1
|
Arshad U, Santos JEP. Graduate Student Literature Review: Exploring choline's important roles as a nutrient for transition dairy cows. J Dairy Sci 2024; 107:4357-4369. [PMID: 38522836 DOI: 10.3168/jds.2023-24050] [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: 08/04/2023] [Accepted: 01/22/2024] [Indexed: 03/26/2024]
Abstract
In late gestation and in the first weeks postpartum, lipid droplets accumulate in the hepatic tissue resulting in approximately 40% to 50% of the dairy cows developing hepatic lipidosis in the first weeks of lactation. Elevated concentrations of triacylglycerol in the hepatic tissue are associated with increased risk of peripartum diseases and impaired productive performance. Cows with hepatic lipidosis need to dispose the excess of hepatic triacylglycerol, but this is a slow process in the bovine liver and relies on primary mechanisms such as complete oxidation and ketogenesis because of the limited export of triacylglycerols as lipoproteins. Choline is a lipotropic compound because, among other functions, it facilitates the export of lipids from the liver. Supplementing choline as rumen-protected choline (RPC) to diets of feed-restricted dairy cows reduces the degree of triacylglycerol infiltration into the hepatic parenchyma in part by enhancing export of triacylglycerol as nascent lipoprotein. The reduced accumulation of triacylglycerol in hepatic tissue in feed-restricted cows fed RPC might affect secondary pathways involved in hepatic disposal of fatty acids such as increased cellular autophagy and lipophagy and minimize endoplasmic reticulum stress response and hepatocyte inflammation. Collectively, these effects on secondary pathways might further reduce the severity of hepatic lipidosis in cows. One of the benefits of supplementing RPC is improved fat digestibility, perhaps because choline, through phosphatidylcholines, facilitates lipid transport within the enterocyte by increasing the synthesis of chylomicrons. Finally, when supplemented during the transition period, RPC improves productive performance of cows, irrespective of their body condition, that extends well beyond the period of supplementation. This review summarizes the current understanding of hepatic lipidosis in early lactation, recapitulates the absorption, transport and metabolism of choline, and discusses its role on hepatic metabolism and gastrointestinal functions, which collectively results in improved performance in dairy cows.
Collapse
Affiliation(s)
- U Arshad
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611; Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.
| | | |
Collapse
|
2
|
Yousof TR, Bouchard CC, Alb M, Lynn EG, Lhoták S, Jiang H, MacDonald M, Li H, Byun JH, Makda Y, Athanasopoulos M, Maclean KN, Cherrington NJ, Naqvi A, Igdoura SA, Krepinsky JC, Steinberg GR, Austin RC. Restoration of the ER stress response protein TDAG51 in hepatocytes mitigates NAFLD in mice. J Biol Chem 2024; 300:105655. [PMID: 38237682 PMCID: PMC10875272 DOI: 10.1016/j.jbc.2024.105655] [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: 10/24/2023] [Revised: 12/24/2023] [Accepted: 12/27/2023] [Indexed: 02/16/2024] Open
Abstract
Endoplasmic reticulum stress is associated with insulin resistance and the development of nonalcoholic fatty liver disease. Deficiency of the endoplasmic reticulum stress response T-cell death-associated gene 51 (TDAG51) (TDAG51-/-) in mice promotes the development of high-fat diet (HFD)-induced obesity, fatty liver, and hepatic insulin resistance. However, whether this effect is due specifically to hepatic TDAG51 deficiency is unknown. Here, we report that hepatic TDAG51 protein levels are consistently reduced in multiple mouse models of liver steatosis and injury as well as in liver biopsies from patients with liver disease compared to normal controls. Delivery of a liver-specific adeno-associated virus (AAV) increased hepatic expression of a TDAG51-GFP fusion protein in WT, TDAG51-/-, and leptin-deficient (ob/ob) mice. Restoration of hepatic TDAG51 protein was sufficient to increase insulin sensitivity while reducing body weight and fatty liver in HFD fed TDAG51-/- mice and in ob/ob mice. TDAG51-/- mice expressing ectopic TDAG51 display improved Akt (Ser473) phosphorylation, post-insulin stimulation. HFD-fed TDAG51-/- mice treated with AAV-TDAG51-GFP displayed reduced lipogenic gene expression, increased beta-oxidation and lowered hepatic and serum triglycerides, findings consistent with reduced liver weight. Further, AAV-TDAG51-GFP-treated TDAG51-/- mice exhibited reduced hepatic precursor and cleaved sterol regulatory-element binding proteins (SREBP-1 and SREBP-2). In vitro studies confirmed the lipid-lowering effect of TDAG51 overexpression in oleic acid-treated Huh7 cells. These studies suggest that maintaining hepatic TDAG51 protein levels represents a viable therapeutic approach for the treatment of obesity and insulin resistance associated with nonalcoholic fatty liver disease.
Collapse
Affiliation(s)
- Tamana R Yousof
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Celeste C Bouchard
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Mihnea Alb
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Edward G Lynn
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Sárka Lhoták
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Hua Jiang
- Department of Pediatrics, School of Medicine, University of Colorado Health Sciences Center, Aurora, Colorado, USA
| | - Melissa MacDonald
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Hui Li
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, USA
| | - Jae H Byun
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | - Yumna Makda
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada
| | | | - Kenneth N Maclean
- Department of Pediatrics, School of Medicine, University of Colorado Health Sciences Center, Aurora, Colorado, USA
| | - Nathan J Cherrington
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, USA
| | - Asghar Naqvi
- Department of Pathology and Molecular Medicine, St. Joseph's Healthcare Hamilton, McMaster University, Hamilton, Ontario, Canada
| | - Suleiman A Igdoura
- Department of Biology, McMaster University, Hamilton, Ontario, Canada; Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Joan C Krepinsky
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada; Centre for Metabolism, Obesity and Diabetes Research, McMaster University, Hamilton, Ontario, Canada
| | - Gregory R Steinberg
- Centre for Metabolism, Obesity and Diabetes Research, McMaster University, Hamilton, Ontario, Canada; Division of Endocrinology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Richard C Austin
- Division of Nephrology, Department of Medicine, The Research Institute of St. Joe's Hamilton and the Hamilton Centre for Kidney Research, McMaster University, Hamilton, Ontario, Canada; Centre for Metabolism, Obesity and Diabetes Research, McMaster University, Hamilton, Ontario, Canada.
