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Hu XW, Li XM, Wang AM, Fu YM, Zhang FJ, Zeng F, Cao LP, Long H, Xiong YH, Xu J, Li J. Caffeine alleviates acute liver injury by inducing the expression of NEDD4L and deceasing GRP78 level via ubiquitination. Inflamm Res 2022; 71:1213-1227. [PMID: 35802146 DOI: 10.1007/s00011-022-01603-0] [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: 04/19/2022] [Accepted: 06/15/2022] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Acute liver injury is liver cell injury that occurs rapidly in a short period of time. Caffeine has been shown to maintain hepatoprotective effect with an unclear mechanism. Endoplasmic reticulum stress (ERS) has significant effects in acute liver injury. Induction of GRP78 is a hallmark of ERS. Whether or not caffeine's function is related to GRP78 remains to be explored. METHODS Acute liver injury model was established by LPS-treated L02 cells and in vivo administration of LPS/D-Gal in mice. Caffeine was pre-treated in L02 cells or mice. Gene levels was determined by real-time PCR and western blot. Cell viability was tested by CCK-8 assay and cell apoptosis was tested by flow cytometry. The interaction of GRP78 and NEDD4L was determined by Pull-down and co-immunoprecipitation (Co-IP) assay. The ubiquitination by NEDD4L on GRP78 was validated by in vitro ubiquitination assay. RESULTS Caffeine protected liver cells against acute injury induced cell apoptosis and ERS both in vitro and in vivo. Suppression of GRP78 could block the LPS-induced cell apoptosis and ERS. NEDD4L was found to interact with GRP78 and ubiquitinate its lysine of 324 site directly. Caffeine treatment induced the expression of NEDD4L, resulting in the ubiquitination and inhibition of GRP78. CONCLUSION Caffeine mitigated the acute liver injury by stimulating NEDD4L expression, which inhibited GRP78 expression via ubiquitination at its K324 site. Low dose of caffeine could be a promising therapeutic treatment for acute liver injury.
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Affiliation(s)
- Xing-Wang Hu
- Department of Emergency, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Xiang-Min Li
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Ai-Min Wang
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Yong-Ming Fu
- Scientific Research Center, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, 510080, Guangdong Province, People's Republic of China
| | - Fang-Jie Zhang
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Feng Zeng
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Li-Ping Cao
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Hui Long
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Ying-Hui Xiong
- Department of Emergency, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Ji Xu
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China
| | - Jia Li
- Department of Infectious Diseases/Hunan Provincial Key Laboratory of Viral Hepatitis, Xiangya Hospital Central South University, Changsha, 410008, Hunan Province, People's Republic of China.
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Tian RD, Chen YQ, He YH, Tang YJ, Chen GM, Yang FW, Li Y, Huang WG, Chen H, Liu X, Lin SD. Phosphorylation of eIF2α mitigates endoplasmic reticulum stress and hepatocyte necroptosis in acute liver injury. Ann Hepatol 2021; 19:79-87. [PMID: 31548168 DOI: 10.1016/j.aohep.2019.05.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 05/26/2019] [Accepted: 05/27/2019] [Indexed: 02/06/2023]
Abstract
INTRODUCTION AND OBJECTIVES Necroptosis and endoplasmic reticulum (ER) stress has been implicated in acute and chronic liver injury. Activated eukaryotic initiation factor 2 alpha (eIF2α) attenuates protein synthesis and relieves the load of protein folding in the ER. In this study, we aimed to analyze the impact of eIF2α phosphorylation on hepatocyte necroptosis in acute liver injury. MATERIALS AND METHODS Male BALB/c mice were injected with tunicamycin or d-galactosamine, and LO2 cells were incubated with tunicamycin to induce acute liver injury. 4-Phenylbutyric acid (PBA) and salubrinal were used to inhibit ER stress and eIF2α dephosphorylation, respectively. We analyzed the eIF2α phosphorylation, ER stress, and hepatocyte necroptosis in mice and cells model. RESULTS Tunicamycin or d-galactosamine significantly induced ER stress and necroptosis, as well as eIF2α phosphorylation, in mice and LO2 cells (p<0.05). ER stress aggravated tunicamycin-induced hepatocyte necroptosis in mice and LO2 cells (p<0.05). Elevated eIF2α phosphorylation significantly mitigated hepatocyte ER stress (p<0.05) and hepatocyte necroptosis in mice (34.37±3.39% vs 22.53±2.18%; p<0.05) and LO2 cells (1±0.11 vs 0.33±0.05; p<0.05). Interestingly, tumor necrosis factor receptor (TNFR) 1 protein levels were not completely synchronized with necroptosis. TNFR1 expression was reduced in d-galactosamine-treated mice (p<0.05) and cells incubated with tunicamycin for 12 and 24h (p<0.05). ER stress partially restored TNFR1 expression and increased necroptosis in tunicamycin-incubated cells (p<0.05). CONCLUSIONS These results imply that ER stress can mediate hepatocyte necroptosis independent of TNFR1 signaling and elevated eIF2α phosphorylation can mitigate ER stress during acute liver injury.
