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Guo X, Mutch M, Torres AY, Nano M, Rauth N, Harwood J, McDonald D, Chen Z, Montell C, Dai W, Montell DJ. The Zn 2+ transporter ZIP7 enhances endoplasmic-reticulum-associated protein degradation and prevents neurodegeneration in Drosophila. Dev Cell 2024:S1534-5807(24)00228-4. [PMID: 38670102 DOI: 10.1016/j.devcel.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 12/15/2023] [Accepted: 04/03/2024] [Indexed: 04/28/2024]
Abstract
Proteotoxic stress drives numerous degenerative diseases. Cells initially adapt to misfolded proteins by activating the unfolded protein response (UPR), including endoplasmic-reticulum-associated protein degradation (ERAD). However, persistent stress triggers apoptosis. Enhancing ERAD is a promising therapeutic approach for protein misfolding diseases. The ER-localized Zn2+ transporter ZIP7 is conserved from plants to humans and required for intestinal self-renewal, Notch signaling, cell motility, and survival. However, a unifying mechanism underlying these diverse phenotypes was unknown. In studying Drosophila border cell migration, we discovered that ZIP7-mediated Zn2+ transport enhances the obligatory deubiquitination of proteins by the Rpn11 Zn2+ metalloproteinase in the proteasome lid. In human cells, ZIP7 and Zn2+ are limiting for deubiquitination. In a Drosophila model of neurodegeneration caused by misfolded rhodopsin (Rh1), ZIP7 overexpression degrades misfolded Rh1 and rescues photoreceptor viability and fly vision. Thus, ZIP7-mediated Zn2+ transport is a previously unknown, rate-limiting step for ERAD in vivo with therapeutic potential in protein misfolding diseases.
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Affiliation(s)
- Xiaoran Guo
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Morgan Mutch
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Alba Yurani Torres
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Maddalena Nano
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Nishi Rauth
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Jacob Harwood
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Drew McDonald
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Zijing Chen
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Craig Montell
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA
| | - Wei Dai
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA; Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Fudan University, Shanghai, China.
| | - Denise J Montell
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110, USA.
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Hu P, Li K, Peng X, Kan Y, Li H, Zhu Y, Wang Z, Li Z, Liu HY, Cai D. Nuclear Receptor PPARα as a Therapeutic Target in Diseases Associated with Lipid Metabolism Disorders. Nutrients 2023; 15:4772. [PMID: 38004166 PMCID: PMC10674366 DOI: 10.3390/nu15224772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/04/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
Lipid metabolic diseases have substantial morbidity and mortality rates, posing a significant threat to human health. PPARα, a member of the peroxisome proliferator-activated receptors (PPARs), plays a crucial role in lipid metabolism and immune regulation. Recent studies have increasingly recognized the pivotal involvement of PPARα in diverse pathological conditions. This comprehensive review aims to elucidate the multifaceted role of PPARα in metabolic diseases including liver diseases, diabetes-related diseases, age-related diseases, and cancers, shedding light on the underlying molecular mechanisms and some regulatory effects of natural/synthetic ligands of PPARα. By summarizing the latest research findings on PPARα, we aim to provide a foundation for the possible therapeutic exploitation of PPARα in lipid metabolic diseases.
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Affiliation(s)
- Ping Hu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Kaiqi Li
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Xiaoxu Peng
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Yufei Kan
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Hao Li
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Yanli Zhu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Ziyu Wang
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Zhaojian Li
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
| | - Hao-Yu Liu
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
- International Joint Research Laboratory in Universities of Jiangsu Province of China for Domestic Animal Germplasm Resources and Genetic Improvement, Yangzhou 225009, China
| | - Demin Cai
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China; (P.H.); (K.L.); (X.P.); (Y.K.); (H.L.); (Y.Z.); (Z.W.); (Z.L.)
- International Joint Research Laboratory in Universities of Jiangsu Province of China for Domestic Animal Germplasm Resources and Genetic Improvement, Yangzhou 225009, China
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Zhaohui C, Cifei T, Di H, Weijia Z, Cairui H, Zecong L, Xiaobo H. ROS-mediated PERK-CHOP pathway plays an important role in cadmium-induced HepG2 cells apoptosis. Environ Toxicol 2023; 38:2271-2280. [PMID: 37300854 DOI: 10.1002/tox.23866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/10/2023] [Accepted: 05/28/2023] [Indexed: 06/12/2023]
Abstract
Cadmium (Cd) is a common heavy metal that is highly toxic to the liver, however, the exact mechanism underlying this damage accompanied by apoptosis has not been thoroughly demonstrated. In this study, we found that Cd exposure significantly reduced cell viability, including the increased populations of apoptotic cells and caspase-3/-7/-12 activation in HepG2 cells. Mechanistically, Cd initiated oxidative stress via elevating reactive oxygen species (ROS) levels, leading to oxidative damage in HepG2 cells. Simultaneously, Cd exposure induced endoplasmic reticulum (ER) stress via activating the protein kinase RNA-like ER kinase (PERK)-C/EBP homologous protein (CHOP) axis in HepG2 cells, and subsequently disturbed ER function as increased Ca2+ releasing from ER lumen. Intriguingly, further study revealed that oxidative stress is closely related with ER stress, as pretreatment with ROS scavenger, N-acetyl-l-cysteine (NAC) markedly reduced ER stress as well as protected ER function in Cd treated HepG2 cell. Collectively, these findings first revealed Cd exposure induced HepG2 cells death via a ROS-mediated PERK-CHOP-related apoptotic signaling pathway, which provides a novel insight into the mechanisms of Cd-induced hepatotoxicity. Furthermore, inhibitors for oxidative stress and ER stress might be considered as a new strategy to prevent or treat this disorder.
