1
|
Kaczmarek MP. Heterogenous circulating miRNA changes in ME/CFS converge on a unified cluster of target genes: A computational analysis. PLoS One 2023; 18:e0296060. [PMID: 38157384 PMCID: PMC10756525 DOI: 10.1371/journal.pone.0296060] [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: 05/08/2023] [Accepted: 12/02/2023] [Indexed: 01/03/2024] Open
Abstract
Myalgic Encephalomyelitis / Chronic Fatigue Syndrome is a debilitating, multisystem disease of unknown mechanism, with a currently ongoing search for its endocrine mediators. Circulating microRNAs (miRNA) are a promising candidate for such a mediator and have been reported as significantly different in the patient population versus healthy controls by multiple studies. None of these studies, however, agree with each other on which specific miRNA are under- or over-expressed. This discrepancy is the subject of the computational study presented here, in which a deep dive into the predicted gene targets and their functional interactions is conducted, revealing that the aberrant circulating miRNAs in ME/CFS, although different between patients, seem to mainly target the same specific set of genes (p ≈ 0.0018), which are very functionally related to each other (p ≲ 0.0001). Further analysis of these functional relations, based on directional pathway information, points to impairments in exercise hyperemia, angiogenic adaptations to hypoxia, antioxidant defenses, and TGF-β signaling, as well as a shift towards mitochondrial fission, corroborating and explaining previous direct observations in ME/CFS. Many transcription factors and epigenetic modulators are implicated as well, with currently uncertain downstream combinatory effects. As the results show significant similarity to previous research on latent herpesvirus involvement in ME/CFS, the possibility of a herpesvirus origin of these miRNA changes is also explored through further computational analysis and literature review, showing that 8 out of the 10 most central miRNAs analyzed are known to be upregulated by various herpesviruses. In total, the results establish an appreciable and possibly central role for circulating microRNAs in ME/CFS etiology that merits further experimental research.
Collapse
|
2
|
Lei Y, Klionsky DJ. Transcriptional regulation of autophagy and its implications in human disease. Cell Death Differ 2023; 30:1416-1429. [PMID: 37045910 PMCID: PMC10244319 DOI: 10.1038/s41418-023-01162-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 04/14/2023] Open
Abstract
Macroautophagy/autophagy is a conserved catabolic pathway that is vital for maintaining cell homeostasis and promoting cell survival under stressful conditions. Dysregulation of autophagy is associated with a variety of human diseases, such as cancer, neurodegenerative diseases, and metabolic disorders. Therefore, this pathway must be precisely regulated at multiple levels, involving epigenetic, transcriptional, post-transcriptional, translational, and post-translational mechanisms, to prevent inappropriate autophagy activity. In this review, we focus on autophagy regulation at the transcriptional level, summarizing the transcription factors that control autophagy gene expression in both yeast and mammalian cells. Because the expression and/or subcellular localization of some autophagy transcription factors are altered in certain diseases, we also discuss how changes in transcriptional regulation of autophagy are associated with human pathophysiologies.
Collapse
Affiliation(s)
- Yuchen Lei
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Daniel J Klionsky
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.
