei
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Guohui Li
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China; College of New Materials and Chemical Engineering, Beijing Key Laboratory of Enze Biomass Fine Chemicals, Beijing Institute of Petrochemical Technology, Beijing, China.
| | - Hai-Lian Bi
- Institute of Cardiovascular Diseases, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, 116024, China.
| | - Zhaojun Jia
- College of New Materials and Chemical Engineering, Beijing Key Laboratory of Enze Biomass Fine Chemicals, Beijing Institute of Petrochemical Technology, Beijing, China.
| | - Mengjie Zhang
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Mengyao Pang
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Xiaona Li
- School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Liming Ma
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
| | - Ying Tang
- School of Bioengineering, Dalian University of Technology, No.2 Linggong Road, Dalian, Liaoning Province, 116024, China.
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Adhikari D, Lee IW, Al-Zubaidi U, Liu J, Zhang QH, Yuen WS, He L, Winstanley Y, Sesaki H, Mann JR, Robker RL, Carroll J. Depletion of oocyte dynamin-related protein 1 shows maternal-effect abnormalities in embryonic development. Sci Adv 2022; 8:eabl8070. [PMID: 35704569 PMCID: PMC9200162 DOI: 10.1126/sciadv.abl8070] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Eggs contain about 200,000 mitochondria that generate adenosine triphosphate and metabolites essential for oocyte development. Mitochondria also integrate metabolism and transcription via metabolites that regulate epigenetic modifiers, but there is no direct evidence linking oocyte mitochondrial function to the maternal epigenome and subsequent embryo development. Here, we have disrupted oocyte mitochondrial function via deletion of the mitochondrial fission factor Drp1. Fission-deficient oocytes exhibit a high frequency of failure in peri- and postimplantation development. This is associated with altered mitochondrial function, changes in the oocyte transcriptome and proteome, altered subcortical maternal complex, and a decrease in oocyte DNA methylation and H3K27me3. Transplanting pronuclei of fertilized Drp1 knockout oocytes to normal ooplasm fails to rescue embryonic lethality. We conclude that mitochondrial function plays a role in establishing the maternal epigenome, with serious consequences for embryo development.
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Affiliation(s)
- Deepak Adhikari
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
- Corresponding author. (D.A.); (J.C.)
| | - In-won Lee
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Usama Al-Zubaidi
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
- Applied Embryology Department, High Institute for Infertility Diagnosis and Assisted Reproductive Technologies, Al-Nahrain University, Baghdad, Iraq
| | - Jun Liu
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Qing-Hua Zhang
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Wai Shan Yuen
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Likun He
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Yasmyn Winstanley
- School of Biomedicine, Discipline of Reproduction and Development, Robinson Research Institute, The University of Adelaide, South Australia 5005, Australia
| | - Hiromi Sesaki
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, 109 Hunterian, Baltimore, MD 21205, USA
| | - Jeffrey R. Mann
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Rebecca L. Robker
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
- School of Pediatrics and Reproductive Health, Robinson Research Institute, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - John Carroll
- Development and Stem Cell Program and Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
- Corresponding author. (D.A.); (J.C.)
