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Liu J, Wu Y, Meng S, Xu P, Li S, Li Y, Hu X, Ouyang L, Wang G. Selective autophagy in cancer: mechanisms, therapeutic implications, and future perspectives. Mol Cancer 2024; 23:22. [PMID: 38262996 PMCID: PMC10807193 DOI: 10.1186/s12943-024-01934-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 01/05/2024] [Indexed: 01/25/2024] Open
Abstract
Eukaryotic cells engage in autophagy, an internal process of self-degradation through lysosomes. Autophagy can be classified as selective or non-selective depending on the way it chooses to degrade substrates. During the process of selective autophagy, damaged and/or redundant organelles like mitochondria, peroxisomes, ribosomes, endoplasmic reticulum (ER), lysosomes, nuclei, proteasomes, and lipid droplets are selectively recycled. Specific cargo is delivered to autophagosomes by specific receptors, isolated and engulfed. Selective autophagy dysfunction is closely linked with cancers, neurodegenerative diseases, metabolic disorders, heart failure, etc. Through reviewing latest research, this review summarized molecular markers and important signaling pathways for selective autophagy, and its significant role in cancers. Moreover, we conducted a comprehensive analysis of small-molecule compounds targeting selective autophagy for their potential application in anti-tumor therapy, elucidating the underlying mechanisms involved. This review aims to supply important scientific references and development directions for the biological mechanisms and drug discovery of anti-tumor targeting selective autophagy in the future.
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Affiliation(s)
- Jiaxi Liu
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China
| | - Yongya Wu
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China
| | - Sha Meng
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China
| | - Ping Xu
- Emergency Department, Zigong Fourth People's Hospital, Zigong, 643000, China
| | - Shutong Li
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China
| | - Yong Li
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China
| | - Xiuying Hu
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China.
| | - Liang Ouyang
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China.
| | - Guan Wang
- Innovation Center of Nursing Research, Nursing Key Laboratory of Sichuan Province, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University /West China School of Nursing, Sichuan University, Chengdu, 610041, China.
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Hill MA, Sykes AM, Mellick GD. ER-phagy in neurodegeneration. J Neurosci Res 2023; 101:1611-1623. [PMID: 37334842 DOI: 10.1002/jnr.25225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/11/2023] [Accepted: 05/31/2023] [Indexed: 06/21/2023]
Abstract
There are many cellular mechanisms implicated in the initiation and progression of neurodegenerative disorders. However, age and the accumulation of unwanted cellular products are a common theme underlying many neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and Niemann-Pick type C. Autophagy has been studied extensively in these diseases and various genetic risk factors have implicated disruption in autophagy homoeostasis as a major pathogenic mechanism. Autophagy is essential in the maintenance of neuronal homeostasis, as their postmitotic nature makes them particularly susceptible to the damage caused by accumulation of defective or misfolded proteins, disease-prone aggregates, and damaged organelles. Recently, autophagy of the endoplasmic reticulum (ER-phagy) has been identified as a novel cellular mechanism for regulating ER morphology and response to cellular stress. As neurodegenerative diseases are generally precipitated by cellular stressors such as protein accumulation and environmental toxin exposure the role of ER-phagy has begun to be investigated. In this review we discuss the current research in ER-phagy and its involvement in neurodegenerative diseases.
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Affiliation(s)
- Melissa A Hill
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | - Alex M Sykes
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | - George D Mellick
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
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Li JY, Tian T, Han B, Yang T, Guo YX, Wu JY, Chen YS, Yang Q, Xie RJ. Suberoylanilide hydroxamic acid upregulates reticulophagy receptor expression and promotes cell death in hepatocellular carcinoma cells. World J Gastroenterol 2023; 29:5038-5053. [PMID: 37753370 PMCID: PMC10518741 DOI: 10.3748/wjg.v29.i34.5038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/15/2023] [Accepted: 08/15/2023] [Indexed: 09/08/2023] Open