| |
Collapse
|
3
|
Luo L, Zhu J, Guo Y, Li C. Mitophagy and immune infiltration in vitiligo: evidence from bioinformatics analysis. Front Immunol 2023; 14:1164124. [PMID: 37287971 PMCID: PMC10242039 DOI: 10.3389/fimmu.2023.1164124] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/11/2023] [Indexed: 06/09/2023] Open
Abstract
Background Vitiligo is an acquired, autoimmune, depigmented skin disease with unclear pathogenesis. Mitochondrial dysfunction contributes significantly to vitiligo, and mitophagy is vital for removing damaged mitochondria. Herein, using bioinformatic analysis, we sought to determine the possible role of mitophagy-associated genes in vitiligo and immune infiltration. Methods Microarrays GSE53146 and GSE75819 were used to identify differentially expressed genes (DEGs) in vitiligo. By crossing vitiligo DEGs with mitophagy-related genes, the mitophagy-related DEGs were identified. Functional enrichment and protein-protein intersection (PPI) analyses were conducted. Then, the hub genes were identified using two machine algorithms, and receiver operating characteristic (ROC) curves were generated. Next, the immune infiltration and its connection with hub genes in vitiligo were investigated. Finally, the Regnetwork database and NetworkAnalyst were used to predict the upstream transcriptional factors (TFs), microRNAs (miRNAs), and the protein-compound network. Results A total of 24 mitophagy-related genes were screened. Then, five mitophagy hub genes (GABARAPL2, SP1, USP8, RELA, and TBC1D17) were identified using two machine learning algorithms, and these genes showed high diagnostic specificity for vitiligo. The PPI network showed that hub genes interacted with each other. The mRNA expression levels of five hub genes were validated in vitiligo lesions by qRT-PCR and were compatible with the bioinformatic results. Compared with controls, the abundance of activated CD4+ T cells, CD8+ T cells, immature dendritic cells and B cells, myeloid-derived suppressor cells (MDSCs), gamma delta T cells, mast cells, regulatory T cells (Tregs), and T helper 2 (Th2) cells was higher. However, the abundance of CD56 bright natural killer (NK) cells, monocytes, and NK cells was lower. Correlation analysis revealed a link between hub genes and immune infiltration. Meanwhile, we predicted the upstream TFs and miRNAs and the target compounds of hub genes. Conclusion Five hub mitophagy-related genes were identified and correlated with immune infiltration in vitiligo. These findings suggested that mitophagy may promote the development of vitiligo by activating immune infiltration. Our study might enhance our comprehension of the pathogenic mechanism of vitiligo and offer a treatment option for vitiligo.
Collapse
Affiliation(s)
- Lingling Luo
- Department of Dermatology, Hospital for Skin Disease, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Jing Zhu
- Department of Dermatology, Hospital for Skin Disease, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Youming Guo
- Department of Dermatology, Hospital for Skin Disease, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Chengrang Li
- Department of Dermatology, Hospital for Skin Disease, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
- Department of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Nanjing, Jiangsu, China
| |
Collapse
|
4
|
Xu X, Wang X, Chen Q, Zheng A, Li D, Meng Z, Li X, Cai H, Li W, Huang S, Wang F. Sp1 promotes tumour progression by remodelling the mitochondrial network in cervical cancer. J Transl Med 2023; 21:307. [PMID: 37147632 PMCID: PMC10163764 DOI: 10.1186/s12967-023-04141-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 04/17/2023] [Indexed: 05/07/2023] Open
Abstract
BACKGROUND Cervical cancer remains one of the most prevalent cancers worldwide. Accumulating evidence suggests that specificity protein 1 (Sp1) plays a pivotal role in tumour progression. The underlying role and mechanism of Sp1 in tumour progression remain unclear. METHODS The protein level of Sp1 in tumour tissues was determined by immunohistochemistry. The effect of Sp1 expression on the biological characteristics of cervical cancer cells was assessed by colony, wound healing, transwell formation, EdU, and TUNEL assays. Finally, the underlying mechanisms and effects of Sp1 on the mitochondrial network and metabolism of cervical cancer were analysed both in vitro and in vivo. RESULTS Sp1 expression was upregulated in cervical cancer. Sp1 knockdown suppressed cell proliferation both in vitro and in vivo, while overexpression of Sp1 had the opposite effects. Mechanistically, Sp1 facilitated mitochondrial remodelling by regulating mitofusin 1/2 (Mfn1/2), OPA1 mitochondrial dynamin-like GTPase (Opa1), and dynamin 1-like (Drp1). Additionally, the Sp1-mediated reprogramming of glucose metabolism played a critical role in the progression of cervical cancer cells. CONCLUSIONS Our study demonstrates that Sp1 plays a vital role in cervical tumorigenesis by regulating the mitochondrial network and reprogramming glucose metabolism. Targeting Sp1 could be an effective strategy for the treatment of cervical cancer.