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Affiliation(s)
- Cao Zhaohui
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
- The Key Laboratory of Ecological Environment and Critical Human Diseases Prevention of Hunan Province Department of Education, University of South China, Hengyang, China
| | - Tang Cifei
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
- The Key Laboratory of Ecological Environment and Critical Human Diseases Prevention of Hunan Province Department of Education, University of South China, Hengyang, China
| | - Huang Di
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
- The Key Laboratory of Ecological Environment and Critical Human Diseases Prevention of Hunan Province Department of Education, University of South China, Hengyang, China
| | - Zeng Weijia
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
| | - Han Cairui
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
| | - Li Zecong
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
| | - Hu Xiaobo
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, China
- The Key Laboratory of Ecological Environment and Critical Human Diseases Prevention of Hunan Province Department of Education, University of South China, Hengyang, China
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Iyer S, Adams DJ. Bone and the Unfolded Protein Response: In Sickness and in Health. Calcif Tissue Int 2023; 113:96-109. [PMID: 37243756 PMCID: PMC10326125 DOI: 10.1007/s00223-023-01096-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 05/08/2023] [Indexed: 05/29/2023]
Abstract
Differentiation and optimal function of osteoblasts and osteoclasts are contingent on synthesis and maintenance of a healthy proteome. Impaired and/or altered secretory capacity of these skeletal cells is a primary driver of most skeletal diseases. The endoplasmic reticulum (ER) orchestrates the folding and maturation of membrane as well as secreted proteins at high rates within a calcium rich and oxidative organellar niche. Three ER membrane proteins monitor fidelity of protein processing in the ER and initiate an intricate signaling cascade known as the Unfolded Protein Response (UPR) to remediate accumulation of misfolded proteins in its lumen, a condition referred to as ER stress. The UPR aids in fine-tuning, expanding and/or modifying the cellular proteome, especially in specialized secretory cells, to match everchanging physiologic cues and metabolic demands. Sustained activation of the UPR due to chronic ER stress, however, is known to hasten cell death and drive pathophysiology of several diseases. A growing body of evidence suggests that ER stress and an aberrant UPR may contribute to poor skeletal health and the development of osteoporosis. Small molecule therapeutics that target distinct components of the UPR may therefore have implications for developing novel treatment modalities relevant to the skeleton. This review summarizes the complexity of UPR actions in bone cells in the context of skeletal physiology and osteoporotic bone loss, and highlights the need for future mechanistic studies to develop novel UPR therapeutics that mitigate adverse skeletal outcomes.
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Affiliation(s)
- Srividhya Iyer
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, 12800 E 19th Ave, Mailstop:8343, Aurora, CO, 80045, USA.
| | - Douglas J Adams
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, 12800 E 19th Ave, Mailstop:8343, Aurora, CO, 80045, USA
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Guo X, Mutch M, Torres AY, Nano M, McDonald D, Chen Z, Montell C, Dai W, Montell DJ. Rescue of proteotoxic stress and neurodegeneration by the Zn 2+ transporter ZIP7. bioRxiv 2023:2023.05.22.541645. [PMID: 37292980 PMCID: PMC10245811 DOI: 10.1101/2023.05.22.541645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Proteotoxic stress drives numerous degenerative diseases. In response to misfolded proteins, cells adapt by activating the unfolded protein response (UPR), including endoplasmic reticulum-associated protein degradation (ERAD). However persistent stress triggers apoptosis. Enhancing ERAD is a promising therapeutic approach for protein misfolding diseases. From plants to humans, loss of the Zn2+ transporter ZIP7 causes ER stress, however the mechanism is unknown. Here we show that ZIP7 enhances ERAD and that cytosolic Zn2+ is limiting for deubiquitination of client proteins by the Rpn11 Zn2+ metalloproteinase as they enter the proteasome in Drosophila and human cells. ZIP7 overexpression rescues defective vision caused by misfolded rhodopsin in Drosophila. Thus ZIP7 overexpression may prevent diseases caused by proteotoxic stress, and existing ZIP inhibitors may be effective against proteasome-dependent cancers.