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Kandimalla R, Manczak M, Pradeepkiran JA, Morton H, Reddy PH. A partial reduction of Drp1 improves cognitive behavior and enhances mitophagy, autophagy and dendritic spines in a transgenic Tau mouse model of Alzheimer disease. Hum Mol Genet 2022; 31:1788-1805. [PMID: 34919689 PMCID: PMC9169458 DOI: 10.1093/hmg/ddab360] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/18/2021] [Accepted: 12/10/2021] [Indexed: 11/13/2022] Open
Abstract
The purpose of our study is to understand the impact of a partial dynamin-related protein 1 (Drp1) on cognitive behavior, mitophagy, autophagy and mitochondrial and synaptic activities in transgenic Tau mice in Alzheimer's disease (AD). Our laboratory reported increased levels of amyloid-beta (Aβ) and phosphorylated Tau (P-Tau) and reported that abnormal interactions between Aβ and Drp1, P-Tau and Drp1 induced increased mitochondrial fragmentation and reduced fusion and synaptic activities in AD. These abnormal interactions result in the proliferation of dysfunctional mitochondria in AD neurons. Recent research on mitochondria revealed that fission protein Drp1 is largely implicated in mitochondrial dynamics in AD. To determine the impact of reduced Drp1 in AD, we recently crossed transgenic Tau mice with Drp1 heterozygote knockout (Drp1+/-) mice and generated double mutant (P301LDrp1+/-) mice. In the current study, we assessed the cognitive behavior, mRNA and protein levels of mitophagy, autophagy, mitochondrial biogenesis, dynamics and synaptic genes, mitochondrial morphology and mitochondrial function and dendritic spines in Tau mice relative to double mutant mice. When compared with Tau mice, double mutant mice did better on the Morris Maze (reduced latency to find hidden platform, increased swimming speed and time spent on quadrant) and rotarod (stayed a longer period of time) tests. Both mRNA- and protein-level autophagy, mitophagy, mitochondrial biogenesis and synaptic proteins were increased in double mutant mice compared with Tau (P301L) mice. Dendritic spines were significantly increased; mitochondrial number was reduced and length was increased in double mutant mice. Based on these observations, we conclude that reduced Drp1 is beneficial in a symptomatic-transgenic Tau (P301L) mice.
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Affiliation(s)
- Ramesh Kandimalla
- Garrison Institute on Aging, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Applied Biology, CSIR-Indian Institute of Technology, Uppal Road, Tarnaka, Hyderabad, Telangana 50000, India
| | - Maria Manczak
- Garrison Institute on Aging, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | | | - Hallie Morton
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - P Hemachandra Reddy
- To whom correspondence should be addressed at: Department of Internal Medicine, Texas Tech University Health Sciences Center, 3601 4th Street, Lubbock, TX 79430, USA. Tel: +1 8067433194;
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Liu J, Li L, Xie P, Zhao X, Shi D, Zhang Y, Pan C, Li T. Sevoflurane induced neurotoxicity in neonatal mice links to a GSK3β/Drp1-dependent mitochondrial fission and apoptosis. Free Radic Biol Med 2022; 181:72-81. [PMID: 35122996 DOI: 10.1016/j.freeradbiomed.2022.01.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 01/27/2022] [Accepted: 01/31/2022] [Indexed: 12/01/2022]
Abstract
Mitochondria damage and apoptosis were found associated with sevoflurane induced neurotoxicity in developing brains of rodent and neuro cell lines. The detailed upstream mechanism remains unclear. This study explored whether sevoflurane induces neurotoxicity by activating a GSK3β (glycogen synthase kinase 3β)/Drp1 (dynamin-related protein-1)-dependent mitochondrial fission and apoptosis. Our results showed that sevoflurane exposure promoted mitochondria fission in hippocampus of neonatal mice, resulted in a prolonged escape latency from P32 (32-day-postnatal) to P35, and decreased platform crossing times on P36 as compared to the control treatment. Additionally, sevoflurane upregulated GSK3β stability and activation, promoted phosphorylation of Drp1 at Ser616 along with its translocation to mitochondria and resulted in increasing cytochrome c and cleaved casepase-3 in hippocampus of neonatal mice and in human SK-N-SH cells. Simultaneously, sevoflurane promoted the interaction between Drp1 and GSK3β. Furthermore, GSK3β activated phosphorylation of Drp1 at Ser616, induced mitochondrial fission, loss of mitochondrial membrane potential (MMP) and apoptosis in SK-N-SH cells, which was attenuated by TDZD-8, an inhibitor of GSK3β. In conclusion, sevoflurane induced neurotoxicity links to a GSK3β/Drp1 dependent mitochondrial fission and apoptosis.
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Affiliation(s)
- Jinsheng Liu
- Department of Anesthesiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Li Li
- Department of Gastroenterology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Ping Xie
- Department of Cell Biology, Municipal Laboratory for Liver Protection and Regulation of Regeneration, Capital Medical University, Beijing, China
| | - Xiaoyan Zhao
- Department of Anesthesiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Dongjing Shi
- Department of Anesthesiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Yan Zhang
- College of Life Science, Peking University, Beijing, China
| | - Chuxiong Pan
- Department of Anesthesiology, Beijing Stomatological Hospital, Capital Medical University, Beijing, China.