| |
Collapse
|
3
|
Oanh HT, Hoai Thu NT, Van Hanh N, Hoang MH, Minh Hien HT. Co-encapsulated astaxanthin and kaempferol nanoparticles: fabrication, characterization, and their potential synergistic effects on treating non-alcoholic fatty liver disease. RSC Adv 2023; 13:35127-35136. [PMID: 38046630 PMCID: PMC10691322 DOI: 10.1039/d3ra06537e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/14/2023] [Indexed: 12/05/2023] Open
Abstract
Astaxanthin and kaempferol, renowned natural compounds, possess potent antioxidant properties and exhibit remarkable biological activities. However, their poor water solubility, low stability, and limited bioavailability are the primary bottlenecks that restrict their utilization in pharmaceuticals and functional foods. To overcome these drawbacks, this study aims to fabricate astaxanthin/kaempferol co-encapsulated nanoparticles and investigate their synergistic effects on reducing the risk of stress oxidation, chronic inflammation, and lipid accumulation in RAW264.7 and HepG2 cells. The synthesized astaxanthin/kaempferol nanoparticles exhibited well-defined spherical morphology with an average particle diameter ranging from 74 to 120 nm. These nanoparticles demonstrated excellent stability with the remaining astaxanthin content ranging from 82.5% to 92.1% after 6 months of storage at 4 °C. Nanoastaxanthin/kaempferol displayed high dispersibility and stability in aqueous solutions, resulting in a significant enhancement of their bioactivity. In vitro assessments on cell lines revealed that nanoastaxanthin/kaempferol enhanced the inhibition of H2O2-induced oxidative stress in HepG2 and LPS-induced NO production in RAW264.7 compared to nanoastaxanthin. Additionally, these nanoparticles reduced the expression of genes involved in inflammation (iNOS, IL-6 and TNF-α). Moreover, hepatocytes treated with nanoastaxanthin/kaempferol showed a reduction in lipid content compared to those treated with nanoastaxanthin, through enhanced regulation of lipid metabolism-related genes. Overall, these findings suggest that the successful fabrication of co-encapsulated nanoparticles containing astaxanthin and kaempferol holds promising therapeutic potential in the treatment of non-alcoholic fatty liver disease.
Collapse
Affiliation(s)
- Ho Thi Oanh
- Institute of Chemistry, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
| | - Ngo Thi Hoai Thu
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
| | - Nguyen Van Hanh
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
| | - Mai Ha Hoang
- Institute of Chemistry, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
| | - Hoang Thi Minh Hien
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Cau Giay 10072 Hanoi Vietnam
| |
Collapse
|
4
|
Varghese DS, Oommen D, John A, Ali BR. GRP78/BiP alleviates oxLDL-induced hepatotoxicity in familial hypercholesterolemia caused by missense variants of LDLR in a HepG2 cellular model. Lipids Health Dis 2023; 22:69. [PMID: 37248472 DOI: 10.1186/s12944-023-01835-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/13/2023] [Indexed: 05/31/2023] Open
Abstract
BACKGROUND AND AIMS The accumulation of misfolded proteins, encoded by genetic variants of functional genes leads to Endoplasmic Reticulum (ER) stress, which is a critical consequence in human disorders such as familial hypercholesterolemia, cardiovascular and hepatic diseases. In addition to the identification of ER stress as a contributing factor to pathogenicity, extensive studies on the role of oxidized Low-Density Lipoprotein (oxLDL) and its ill effects in expediting cardiovascular diseases and other metabolic comorbidities are well documented. However, the current understanding of its role in hepatic insults needs to be revised. This study elucidates the molecular mechanisms underlying the progression of oxLDL and ER stress-induced cytotoxicity in HepG2. METHODS HepG2 cells stably expressing wild-type Low-Density lipoprotein receptor (WT-LDLR) and missense variants of LDLR that are pathogenically associated with familial hypercholesterolemia were used as the in vitro models. The relative mRNA expression and protein profiles of ER stress sensors, inflammatory and apoptotic markers, together with cytotoxic assays and measurement of mitochondrial membrane potential, were carried out in HepG2 cells treated with 100 µg per ml oxLDL for 24 to 48 h. 1-way or 2-way ANOVA was used for statistical analyses of datasets. RESULTS ER stress responses are elicited along all three arms of the unfolded protein response (UPR), with adverse cytotoxic and inflammatory responses in oxLDL-treated conditions. Interestingly, oxLDL-treated ER-stressed HepG2 cells manifested intriguingly low expression of BiP- the master regulator of ER stress, as observed earlier by various researchers in liver biopsies of Non-Alcoholic Steatohepatitis (NASH) patients. This study shows that overexpression of BiP rescues hepatic cells from cytotoxic and inflammatory mechanisms instigated by ER stress in combination with oxLDL, along the ER and mitochondrial membrane and restores cellular homeostasis. CONCLUSION The data provide interesting leads that identify patients with familial hypercholesterolemia conditions and potentially other Endoplasmic Reticulum Associated Degradation (ERAD) diseases as highly susceptible to developing hepatic insults with molecular signatures like those manifested in Non-Alcoholic Fatty Liver Disease (NAFLD) and NASH. LIMITATIONS AND FUTURE PERSPECTIVES Although the use of HepG2 cells as the model is a major caveat of the study, the findings of this research may be used as the pilot study to expand further investigations in primary hepatocytes or iPSC- derived cellular models.
Collapse
Affiliation(s)
- Divya Saro Varghese
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Deepu Oommen
- Present Address: Indian Institute of Science, C V Raman Road, 560012, Bangalore, India
| | - Anne John
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Bassam R Ali
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates.
- Zayed Centre for Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates.
| |
Collapse
|
5
|
Chen H, Tan H, Wan J, Zeng Y, Wang J, Wang H, Lu X. PPAR-γ signaling in nonalcoholic fatty liver disease: Pathogenesis and therapeutic targets. Pharmacol Ther 2023; 245:108391. [PMID: 36963510 DOI: 10.1016/j.pharmthera.2023.108391] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/20/2023] [Accepted: 03/20/2023] [Indexed: 03/26/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD), currently the leading cause of global chronic liver disease, has emerged as a major public health problem, more efficient therapeutics of which are thus urgently needed. Peroxisome proliferator-activated receptor γ (PPAR-γ), ligand-activated transcription factors of the nuclear hormone receptor superfamily, is considered a crucial metabolic regulator of hepatic lipid metabolism and inflammation. The role of PPAR-γ in the pathogenesis of NAFLD is gradually being recognized. Here, we outline the involvement of PPAR-γ in the pathogenesis of NAFLD through adipogenesis, insulin resistance, inflammation, oxidative stress, endoplasmic reticulum stress, and fibrosis. In addition, the evidence for PPAR-γ- targeted therapy for NAFLD are summarized. Altogether, PPAR-γ is a promising therapeutic target for NAFLD, and the development of drugs that can balance the beneficial and undesirable effects of PPAR-γ will bring new light to NAFLD patients.