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Affiliation(s)
- Xiaoran Guo
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
- present address: Biochemistry Department, Stanford University, Stanford, CA 94305
| | - Morgan Mutch
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Alba Yurani Torres
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Maddalena Nano
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Drew McDonald
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Zijing Chen
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Craig Montell
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
| | - Wei Dai
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
- Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Fudan University, Shanghai, China
| | - Denise J. Montell
- Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, CA 93110
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Guo CL, Liu HM, Li B, Lu ZY. Angiotensin-(1–9) prevents angiotensin II-induced endothelial apoptosis through CNPY2/PERK pathway. Apoptosis 2022; 28:379-396. [PMID: 36422742 DOI: 10.1007/s10495-022-01793-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2022] [Indexed: 11/25/2022]
Abstract
Endothelial apoptosis caused by activation of renin-angiotensin system (RAS) plays a vital part in the occurrence and progress of hypertension. Angiotensin-(1-9) (Ang-(1-9)) is a peptide of the counter-regulatory non-classical RAS with anti-hypertensive effects in vascular endothelial cells (ECs). However, the mechanism of action remains unclear. Considering that the endothelial apoptosis was closely related to endoplasmic reticulum stress (ERS) and mitochondrial function. Herein, we aimed to elucidate the effects of Ang-(1-9) on endothelial apoptosis and the underlying molecular mechanism in angiotensin II (Ang II) induced hypertension. In human umbilical vascular endothelial cells (HUVECs), we observed Ang-(1-9) inhibited Ang II-induced ERS associated endothelial apoptosis. Mechanically, Ang-(1-9) inhibited endothelial apoptosis by blocking CNPY2/PERK mediated CaMKII/Drp1-dependent mitochondrial fission and eIF2α/CHOP signal. Consistent with above effects in HUVECs, in Ang II-induced hypertensive mice, we found administration of exogenous Ang-(1-9) attenuated endothelial apoptosis and arterial blood pressure, which were mediated by CNPY2/PERK signaling pathway. Our study indicated Ang-(1-9) inhibited Ang II-induced hypertension through CNPY2/PERK pathway. These findings may provide new insights for prevention and treatment of hypertension in future.
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Lazaro-Pena MI, Ward ZC, Yang S, Strohm A, Merrill AK, Soto CA, Samuelson AV. HSF-1: Guardian of the Proteome Through Integration of Longevity Signals to the Proteostatic Network. Front Aging 2022; 3:861686. [PMID: 35874276 PMCID: PMC9304931 DOI: 10.3389/fragi.2022.861686] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/13/2022] [Indexed: 12/15/2022]
Abstract
Discoveries made in the nematode Caenorhabditis elegans revealed that aging is under genetic control. Since these transformative initial studies, C. elegans has become a premier model system for aging research. Critically, the genes, pathways, and processes that have fundamental roles in organismal aging are deeply conserved throughout evolution. This conservation has led to a wealth of knowledge regarding both the processes that influence aging and the identification of molecular and cellular hallmarks that play a causative role in the physiological decline of organisms. One key feature of age-associated decline is the failure of mechanisms that maintain proper function of the proteome (proteostasis). Here we highlight components of the proteostatic network that act to maintain the proteome and how this network integrates into major longevity signaling pathways. We focus in depth on the heat shock transcription factor 1 (HSF1), the central regulator of gene expression for proteins that maintain the cytosolic and nuclear proteomes, and a key effector of longevity signals.
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Affiliation(s)
- Maria I. Lazaro-Pena
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
| | - Zachary C. Ward
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
| | - Sifan Yang
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- Department of Biology, University of Rochester, Rochester, NY, United States
| | - Alexandra Strohm
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, United States
- Toxicology Training Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Alyssa K. Merrill
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, United States
- Toxicology Training Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Celia A. Soto
- Department of Pathology, University of Rochester Medical Center, Rochester, NY, United States
- Cell Biology of Disease Graduate Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Andrew V. Samuelson
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- *Correspondence: Andrew V. Samuelson,
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Fu F, Doroudgar S. IRE1/XBP1 and Endoplasmic Reticulum Signaling – From Basic to Translational Research for Cardiovascular Disease. Current Opinion in Physiology 2022; 28. [DOI: 10.1016/j.cophys.2022.100552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hu Q, Zheng J, Xu XN, Gu C, Li W. Uranium induces kidney cells apoptosis via reactive oxygen species generation, endoplasmic reticulum stress and inhibition of PI3K/AKT/mTOR signaling in culture. Environ Toxicol 2022; 37:899-909. [PMID: 35044038 DOI: 10.1002/tox.23453] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/21/2021] [Accepted: 12/27/2021] [Indexed: 05/20/2023]
Abstract
Uranium (U) induces generation of excessive intracellular reactive oxygen species (ROS), which is generally considered as a possible mediator of U-triggered kidney tubular cells injury and nephrotoxicity. Our goal is designed to elucidate that the precise molecular mechanism in ROS downstream is association with U-induced NRK-52E cells apoptosis. The results show that U intoxication in NRK-52E cells reduced cell activity and triggered apoptosis, as demonstrated by flow cytometry and apoptotic marker cleaved Caspase-3 expression. U exposure triggered endoplasmic reticulum (ER) stress, which is involvement of apoptosis determined by marker molecules including GRP78, PERK, IRE1, ATF6, CHOP, cleaved Caspase-12, and Caspase-3. Administration of antioxidant N-acetylcysteine (NAC) effectively blocked U-triggered ROS generation, ER stress, and apoptosis. U contamination evidently decreased the expression of phosphorylation PI3K, AKT, and mTOR and ratios of their respective phosphorylation to the corresponding total proteins. Application of a PI3K activator IGF-1 significantly abolished these adverse effects of U intoxication on PI3K/AKT/mTOR signaling and subsequently abrogated U-triggered apoptosis. NAC also effectively reversed down-regulation of phosphorylated PI3K induced by U exposure. Taken together, these data strongly suggest that U treatment induces NRK-52E cells apoptosis through ROS production, ER stress, and down-regulation of PI3K/AKT/mTOR signaling. Targeting ROS formation-, ER stress-, and PI3K/AKT/mTOR pathway-mediated apoptosis could be a novel approach for attenuating U-triggered nephrotoxicity.
