1
|
Nag N, Ray T, Tapader R, Gope A, Das R, Mahapatra E, Saha S, Pal A, Prasad P, Pal A. Metallo-protease Peptidase M84 from Bacillusaltitudinis induces ROS-dependent apoptosis in ovarian cancer cells by targeting PAR-1. iScience 2024; 27:109828. [PMID: 38799586 PMCID: PMC11126781 DOI: 10.1016/j.isci.2024.109828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 01/02/2024] [Accepted: 04/24/2024] [Indexed: 05/29/2024] Open
Abstract
We have purified Peptidase M84 from Bacillus altitudinis in an effort to isolate anticancer proteases from environmental microbial isolates. This metallo-protease had no discernible impact on normal cell survival, but it specifically induced apoptosis in ovarian cancer cells. PAR-1, a GPCR which is reported to be overexpressed in ovarian cancer cells, was identified as a target of Peptidase M84. We observed that Peptidase M84 induced PAR-1 overexpression along with activating its downstream signaling effectors NF-κB and MAPK to promote excessive reactive oxygen species (ROS) generation. This evoked apoptotic death of the ovarian cancer cells through the intrinsic route. In in vivo set-up, weekly intraperitoneal administration of Peptidase M84 in syngeneic mice significantly diminished ascites accumulation, increasing murine survival rates by 60%. Collectively, our findings suggested that Peptidase M84 triggered PAR-1-mediated oxidative stress to act as an apoptosis inducer. This established Peptidase M84 as a drug candidate for receptor mediated targeted-therapy of ovarian cancer.
Collapse
Affiliation(s)
- Niraj Nag
- Division of Molecular Pathophysiology, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Tanusree Ray
- Division of Molecular Pathophysiology, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Rima Tapader
- Division of Molecular Pathophysiology, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Animesh Gope
- Division of Clinical Medicine, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Rajdeep Das
- Molecular Cell Biology of Autophagy Lab, The Francis Crick Institute, 1, Midland Road, London NW1 1AT, UK
| | - Elizabeth Mahapatra
- Department of Environmental Carcinogenesis and Toxicology, Chittaranjan National Cancer Institute, 37, S.P. Mukherjee Road, Kolkata, West Bengal 700026, India
| | - Saibal Saha
- Division of Molecular Pathophysiology, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Ananda Pal
- Division of Clinical Medicine, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| | - Parash Prasad
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital and Medical Center, 3333 Burnet Avenue, Cincinnati 45229-3026, OH, USA
| | - Amit Pal
- Division of Molecular Pathophysiology, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), P-33, CIT Road, Scheme-XM, Beliaghata, Kolkata, West Bengal 700010, India
| |
Collapse
|
2
|
Baron KR, Oviedo S, Krasny S, Zaman M, Aldakhlallah R, Mathur P, Pfeffer G, Bollong MJ, Shutt T, Grotjahn DA, Wiseman RL. Pharmacologic Activation of Integrated Stress Response Kinases Inhibits Pathologic Mitochondrial Fragmentation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.10.598126. [PMID: 38915623 PMCID: PMC11195119 DOI: 10.1101/2024.06.10.598126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Excessive mitochondrial fragmentation is associated with the pathologic mitochondrial dysfunction implicated in the pathogenesis of etiologically-diverse diseases, including many neurodegenerative disorders. The integrated stress response (ISR) - comprising the four eIF2α kinases PERK, GCN2, PKR, and HRI - is a prominent stress-responsive signaling pathway that regulates mitochondrial morphology and function in response to diverse types of pathologic insult. This suggests that pharmacologic, stress-independent activation of the ISR represents a potential strategy to mitigate pathologic mitochondrial fragmentation associated with human disease. Here, we show that pharmacologic, stress-independent activation of the ISR kinases HRI or GCN2 promotes adaptive mitochondrial elongation and prevents mitochondrial fragmentation induced by the calcium ionophore ionomycin. Further, we show that stress-independent activation of these ISR kinases reduces mitochondrial fragmentation and restores basal mitochondrial morphology in patient fibroblasts expressing the pathogenic D414V variant of the pro-fusion mitochondrial GTPase MFN2 associated with neurological dysfunctions including ataxia, optic atrophy, and sensorineural hearing loss. These results identify pharmacologic, stress-independent activation of ISR kinases as a potential strategy to prevent pathologic mitochondrial fragmentation induced by disease-relevant chemical and genetic insults, further motivating the pursuit of highly selective ISR kinase-activating compounds as a therapeutic strategy to mitigate mitochondrial dysfunction implicated in diverse human diseases.