Collapse
Affiliation(s)
- Hao Chen
- Department of Liver Surgery and Laboratory of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Huabing Tan
- Department of Infectious Diseases, Liver Disease Laboratory, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei, China
| | - Juan Wan
- West China Center of Excellence for Pancreatitis, Institute of Integrated Traditional Chinese and Western Medicine / West China School of Nursing, Sichuan University, Chengdu, China
| | - Yong Zeng
- Department of Liver Surgery and Laboratory of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Jincheng Wang
- Department of General Surgery, Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Haichuan Wang
- Department of Liver Surgery and Laboratory of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China; Department of Bioengineering and Therapeutic Sciences and Liver Center, University of California, San Francisco, CA, USA.
| | - Xiaojie Lu
- Department of General Surgery, Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China.
| |
Collapse
|
6
|
Inaba Y, Hashiuchi E, Watanabe H, Kimura K, Oshima Y, Tsuchiya K, Murai S, Takahashi C, Matsumoto M, Kitajima S, Yamamoto Y, Honda M, Asahara SI, Ravnskjaer K, Horike SI, Kaneko S, Kasuga M, Nakano H, Harada K, Inoue H. The transcription factor ATF3 switches cell death from apoptosis to necroptosis in hepatic steatosis in male mice. Nat Commun 2023; 14:167. [PMID: 36690638 PMCID: PMC9871012 DOI: 10.1038/s41467-023-35804-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 01/03/2023] [Indexed: 01/24/2023] Open
Abstract
Hepatocellular death increases with hepatic steatosis aggravation, although its regulation remains unclear. Here we show that hepatic steatosis aggravation shifts the hepatocellular death mode from apoptosis to necroptosis, causing increased hepatocellular death. Our results reveal that the transcription factor ATF3 acts as a master regulator in this shift by inducing expression of RIPK3, a regulator of necroptosis. In severe hepatic steatosis, after partial hepatectomy, hepatic ATF3-deficient or -overexpressing mice display decreased or increased RIPK3 expression and necroptosis, respectively. In cultured hepatocytes, ATF3 changes TNFα-dependent cell death mode from apoptosis to necroptosis, as revealed by live-cell imaging. In non-alcoholic steatohepatitis (NASH) mice, hepatic ATF3 deficiency suppresses RIPK3 expression and hepatocellular death. In human NASH, hepatocellular damage is correlated with the frequency of hepatocytes expressing ATF3 or RIPK3, which overlap frequently. ATF3-dependent RIPK3 induction, causing a modal shift of hepatocellular death, can be a therapeutic target for steatosis-induced liver damage, including NASH.
Collapse
Affiliation(s)
- Yuka Inaba
- Metabolism and Nutrition Research Unit, Institute for Frontier Science Initiative, Kanazawa University, Kanazawa, Japan
- Department of Physiology and Metabolism, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Emi Hashiuchi
- Department of Physiology and Metabolism, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Hitoshi Watanabe
- Metabolism and Nutrition Research Unit, Institute for Frontier Science Initiative, Kanazawa University, Kanazawa, Japan
| | - Kumi Kimura
- Department of Biochemistry and Molecular Vascular Biology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Yu Oshima
- Department of Biochemistry and Molecular Vascular Biology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Kohsuke Tsuchiya
- Division of Immunology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kanazawa, Japan
| | - Shin Murai
- Department of Biochemistry, Toho University School of Medicine, Tokyo, Japan
| | - Chiaki Takahashi
- Division of Oncology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kanazawa, Japan
| | - Michihiro Matsumoto
- Department of Molecular Metabolic Regulation, Diabetes Research Center, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Shigetaka Kitajima
- Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yasuhiko Yamamoto
- Department of Biochemistry and Molecular Vascular Biology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Masao Honda
- Department of Gastroenterology, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
- Department of Clinical Laboratory Medicine, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan
| | - Shun-Ichiro Asahara
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Kim Ravnskjaer
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark
- Center for Functional Genomics and Tissue Plasticity (ATLAS), University of Southern Denmark, Odense M, Denmark
| | - Shin-Ichi Horike
- Research Center for Experimental Modeling of Human Disease, Kanazawa University, Kanazawa, Japan
| | - Shuichi Kaneko
- Department of Gastroenterology, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
| | - Masato Kasuga
- The Institute of Medical Science, Asahi Life Foundation, Tokyo, Japan
| | - Hiroyasu Nakano
- Department of Biochemistry, Toho University School of Medicine, Tokyo, Japan
| | - Kenichi Harada
- Departments of Human Pathology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Hiroshi Inoue
- Metabolism and Nutrition Research Unit, Institute for Frontier Science Initiative, Kanazawa University, Kanazawa, Japan.
- Department of Physiology and Metabolism, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan.
| |
Collapse
|
7
|
Zhou S, Rao Z, Xia Y, Wang Q, Liu Z, Wang P, Cheng F, Zhou H. CCAAT/Enhancer-binding Protein Homologous Protein Promotes ROS-mediated Liver Ischemia and Reperfusion Injury by Inhibiting Mitophagy in Hepatocytes. Transplantation 2023; 107:129-139. [PMID: 35821597 PMCID: PMC9746334 DOI: 10.1097/tp.0000000000004244] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/28/2022] [Accepted: 05/19/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND Liver ischemia and reperfusion (IR) injury represent a major risk factor in both partial hepatectomy and liver transplantation. CCAAT/enhancer-binding protein homologous protein (CHOP) is a key regulator of cell death, its precise molecular basis in regulating hepatocyte death during liver IR has not been delineated. METHODS Hepatocellular CHOP deficient mice were generated by bone marrow chimera models using global CHOP knockout mice. Liver partial warm ischemia model and hypoxia/reoxygenation model of primary hepatocytes were applied. Liver injury and mitophagy-related signaling pathways were investigated. IR-stressed patient liver tissues and serum samples were analyzed as well. RESULTS Mice with hepatocellular CHOP deficiency exhibited alleviated cell death, decreased reactive oxygen species (ROS) expression, and enhanced mitophagy in hepatocytes after IR, confirmed by in vitro studies of hepatocytes after hypoxia/reoxygenation. Mitochondria ROS scavenge by Mito TEMPO effectively attenuated hepatocyte death and liver IR injury of wild-type mice, whereas no significant effects were observed in hepatocellular CHOP -deficient mice. CHOP depletion upregulated dynamin-related protein 1 and Beclin-1 activation in the mitochondria of hepatocytes leading to enhanced mitophagy. Following IR, increased CHOP expression and impaired mitophagy activation were observed in the livers of patients undergoing hepatectomy. N-acetyl cysteine pretreatment significantly improved the liver function of patients after surgery. CONCLUSIONS IR-induced CHOP activation exacerbates ROS-mediated hepatocyte death by inhibiting dynamin-related protein 1-Beclin-1-dependent mitophagy.
Collapse
Affiliation(s)
- Shun Zhou
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| | - Zhuqing Rao
- Department of Anesthesiology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Yongxiang Xia
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| | - Qi Wang
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
- School of Medical, Southeast University, Nanjing, China
| | - Zheng Liu
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| | - Ping Wang
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| | - Feng Cheng
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| | - Haoming Zhou
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University; Laboratory of Liver Transplantation, Chinese Academy of Medical Sciences; Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China
| |
Collapse
|
8
|
Gao R, Wang H, Li T, Wang J, Ren Z, Cai N, Ai H, Li S, Lu Y, Zhu Y, Shuai X, He X, Shi G, Chen Y. Secreted MUP1 that reduced under ER stress attenuates ER stress induced insulin resistance through suppressing protein synthesis in hepatocytes. Pharmacol Res 2023; 187:106585. [PMID: 36455814 DOI: 10.1016/j.phrs.2022.106585] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/20/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022]
Abstract
Disturbed endoplasmic reticulum (ER) stress response driven by the excessive lipid accumulation in the liver is a characteristic feature in the pathogenesis of non-alcoholic fatty liver disease (NAFLD). Restoring metabolic homeostasis by targeting ER stress is a potentially therapeutic strategy for NAFLD. Here we aim to identify novel proteins or pathways involved in regulating ER stress response and therapeutic targets for alleviating NAFLD. Proteomic and transcriptomic analysis demonstrated that major urinary proteins (MUPs) were significantly reduced in the livers from NAFLD mouse models. Then we confirmed that MUP1, the major secreted form of MUPs, was reduced at mRNA and protein expression levels in hepatocytes both in vivo and in vitro under ER stress. We further illustrated that MUP1 protein levels in the urine were reduced in mice with NAFLD, which was reversed by GLP-1 receptor agonist treatment. To study the relationship between ER stress and MUP1 biology, our analysis demonstrated that MUP1 was misfolded and trapped in the ER under ER stress in vivo. Interestingly, we discovered that recombinant MUP1 treatment in hepatocytes increased calcium efflux from the ER, which resulted in transient ER stress response, including reduced protein synthesis. These responses facilitated the alleviation of chemical induced ER stress in hepatocytes, which was suggested as "pre-adaptive ER stress". Besides, recombinant MUP1 pretreatment also improved ER stress-induced insulin resistance in hepatocytes. Our findings revealed a novel and critical role of MUP1, and recombinant MUP1 or its potential derivates may serve as a promising therapeutic target for alleviating NAFLD.