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is a common clinical condition with a poor prognosis and few effective treatment options. Potent anticancer agents for treating HCC must be identified. Epigenetics plays an essential role in HCC tumorigenesis. Suberoylanilide hydroxamic acid (SAHA), the most common histone deacetylase inhibitor agent, triggers many forms of cell death in HCC. However, the underlying mechanism of action remains unclear. Family with sequence similarity 134 member B (FAM134B)-induced reticulophagy, a selective autophagic pathway, participates in the decision of cell fate and exhibits anticancer activity. This study focused on the relationship between FAM134B-induced reticulophagy and SAHA-mediated cell death. AIM To elucidate potential roles and underlying molecular mechanisms of reticulophagy in SAHA-induced HCC cell death. METHODS The viability, apoptosis, cell cycle, migration, and invasion of SAHA-treated Huh7 and MHCC97L cells were measured. Proteins related to the reticulophagy pathway, mitochondria-endoplasmic reticulum (ER) contact sites, intrinsic mitochondrial apoptosis, and histone acetylation were quantified using western blotting. ER and lysosome colocalization, and mitochondrial Ca2+ levels were characterized via confocal microscopy. The level of cell death was evaluated through Hoechst 33342 staining and propidium iodide colocalization. Chromatin immunoprecipitation was used to verify histone H4 lysine-16 acetylation in the FAM134B promoter region. RESULTS After SAHA treatment, the proliferation of Huh7 and MHCC97L cells was significantly inhibited, and the migration and invasion abilities were greatly blocked in vitro. This promoted apoptosis and caused G1 phase cells to increase in a concentration-dependent manner. Following treatment with SAHA, ER-phagy was activated, thereby triggering autophagy-mediated cell death of HCC cells in vitro. Western blotting and chromatin immunoprecipitation assays confirmed that SAHA regulated FAM134B expression by enhancing the histone H4 lysine-16 acetylation in the FAM134B promoter region. Further, SAHA disturbed the Ca2+ homeostasis and upregulated the level of autocrine motility factor receptor and proteins related to mitochondria-endoplasmic reticulum contact sites in HCC cells. Additionally, SAHA decreased the mitochondrial membrane potential levels, thereby accelerating the activation of the reticulophagy-mediated mitochondrial apoptosis pathway and promoting HCC cell death in vitro. CONCLUSION SAHA stimulates FAM134B-mediated ER-phagy to synergistically enhance the mitochondrial apoptotic pathway, thereby enhancing HCC cell death.
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Affiliation(s)
- Jia-Yao Li
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Tian Tian
- Department of Eugenic Genetics, Guiyang Maternal and Child Health Care Hospital, Guiyang 550003, Guizhou Province, China
| | - Bing Han
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Ting Yang
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Yi-Xin Guo
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Jia-Yu Wu
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Yu-Si Chen
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Qin Yang
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
| | - Ru-Jia Xie
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
- Department of Pathophysiology, College of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
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Kanamori A, Hinaga S, Hirata Y, Amaya F, Oh-Hashi K. Molecular characterization of wild-type and HSAN2B-linked FAM134B. Mol Biol Rep 2023:10.1007/s11033-023-08517-y. [PMID: 37273064 DOI: 10.1007/s11033-023-08517-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 05/11/2023] [Indexed: 06/06/2023]
Abstract
BACKGROUND Family with sequence similarity 134, member B (FAM134B), also known as Reticulophagy regulator 1 (RETREG1), is an ER-phagy receptor involved in ER homeostasis. Congenital mutations in the FAM134B gene have been reported to be associated with hereditary sensory and autonomic neuropathy type 2B (HSAN2B); however, the molecular differences between wild-type and HSAN2B-linked FAM134B are not fully understood. METHODS AND RESULTS We prepared several human FAM134B constructs, such as the HSAN2B-linked mutant, and compared their features with those of wild-type FAM134B by transfecting these constructs into FAM134B-deficient Neuro2a cells. Although intrinsic FAM134B protein expression in wild-type Neuro2a cells was affected by the supply of amino acids in the culture medium, the expression of each HSAN2B-linked mutant FAM134B protein was hardly affected by serum and amino acid deprivation. On the other hand, the intracellular localization of GFP-tagged HSAN2B-linked mutants, except for P7Gfs133X, overlapped well with ER-localized SP-RFPKDEL and did not differ from that of GFP-tagged wild-type FAM134B. However, analysis of protein‒protein interactions using the NanoBiT reporter assay revealed the difference between wild-type and C-terminal truncated mutant FAM134B. Furthermore, this NanoBiT assay demonstrated that both wild-type and G216R FAM134B interacted with LC3/GABARAPL1 to the same extent, but the FAM134B construct with mutations near the LC3-interacting region (LIR) did not. Similar to the NanoBiT assay, the C-terminal-truncated FAM134B showed lower ER-phagy activities, as assessed by the cotransfection of GFP-tagged reporters. CONCLUSIONS We showed that wild-type and HSAN2B-linked FAM134B have different molecular characteristics by transfecting cells with various types of constructs. Thus, this study provides new insights into the molecular mechanisms underlying HSAN2B as well as the regulation of ER-phagy.