Collapse
Affiliation(s)
- Xu Xu
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Xiaona Wang
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
| | - Qihui Chen
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Aman Zheng
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Donglu Li
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Ziqi Meng
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Xinran Li
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Hanchen Cai
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Wangzhi Li
- School of Stomatology, Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China
| | - Shiyuan Huang
- Department of Neurological Rehabilitation, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China.
| | - Fan Wang
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 109 West Xueyuan Road, Lucheng District, Wenzhou City, 325000, Zhejiang Province, China.
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou City, 325000, Zhejiang Province, China.
| |
Collapse
|
5
|
Liu P, Gao S, Li Z, Pan S, Luo G, Ji Z. Endothelial progenitor cell-derived exosomes inhibit pulmonary artery smooth muscle cell in vitro proliferation and resistance to apoptosis by modulating the Mitofusin-2 and Ras-Raf-ERK1/2 signaling pathway. Eur J Pharmacol 2023; 949:175725. [PMID: 37068578 DOI: 10.1016/j.ejphar.2023.175725] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 03/29/2023] [Accepted: 04/14/2023] [Indexed: 04/19/2023]
Abstract
Pulmonary arterial hypertension (PAH) mainly occurs as a result of abnormal proliferation and apoptosis resistance of pulmonary artery smooth muscle cells (PASMCs). Endothelial progenitor cell (EPC)-derived exosomes (Exos) (EPC-Exos) relieve PAH. However, there is still insufficient knowledge of whether EPC-Exos contribute to the pathological process of PAH, especially for PASMC repair. This study aimed to determine the effects of EPC-Exos on the proliferation, migration, and apoptosis of PASMCs and explore the possible underlying molecular mechanisms through bioinformatics analysis and in vitro testing. Bioinformatics analysis showed that the Ras signaling pathway and Exos were crucial in PAH. The PAH differential microRNAs (miRNAs) and miRNAs identified in EPC-Exos were intersected to obtain miR-21-5p. A target gene prediction program predicted mitofusin-2 (Mfn2) as a potential target of miR-21-5p. Cellular experiments demonstrated that EPC-Exos attenuated the viability, proliferation, migration, and apoptosis resistance of PASMCs under hypoxia. Mechanistically, EPC-Exos significantly upregulated Mfn2 expression and attenuated Ras-Raf-ERK1/2 signaling pathway activity. In conclusion, EPC-Exos suppress cell viability, proliferation, and migration and promote apoptosis in PASMCs under hypoxic conditions. It is possible to transport miR-21-5p to improve the expression of Mfn2 and inhibit the Ras-Raf-ERK1/2 signaling pathway directly or by targeting the expression of Mfn2. EPC-Exos are a potential therapeutic candidate for the treatment of PAH.
Collapse
Affiliation(s)
- Panpan Liu
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China
| | - Shuai Gao
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China
| | - Zhixin Li
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China
| | - Silin Pan
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China.