Collapse
Affiliation(s)
- Kelsey R. Baron
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
- These authors contributed equally
| | - Samantha Oviedo
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
- Department of Integrative Structural and Computation Biology, The Scripps Research Institute, La Jolla, CA 92037
- These authors contributed equally
| | - Sophia Krasny
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
| | - Mashiat Zaman
- Department of Biochemistry and Molecular Biology, Cummings School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Rama Aldakhlallah
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
| | - Prakhyat Mathur
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
| | - Gerald Pfeffer
- Hotchkiss Brain Institute, Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary; Alberta Child Health Research Institute, Department of Medical Genetics, Cumming School of Medicine, University of Calgary
| | - Michael J. Bollong
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Timothy Shutt
- Departments of Medical Genetics and Biochemistry & Molecular Biology, Cumming School of Medicine, Hotchkiss Brain Institute, Snyder Institute for Chronic Diseases, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Danielle A. Grotjahn
- Department of Integrative Structural and Computation Biology, The Scripps Research Institute, La Jolla, CA 92037
| | - R. Luke Wiseman
- Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, CA 92037
| |
Collapse
|
3
|
He X, Wang L, Tsang HY, Liu X, Yang X, Pu S, Guo Z, Yang C, Wu Q, Zhou Z, Cen X, Zhao H. GTPBP8 modulates mitochondrial fission through a Drp1-dependent process. J Cell Sci 2024; 137:jcs261612. [PMID: 38587461 PMCID: PMC11112121 DOI: 10.1242/jcs.261612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 03/26/2024] [Indexed: 04/09/2024] Open
Abstract
Mitochondrial fission is a tightly regulated process involving multiple proteins and cell signaling. Despite extensive studies on mitochondrial fission factors, our understanding of the regulatory mechanisms remains limited. This study shows the critical role of a mitochondrial GTPase, GTPBP8, in orchestrating mitochondrial fission in mammalian cells. Depletion of GTPBP8 resulted in drastic elongation and interconnectedness of mitochondria. Conversely, overexpression of GTPBP8 shifted mitochondrial morphology from tubular to fragmented. Notably, the induced mitochondrial fragmentation from GTPBP8 overexpression was inhibited in cells either depleted of the mitochondrial fission protein Drp1 (also known as DNM1L) or carrying mutated forms of Drp1. Importantly, downregulation of GTPBP8 caused an increase in oxidative stress, modulating cell signaling involved in the increased phosphorylation of Drp1 at Ser637. This phosphorylation hindered the recruitment of Drp1 to mitochondria, leading to mitochondrial fission defects. By contrast, GTPBP8 overexpression triggered enhanced recruitment and assembly of Drp1 at mitochondria. In summary, our study illuminates the cellular function of GTPBP8 as a pivotal modulator of the mitochondrial division apparatus, inherently reliant on its influence on Drp1.
Collapse
Affiliation(s)
- Xiumei He
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Mental Health Center and National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Liang Wang
- Mental Health Center and National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Hoi Ying Tsang
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Xiaonan Liu
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia in Katowice, Katowice 40752, Poland
| | - Xiaofeng Yang
- Mental Health Center and National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Shiming Pu
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Ziqi Guo
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Cheng Yang
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Qiong Wu
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Zuping Zhou
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
| | - Xiaobo Cen
- Mental Health Center and National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Hongxia Zhao
- School of Life Sciences, Guangxi Normal University, Guilin 541004, China
- Guangxi Universities Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin 541004, China
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| |
Collapse
|
4
|
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] [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.