| | - Tianzuo Li
- Department of Anesthesiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
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Yang Y, Liu Y, Zhu J, Song S, Huang Y, Zhang W, Sun Y, Hao J, Yang X, Gao Q, Ma Z, Zhang J, Gu X. Neuroinflammation-mediated mitochondrial dysregulation involved in postoperative cognitive dysfunction. Free Radic Biol Med 2022; 178:134-146. [PMID: 34875338 DOI: 10.1016/j.freeradbiomed.2021.12.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/20/2021] [Accepted: 12/02/2021] [Indexed: 12/22/2022]
Abstract
Neuroinflammation following peripheral surgery is a pivotal pathogenic mechanism of postoperative cognitive dysfunction (POCD). However, the key site of inflammation-mediated neural damage remains unclear. Impaired mitochondrial function is a vital feature of degenerated neurons. Dynamin-related protein 1 (DRP1), a crucial regulator of mitochondrial dynamics, has been shown to play an essential role in synapse formation. Here, we designed experiments to assess whether Drp1-regulated mitochondrial dynamics and function are involved in the pathological processes of POCD and elucidate its relationship with neuroinflammation. Aged mice were subjected to experimental laparotomy under isoflurane anesthesia. Primary neurons and SH-SY5Y cells were exposed to tumor necrosis factor (TNF). We found an increase in Drp1 activation as well as mitochondrial fragmentation both in the hippocampus of mice after surgery and primary neurons after TNF exposure. Pretreatment with Mdivi-1, a Drp1 specific inhibitor, reduced this mitochondrial fragmentation. Drp1 knockdown with small interfering RNA blocked TNF-induced mitochondrial fragmentation in SH-SY5Y cells. However, the application of Mdivi-1 exhibited a negative impact on mitochondrial function and neurite growth in primary neurons. Calcineurin activity was increased in primary neurons after TNF exposure and contributed to the Drp1 activation. The calcineurin inhibitor FK506 exhibited a Drp1-independent function that mitigated mitochondrial dysfunction. Finally, we found that FK506 pretreatment ameliorated the neurite growth in neurons treated with TNF and the learning ability of mice after surgery. Overall, our research indicated a crucial role of mitochondrial function in the pathological processes of POCD, and neuronal metabolic modulation may represent a novel and important target for POCD.
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Affiliation(s)
- Yan Yang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Yue Liu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Jixiang Zhu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Shiyu Song
- Center for Translational Medicine and Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu Province, 210093, China
| | - Yulin Huang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Wei Zhang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Yu'e Sun
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Jing Hao
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Xuli Yang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China
| | - Qian Gao
- Center for Translational Medicine and Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu Province, 210093, China
| | - Zhengliang Ma
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China.
| | - Juan Zhang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China.
| | - Xiaoping Gu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, 210008, China.
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Chen X, Liang J, Bin W, Luo H, Yang X. Anti-hyperlipidemic, Anti-inflammatory, and Ameliorative Effects of DRP1 Inhibition in Rats with Experimentally Induced Myocardial Infarction. Cardiovasc Toxicol 2021; 21:1000-1011. [PMID: 34472022 DOI: 10.1007/s12012-021-09691-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/17/2021] [Indexed: 10/20/2022]
Abstract
This study aims to investigate the biological role of DRP1 in myocardial infarction (MI) in concert with hyperlipidemia (HL). Based on the available literatures, 10 genes related to MI with HL (HL-MI) were screened and detected in clinical samples. High-fat diet (HFD) was used to establish HL rat models, after which the rats were subcutaneously injected with PBS or isoproterenol hydrochloride to induce acute MI. Then, rats with HL-MI were injected with pcDNA3.1, pcDNA3.1-DRP1, sh-NC, or sh-DRP1. Serum levels of total cholesterol (TC), triglycerides (TG), high-density lipoprotein-cholesterol (HDL-C), and low-density lipoprotein-cholesterol (LDL-C) were measured. Cardiac function was evaluated by detecting left ventricular fractional shortening (LVFS) and left ventricular ejection fraction (LVEF). Infarct size and histopathological changes were assessed as well as myocardial apoptosis and collagen deposition. The concentration of