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Affiliation(s)
- Qiaoni Hu
- Department of Health Inspection and Quarantine, School of Public Health, Guilin Medical University, Guilin, China
| | - Jifang Zheng
- Department of Health Inspection and Quarantine, School of Public Health, Guilin Medical University, Guilin, China
- Guangxi Key Laboratory of Tumor Immunology and Microenvironment Regulation, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin, China
| | - Xiao Na Xu
- Department of Health Inspection and Quarantine, School of Public Health, Guilin Medical University, Guilin, China
| | - Chaohao Gu
- Guangxi Key Laboratory of Tumor Immunology and Microenvironment Regulation, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin, China
| | - Wanting Li
- Guangxi Key Laboratory of Tumor Immunology and Microenvironment Regulation, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin, China
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Ren L, Jiang J, Huang J, Zang Y, Huang Q, Zhang L, Wei J, Lu H, Wu S, Zhou X. Maternal exposure to PM2.5 induces the testicular cell apoptosis in offspring triggered by the UPR-mediated JNK pathway. Toxicol Res (Camb) 2022; 11:226-234. [PMID: 35237427 PMCID: PMC8882805 DOI: 10.1093/toxres/tfab116] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 11/03/2021] [Indexed: 01/28/2023] Open
Abstract
Contemporary exposure to PM2.5 has been reported to disrupt spermatogenesis. However, the subsequent toxicological responses and the mechanisms of male reproductive damage in offspring induced by maternal exposure to PM2.5 remain largely unknown. For the first time, this study aimed to explore the apoptotic response in spermatogenesis of male offspring following maternal exposure to PM2.5 and its mechanisms. The C57BL/6 mice with vaginal plugs were randomly divided into four groups. Mice in the PM2.5 groups were intratracheally exposed to PM2.5 (4.8 mg/kg body weight, 43.2 mg/kg body weight) during pregnancy (every 3 days, six times in total). The mice in the membrane control group were treated similarly to the PM2.5 groups, applying only PM2.5 sampling membrane, while mice in the control group were kept untreated. The results showed that maternal exposure to PM2.5 during pregnancy resulted in structural lesions of the testis, reduced numbers of primary spermatocytes and spermatids, decreased sperm count and quality, shortened diameter of seminiferous tubules, and reduced testosterone and ABP in the offspring testes. Furthermore, cell apoptosis was increased and protein expression of IRE-1/P-JNK/cleaved caspase-12/cleaved caspase-3 was activated. These findings suggested that maternal exposure to PM2.5 may affect spermatogenesis by increasing apoptosis through activation of UPR-mediated JNK apoptotic pathway in offspring testicles and by reducing testosterone secretion.