Collapse
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.
| |
Collapse
|
5
|
Das R, Maity S, Das P, Kamal IM, Chakrabarti S, Chakrabarti O. CMT2A-linked MFN2 mutation, T206I promotes mitochondrial hyperfusion and predisposes cells towards mitophagy. Mitochondrion 2024; 74:101825. [PMID: 38092249 DOI: 10.1016/j.mito.2023.101825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 12/01/2023] [Accepted: 12/09/2023] [Indexed: 12/21/2023]
Abstract
Mutations in Mitofusin2 (MFN2) associated with the pathology of the debilitating neuropathy Charcot-Marie-Tooth type 2A (CMT2A) are known to alter mitochondrial morphology. Previously, such mutations have been shown to elicit two diametrically opposite phenotypes - while some mutations have been causally linked to enhanced mitochondrial fragmentation, others have been shown to induce hyperfusion. Our study identifies one such MFN2 mutant, T206I that causes mitochondrial hyperfusion. Cells expressing this MFN2 mutant have elongated and interconnected mitochondria. T206I-MFN2 mutation in the GTPase domain increases MFN2 stability and renders cells susceptible to stress. We show that cells expressing T206I-MFN2 have a higher predisposition towards mitophagy under conditions of serum starvation. We also detect increased DRP1 recruitment onto the outer mitochondrial membrane, though the total DRP1 protein level remains unchanged. Here we have characterized a lesser studied CMT2A-linked MFN2 mutant to show that its presence affects mitochondrial morphology and homeostasis.
Collapse
Affiliation(s)
- Rajdeep Das
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India; Homi Bhabha National Institute, India
| | - Sebabrata Maity
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India; Homi Bhabha National Institute, India
| | - Palamou Das
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India; Homi Bhabha National Institute, India
| | - Izaz Monir Kamal
- Structural Biology and Bioinformatics Division, CSIR Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata 700091, India; Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Saikat Chakrabarti
- Structural Biology and Bioinformatics Division, CSIR Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata 700091, India; Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Oishee Chakrabarti
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India; Homi Bhabha National Institute, India.
| |
Collapse
|
6
|
Gao J, Su HX, Li PB, Shi KN, Li HH. TCH-165 attenuates cardiac ischaemia/reperfusion injury by balancing mitochondrial dynamics via increasing proteasome activity. Eur J Pharmacol 2023; 957:176011. [PMID: 37633323 DOI: 10.1016/j.ejphar.2023.176011] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 08/13/2023] [Accepted: 08/21/2023] [Indexed: 08/28/2023]
Abstract
The proteasome is the main complex responsible for maintaining intracellular protein homeostasis, impairment of which is associated with cardiac ischaemia/reperfusion (I/R) injury. The small molecule TCH-165 has been found to activate the 20S proteasome to remove disordered proteins in multiple myeloma and glioblastoma. However, the preventive effect of TCH-165 against I/R-mediated cardiac impairment in mice remains largely unknown. Here, a cardiac I/R model was established in mice. Heart function was assessed with echocardiography. Cardiac infarction, myocyte death, and superoxide level were evaluated by 2,3,5-triphenyltetrazolium chloride (TTC)-Evans blue staining, terminal deoxynucleotidyl transferase-mediated dUTP nick and labelling (TUNEL) assay and immunostaining, respectively. Our results showed that TCH-165 treatment markedly ameliorated I/R-mediated cardiac dysfunction and decreased the infarct size, apoptosis, and superoxide levels. Mechanistically, TCH-165 increased immunoproteasome subunit expression/activity, increasing pro-fission protein dynamin-1-like protein (DNM1L, also known as DRP1) degradation and the expression of the pro-fusion proteins mitofusin 1/2 (Mfn1/2) and thereby leading to mitochondrial fission/fusion balance. In vitro experiments confirmed that inhibition of proteasome activity by epoxomicin abolished the protective effect of TCH-165 against hypoxia/reoxygenation (H/R)-induced increases in cardiomyocyte apoptosis, superoxide production and mitochondrial fission. In summary, TCH-165 is a newly discovered inducer of immunoproteasome activity that exerts a preventive effect against cardiac I/R damage by targeting Drp1 degradation, indicating that it may be as a potential therapeutic candidate for ischaemic heart disease.