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Affiliation(s)
- Akane Kanamori
- Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Shohei Hinaga
- Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Yoko Hirata
- Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
| | - Fumimasa Amaya
- Department of Pain Management and Palliative Care Medicine, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamikyo-Ku, Kyoto, 602-0841, Japan
| | - Kentaro Oh-Hashi
- Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
- Center for One Medicine Innovative Translational Research (COMIT), Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
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Chen T, Dalton G, Oh SH, Maeso-Diaz R, Du K, Meyers RA, Guy C, Abdelmalek MF, Henao R, Guarnieri P, Pullen SS, Gregory S, Locker J, Brown JM, Diehl AM. Hepatocyte Smoothened Activity Controls Susceptibility to Insulin Resistance and Nonalcoholic Fatty Liver Disease. Cell Mol Gastroenterol Hepatol 2022; 15:949-970. [PMID: 36535507 PMCID: PMC9957752 DOI: 10.1016/j.jcmgh.2022.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 12/09/2022] [Accepted: 12/09/2022] [Indexed: 01/07/2023]
Abstract
BACKGROUND & AIMS Nonalcoholic steatohepatitis (NASH), a leading cause of cirrhosis, strongly associates with the metabolic syndrome, an insulin-resistant proinflammatory state that disrupts energy balance and promotes progressive liver degeneration. We aimed to define the role of Smoothened (Smo), an obligatory component of the Hedgehog signaling pathway, in controlling hepatocyte metabolic homeostasis and, thereby, susceptibility to NASH. METHODS We conditionally deleted Smo in hepatocytes of healthy chow-fed mice and performed metabolic phenotyping, coupled with single-cell RNA sequencing (RNA-seq), to characterize the role of hepatocyte Smo in regulating basal hepatic and systemic metabolic homeostasis. Liver RNA-seq datasets from 2 large human cohorts were also analyzed to define the relationship between Smo and NASH susceptibility in people. RESULTS Hepatocyte Smo deletion inhibited the Hedgehog pathway and promoted fatty liver, hyperinsulinemia, and insulin resistance. We identified a plausible mechanism whereby inactivation of Smo stimulated the mTORC1-SREBP1c signaling axis, which promoted lipogenesis while inhibiting the hepatic insulin cascade. Transcriptomics of bulk and single Smo-deficient hepatocytes supported suppression of insulin signaling and also revealed molecular abnormalities associated with oxidative stress and mitochondrial dysfunction. Analysis of human bulk RNA-seq data revealed that Smo expression was (1) highest in healthy livers, (2) lower in livers with NASH than in those with simple steatosis, (3) negatively correlated with markers of insulin resistance and liver injury, and (4) declined progressively as fibrosis severity worsened. CONCLUSIONS The Hedgehog pathway controls insulin sensitivity and energy homeostasis in adult livers. Loss of hepatocyte Hedgehog activity induces hepatic and systemic metabolic stress and enhances susceptibility to NASH by promoting hepatic lipoxicity and insulin resistance.
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Affiliation(s)
- Tianyi Chen
- Department of Medicine, Duke University, Durham, North Carolina
| | - George Dalton
- Department of Medicine, Duke University, Durham, North Carolina
| | - Seh-Hoon Oh
- Department of Medicine, Duke University, Durham, North Carolina
| | | | - Kuo Du
- Department of Medicine, Duke University, Durham, North Carolina
| | - Rachel A Meyers
- Department of Medicine, Duke University, Durham, North Carolina
| | - Cynthia Guy
- Department of Medicine, Duke University, Durham, North Carolina
| | | | - Ricardo Henao
- Department of Medicine, Duke University, Durham, North Carolina
| | - Paolo Guarnieri
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - Steven S Pullen
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - Simon Gregory
- Department of Medicine, Duke University, Durham, North Carolina
| | - Joseph Locker
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - J Mark Brown
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio
| | - Anna Mae Diehl
- Department of Medicine, Duke University, Durham, North Carolina.
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Identification of Tumor Antigens and Immune Subtypes of Malignant Mesothelioma for mRNA Vaccine Development. Vaccines (Basel) 2022; 10:vaccines10081168. [PMID: 35893817 PMCID: PMC9331978 DOI: 10.3390/vaccines10081168] [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: 06/09/2022] [Revised: 07/07/2022] [Accepted: 07/13/2022] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND mRNA-based cancer vaccines have been considered a promising anticancer therapeutic approach against various cancers, yet their efficacy for malignant mesothelioma (MESO) is still not clear. The present study is designed to identify MESO antigens that have the potential for mRNA vaccine development, and to determine the immune subtypes for the selection of suitable patients. METHODS A total of 87 MESO datasets were used for the retrieval of RNA sequencing and clinical data from The Cancer Genome Atlas (TCGA) databases. The possible antigens were identified by a survival and a genome analysis. The samples were divided into two immune subtypes by the application of a consensus clustering algorithm. The functional annotation was also carried out by using the DAVID program. Furthermore, the characterization of each immune subtype related to the immune microenvironment was integrated by an immunogenomic analysis. A protein-protein interaction network was established to categorize the hub genes. RESULTS The five tumor antigens were identified in MESO. FAM134B, ALDH3A2, SAV1, and RORC were correlated with superior prognoses and the infiltration of antigen-presenting cells (APCs), while FN1 was associated with poor survival and the infiltration of APCs. Two immune subtypes were identified; TM2 exhibited significantly improved survival and was more likely to benefit from vaccination compared with TM1. TM1 was associated with a relatively quiet microenvironment, high tumor mutation burden, and enriched DNA damage repair pathways. The immune checkpoints and immunogenic cell death modulators were also differentially expressed between two subtypes. Finally, FN1 was identified to be the hub gene. CONCLUSIONS FAM134B, ALDH3A2, SAV1, RORC, and FN1 are considered as possible and effective mRNA anti-MESO antigens for the development of an mRNA vaccine, and TM2 patients are the most suitable for vaccination.