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Affiliation(s)
- Lihua Ren
- School of Nursing, Peking University, Beijing 100191, China
| | - Jianjun Jiang
- Department of Toxicology, School of Public Health, Peking University, Beijing 100191, China
| | - Jing Huang
- School of Nursing, Peking University, Beijing 100191, China
| | - Yu Zang
- School of Nursing, Peking University, Beijing 100191, China
| | - Qifang Huang
- School of Nursing, Peking University, Beijing 100191, China
| | - Lianshuang Zhang
- Department of Histology and Embryology, BinZhou Medical University, Yan Tai 264003, China
| | - Jialiu Wei
- Department of Epidemiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Hong Lu
- Correspondence address. Department of Maternal and Child Nursing, School of Nursing, Peking University, Beijing 100191, China. Tel: +86-10-82805277; E-mail:
| | - Shaowei Wu
- Department of Occupational and Environmental Health, School of Public Health, Xi'an Jiaotong University, Beijing 100191, China
| | - Xianqing Zhou
- Department of Toxicology and Hygienic Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China
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López-Fuentes AJ, Nachón-Garduño KN, Suaste-Olmos F, Mendieta-Romero A, Peraza-Reyes L. Spindle Dynamics during Meiotic Development of the Fungus Podospora anserina Requires the Endoplasmic Reticulum-Shaping Protein RTN1. mBio 2021; 12:e0161521. [PMID: 34607459 DOI: 10.1128/mBio.01615-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The endoplasmic reticulum (ER) is an elaborate organelle composed of distinct structural and functional domains. ER structure and dynamics involve membrane-shaping proteins of the reticulon and Yop1/DP1 families, which promote membrane curvature and regulate ER shaping and remodeling. Here, we analyzed the function of the reticulon (RTN1) and Yop1 proteins (YOP1 and YOP2) of the model fungus Podospora anserina and their contribution to sexual development. We found that RTN1 and YOP2 localize to the peripheral ER and are enriched in the dynamic apical ER domains of the polarized growing hyphal region. We discovered that the formation of these domains is diminished in the absence of RTN1 or YOP2 and abolished in the absence of YOP1 and that hyphal growth is moderately reduced when YOP1 is deleted in combination with RTN1 and/or YOP2. In addition, we found that RTN1 associates with the Spitzenkörper. Moreover, RTN1 localization is regulated during meiotic development, where it accumulates at the apex of growing asci (meiocytes) during their differentiation and at their middle region during the subsequent meiotic progression. Furthermore, we discovered that loss of RTN1 affects ascospore (meiotic spore) formation, in a process that does not involve YOP1 or YOP2. Finally, we show that the defects in ascospore formation of rtn1 mutants are associated with defective nuclear segregation and spindle dynamics throughout meiotic development. Our results show that sexual development in P. anserina involves a developmental remodeling of the ER that implicates the reticulon RTN1, which is required for meiotic nucleus segregation.
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Morishita Y, Kellogg AP, Larkin D, Chen W, Vadrevu S, Satin L, Liu M, Arvan P. Cell death-associated lipid droplet protein CIDE-A is a noncanonical marker of endoplasmic reticulum stress. JCI Insight 2021; 6:143980. [PMID: 33661766 PMCID: PMC8119190 DOI: 10.1172/jci.insight.143980] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 03/02/2021] [Indexed: 01/05/2023] Open
Abstract
Secretory protein misfolding has been linked to ER stress and cell death. We expressed a TGrdw transgene encoding TG-G(2298)R, a misfolded mutant thyroglobulin reported to be linked to thyroid cell death. When the TGrdw transgene was expressed at low level in thyrocytes of TGcog/cog mice that experienced severe ER stress, we observed increased thyrocyte cell death and increased expression of CIDE-A (cell death-inducing DFFA-like effector-A, a protein of lipid droplets) in whole thyroid gland. Here we demonstrate that acute ER stress in cultured PCCL3 thyrocytes increases Cidea mRNA levels, maintained at least in part by increased mRNA stability, while being negatively regulated by activating transcription factor 6 - with similar observations that ER stress increases Cidea mRNA levels in other cell types. CIDE-A protein is sensitive to proteasomal degradation yet is stabilized by ER stress, and elevated expression levels accompany increased cell death. Unlike acute ER stress, PCCL3 cells adapted and surviving chronic ER stress maintained a disproportionately lower relative mRNA level of Cidea compared with that of other, classical ER stress markers, as well as a blunted Cidea mRNA response to a new, unrelated acute ER stress challenge. We suggest that CIDE-A is a novel marker linked to a noncanonical ER stress response program, with implications for cell death and survival.
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Affiliation(s)
- Yoshiaki Morishita
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University, Aichi, Japan
| | - Aaron P. Kellogg
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Dennis Larkin
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Wei Chen
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Suryakiran Vadrevu
- Department of Pharmacology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Leslie Satin
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Department of Pharmacology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Ming Liu
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Department of Endocrinology & Diabetes, Tianjin Medical University, Tianjin, China
| | - Peter Arvan
- Division of Metabolism, Endocrinology & Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
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Abstract
Senescence is a cellular state which can be viewed as a stress response phenotype implicated in various physiological and pathological processes, including cancer. Therefore, it is of fundamental importance to understand why and how a cell acquires and maintains a senescent phenotype. Direct evidence has pointed to the homeostasis of the endoplasmic reticulum whose control appears strikingly affected during senescence. The endoplasmic reticulum is one of the sensing organelles that transduce signals between different pathways in order to adapt a functional proteome upon intrinsic or extrinsic challenges. One of these signaling pathways is the Unfolded Protein Response (UPR), which has been shown to be activated during senescence. Its exact contribution to senescence onset, maintenance, and escape, however, is still poorly understood. In this article, we review the mechanisms through which the UPR contributes to the appearance and maintenance of characteristic senescent features. We also discuss whether the perturbation of the endoplasmic reticulum proteostasis or accumulation of misfolded proteins could be possible causes of senescence, and-as a consequence-to what extent the UPR components could be considered as therapeutic targets allowing for the elimination of senescent cells or altering their secretome to prevent neoplastic transformation.