IL-6, IL-1β, and TNF-α in rat serum and cardiac tissues was also measured by ELISA. Mitochondrial function was shown by measuring the morphology, mitochondrial membrane potential (MMP), and intracellular reactive oxygen species (ROS) level. Pro-apoptotic proteins (Bax, caspase-1, and cleaved caspase-1) and NLRP3 inflammasome activation were also assessed. The expressions of the 10 genes were measured in clinical samples and DRP1 was selected for further experiments with significantly upregulated expression in MI patients. HFD-induced rats showed increased body weight, concurrent with higher levels of TG, TC, and LDL-C and lower HDL-C level. Compared with the BD-PBS group, the HFD-PBS group presented higher mRNA and protein expression levels of DRP1, exacerbated cardiac functions, enlarged infarct size, loss of cardiomyocytes, and disordered island cardiomyocytes. In the HL-MI rat model, injection of pcDNA3.1-DRP1 enhanced the levels of serum lipids and inflammation cytokines, induced loss of a number of cardiomyocytes and collagen deposition, and decreased LVFS and LVEF, while injection of sh-DRP1 ameliorated myocardial injuries, inflammation, and cardiomyocyte apoptosis and fibrosis. In coronary artery endothelial cells from the rats, loss of MMP was observed in the HFD-MI, LV-NC, LV-DRP1, and sh-NC groups and concomitantly, the sh-DRP1group showed increased MMP and decreased levels of mitochondrial ROS, cytochrome C, pro-apoptotic proteins, and NLRP3. Inhibition of DRP1 markedly suppressed HL, systematic inflammation, and myocardial injuries induced by HL-MI through partly restoring mitochondrial function and reducing NLRP3 expression.
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Affiliation(s)
- Xiehui Chen
- Shenzhen Longhua District Central Hospital (The Affiliated Central Hospital of Shenzhen Longhua District, Guangdong Medical University), Shenzhen, 518110, Guangdong, People's Republic of China.
| | - Jinjie Liang
- Department of Geriatrics Cardiovascular Medicine, Fuwai Hospital Chinese Academy of Medical Sciences, No. 12, Langshan Road, Nanshan District, Shenzhen, 518112, Guangdong, People's Republic of China
| | - Wugang Bin
- Department of Geriatrics Cardiovascular Medicine, Fuwai Hospital Chinese Academy of Medical Sciences, No. 12, Langshan Road, Nanshan District, Shenzhen, 518112, Guangdong, People's Republic of China
| | - Hongmin Luo
- Shenzhen RealOmics (Biotech) Co., Ltd., Shenzhen, 518081, Guangdong, People's Republic of China
| | - Xu Yang
- Shenzhen RealOmics (Biotech) Co., Ltd., Shenzhen, 518081, Guangdong, People's Republic of China
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Song H, Polster BM, Thompson LP. Chronic hypoxia alters cardiac mitochondrial complex protein expression and activity in fetal guinea pigs in a sex-selective manner. Am J Physiol Regul Integr Comp Physiol 2021; 321:R912-R924. [PMID: 34730023 PMCID: PMC8714812 DOI: 10.1152/ajpregu.00004.2021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 10/22/2021] [Accepted: 10/22/2021] [Indexed: 11/22/2022]
Abstract
We hypothesize that intrauterine hypoxia (HPX) alters the mitochondrial phenotype in fetal hearts contributing to developmental programming. Pregnant guinea pigs were exposed to normoxia (NMX) or hypoxia (HPX, 10.5% O2), starting at early [25 days (25d), 39d duration] or late gestation (50d, 14d duration). Near-term (64d) male and female fetuses were delivered by hysterotomy from anesthetized sows, and body/organ weights were measured. Left ventricles of fetal hearts were excised and frozen for measurement of expression of complex (I-V) subunits, fusion (Mfn2/OPA1) and fission (DRP1/Fis1) proteins, and enzymatic rates of I and IV from isolated mitochondrial proteins. Chronic HPX decreased fetal body weight and increased relative placenta weight regardless of timing. Early-onset HPX increased I, III, and V subunit levels, increased complex I but decreased IV activities in males but not females (all P < 0.05). Late-onset HPX decreased (P < 0.05) I, III, and V levels in both sexes but increased I and decreased IV activities in males only. Both HPX conditions decreased cardiac mitochondrial DNA content in males only. Neither early- nor late-onset HPX had any effect on Mfn2 levels but increased OPA1 in both sexes. Both HPX treatments increased DRP1/Fis1 levels in males. In females, early-onset HPX increased DRP1 with no effect on Fis1, whereas late-onset HPX increased Fis1 with no effect on DRP1. We conclude that both early- and late-onset HPX disrupts the expression/activities of select complexes that could reduce respiratory efficiency and shifts dynamics toward fission in fetal hearts. Thus, intrauterine HPX disrupts the mitochondrial phenotype predominantly in male fetal hearts, potentially altering cardiac metabolism and predisposing the offspring to heart dysfunction.