| | - Gang Luo
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China
| | - Zhixian Ji
- Heart center, Qingdao Women and Children's Hospital, Qingdao University, Qingdao, 266034, China
| |
Collapse
|
6
|
Fang C, Zhang X, Li C, Liu F, Liu H. Troponin C-1 Activated by E2F1 Accelerates Gastric Cancer Progression via Regulating TGF-β/Smad Signaling. Dig Dis Sci 2022; 67:4444-4457. [PMID: 34797443 DOI: 10.1007/s10620-021-07287-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 10/13/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND Troponin C-1 (TNNC1) has been previously characterized as an oncogenic gene. AIMS This study aimed to reveal the roles of TNNC1 in gastric cancer and the potential underlying mechanisms. METHODS TNNC1 siRNAs and TNNC1 overexpression plasmid were used to alter its expression in AGS, MKN45, and HGC-27 cells. CCK-8 assay, colony formation, EdU assay, flow cytometry, transwell assay, and scratch test were conducted to measure the phenotype changes. In vivo effects of TNNC1 silence were confirmed by using a xenograft mouse model. Bioinformatics analysis was conducted to screen out the transcription factor and downstream signaling of TNNC1. RESULTS TNNC1 was highly expressed in gastric cancer tissues and cell lines, and its expression was associated with poor prognosis. TNNC1 silence suppressed the proliferation, migration, and invasion of AGS and MKN45 cells. However, TNNC1 silence induced apoptosis by mediating the cleavage of caspase-3 and caspase-9. Overexpression of TNNC1 in HGC-27 cells led to the contrary effects. The anti-tumor effects of TNNC1 silence were also confirmed in a xenograft animal model. E2F1 was validated as an upstream transcription factor of TNNC1. Effects of TNNC1 silence on AGS cell migration and invasion were attenuated by E2F1 overexpression. Besides, TGF-β/Smad was a downstream signaling pathway of TNNC1. The anti-tumor impacts of TNNC1 silence were weaken by SB431542 (a specific inhibitor of TGF-β signaling) while accelerated by TGF-β. CONCLUSION TNNC1 activated by E2F1 functioned as an oncogenic gene through regulating TGF-β/Smad signaling. TNNC1 was suggested as a potential molecular drug target of gastric cancer.
Collapse
Affiliation(s)
- Can Fang
- Department of Gastroenterology, Yantai Affiliated Hospital of Binzhou Medical University, 717 Jinbu Street, Muping District, Yantai, 264100, Shandong, People's Republic of China
| | - Xinxin Zhang
- Department of Gastroenterology, Yantai Affiliated Hospital of Binzhou Medical University, 717 Jinbu Street, Muping District, Yantai, 264100, Shandong, People's Republic of China
| | - Chengyan Li
- Department of Digestive Endoscopy Room, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, 264100, Shandong, People's Republic of China
| | - Fang Liu
- Department of Gastroenterology, Yantai Affiliated Hospital of Binzhou Medical University, 717 Jinbu Street, Muping District, Yantai, 264100, Shandong, People's Republic of China
| | - Hui Liu
- Department of Gastroenterology, Yantai Affiliated Hospital of Binzhou Medical University, 717 Jinbu Street, Muping District, Yantai, 264100, Shandong, People's Republic of China.
| |
Collapse
|
7
|
Zhang WB, Feng SY, Xiao ZX, Qi YF, Zeng ZF, Chen H. Down-regulating of MFN2 promotes vascular calcification via regulating RAS-RAF-ERK1/2 pathway. Int J Cardiol 2022; 366:11-18. [PMID: 35716948 DOI: 10.1016/j.ijcard.2022.06.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 04/07/2022] [Accepted: 06/10/2022] [Indexed: 12/28/2022]
Abstract
BACKGROUND Vascular calcification (VC), as a prevalent feature of atherosclerosis (AS), is a life-threatening pathological change. Mitofusin 2 (MFN2) has been reported to be down-regulated and participate in the pathogenesis of AS. Here, we explored the feasible impacts of MFN2 on VC in AS. METHODS Atherosclerotic lesion was evaluated by Oil Red O staining. The VC was detected by Alizarin Red S staining, ALP staining, and calcium content in vascular smooth muscle cells (VSMCs) or atherosclerotic mice. The chondrocyte differentiation of VSMCs was measured by Alcian blue staining. Western blotting and qRT-PCR were used to determine the protein and mRNA expression of associated molecules. Intermolecular interaction was measured by ChIP and dual luciferase assays. RESULTS The expression of MFN2 and E2F1 was reduced in the aorta tissues of AS patients and mice. Silencing of MFN2 drove calcification in VSMCs and aortas of atherosclerotic mice as confirmed by up-regulating RUNX2, OPG levels, and down-regulating SM22α, α-SMA levels. The chondrocyte differentiation of VSMCs was accelerated by MFN2 knockdown through inducing the expression of Aggrecan, Collagen II, and SOX9. In addition, E2F1 promoted the transcription and expression of MFN2 in VSMCs. Overexpression of MFN2 or E2F1 suppressed ox-LDL-induced VSMC calcification. Finally, MFN2 depletion enhanced VSMC calcification via activating RAS-RAF-ERK1/2 pathway. CONCLUSION Our results suggest that silencing of MFN2 drives VC via activating RAS-RAF-ERK1/2 pathway in the progression of AS, thus MFN2 may be a therapeutic target for AS.