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Affiliation(s)
- Olivier Pluquet
- Univ Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France.
| | - Corinne Abbadie
- Univ Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France
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14
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Koo JH, Han CY. Signaling Nodes Associated with Endoplasmic Reticulum Stress during NAFLD Progression. Biomolecules 2021; 11:242. [PMID: 33567666 DOI: 10.3390/biom11020242] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/29/2021] [Accepted: 02/04/2021] [Indexed: 12/19/2022] Open
Abstract
Excess and sustained endoplasmic reticulum (ER) stress, paired with a failure of initial adaptive responses, acts as a critical trigger of nonalcoholic fatty liver disease (NAFLD) progression. Unfortunately, there is no drug currently approved for treatment, and the molecular basis of pathogenesis by ER stress remains poorly understood. Classical ER stress pathway molecules have distinct but inter-connected functions and complicated effects at each phase of the disease. Identification of the specific molecular signal mediators of the ER stress-mediated pathogenesis is, therefore, a crucial step in the development of new treatments. These signaling nodes may be specific to the cell type and/or the phase of disease progression. In this review, we highlight the recent advancements in knowledge concerning signaling nodes associated with ER stress and NAFLD progression in various types of liver cells.
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Dastghaib S, Kumar PS, Aftabi S, Damera G, Dalvand A, Sepanjnia A, Kiumarsi M, Aghanoori MR, Sohal SS, Ande SR, Alizadeh J, Mokarram P, Ghavami S, Sharma P, Zeki AA. Mechanisms Targeting the Unfolded Protein Response in Asthma. Am J Respir Cell Mol Biol 2021; 64:29-38. [PMID: 32915643 DOI: 10.1165/rcmb.2019-0235tr] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 09/11/2020] [Indexed: 12/16/2022] Open
Abstract
Lung cells are constantly exposed to various internal and external stressors that disrupt protein homeostasis. To cope with these stimuli, cells evoke a highly conserved adaptive mechanism called the unfolded protein response (UPR). UPR stressors can impose greater protein secretory demands on the endoplasmic reticulum (ER), resulting in the development, differentiation, and survival of these cell types to meet these increasing functional needs. Dysregulation of the UPR leads to the development of the disease. The UPR and ER stress are involved in several human conditions, such as chronic inflammation, neurodegeneration, metabolic syndrome, and cancer. Furthermore, potent and specific compounds that target the UPR pathway are under development as future therapies. The focus of this review is to thoroughly describe the effects of both internal and external stressors on the ER in asthma. Furthermore, we discuss how the UPR signaling pathway is activated in the lungs to overcome cellular damage. We also present an overview of the pathogenic mechanisms, with a brief focus on potential strategies for pharmacological interventions.
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Affiliation(s)
- Sanaz Dastghaib
- Department of Clinical Biochemistry and
- Autophagy Research Center, Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - P Sravan Kumar
- National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana, India
| | - Sajjad Aftabi
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine
- Medical Physics Department and
| | - Gautam Damera
- Personalized and Predictive Medicine (Respiratory), Global Research and Development, Teva Pharmaceuticals, Malvern, Pennsylvania
| | - Azadeh Dalvand
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine
| | - Adel Sepanjnia
- Department of Immunology, School of Medicine, Jiroft University of Medical Science, Jiroft, Iran
| | - Mohammad Kiumarsi
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine
| | - Mohamad-Reza Aghanoori
- Department of Human Genetics, School of Medicine, and
- Department of Pharmacology and Therapeutics
- Division of Neurodegenerative Disorders, Albrechtsen Research Centre, St. Boniface Hospital, Winnipeg, Manitoba, Canada
| | - Sukhwinder Singh Sohal
- Respiratory Translational Research Group, Department of Laboratory Medicine, College of Health and Medicine, University of Tasmania, Launceston, Tasmania, Australia
| | | | - Javad Alizadeh
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine
- Research Institute of Oncology and Hematology, Cancer Care Manitoba-University of Manitoba, Winnipeg, Manitoba, Canada
| | - Pooneh Mokarram
- Department of Clinical Biochemistry and
- Autophagy Research Center, Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saeid Ghavami
- Autophagy Research Center, Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine
- Department of Internal Medicine, and
- Biology of Breathing Theme, Children Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Pawan Sharma
- Center for Translational Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Amir A Zeki
- Lung Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Internal Medicine, School of Medicine, University of California, Davis, Davis, California; and
- Veterans Affairs Medical Center, Mather, California
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Abstract
Outbreaks of emerging infections, such as COVID-19 pandemic especially, confront health professionals with the unique challenge of treating patients. With no time to discover new drugs, repurposing of approved drugs or in clinical development is likely the only solution. Replication of coronaviruses (CoVs) occurs in a modified membranous compartment derived from the endoplasmic reticulum (ER), causes host cell ER stress and activates pathways to facilitate adaptation of the host cell machinery to viral needs. Accordingly, modulation of ER remodeling and ER stress response might be pivotal in elucidating CoV-host interactions and provide a rationale for new therapeutic, host-based antiviral approaches. The sigma-1 receptor (Sig-1R) is a ligand-operated, ER membrane-bound chaperone that acts as an upstream modulator of ER stress and thus a candidate host protein for host-based repurposing approaches to treat COVID-19 patients. Sig-1R ligands are frequently identified in in vitro drug repurposing screens aiming to identify antiviral compounds against CoVs, including severe acute respiratory syndrome CoV-2 (SARS-CoV-2). Sig-1R regulates key mechanisms of the adaptive host cell stress response and takes part in early steps of viral replication. It is enriched in lipid rafts and detergent-resistant ER membranes, where it colocalizes with viral replicase proteins. Indeed, the non-structural SARS-CoV-2 protein Nsp6 interacts with Sig-1R. The activity of Sig-1R ligands against COVID-19 remains to be specifically assessed in clinical trials. This review provides a rationale for targeting Sig-1R as a host-based drug repurposing approach to treat COVID-19 patients. Evidence gained using Sig-1R ligands in unbiased in vitro antiviral drug screens and the potential mechanisms underlying the modulatory effect of Sig-1R on the host cell response are discussed. Targeting Sig-1R is not expected to reduce dramatically established viral replication, but it might interfere with early steps of virus-induced host cell reprogramming, aid to slow down the course of infection, prevent the aggravation of the disease and/or allow a time window to mature a protective immune response. Sig-1R-based medicines could provide benefit not only as early intervention, preventive but also as adjuvant therapy.