Collapse
Affiliation(s)
- Rong Gao
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Heting Wang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Ting Li
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jin Wang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhitao Ren
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Nan Cai
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Heying Ai
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Shasha Li
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yan Lu
- Department of Clinical Immunology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yanhua Zhu
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Xintao Shuai
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China; Nanomedicine Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China; PCFM Lab of Ministry of Education, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou, China
| | - Xuemin He
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Guojun Shi
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China; Nanomedicine Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
| | - Yanming Chen
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, Guangzhou Key Laboratory of Mechanistic and Translational Obesity Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China; Nanomedicine Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
| |
Collapse
|
9
|
Wang M, Xu W, Yu J, Liu Y, Ma H, Ji C, Zhang C, Xue J, Li R, Cui H. Astaxanthin From Haematococcus pluvialis Prevents High-Fat Diet-Induced Hepatic Steatosis and Oxidative Stress in Mice by Gut-Liver Axis Modulating Properties. Front Nutr 2022; 9:840648. [PMID: 35495929 PMCID: PMC9039660 DOI: 10.3389/fnut.2022.840648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 03/01/2022] [Indexed: 12/12/2022] Open
Abstract
Scope Evidence is mounting that astaxanthin (ATX), a xanthophyll carotenoid, used as a nutritional supplement to prevent chronic metabolic diseases. The present study aims to identify the potential function of ATX supplementation in preventing steatohepatitis and hepatic oxidative stress in diet-induced obese mice. Methods and Results In this study, ATX as dose of 0.25, 0.5, and 0.75% have orally administered to mice along with a high-fat diet (HFD) to investigate the role of ATX in regulating liver lipid metabolism and gut microbiota. The study showed that ATX dose-dependently reduces body weight, lipid droplet formation, hepatic triglycerides and ameliorated hepatic steatosis and oxidative stress. 0.75% ATX altered the levels of 34 lipid metabolites related to hepatic cholesterol and fatty acid metabolism which might be associated with downregulation of lipogenesis-related genes and upregulation of bile acid biosynthesis-related genes. The result also revealed that ATX alleviates HFD-induced gut microbiota dysbiosis by significantly inhibiting the growth of obesity-related Parabacteroides and Desulfovibrio while promoting the growth of Allobaculum and Akkermansia. Conclusion The study results suggested that dietary ATX may prevent the development of hepatic steatosis and oxidative stress with the risk of metabolic disease by gut-liver axis modulating properties.
Collapse
Affiliation(s)
- Meng Wang
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Wenxin Xu
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Jie Yu
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Yingying Liu
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Haotian Ma
- Health Science Center, College of Forensic Sciences, Xi'an Jiaotong University, Xi'an, China
| | - Chunli Ji
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Chunhui Zhang
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Jinai Xue
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China
| | - Runzhi Li
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China.,State Key Laboratory of Integrative Sustainable Dryland Agriculture, Shanxi Agricultural University, Taiyuan, China
| | - Hongli Cui
- College of Agriculture, Institute of Molecular Agriculture and Bioenergy, Shanxi Agricultural University, Jinzhong, China.,State Key Laboratory of Integrative Sustainable Dryland Agriculture, Shanxi Agricultural University, Taiyuan, China
| |
Collapse
|
10
|
Mitochondria homeostasis: Biology and involvement in hepatic steatosis to NASH. Acta Pharmacol Sin 2022; 43:1141-1155. [PMID: 35105958 PMCID: PMC9061859 DOI: 10.1038/s41401-022-00864-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 01/09/2022] [Indexed: 12/13/2022] Open
Abstract
Mitochondrial biology and behavior are central to the physiology of liver. Multiple mitochondrial quality control mechanisms remodel mitochondrial homeostasis under physiological and pathological conditions. Mitochondrial dysfunction and damage induced by overnutrition lead to oxidative stress, inflammation, liver cell death, and collagen production, which advance hepatic steatosis to nonalcoholic steatohepatitis (NASH). Accumulating evidence suggests that specific interventions that target mitochondrial homeostasis, including energy metabolism, antioxidant effects, and mitochondrial quality control, have emerged as promising strategies for NASH treatment. However, clinical translation of these findings is challenging due to the complex and unclear mechanisms of mitochondrial homeostasis in the pathophysiology of NASH.
Collapse
|
11
|
Lipoprotein Levels in Early Adulthood and NAFLD in Midlife: The Coronary Artery Risk Development in Young Adults (CARDIA) Study. J Nutr Metab 2022; 2022:1727711. [PMID: 35462864 PMCID: PMC9023214 DOI: 10.1155/2022/1727711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/04/2022] [Accepted: 03/11/2022] [Indexed: 11/17/2022] Open
Abstract
Objective We evaluated the association of apolipoprotein B (apoB) with low-density lipoprotein cholesterol (LDL-C), non-high-density lipoprotein cholesterol (non-HDL-C), and triglycerides (TG) in early adulthood with concordant/discordant associations and midlife NAFLD. Methods Participants from the CARDIA study were included (n = 2,655; baseline mean age: 25.0, 59.1% female, and 48.6% black). NAFLD was defined as liver attenuation ≤40 Hounsfield units after excluding other causes of liver fat. Logistic regression models assessed the odds of Y25 NAFLD among tertiles of apoB, LDL-C, non-HDL-C, and TG and quartiles of the apoB/TG ratio. Discordance/concordance analyses examined the association of apoB with each lipid marker and Y25 NAFLD. Results The Y25 NAFLD prevalence was 10%. The high-tertile TG group (OR 1.87, 95% CI, and 1.30–2.69) and the low- (OR 1.98, 95% CI, and 1.30–3.01) and middle-apoB/TG ratio groups (OR 1.78, 95% CI, and 1.17–2.72) had the greatest odds of midlife NAFLD. Using discordance/concordance analysis, the high-apoB/high-TG group had the highest odds of NAFLD (OR 1.69, 95% CI, and 1.09–2.61) followed by the low-apoB/high-TG group. The high apoB/low TG group had the lowest odds of NAFLD. Conclusions Among the studied lipid markers in early adulthood, TG levels have the strongest and most consistent association with midlife NAFLD.