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Affiliation(s)
- Ren-Dong Tian
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Yi-Qun Chen
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Yi-Huai He
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China.
| | - Yong-Jing Tang
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Gui-Mei Chen
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Fang-Wan Yang
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Ying Li
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Wen-Ge Huang
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Huan Chen
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Xia Liu
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
| | - Shi-De Lin
- Department of Infectious Diseases, the Affiliated Hospital of Zunyi Medical College, ZunyiGuizhou, China
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Vikhorev PG, Vikhoreva NN, Yeung W, Li A, Lal S, dos Remedios CG, Blair CA, Guglin M, Campbell KS, Yacoub MH, de Tombe P, Marston SB. Titin-truncating mutations associated with dilated cardiomyopathy alter length-dependent activation and its modulation via phosphorylation. Cardiovasc Res 2020; 118:241-253. [PMID: 33135063 PMCID: PMC8752363 DOI: 10.1093/cvr/cvaa316] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 10/20/2020] [Indexed: 12/18/2022] Open
Abstract
Abstract
Aims
Dilated cardiomyopathy (DCM) is associated with mutations in many genes encoding sarcomere proteins. Truncating mutations in the titin gene TTN are the most frequent. Proteomic and functional characterizations are required to elucidate the origin of the disease and the pathogenic mechanisms of TTN-truncating variants.
Methods and results
We isolated myofibrils from DCM hearts carrying truncating TTN mutations and measured the Ca2+ sensitivity of force and its length dependence. Simultaneous measurement of force and adenosine triphosphate (ATP) consumption in skinned cardiomyocytes was also performed. Phosphorylation levels of troponin I (TnI) and myosin binding protein-C (MyBP-C) were manipulated using protein kinase A and λ phosphatase. mRNA sequencing was employed to overview gene expression profiles. We found that Ca2+ sensitivity of myofibrils carrying TTN mutations was significantly higher than in myofibrils from donor hearts. The length dependence of the Ca2+ sensitivity was absent in DCM myofibrils with TTN-truncating variants. No significant difference was found in the expression level of TTN mRNA between the DCM and donor groups. TTN exon usage and splicing were also similar. However, we identified down-regulation of genes encoding Z-disk proteins, while the atrial-specific regulatory myosin light chain gene, MYL7, was up-regulated in DCM patients with TTN-truncating variants.
Conclusion
Titin-truncating mutations lead to decreased length-dependent activation and increased elasticity of myofibrils. Phosphorylation levels of TnI and MyBP-C seen in the left ventricles are essential for the length-dependent changes in Ca2+ sensitivity in healthy donors, but they are reduced in DCM patients with TTN-truncating variants. A decrease in expression of Z-disk proteins may explain the observed decrease in myofibril passive stiffness and length-dependent activation.