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Affiliation(s)
- José Miguel Vela
- Drug Discovery and Preclinical Development, ESTEVE Pharmaceuticals, Barcelona, Spain
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Li R, Wang Y, Chen P, Meng J, Zhang H. G-protein-coupled estrogen receptor protects retinal ganglion cells via inhibiting endoplasmic reticulum stress under hyperoxia. J Cell Physiol 2020; 236:3780-3788. [PMID: 33151568 DOI: 10.1002/jcp.30149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 12/15/2022]
Abstract
Abnormal development of immature retinal vascular structure in preterm infants under the condition of hyperoxia is the primary cause of retinopathy of prematurity (ROP), which has become the leading cause of blindness in children. Retinal ganglion cells (RGCs) play a critical role in the normal growth of retinal vessels. Previous studies have indicated that estrogen can alleviate retinal lesions in the ROP animal model by inhibiting reactive oxygen species, which is associated with endoplasmic reticulum (ER) stress. This study aimed to investigate the protecting effect of G-protein coupled estrogen receptor (GPER), one of the estrogen receptors distributed in ER, on RGCs in the early stage of ROP and its relationship with ER stress. We found that GPER was widely expressed in primary cultured murine RGCs. GPER activation by its agonist G-1 increased cell vitality and decreased apoptosis and autophagy of RGCs under hyperoxia. GPER activation by G-1 decreased the expressions of the ER stress proteins, including inositol-requiring kinase/endonuclease 1α, pancreatic ER stress kinase, and cleaved activating transcription factor 6 in ER of RGCs under hyperoxia. GPER activation decreased IP3R activity and increased Ca2+ concentration in ER of RGCs under hyperoxia. In addition, GPER antagonist (G-15) reversed all these effects of the GPER agonist mentioned above. This study suggested that GPER activation can protect the survival of RGCs in the early stage of ROP via reducing ER stress in RGCs under the condition of hyperoxia.
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Affiliation(s)
- Rong Li
- Department of Ophthalmology, The First Affiliated Hospital of Xi'an Medical University, Xi'an, Shaanxi, China
| | - Yao Wang
- Department of Ophthalmology, Eye Institute of Shaanxi Province and Xi'an First Hospital, Xi'an, Shaanxi, China
| | - Pei Chen
- Department of Ophthalmology, Eye Institute of Shaanxi Province and Xi'an First Hospital, Xi'an, Shaanxi, China
| | - Jiamin Meng
- School of Life Sciences, Northwest University, Xi'an, Shaanxi, China
| | - Hongbing Zhang
- Department of Ophthalmology, Eye Institute of Shaanxi Province and Xi'an First Hospital, Xi'an, Shaanxi, China
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Li S, Hao M, Li B, Chen M, Chen J, Tang J, Hong S, Min J, Hu M, Hong L. CACNA1H downregulation induces skeletal muscle atrophy involving endoplasmic reticulum stress activation and autophagy flux blockade. Cell Death Dis 2020; 11:279. [PMID: 32332705 PMCID: PMC7181873 DOI: 10.1038/s41419-020-2484-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 04/10/2020] [Indexed: 02/06/2023]
Abstract
Multiple vaginal delivery (MVD) is an important factor for pelvic floor muscle (PFM) function decline and pelvic floor dysfunction (PFD). PFD is common in middle-aged and elderly women, but its pathogenesis is not clear. In this study, we found that the expression of CACNA1H was lower in the PFM of old mice after MVD compared with old or adult mice. In in-vitro studies, we found that treatment with the T-type Ca2+ channel (T-channel) inhibitor NNC-55 or downregulation of the CACNA1H gene by siRNA intervention promoted myotube atrophy and apoptosis. Mechanistically, we revealed that NNC-55 increased the expression of GRP78 and DDIT3 in myotubes, indicating endoplasmic reticulum stress (ERS) activation, and that the IRE1 and PERK pathways might be involved in this effect. NNC-55 induced the formation of autophagosomes but inhibited autophagy flux. Moreover, rapamycin, an autophagy activator, did not rescue myotube atrophy or apoptosis induced by NNC-55, and the autophagy inhibitors 3-MA and HCQ accelerated this damage. Further studies showed that the ERS inhibitors 4-PBA and TUDAC relieved NNC-55-induced damage and autophagy flux blockade. Finally, we found multisite muscle atrophy and decreased muscle function in Cacna1h−/− (TH-null) mice, as well as increased autophagy inhibition and apoptotic signals in the PFM of old WT mice after MVD and TH-null mice. Taken together, our results suggest that MVD-associated PFD is partially attributed to CACNA1H downregulation-induced PFM atrophy and that ERS is a potential therapeutic target for this disease.