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Zhao J, Li Z, Li J. The crystal structure of the FAM134B-GABARAP complex provides mechanistic insights into the selective binding of FAM134 to the GABARAP subfamily. FEBS Open Bio 2021; 12:320-331. [PMID: 34854256 PMCID: PMC8727931 DOI: 10.1002/2211-5463.13340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 11/07/2021] [Accepted: 11/30/2021] [Indexed: 01/18/2023] Open
Abstract
The mammalian Atg8 family (Atg8s proteins) consists of two subfamilies: GABARAP and LC3. All members can bind to the LC3‐interacting region (LIR) or Atg8‐interacting motif and participate in multiple steps of autophagy. The endoplasmic reticulum (ER) autophagy receptor FAM134B contains an LIR motif that can bind to Atg8s, but whether it can differentially bind to the two subfamilies and, if so, the structural basis for this preference remains unknown. Here, we found that FAM134B bound to the GABARAP subfamily more strongly than to the LC3 subfamily. We then solved the crystal structure of the FAM134B–GABARAP complex and demonstrated that FAM134B used both its LIR core and the C‐terminal helix to bind to GABARAP. We further showed that these properties might be conserved in FAM134A or FAM134C. The structure also allowed us to identify the structural determinants for the binding selectivity. Our work may be valuable for studying the differential functions of GABARAP and LC3 subfamilies in ER phagy in future.
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Affiliation(s)
- Junfeng Zhao
- Division of Cell, Developmental and Integrative Biology, School of Medicine, South China University of Technology, Guangzhou, China
| | - Zhiwei Li
- Division of Cell, Developmental and Integrative Biology, School of Medicine, South China University of Technology, Guangzhou, China
| | - Jianchao Li
- Division of Cell, Developmental and Integrative Biology, School of Medicine, South China University of Technology, Guangzhou, China.,Department of Otorhinolaryngology, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, China
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Wang C, Li Y, Li Y, Du L, Zhang J, Li N, Hu X, Zhang W, Xie N, Ming L. FAM134B-Mediated ER-Phagy in Mg 2+-Free Solution-Induced Mitochondrial Calcium Homeostasis and Cell Death in Epileptic Hippocampal Neurons. Neurochem Res 2021; 46:2485-2494. [PMID: 34212292 DOI: 10.1007/s11064-021-03389-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 06/22/2021] [Accepted: 06/24/2021] [Indexed: 12/12/2022]
Abstract
Mitochondrial-associated endoplasmic reticulum (ER) membranes (MAMs) regulate calcium (Ca2+) homeostasis via Ca2+ transport-related proteins such as inositol-1,4,5-triphosphate receptor (IP3R). FAM134B-mediated ER-phagy plays an important role in ER homeostasis. However, it remains unknown whether FAM134B-mediated ER-phagy affects mitochondrial Ca2+ homeostasis and cell death through MAMs. In this study, we demonstrated that colocalization degree of FAM134B with LC3 and the LC3-II/LC3-I ratio were elevated in the hippocampal neuronal culture (HNC) model of acquired epilepsy (AE), which indicate an increased level of autophagy. In this model, FAM134B overexpression enhanced ER-phagy, while FAM134B downregulation had the opposite effect. Additionally, FAM134B overexpression significantly reversed the increases in IP3R expression and mitochondrial Ca2+ concentration and the decrease in the ER Ca2+ concentration in this model. FAM134B overexpression also ameliorated the AE-induced ultrastructural damage in neuronal mitochondria, decrease in mitochondrial membrane potential (mMP), cytochrome c (CytC) release and caspase-3 activation, while FAM134B downregulation induced the opposite effects. Altogether, our data indicate that FAM134B-mediated ER-phagy can attenuate AE-induced neuronal apoptosis, possibly by modulating the IP3R in MAMs to alter Ca2+ exchange between ER and mitochondria and thus inhibit mitochondrial structural damage, a decrease in mMP, release of CytC and mitochondrial apoptosis.
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Affiliation(s)
- Cui Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Yujuan Li
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Yingjiao Li
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Liyuan Du
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Jingyu Zhang
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Nan Li
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Xiaomei Hu
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Wenjing Zhang
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Nanchang Xie
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China.
| | - Liang Ming
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China.
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