Collapse
Affiliation(s)
- Jing Gao
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Worker's Stadium South Road, Beijing, 100020, China
| | - Hui-Xiang Su
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Worker's Stadium South Road, Beijing, 100020, China
| | - Pang-Bo Li
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Worker's Stadium South Road, Beijing, 100020, China
| | - Kai-Na Shi
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Worker's Stadium South Road, Beijing, 100020, China
| | - Hui-Hua Li
- Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Worker's Stadium South Road, Beijing, 100020, China.
| |
Collapse
|
7
|
Hao S, Huang H, Ma RY, Zeng X, Duan CY. Multifaceted functions of Drp1 in hypoxia/ischemia-induced mitochondrial quality imbalance: from regulatory mechanism to targeted therapeutic strategy. Mil Med Res 2023; 10:46. [PMID: 37833768 PMCID: PMC10571487 DOI: 10.1186/s40779-023-00482-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
Hypoxic-ischemic injury is a common pathological dysfunction in clinical settings. Mitochondria are sensitive organelles that are readily damaged following ischemia and hypoxia. Dynamin-related protein 1 (Drp1) regulates mitochondrial quality and cellular functions via its oligomeric changes and multiple modifications, which plays a role in mediating the induction of multiple organ damage during hypoxic-ischemic injury. However, there is active controversy and gaps in knowledge regarding the modification, protein interaction, and functions of Drp1, which both hinder and promote development of Drp1 as a novel therapeutic target. Here, we summarize recent findings on the oligomeric changes, modification types, and protein interactions of Drp1 in various hypoxic-ischemic diseases, as well as the Drp1-mediated regulation of mitochondrial quality and cell functions following ischemia and hypoxia. Additionally, potential clinical translation prospects for targeting Drp1 are discussed. This review provides new ideas and targets for proactive interventions on multiple organ damage induced by various hypoxic-ischemic diseases.
Collapse
Affiliation(s)
- Shuai Hao
- Department of Anesthesiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010 China
- Research Institute of General Surgery, Jinling Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, 210002 China
| | - He Huang
- Department of Anesthesiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010 China
| | - Rui-Yan Ma
- Department of Anesthesiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010 China
- Department of Cardiovascular Surgery, Xinqiao Hospital, Army Medical University, Chongqing, 400037 China
| | - Xue Zeng
- Department of Anesthesiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010 China
- Institute for Brain Science and Disease, Chongqing Medical University, Chongqing, 400010 China
| | - Chen-Yang Duan
- Department of Anesthesiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010 China
| |
Collapse
|
8
|
Alzaydi MM, Abdul-Salam VB, Whitwell HJ, Russomanno G, Glynos A, Capece D, Szabadkai G, Wilkins MR, Wojciak-Stothard B. Intracellular Chloride Channels Regulate Endothelial Metabolic Reprogramming in Pulmonary Arterial Hypertension. Am J Respir Cell Mol Biol 2023; 68:103-115. [PMID: 36264759 PMCID: PMC9817916 DOI: 10.1165/rcmb.2022-0111oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Mitochondrial fission and a metabolic switch from oxidative phosphorylation to glycolysis are key features of vascular pathology in pulmonary arterial hypertension (PAH) and are associated with exuberant endothelial proliferation and apoptosis. The underlying mechanisms are poorly understood. We describe the contribution of two intracellular chloride channel proteins, CLIC1 and CLIC4, both highly expressed in PAH and cancer, to mitochondrial dysfunction and energy metabolism in PAH endothelium. Pathological overexpression of CLIC proteins induces mitochondrial fragmentation, inhibits mitochondrial cristae formation, and induces metabolic shift toward glycolysis in human pulmonary artery endothelial cells, consistent with changes observed in patient-derived cells. Interactions of CLIC proteins with structural components of the inner mitochondrial membrane offer mechanistic insights. Endothelial CLIC4 excision and mitofusin 2 supplementation have protective effects in human PAH cells and preclinical PAH. This study is the first to demonstrate the key role of endothelial intracellular chloride channels in the regulation of mitochondrial structure, biogenesis, and metabolic reprogramming in expression of the PAH phenotype.