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Affiliation(s)
- Petr G Vikhorev
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
| | - Natalia N Vikhoreva
- Heart Science Centre, Magdi Yacoub Institute, Harefield Hospital, London UB9 6JH, UK
| | - WaiChun Yeung
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
| | - Amy Li
- Department of Pharmacy and Biomedical Sciences, La Trobe University, Bendigo, VIC 3550, Australia
| | - Sean Lal
- School of Medical Sciences, Faculty of Medicine and Health, University of Sydney, NSW 2006, Australia
| | - Cristobal G dos Remedios
- Division of Molecular Cardiology and Biophysics, Victor Chang Cardiac Research Institute, Darlinghurst, NSW 2010, Australia
| | - Cheavar A Blair
- Division of Cardiovascular Medicine, Department of Physiology, University of Kentucky, Lexington, KY, USA
| | - Maya Guglin
- Division of Cardiovascular Medicine, Department of Physiology, University of Kentucky, Lexington, KY, USA
| | - Kenneth S Campbell
- Division of Cardiovascular Medicine, Department of Physiology, University of Kentucky, Lexington, KY, USA
| | - Magdi H Yacoub
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
| | - Pieter de Tombe
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
- Heart Science Centre, Magdi Yacoub Institute, Harefield Hospital, London UB9 6JH, UK
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, USA
| | - Steven B Marston
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
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Harada N, Gotoda Y, Hatakeyama A, Nakagawa T, Miyatake Y, Kuroda M, Masumoto S, Tsutsumi R, Nakaya Y, Sakaue H. Differential regulation of Actn2 and Actn3 expression during unfolded protein response in C2C12 myotubes. J Muscle Res Cell Motil 2020; 41:199-209. [PMID: 32451822 DOI: 10.1007/s10974-020-09582-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 05/20/2020] [Indexed: 11/29/2022]
Abstract
ACTN2 and ACTN3 encode sarcomeric α-actinin-2 and α-actinin-3 proteins, respectively, that constitute the Z-line in mammalian skeletal muscle fibers. In human ACTN3, a nonsense mutation at codon 577 that encodes arginine (R) produces the R577X polymorphism. Individuals having a homozygous 577XX genotype do not produce α-actinin-3 protein. The 577XX genotype reportedly occurs in sprint and power athletes in frequency lower than in the normal population, suggesting that α-actinin-3 deficiency diminishes fast-type muscle function. Among humans who carry 577R alleles, varying ACTN3 expression levels under certain conditions can have diverse effects on atheletic and muscle performance. However, the factors that regulate ACTN3 expression are unclear. Here we investigated whether the unfolded protein response (UPR) under endoplasmic reticulum (ER) stress regulates expression of Actn3 and its isoform Actn2 in mouse C2C12 myotubes. Among UPR-related transcription factors, XBP1 upregulated Actn2, whereas XBP1, ATF4 and ATF6 downregulated Actn3 promoter activity. Chemical induction of ER stress increased Actn2 mRNA levels, but decreased those for Actn3. ER stress also decreased α-actinin-3 protein levels, whereas levels of α-actinin-2 were unchanged. The intracellular composition of muscle contraction-related proteins was altered under ER stress, in that expression of parvalbumin (a fast-twitch muscle-specific protein) and troponin I type 1 (skeletal, slow) was suppressed. siRNA-induced suppression of Actn3 mimicked the inhibitory effect of ER stress on parvalbumin levels. Thus, endogenous expression levels of α-actinin-3 can be altered by ER stress, which may modulate muscle performance and athletic aptitudes, particularly in humans who carry ACTN3 577R alleles.
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Affiliation(s)
- Nagakatsu Harada
- Department of Health and Nutrition, Faculty of Nursing and Nutrition, The University of Shimane, 151 Nishihayashigi, Izumo City, Shimane, 693-8550, Japan. .,Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan.
| | - Yuka Gotoda
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Adzumi Hatakeyama
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Tadahiko Nakagawa
- Department of Health and Nutrition, Faculty of Nursing and Nutrition, The University of Shimane, 151 Nishihayashigi, Izumo City, Shimane, 693-8550, Japan
| | - Yumiko Miyatake
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Masashi Kuroda
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Saeko Masumoto
- Faculty of Food and Agricultural Sciences, Fukushima University, 1, Kanayagawa, Fukushima City, Fukushima, 960-1296, Japan
| | - Rie Tsutsumi
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Yutaka Nakaya
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
| | - Hiroshi Sakaue
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima City, Tokushima, 770-8503, Japan
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