Collapse
Affiliation(s)
- Wen-Bo Zhang
- Department of Vascular Surgery, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China.
| | - Si-Yi Feng
- Department of Ultrasound Medicine, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China
| | - Zhan-Xiang Xiao
- Department of Vascular Surgery, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China
| | - You-Fei Qi
- Department of Vascular Surgery, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China
| | - Zhao-Fan Zeng
- Department of Vascular Surgery, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China
| | - Hao Chen
- Department of Vascular Surgery, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou 570311, Hainan Province, PR China
| |
Collapse
|
8
|
LARS2 Regulates Apoptosis via ROS-Mediated Mitochondrial Dysfunction and Endoplasmic Reticulum Stress in Ovarian Granulosa Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:5501346. [PMID: 35585880 PMCID: PMC9110257 DOI: 10.1155/2022/5501346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 03/23/2022] [Indexed: 02/06/2023]
Abstract
Several studies have indicated that mutations of LARS2 are associated with premature ovarian insufficiency (POI). However, the pathogenic mechanism of LARS2 in POI has not been reported yet. In the present study, the expression levels of LARS2 and E2F1 in granulosa cells (GCs) of POI patients were examined. CCK-8 and Edu assay were performed to determine the effect of LARS2 on cell proliferation. Apoptosis rate, mitochondrial membrane potential, reactive oxygen species (ROS), and cytoplasm Ca2+ levels were analyzed by flow cytometry. Western blot was conducted to evaluate the expression level of genes affected by LARS2. Transmission electron microscopy (TEM) was used to observe mitochondrial structure in GCs. Chromatin immunoprecipitation (ChIP) was used to evaluate the regulatory effect of E2F1 on Mfn-2 expression. Our results showed that LARS2 expression was downregulated in GCs of POI patients. Silencing of LARS2 inhibited cell proliferation and promoted the apoptosis of GCs. Meanwhile, LARS2 knockdown could induce mitochondrial dysfunction and accumulation of ROS levels. Moreover, ROS was found to be involved in the antiproliferation, proapoptotic, and endoplasmic reticulum (ER) stress effects of LARS2 knockdown. Furthermore, we also found that the expression level of E2F1 was positively correlated with LARS2. In addition, E2F1 could bind at the -61/-46 region of Mfn-2 promoter and regulated MFN-2 transcription. These findings demonstrated that LARS2 could promote the expression of E2F1. E2F1 mediated the effect of LARS2 on Mfn-2 expression via targeting the promoter region of Mfn-2, in which subsequently regulated cell proliferation and apoptosis, which resulted in the etiology of POI. This study will provide useful information for further investigations on the LARS2 in the occurrence of POI.
Collapse
|
9
|
Wang H, Yi X, Guo S, Wang S, Ma J, Zhao T, Shi Q, Tian Y, Wang H, Jia L, Gao T, Li C, Guo W. The XBP1‒MARCH5‒MFN2 Axis Confers Endoplasmic Reticulum Stress Resistance by Coordinating Mitochondrial Fission and Mitophagy in Melanoma. J Invest Dermatol 2021; 141:2932-2943.e12. [PMID: 34048729 DOI: 10.1016/j.jid.2021.03.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/04/2021] [Accepted: 03/16/2021] [Indexed: 12/25/2022]
Abstract
Melanoma cells are relatively resistant to endoplasmic reticulum (ER) stress, which contributes to tumor progression under stressful conditions and renders tolerance to ER stress‒inducing therapeutic agents. Mitochondria are tightly interconnected with ER. However, whether mitochondria play a role in regulating ER stress resistance in melanoma remains elusive. In this study, we reported that the XBP1‒MARCH5‒MFN2 axis conferred ER stress resistance by coordinating mitochondrial fission and mitophagy in melanoma. Our integrative bioinformatics first revealed that the downregulation of mitochondrial genes was highly correlated with unfolded protein response activation in melanoma. Then we proved that mitochondrial fission and mitophagy were prominently induced to contribute to ER stress resistance both in vitro and in vivo by maintaining mitochondrial function. Mechanistically, the activation of IRE1α/ATF6-XBP1 branches of unfolded protein response promoted the transcription of E3 ligase MARCH5 to facilitate the ubiquitination and degradation of MFN2, which thereby triggered mitochondrial fission and mitophagy under ER stress. Together, our findings show a regulatory axis that links mitochondrial fission and mitophagy to the resistance to ER stress. Targeting mitochondrial quality control machinery can be exploited as an approach to reinforce the efficacy of ER stress‒inducing agents against cancer.