Collapse
Affiliation(s)
- Mai M. Alzaydi
- National Heart and Lung Institute,,National Center for Biotechnology, King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia
| | - Vahitha B. Abdul-Salam
- National Heart and Lung Institute,,Centre for Cardiovascular Medicine and Device Innovation, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Harry J. Whitwell
- National Phenome Centre and Imperial Clinical Phenotyping Centre, and,Section of Bioanalytical Chemistry, Division of Systems Medicine, Department of Metabolism, Digestion, and Reproduction, and
| | - Giusy Russomanno
- National Heart and Lung Institute,,Medical Research Council (MRC) Centre for Drug Safety Science, Department of Pharmacology and Therapeutics, Institute of Systems, Molecular, and Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Angelos Glynos
- Mitochondrial Biology Unit, Medical Research Council, University of Cambridge, Cambridge, United Kingdom; and
| | - Daria Capece
- Centre for Cell Signalling and Inflammation, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom
| | - Gyorgy Szabadkai
- Cell and Developmental Biology, University College London, London, United Kingdom
| | | | | |
Collapse
|
9
|
Milani M, Pihán P, Hetz C. Mitochondria-associated niches in health and disease. J Cell Sci 2022; 135:285141. [DOI: 10.1242/jcs.259634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
ABSTRACT
The appreciation of the importance of interorganelle contacts has steadily increased over the past decades. Advances in imaging, molecular biology and bioinformatic techniques allowed the discovery of new mechanisms involved in the interaction and communication between organelles, providing novel insights into the inner works of a cell. In this Review, with the mitochondria under the spotlight, we discuss the most recent findings on the mechanisms mediating the communication between organelles, focusing on Ca2+ signaling, lipid exchange, cell death and stress responses. Notably, we introduce a new integrative perspective to signaling networks that is regulated by interorganelle interactions – the mitochondria-associated niches – focusing on the link between the molecular determinants of contact sites and their functional outputs, rather than simply physical and structural communication. In addition, we highlight the neuropathological and metabolic implications of alterations in mitochondria-associated niches and outline how this concept might improve our understanding of multi-organelle interactions.