Collapse
|
12
|
Characterization and Roles of Membrane Lipids in Fatty Liver Disease. MEMBRANES 2022; 12:membranes12040410. [PMID: 35448380 PMCID: PMC9025760 DOI: 10.3390/membranes12040410] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 12/12/2022]
Abstract
Obesity has reached global epidemic proportions and it affects the development of insulin resistance, type 2 diabetes, fatty liver disease and other metabolic diseases. Membrane lipids are important structural and signaling components of the cell membrane. Recent studies highlight their importance in lipid homeostasis and are implicated in the pathogenesis of fatty liver disease. Here, we discuss the numerous membrane lipid species and their metabolites including, phospholipids, sphingolipids and cholesterol, and how dysregulation of their composition and physiology contribute to the development of fatty liver disease. The development of new genetic and pharmacological mouse models has shed light on the role of lipid species on various mechanisms/pathways; these lipids impact many aspects of the pathophysiology of fatty liver disease and could potentially be targeted for the treatment of fatty liver disease.
Collapse
|
13
|
Gao R, Wang J, He X, Wang T, Zhou L, Ren Z, Yang J, Xiang X, Wen S, Yu Z, Ai H, Wang Y, Liang H, Li S, Lu Y, Zhu Y, Shi G, Chen Y. Comprehensive analysis of endoplasmic reticulum-related and secretome gene expression profiles in the progression of non-alcoholic fatty liver disease. Front Endocrinol (Lausanne) 2022; 13:967016. [PMID: 36034446 PMCID: PMC9412753 DOI: 10.3389/fendo.2022.967016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Accepted: 07/25/2022] [Indexed: 11/13/2022] Open
Abstract
Endoplasmic reticulum (ER) is the principal organelle for protein synthesis, such as hepatokines and transmembrane proteins, and is critical for maintaining physiological function. Dysfunction of ER is associated with metabolic disorders. However, the role of ER homeostasis as well as hepatokines in the progression of non-alcoholic fatty liver disease (NAFLD) remains to be elucidated. Here we comprehensively analyzed the RNA-seq profiles of liver biopsies from 206 NAFLD patients and 10 controls from dataset GSE135251. The co-expression modules were constructed based on weighted gene co-expression network analysis and six co-expression modules were identified, of which brown module stood out to be significantly associated with fibrosis stage and NAFLD activity score (NAS). Subsequently, cytoscape with cytoHubba plugin was applied to identify hub genes in the brown module. GO and KEGG enrichment analysis of the top 20 hub genes were performed and showed the involvement of extracellular matrix formation, collagen synthesis and decomposition, etc. Further, the expression of the top 20 hub genes were found to be a consistent increasing trend as the fibrosis stages and NAS increased, which have been validated both in HFD fed and HFHC fed mice. Among these genes, THY1, PTGDS, TMPRSS3, SPON1, COL1A2, RHBDF1, COL3A1, COL5A1, COL1A1 and IGFBP7 performed well in distinguishing fibrosis stage, while COL1A2, COL3A1, THY1, RHBDF1 and COL1A2 exhibited good capacity to discriminate NAS. Besides, RHBDF1, COL3A1, QSOX1, STING1, COL5A1, IGFBP7, COL4A2, COL1A1, FKBP10 and COL1A2 also showed a strong power in the diagnosis of NAFLD. In addition, COL1A1, COL1A2, COL3A1, COL8A2, IGFBP7, PGF, PTGDS, SPON1, THY1 and TIMP1 were identified as secretome genes from the top 20 hub genes. Of them, circulated THY1 and collagen III level were validated to be significantly elevated in the MCD diet-induced mice. Thus, we provided a systemic view on understanding the pathological roles and mechanisms of ER as well as secretome in NAFLD progression. THY1, COL1A1, COL1A2, COL3A1 and RHBDF1 could be served as candidate biomarkers to evaluate the progression of NAFLD.
Collapse
Affiliation(s)
- Rong Gao
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jin Wang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Xuemin He
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Tongtong Wang
- Department of Clinical Immunology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Li Zhou
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhitao Ren
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jifeng Yang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Xiaoxin Xiang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Shiyi Wen
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhuojun Yu
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Heying Ai
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yuchan Wang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Hua Liang
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Shasha Li
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yan Lu
- Department of Clinical Immunology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yanhua Zhu
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Guojun Shi
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
- *Correspondence: Yanming Chen, ; Guojun Shi,
| | - Yanming Chen
- Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Diabetology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
- *Correspondence: Yanming Chen, ; Guojun Shi,
| |
Collapse
|
14
|
Kaspar S, Oertlin C, Szczepanowska K, Kukat A, Senft K, Lucas C, Brodesser S, Hatzoglou M, Larsson O, Topisirovic I, Trifunovic A. Adaptation to mitochondrial stress requires CHOP-directed tuning of ISR. SCIENCE ADVANCES 2021; 7:eabf0971. [PMID: 34039602 PMCID: PMC8153728 DOI: 10.1126/sciadv.abf0971] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 04/07/2021] [Indexed: 05/03/2023]
Abstract
In response to disturbed mitochondrial gene expression and protein synthesis, an adaptive transcriptional response sharing a signature of the integrated stress response (ISR) is activated. We report an intricate interplay between three transcription factors regulating the mitochondrial stress response: CHOP, C/EBPβ, and ATF4. We show that CHOP acts as a rheostat that attenuates prolonged ISR, prevents unfavorable metabolic alterations, and postpones the onset of mitochondrial cardiomyopathy. Upon mitochondrial dysfunction, CHOP interaction with C/EBPβ is needed to adjust ATF4 levels, thus preventing overactivation of the ATF4-regulated transcriptional program. Failure of this interaction switches ISR from an acute to a chronic state, leading to early respiratory chain deficiency, energy crisis, and premature death. Therefore, contrary to its previously proposed role as a transcriptional activator of mitochondrial unfolded protein response, our results highlight a role of CHOP in the fine-tuning of mitochondrial ISR in mammals.
Collapse
Affiliation(s)
- Sophie Kaspar
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
- Institute for Mitochondrial Diseases and Ageing, Medical Faculty and Center for Molecular Medicine Cologne (CMMC) , University of Cologne, D-50931 Cologne, Germany
| | - Christian Oertlin
- Department of Oncology-Pathology, Science for Life Laboratory, Karolinska Institute, Stockholm, Sweden
| | - Karolina Szczepanowska
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
- Institute for Mitochondrial Diseases and Ageing, Medical Faculty and Center for Molecular Medicine Cologne (CMMC) , University of Cologne, D-50931 Cologne, Germany
| | - Alexandra Kukat
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
- Institute for Mitochondrial Diseases and Ageing, Medical Faculty and Center for Molecular Medicine Cologne (CMMC) , University of Cologne, D-50931 Cologne, Germany
| | - Katharina Senft
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
- Institute for Mitochondrial Diseases and Ageing, Medical Faculty and Center for Molecular Medicine Cologne (CMMC) , University of Cologne, D-50931 Cologne, Germany
| | - Christina Lucas
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
| | - Susanne Brodesser
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany
| | - Maria Hatzoglou
- Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Ola Larsson
- Department of Oncology-Pathology, Science for Life Laboratory, Karolinska Institute, Stockholm, Sweden
| | - Ivan Topisirovic
- Lady Davis Institute, SMBD Jewish General Hospital, Gerald Bronfman Department of Oncology and Departments of Experimental Medicine and Biochemistry, McGill University, Montreal, Canada
| | - Aleksandra Trifunovic
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-Associated Diseases (CECAD), Medical Faculty, University of Cologne, D-50931 Cologne, Germany.