Collapse
Affiliation(s)
- Huina Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China; Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Sen Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Sijia Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China; Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jinyuan Ma
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Tao Zhao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Qiong Shi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yangzi Tian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Hao Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Lintao Jia
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China
| | - Tianwen Gao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Weinan Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
| |
Collapse
|
10
|
Yin Y, Tan Y, Yao Y, Lu N, Zhang F. SNHG12/miR-326/E2F1 feedback loop facilitates the progression of oral squamous cell carcinoma. Oral Dis 2020; 26:1631-1639. [PMID: 32506729 DOI: 10.1111/odi.13458] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 05/06/2020] [Accepted: 05/27/2020] [Indexed: 12/15/2022]
Abstract
Oral squamous cell carcinoma (OSCC) is a kind of common malignant tumor worldwide. An increasing number of researches have validated that long non-coding RNAs (lncRNAs) are closely associated with the occurrence and development of multiple diseases, including cancers. However, the role of lncRNA SNHG12 in OSCC was largely unknown. In present study, qRT-PCR manifested the upregulation of SNHG12 expression in OSCC tissues and cells. Suppression of SNHG12 inhibited cell proliferation, migration, invasion, and EMT process in OSCC. Additionally, SNHG12 depletion also attenuated OSCC tumor growth in vivo. Thereafter, E2F1 was found to be a transcription factor of SNHG12 to stimulate its expression. More interestingly, SNHG12 deficiency reduced E2F1 expression in turn. MiR-326 was found to be shared between SNHG12 and E2F1. Besides, SNHG12 augmented E2F1 in OSCC through miR-326 sequestration. Finally, rescue assays demonstrated that overexpressed E2F1 restored the inhibitory effect resulted from SNHG12 silence, indicating that SNHG12 promoted the progression of OSCC by E2F1-dependent way. This research unveiled that SNHG12/miR-326/E2F1 feedback loop facilitated OSCC progression, which shed new light on therapeutic methods in OSCC.
Collapse
Affiliation(s)
- Yue Yin
- Department of Stomatology, North China University of Science and Technology Affiliated Hospital, Tangshan, China
| | - Yingyun Tan
- Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Yuan Yao
- Department of Stomatology, North China University of Science and Technology Affiliated Hospital, Tangshan, China
| | - Na Lu
- Department of Stomatology, North China University of Science and Technology Affiliated Hospital, Tangshan, China
| | - Fugui Zhang
- Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| |
Collapse
|
11
|
E2F1 sumoylation as a protective cellular mechanism in oxidative stress response. Proc Natl Acad Sci U S A 2020; 117:14958-14969. [PMID: 32541040 DOI: 10.1073/pnas.1921554117] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Oxidative stress is a ubiquitous threat to all aerobic organisms and has been implicated in numerous pathological conditions such as cancer. Here we demonstrate a pivotal role for E2F1, a cell cycle regulatory transcription factor, in cell tolerance of oxidative stress. Cells lacking E2F1 are hypersensitive to oxidative stress due to the defects in cell cycle arrest. Oxidative stress inhibits E2F1 transcriptional activity, independent of changes in association with Rb and without decreasing its DNA-binding activity. Upon oxidative insult, SUMO2 is extensively conjugated to E2F1 mainly at lysine 266 residue, which specifically modulates E2F1 transcriptional activity to enhance cell cycle arrest for cell survival. We identify SENP3, a desumoylating enzyme, as an E2F1-interacting partner. Oxidative stress inhibits the interaction between E2F1 and SENP3, which leads to accumulation of sumoylated E2F1. SENP3-deficient cells exhibit hypersumoylation of E2F1 and are resistant to oxidative insult. High levels of SENP3 in breast cancer are associated with elevated levels of E2F targets, high tumor grade, and poor survival. Given the prevalence of elevated levels of SENP3 across numerous cancer types, the SENP3-E2F1 axis may serve as an avenue for therapeutic intervention in cancer.