Collapse
Affiliation(s)
- Mateus Milani
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, University of Chile 1 , Santiago 8380000 , Chile
- FONDAP Center for Geroscience, Brain Health, and Metabolism (GERO) 2 , Santiago 7750000 , Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile 3 , Santiago 8380000 , Chile
| | - Philippe Pihán
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, University of Chile 1 , Santiago 8380000 , Chile
- FONDAP Center for Geroscience, Brain Health, and Metabolism (GERO) 2 , Santiago 7750000 , Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile 3 , Santiago 8380000 , Chile
| | - Claudio Hetz
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, University of Chile 1 , Santiago 8380000 , Chile
- FONDAP Center for Geroscience, Brain Health, and Metabolism (GERO) 2 , Santiago 7750000 , Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile 3 , Santiago 8380000 , Chile
- Buck Institute for Research on Aging 4 , Novato, CA 94945 , USA
| |
Collapse
|
10
|
Das R, Das S, Chakrabarti S, Chakrabarti O. CMT2A-linked mitochondrial hyperfusion-driving mutant MFN2 perturbs ER-mitochondrial associations and Ca 2+ homeostasis. Biol Cell 2022; 114:309-319. [PMID: 35924634 DOI: 10.1111/boc.202100098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 06/15/2022] [Accepted: 06/17/2022] [Indexed: 11/27/2022]
Abstract
Mitofusin2 (MFN2), an important molecular player that regulates mitochondrial fusion, also helps maintain the inter-organellar contact sites, referred as mitochondria associated membranes (MAMs) that exist between the ER and mitochondria. Here we show that a mutant of MFN2, R364W-MFN2, linked with the Charcot Marie Tooth disease, promotes mitochondrial hyperfusion, alters ER mitochondrial associations at the MAM junctions and perturbs inter-organellar calcium homeostasis. Such hyperfused mitochondria are also predisposed towards stress and undergo rapid fission upon induction of mild stress. Thus, here we report that presence of the R364W-MFN2 mutation makes cells susceptible towards stress, thus negatively affecting cellular health. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Rajdeep Das
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India.,Homi Bhabha, National Institute
| | - Subhrangshu Das
- Structural Biology and Bioinformatics Division, CSIR Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata, 700091, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Saikat Chakrabarti
- Structural Biology and Bioinformatics Division, CSIR Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata, 700091, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Oishee Chakrabarti
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India.,Homi Bhabha, National Institute
| |
Collapse
|
11
|
Zaman M, Shutt TE. The Role of Impaired Mitochondrial Dynamics in MFN2-Mediated Pathology. Front Cell Dev Biol 2022; 10:858286. [PMID: 35399520 PMCID: PMC8989266 DOI: 10.3389/fcell.2022.858286] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 03/07/2022] [Indexed: 12/17/2022] Open
Abstract
The Mitofusin 2 protein (MFN2), encoded by the MFN2 gene, was first described for its role in mediating mitochondrial fusion. However, MFN2 is now recognized to play additional roles in mitochondrial autophagy (mitophagy), mitochondrial motility, lipid transfer, and as a tether to other organelles including the endoplasmic reticulum (ER) and lipid droplets. The tethering role of MFN2 is an important mediator of mitochondrial-ER contact sites (MERCs), which themselves have many important functions that regulate mitochondria, including calcium homeostasis and lipid metabolism. Exemplifying the importance of MFN2, pathogenic variants in MFN2 are established to cause the peripheral neuropathy Charcot-Marie-Tooth Disease Subtype 2A (CMT2A). However, the mechanistic basis for disease is not clear. Moreover, additional pathogenic phenotypes such as lipomatosis, distal myopathy, optic atrophy, and hearing loss, can also sometimes be present in patients with CMT2A. Given these variable patient phenotypes, and the many cellular roles played by MFN2, the mechanistic underpinnings of the cellular impairments by which MFN2 dysfunction leads to disease are likely to be complex. Here, we will review what is known about the various functions of MFN2 that are impaired by pathogenic variants causing CMT2A, with a specific emphasis on the ties between MFN2 variants and MERCs.
Collapse
Affiliation(s)
- Mashiat Zaman
- Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, AB, Canada
- Alberta Children’s Hospital Research Institute (ACHRI), Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Timothy E. Shutt
- Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, AB, Canada
- Alberta Children’s Hospital Research Institute (ACHRI), Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
- Department of Medical Genetics, University of Calgary, Calgary, AB, Canada
- *Correspondence: Timothy E. Shutt,
| |
Collapse
|
12
|
First person – Rajdeep Das. J Cell Sci 2022. [DOI: 10.1242/jcs.259717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
ABSTRACT
First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Rajdeep Das is first author on ‘ MITOL-mediated DRP1 ubiquitylation and degradation promotes mitochondrial hyperfusion in a CMT2A-linked MFN2 mutant’, published in JCS. Rajdeep is a senior research fellow in the lab of Professor Oishee Chakrabarti at the Saha Institute of Nuclear Physics, Kolkata, India, investigating mitochondrial dynamics and cellular trafficking.
Collapse
|