- Institute for Mitochondrial Diseases and Ageing, Medical Faculty and Center for Molecular Medicine Cologne (CMMC) , University of Cologne, D-50931 Cologne, Germany
| |
Collapse
|
15
|
Yang M, Zhang D, Zhao Z, Sit J, Saint-Sume M, Shabandri O, Zhang K, Yin L, Tong X. Hepatic E4BP4 induction promotes lipid accumulation by suppressing AMPK signaling in response to chemical or diet-induced ER stress. FASEB J 2020; 34:13533-13547. [PMID: 32780887 DOI: 10.1096/fj.201903292rr] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 07/22/2020] [Accepted: 07/27/2020] [Indexed: 12/19/2022]
Abstract
Prolonged ER stress has been known to be one of the major drivers of impaired lipid homeostasis during the pathogenesis of non-alcoholic liver disease (NAFLD). However, the downstream mediators of ER stress pathway in promoting lipid accumulation remain poorly understood. Here, we present data showing the b-ZIP transcription factor E4BP4 in both the hepatocytes and the mouse liver is potently induced by the chemical ER stress inducer tunicamycin or by high-fat, low-methionine, and choline-deficient (HFLMCD) diet. We showed that such an induction is partially dependent on CHOP, a known mediator of ER stress and requires the E-box element of the E4bp4 promoter. Tunicamycin promotes the lipid droplet formation and alters lipid metabolic gene expression in primary mouse hepatocytes from E4bp4flox/flox but not E4bp4 liver-specific KO (E4bp4-LKO) mice. Compared with E4bp4flox/flox mice, E4bp4-LKO female mice exhibit reduced liver lipid accumulation and partially improved liver function after 10-week HFLMCD diet feeding. Mechanistically, we observed elevated AMPK activity and the AMPKβ1 abundance in the liver of E4bp4-LKO mice. We have evidence supporting that E4BP4 may suppress the AMPK activity via promoting the AMPKβ1 ubiquitination and degradation. Furthermore, acute depletion of the Ampkβ1 subunit restores lipid droplet formation in E4bp4-LKO primary mouse hepatocytes. Our study highlighted hepatic E4BP4 as a key factor linking ER stress and lipid accumulation in the liver. Targeting E4BP4 in the liver may be a novel therapeutic avenue for treating NAFLD.
Collapse
Affiliation(s)
- Meichan Yang
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA.,Department of Infectious Diseases, The Second Xiangya Hospital, Central South University, Changsha, P.R. China
| | - Deqiang Zhang
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Zifeng Zhao
- Department of Pharmacology of Chinese Materia, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, P.R. China
| | - Julian Sit
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | | | - Omar Shabandri
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Kezhong Zhang
- Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI, USA
| | - Lei Yin
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Xin Tong
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| |
Collapse
|
16
|
Novel Combinatorial Regimen of Garcinol and Curcuminoids for Non-alcoholic Steatohepatitis (NASH) in Mice. Sci Rep 2020; 10:7440. [PMID: 32366854 PMCID: PMC7198554 DOI: 10.1038/s41598-020-64293-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 04/12/2020] [Indexed: 02/07/2023] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is a progressive form of Non-alcoholic fatty liver disease (NAFLD), a chronic liver disease with a significant unmet clinical need. In this study, we examined the protective effects of Garcinia indica extract standardized to contain 20% w/w of Garcinol (GIE) and 95% Curcuminoids w/w from Curcuma longa (Curcuminoids) in a Stelic animal model (STAM) of NASH. The STAM mice developed steatosis, hepatocyte ballooning, and inflammation, which were significantly reduced by the combination of GIE and Curcuminoids, resulting in a lower NAFLD activity score. The treatment reduced fibrosis as observed by Sirius red staining, liver hydroxyproline content and mRNA levels of TGF- β and collagen in the liver. Immunostaining with alpha-smooth muscle actin (α SMA) revealed a significant reduction in hepatic stellate cells. Intriguingly, the combination regimen markedly decreased the mRNA levels of MCP1 and CRP and both mRNA and protein levels of TNF-α. NF-kB, reduced the hepatic and circulating FGF21 levels and altered the nonenzymatic (glutathione) and enzymatic antioxidant markers (Glutathione peroxidase, and superoxide dismutase). Our results suggest that the combination of GIE and Curcuminoids can reduce the severity of NASH by reducing steatosis, fibrosis, oxidative stress, and inflammation. The results suggest that the combinatorial regimen could be an effective supplement to prevent the progression of liver steatosis to inflammation and fibrosis in NASH.
Collapse
|
17
|
Abo El-khair SM, Ghoneim FM, Shabaan DA, Elsamanoudy AZ. Molecular and ultrastructure study of endoplasmic reticulum stress in hepatic steatosis: role of hepatocyte nuclear factor 4α and inflammatory mediators. Histochem Cell Biol 2019; 153:49-62. [DOI: 10.1007/s00418-019-01823-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/04/2019] [Indexed: 12/15/2022]
|
18
|
Huang XT, Liu W, Zhou Y, Sun M, Sun CC, Zhang CY, Tang SY. Endoplasmic reticulum stress contributes to NMDA-induced pancreatic β-cell dysfunction in a CHOP-dependent manner. Life Sci 2019; 232:116612. [PMID: 31260687 DOI: 10.1016/j.lfs.2019.116612] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 06/17/2019] [Accepted: 06/27/2019] [Indexed: 01/09/2023]
Abstract
AIMS Accumulating evidence suggest that endoplasmic reticulum (ER) stress is an important mechanism underlying the development of diabetes. We have reported that sustained treatment with N-methyl-d-aspartate (NMDA) results in apoptotic β-cell death and impairs insulin secretion. However, the molecular mechanism responsible for NMDA-induced β-cell dysfunction remains largely obscure. Thus, this study aimed to determine whether sustained activation of NMDA receptors (NMDARs) causes β-cell dysfunction through ER stress. MAIN METHODS Primary mouse islets and MIN6 mouse pancreatic β-cells were treated with NMDA for 24 h or high-glucose for 72 h. After the treatment, glucose-stimulated insulin secretion (GSIS) and the expression of ER stress markers were measured, respectively. In vivo, the expression of ER stress markers was measured in the pancreas of diabetic mice treated with or without NMDARs inhibitor Memantine. KEY FINDINGS NMDA treatment caused an increase in the expression of ER stress markers (ATF4, CHOP, GRP78, and Xbp1s) in primary islets. While, tauroursodeoxycholic acid (TUDCA), an inhibitor of ER stress, significantly attenuated NMDA-induced β-cell dysfunction, including the loss of glucose-stimulated insulin secretion and reduction of pancreas duodenum homeobox factor-1 (Pdx-1) mRNA expression, a transcription factor regulating insulin synthesis. Besides, NMDA-induced ER stress strongly promoted pro-inflammatory cytokines synthesis (IL-1β and TNF-α) in β cells. Interestingly, knockdown of CHOP attenuated β-cell dysfunction evoked by NMDA. Furthermore, we demonstrated that blockade of NMDARs ameliorated high-glucose-induced ER stress in vitro and in vivo. SIGNIFICANCE This study confirms that ER stress is actively involved in the activation of NMDARs-related β-cell dysfunction.