Collapse
|
12
|
Inhibition of Kv10.1 Channels Sensitizes Mitochondria of Cancer Cells to Antimetabolic Agents. Cancers (Basel) 2020; 12:cancers12040920. [PMID: 32283712 PMCID: PMC7226288 DOI: 10.3390/cancers12040920] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 04/01/2020] [Indexed: 12/12/2022] Open
Abstract
Reprogramming of energy metabolism constitutes one of the hallmarks of cancer and is, therefore, an emerging therapeutic target. We describe here that the potassium channel Kv10.1, which is frequently overexpressed in primary and metastatic cancer, and has been proposed a therapeutic target, participates in metabolic adaptation of cancer cells through regulation of mitochondrial dynamics. We used biochemical and cell biological techniques, live cell imaging and high-resolution microscopy, among other approaches, to study the impact of Kv10.1 on the regulation of mitochondrial stability. Inhibition of Kv10.1 expression or function led to mitochondrial fragmentation, increase in reactive oxygen species and increased autophagy. Cells with endogenous overexpression of Kv10.1 were also more sensitive to mitochondrial metabolism inhibitors than cells with low expression, indicating that they are more dependent on mitochondrial function. Consistently, a combined therapy using functional monoclonal antibodies for Kv10.1 and mitochondrial metabolism inhibitors resulted in enhanced efficacy of the inhibitors. Our data reveal a new mechanism regulated by Kv10.1 in cancer and a novel strategy to overcome drug resistance in cancers with a high expression of Kv10.1.
Collapse
|
13
|
Shen C, Chen X, Xiao K, Che G. New relationship of E2F1 and BNIP3 with caveolin-1 in lung cancer-associated fibroblasts. Thorac Cancer 2020; 11:1369-1371. [PMID: 32212370 PMCID: PMC7262894 DOI: 10.1111/1759-7714.13408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 03/06/2020] [Indexed: 02/05/2023] Open
Abstract
In recent years, studies have found that E2F1, a downstream effector of caveolin‐1 (Cav‐1), participates in tumor cell metabolic reprogramming. E2F1 modulates mitochondrial fusion and mitophagy. Bioinformatic analysis has identified the E2F1‐MFN2 axis as a regulator of mitophagy. Our data establish a new novel paradigm for regulation of the tumor cell metabolic reprogramming pathway by Cav‐1 that is operationally linked and mutually dependent on the transcriptional activation of E2F1 and induces mitophagy with BNIP3 in cancer‐associated fibroblasts (CAFs).
Collapse
Affiliation(s)
- Cheng Shen
- Department of Thoracic Surgery, West-China Hospital, Sichuan University, Chengdu, China
| | - Xuanming Chen
- School of Medicine, West-China Hospital, Sichuan University, Chengdu, China.,Sichuan Kangcheng Biotechnology Co., Ltd., Chengdu, China
| | - Kai Xiao
- School of Medicine, West-China Hospital, Sichuan University, Chengdu, China.,Sichuan Kangcheng Biotechnology Co., Ltd., Chengdu, China
| | - Guowei Che
- Department of Thoracic Surgery, West-China Hospital, Sichuan University, Chengdu, China
| |
Collapse
|