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Affiliation(s)
- Suting Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Menglei Hao
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Bingshu Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Mao Chen
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Jue Chen
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Jianming Tang
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Shasha Hong
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Jie Min
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Ming Hu
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China
| | - Li Hong
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China.
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Rong K, Xia Q, Wu X, Zhou Z, Li X, Fei T, Chen J, Huang Z, Li J, Liu J, Yin X. Articular Cartilage Stem Cells Influence the Postoperative Repair of Hip Replacement by Regulating Endoplasmic Reticulum Stress in Chondrocytes via PERK Pathway. Orthop Surg 2020; 12:609-616. [PMID: 32147967 PMCID: PMC7189057 DOI: 10.1111/os.12644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/15/2020] [Accepted: 02/05/2020] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE Endoplasmic reticulum stress (ERS) is present in chondrocytes of osteoarthritis, and the intensity of ERS is related to the degree of cartilage degeneration. In vitro intervention strategies can change the status of ERS and induce the inhibition of ERS-related pathway. Therefore, this study is designed to explore the role and molecular mechanism of cartilage stem cells (ACSCs) of ERS in chondrocytes after hip replacement. METHODS Human cartilage cell lines C28/I2 were cultured as the control group. The ERS inducer was added into C28/I2 as ERS group. The third ERS + stem cells group was formed by adding cartilage stem cells into ERS group, and further transfection of si-PERK was defined as si-PERK + ERS + stem cells group. Cell cycle and apoptosis in the four groups were determined by flow cytometry. The protein expression of GRP78, PERK, ATF4, TMEM119, CDK4, Cyclin D, and BMP6 in chondrocytes in the four groups were investigated by western blot, and the distribution of PERK, TMEM119, and BMP6 in chondrocytes were observed by immunofluorescence assay. In addition, the transcriptional levels of Bcl2, Bax, and Caspase 3 were also determined by RT-PCR. RESULTS In cell cycle assay, ERS increased the accumulation of cells in G0 /G1 and G2 /M, while cartilage stem cells weakened the effects. The apoptosis rates in control group, ERS, ERS + stem cells, si-PERK + ERS + stem cells were 0%, 21.3%, 18.9%, and 15.9%, respectively, and the difference of apoptosis rate between the latter three groups and control group was statistically significant (P < 0.01). Stem cells could weaken the ERS-induced cell apoptosis, especially reducing the number of cells in the late stage of apoptosis from 5.4% to 1.1%. The protein level of GRP78, PERK, ATF4, TMEM119, and BMP6 in the group of ERS, ERS + stem cells, and si-PERK + ERS + stem cells were all significantly higher than those in control group, and the group of ERS + stem cells was the highest, all of the differences were significant (P < 0.01). However, the protein level of CDK4 and Cyclin D presented an absolutely opposite trend and the difference was still significant (P < 0.05). The group of si-PERK + ERS + stem cell was lower than those in the group of ERS + stem cell but higher than those in the group of ERS (P < 0.05). The level of Caspase 3 in the latter three groups was significantly higher than those in the control group, and the group of ERS was the highest (P < 0.01). Besides, the relative level of Bcl-2/Bax in control group was 1, but the group of ERS was about 0.5, and there was significant difference (P < 0.01). The ratio of Bcl-2/Bax in the group of ERS + stem cells was more than 2 and significantly higher than those of other groups. CONCLUSION ACSCs could reduce ERS-induced chondrocyte apoptosis by PERK and Bax/Bcl-2 signaling pathway.
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Affiliation(s)
- Ke Rong
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Qing‐quan Xia
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Xu‐hua Wu
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Zhen‐yu Zhou
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Xu‐jun Li
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Teng Fei
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Jiong Chen
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Zhongyue Huang
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Jiang Li
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Jiang‐yi Liu
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
| | - Xiao‐fan Yin
- Department of OrthopaedicsMinhang Hospital, Fudan UniversityShanghaiChina
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