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Affiliation(s)
- Hong Song
- Department of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, University of Maryland, Baltimore, Maryland
| | - Brian M Polster
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, Maryland
| | - Loren P Thompson
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, Maryland
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50
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Zhang K, Guo MY, Li QG, Wang XH, Wan YY, Yang ZJ, He M, Yi YM, Jiang LP, Qu XH, Han XJ. Drp1-dependent mitochondrial fission mediates corneal injury induced by alkali burn. Free Radic Biol Med 2021; 176:149-161. [PMID: 34562609 DOI: 10.1016/j.freeradbiomed.2021.09.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/04/2021] [Accepted: 09/20/2021] [Indexed: 12/11/2022]
Abstract
Corneal alkali burn, one of the most serious ophthalmic emergencies, is difficult to be cured by conservative treatments. It is well known that oxidative stress, inflammation and neovascularization are the main causes of corneal damage after alkali burn, but its underlying mechanism remains to be elucidated. Here, we reported that the expression and phosphorylation (Ser616) of mitochondrial fission protein Drp1 were up-regulated at day 3 after alkali burn, while mitochondrial fusion protein Mfn2 was down-regulated. The phosphorylation of ERK1/2 in corneas was increased at day 1, 3, 7 and peaked at day 3 after alkali burn. In human corneal epithelial cells (HCE-2), NaOH treatment induced mitochondrial fission, intracellular ROS production and mitochondrial membrane potential disruption, which was prevented by Drp1 inhibitor Mdivi-1. In corneas, Mdivi-1 or knockdown of Drp1 by Lenti-Drp1 shRNA attenuated alkali burn-induced ROS production and phosphorylation of IκBα and p65. In immunofluorescence staining, it was detected that Mdivi-1 also prevented NaOH-induced nuclear translocation of p65 in HCE-2 cells. Moreover, the expression of NADPH oxidase NOX2 and NOX4 in corneas peaked at day 7 after alkali burn. Mdivi-1, Lenti-Drp1 shRNA or the mitochondria-targeted antioxidant mito-TEMPO efficiently alleviated activation of NF-κB, expression of NOX2/4 and inflammatory cytokines including IL-6, IL-1β and TNF-α in corneas after alkali burn. In pharmacological experiments, both Mdivi-1 and NADPH oxidases inhibitor Apocynin protected the corneas against alkali burn-induced neovascularization. Intriguingly, the combined administration of Mdivi-1 and Apocynin had a synergistic inhibitory effect on corneal neovascularization after alkali burn. Taken together, these results indicate that Drp1-dependent mitochondrial fission is involved in alkali burn-induced corneal injury through regulating oxidative stress, inflammatory responses and corneal neovascularization. This might provide a novel therapeutic target for corneal injury after alkali burn in the future.
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Affiliation(s)
- Kun Zhang
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Research Institute of Ophthalmology and Visual Sciences, Affiliated Eye Hospital of Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Miao-Yu Guo
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Ophthalmology, Kaifeng Eye Hospital of Kaifeng Central Hospital, Kaifeng, Henan, 475000, PR China
| | - Qiu-Gen Li
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Xiao-Hua Wang
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Yu-Ying Wan
- Department of Intra-hospital Infection Management, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Zhang-Jian Yang
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmaceutical Science, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Min He
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Neurology, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Yun-Min Yi
- Research Institute of Ophthalmology and Visual Sciences, Affiliated Eye Hospital of Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Li-Ping Jiang
- Department of Pharmacology, School of Pharmaceutical Science, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Xin-Hui Qu
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Neurology, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China.
| | - Xiao-Jian Han
- Institute of Geriatrics, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Neurology, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi, 330006, PR China.
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