Collapse
Affiliation(s)
- Xiao-Ting Huang
- Xiangya Nursing School, Central South University, Changsha, Hunan, China
| | - Wei Liu
- Xiangya Nursing School, Central South University, Changsha, Hunan, China
| | - Yong Zhou
- Department of Physiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Mei Sun
- Xiangya Nursing School, Central South University, Changsha, Hunan, China
| | - Chen-Chen Sun
- Department of Physiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Chen-Yu Zhang
- Department of Physiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Si-Yuan Tang
- Xiangya Nursing School, Central South University, Changsha, Hunan, China.
| |
Collapse
|
19
|
Chen X, Chan H, Zhang L, Liu X, Ho IHT, Zhang X, Ho J, Hu W, Tian Y, Kou S, Chan CS, Yu J, Wong SH, Gin T, Chan MTV, Sun X, Wu WKK. The phytochemical polydatin ameliorates non-alcoholic steatohepatitis by restoring lysosomal function and autophagic flux. J Cell Mol Med 2019; 23:4290-4300. [PMID: 30973211 PMCID: PMC6533566 DOI: 10.1111/jcmm.14320] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 02/12/2019] [Accepted: 03/26/2019] [Indexed: 12/24/2022] Open
Abstract
Impaired autophagic degradation of intracellular lipids is causally linked to the development of non‐alcoholic steatohepatitis (NASH). Pharmacological agents that can restore hepatic autophagic flux could therefore have therapeutic potentials for this increasingly prevalent disease. Herein, we investigated the effects of polydatin, a natural precursor of resveratrol, in a murine nutritional model of NASH and a cell line model of steatosis. Results showed that oral administration of polydatin protected against hepatic lipid accumulation and alleviated inflammation and hepatocyte damage in db/db mice fed methionine‐choline deficient diet. Polydatin also alleviated palmitic acid‐induced lipid accumulation in cultured hepatocytes. In both models, polydatin restored lysosomal function and autophagic flux that were impaired by NASH or steatosis. Mechanistically, polydatin inhibited mTOR signalling and up‐regulated the expression and activity of TFEB, a known master regulator of lysosomal function. In conclusion, polydatin ameliorated NASH through restoring autophagic flux. The polydatin‐regulated autophagy was associated with inhibition of mTOR pathway and restoration of lysosomal function by TFEB. Our study provided affirmative preclinical evidence to inform future clinical trials for examining the potential anti‐NASH effect of polydatin in humans.
Collapse
Affiliation(s)
- Xiaoting Chen
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, People's Republic of China.,Zhujiang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Hung Chan
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Lin Zhang
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong.,State Key Laboratory of Digestive Diseases, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong.,CUHK Shenzhen Research Institute, Shenzhen, People's Republic of China
| | - Xiaodong Liu
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Idy H T Ho
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Xiang Zhang
- State Key Laboratory of Digestive Diseases, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong.,Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Jeffery Ho
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Wei Hu
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Yuanyuan Tian
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Shanglong Kou
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Chee Sam Chan
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Jun Yu
- State Key Laboratory of Digestive Diseases, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong.,CUHK Shenzhen Research Institute, Shenzhen, People's Republic of China.,Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Sunny H Wong
- State Key Laboratory of Digestive Diseases, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong.,CUHK Shenzhen Research Institute, Shenzhen, People's Republic of China.,Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Tony Gin
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Matthew T V Chan
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Xuegang Sun
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, People's Republic of China
| | - William K K Wu
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Shatin, Hong Kong.,State Key Laboratory of Digestive Diseases, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong.,CUHK Shenzhen Research Institute, Shenzhen, People's Republic of China
| |
Collapse
|
20
|
Hu H, Peng L, Jiang H, Shen H, Zhou P, Gao Y. Silenced CHOP protects pancreatic B‐cell function by targeting peroxisome proliferator‐activated receptor‐γ coactivator‐1α through nuclear factor‐κB signaling pathway in diabetes mellitus. J Cell Biochem 2019; 120:12595-12603. [PMID: 30848505 DOI: 10.1002/jcb.28526] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 12/03/2018] [Accepted: 12/06/2018] [Indexed: 12/25/2022]
Affiliation(s)
- Hao Hu
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| | - Lingling Peng
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| | - Haiyan Jiang
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| | - Haijun Shen
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| | - Ping Zhou
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| | - Yunming Gao
- Department of Endocrinology The Second People's Hospital of Lianyungang Lianyungang China
| |
Collapse
|
21
|
Liu W, Ye C, Cheng Q, Zhang X, Yao L, Li Q, Huang J, Liu Y, Zou Z, Wang H, Yan J, Zhu Y, Wang C, Ai D. Macrophage Raptor Deficiency-Induced Lysosome Dysfunction Exacerbates Nonalcoholic Steatohepatitis. Cell Mol Gastroenterol Hepatol 2018; 7:211-231. [PMID: 30539788 PMCID: PMC6282883 DOI: 10.1016/j.jcmgh.2018.09.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 09/11/2018] [Accepted: 09/11/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Nonalcoholic steatohepatitis (NASH) is an increasingly prevalent nonalcoholic fatty liver disease, characterized by inflammatory cell infiltration and hepatocellular damage. Mammalian target of rapamycin complex 1 (mTORC1) has been investigated extensively in the context of cancer, including hepatocellular carcinoma. However, the role of mTORC1 in NASH remains largely unknown. METHODS mTORC1 activity in macrophages in human mild and severe NASH liver was compared. Mice with macrophage-specific deletion of the regulatory-associated protein of mTOR (Raptor) subunit and littermate controls were fed a high-fructose, palmitate, and cholesterol diet for 24 weeks or a methionine- and choline-deficient diet for 4 weeks to develop NASH. RESULTS We report that in human beings bearing NASH, macrophage mTORC1 activity was lower in livers experiencing severe vs mild NASH liver. Moreover, macrophage mTORC1 disruption exacerbated the inflammatory response in 2 diet-induced NASH mouse models. Mechanistically, in response to apoptotic hepatocytes (AHs), macrophage polarization toward a M2 anti-inflammatory phenotype was inhibited in Raptor-deficient macrophages. During the digestion of AHs, macrophage mTORC1 was activated and coupled with dynamin-related protein 1 to facilitate the latter's phosphorylation, leading to mitochondrial fission-mediated calcium release. Ionomycin or A23187, calcium ionophores, prevented Raptor deficiency-mediated failure of lysosome acidification and subsequent lipolysis. Blocking dynamin-related protein 1-dependent mitochondria fission impaired lysosome function, resulting in reduced production of anti-inflammatory factors such as interleukins 10 and 13. CONCLUSIONS Persistent mTORC1 deficiency in macrophages contributes to the progression of NASH by causing lysosome dysfunction and subsequently attenuating anti-inflammatory M2-like response in macrophages during clearance of AHs.
Collapse
Affiliation(s)
- Wenli Liu
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Chenji Ye
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Qian Cheng
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Xuejiao Zhang
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Liu Yao
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Qi Li
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Jing Huang
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Yajin Liu
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Zhengsheng Zou
- The Center for Non-infectious Liver Diseases, Beijing 302 Military Hospital, Beijing, China
| | - Hua Wang
- Department of Oncology, the First Affiliated Hospital, Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Jun Yan
- Department of Pathology, Tianjin First Center Hospital, Tianjin, China
| | - Yi Zhu
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Chunjiong Wang
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China.
| | - Ding Ai
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China.
| |
Collapse
|
22
|
Lebeaupin C, Vallée D, Rousseau D, Patouraux S, Bonnafous S, Adam G, Luciano F, Luci C, Anty R, Iannelli A, Marchetti S, Kroemer G, Lacas-Gervais S, Tran A, Gual P, Bailly-Maitre B. Bax inhibitor-1 protects from nonalcoholic steatohepatitis by limiting inositol-requiring enzyme 1 alpha signaling in mice. Hepatology 2018; 68:515-532. [PMID: 29457838 DOI: 10.1002/hep.29847] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 02/13/2018] [Accepted: 02/14/2018] [Indexed: 12/18/2022]
Abstract
UNLABELLED Endoplasmic reticulum (ER) stress is activated in nonalcoholic fatty liver disease (NAFLD), raising the possibility that ER stress-dependent metabolic dysfunction, inflammation, and cell death underlie the transition from steatosis to steatohepatitis (nonalcoholic steatohepatitis; NASH). B-cell lymphoma 2 (BCL2)-associated X protein (Bax) inhibitor-1 (BI-1), a negative regulator of the ER stress sensor, inositol-requiring enzyme 1 alpha (IRE1α), has yet to be explored in NAFLD as a hepatoprotective agent. We hypothesized that the genetic ablation of BI-1 would render the liver vulnerable to NASH because of unrestrained IRE1α signaling. ER stress was induced in wild-type and BI-1-/- mice acutely by tunicamycin (TM) injection (1 mg/kg) or chronically by high-fat diet (HFD) feeding to determine NAFLD phenotype. Livers of TM-treated BI-1-/- mice showed IRE1α-dependent NOD-like receptor family, pyrin domain containing 3 (NLRP3) inflammasome activation, hepatocyte death, fibrosis, and dysregulated lipid homeostasis that led to liver failure within a week. The analysis of human NAFLD liver biopsies revealed BI-1 down-regulation parallel to the up-regulation of IRE1α endoribonuclease (RNase) signaling. In HFD-fed BI-1-/- mice that presented NASH and type 2 diabetes, exaggerated hepatic IRE1α, X-box binding protein 1 (XBP1), and C/EBP homologous protein (CHOP) expression was linked to activated NLRP3 inflammasome and caspase-1/-11. Rises in interleukin (IL)-1β, IL-6, monocyte chemoattractant protein 1 (MCP1), chemokine (C-X-C motif) ligand 1 (CXCL1), and alanine transaminase (ALT)/aspartate transaminase (AST) levels revealed significant inflammation and injury, respectively. Pharmacological inhibition of IRE1α RNase activity with the small molecules, STF-083010 or 4μ8c, was evaluated in HFD-induced NAFLD. In BI-1-/- mice, either treatment effectively counteracted IRE1α RNase activity, improving glucose tolerance and rescuing from NASH. The hepatocyte-specific role of IRE1α RNase activity in mediating NLRP3 inflammasome activation and cell death was confirmed in primary mouse hepatocytes by IRE1α axis knockdown or its inhibition with STF-083010 or 4μ8c. CONCLUSION Targeting IRE1α-dependent NLRP3 inflammasome signaling with pharmacological agents or by BI-1 may represent a tangible therapeutic strategy for NASH. (Hepatology 2018).
Collapse
Affiliation(s)
| | - Déborah Vallée
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France
| | | | - Stéphanie Patouraux
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France.,Centre Hospitalier Universitaire Nice, Archet Hospital, Biology Department, Nice, France
| | - Stéphanie Bonnafous
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France.,Centre Hospitalier Universitaire Nice, Archet Hospital, Digestive Department, Nice, France
| | - Gilbert Adam
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France
| | | | - Carmelo Luci
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France
| | - Rodolphe Anty
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France.,Centre Hospitalier Universitaire Nice, Archet Hospital, Digestive Department, Nice, France
| | - Antonio Iannelli
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France.,Centre Hospitalier Universitaire Nice, Archet Hospital, Digestive Department, Nice, France
| | | | - Guido Kroemer
- University Paris Descartes, Sorbonne Paris Cité, Paris, France.,Team 11 certified Ligue Nationale contre le Cancer, Cordeliers Research Center, Paris, France.,INSERM, U1138, Paris, France.,University Pierre et Marie Curie, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus Villejuif, France.,Biology Department, Georges Pompidou European Hospital, AP-HP, Paris, France.,Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden
| | - Sandra Lacas-Gervais
- University Côte d'Azur, CCMA (Centre Commun de Microscopie Appliquée), Nice, France
| | - Albert Tran
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France.,Centre Hospitalier Universitaire Nice, Archet Hospital, Digestive Department, Nice, France
| | - Philippe Gual
- University Côte d'Azur, INSERM, U1065, C3M, Nice, France
| | | |
Collapse
|
23
|
Role of Oxidative Stress in Pathophysiology of Nonalcoholic Fatty Liver Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:9547613. [PMID: 29991976 PMCID: PMC6016172 DOI: 10.1155/2018/9547613] [Citation(s) in RCA: 419] [Impact Index Per Article: 69.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 05/23/2018] [Indexed: 02/06/2023]
Abstract
Liver steatosis without alcohol consumption, namely, nonalcoholic fatty liver disease (NAFLD), is a common hepatic condition that encompasses a wide spectrum of presentations, ranging from simple accumulation of triglycerides in the hepatocytes without any liver damage to inflammation, necrosis, ballooning, and fibrosis (namely, nonalcoholic steatohepatitis) up to severe liver disease and eventually cirrhosis and/or hepatocellular carcinoma. The pathophysiology of fatty liver and its progression is influenced by multiple factors (environmental and genetics), in a “multiple parallel-hit model,” in which oxidative stress plays a very likely primary role as the starting point of the hepatic and extrahepatic damage. The aim of this review is to give a comprehensive insight on the present researches and findings on the role of oxidative stress mechanisms in the pathogenesis and pathophysiology of NAFLD. With this aim, we evaluated the available data in basic science and clinical studies in this field, reviewing the most recent works published on this topic.
Collapse
|
24
|
Balachander GJ, Subramanian S, Ilango K. Rosmarinic acid attenuates hepatic steatosis by modulating ER stress and autophagy in oleic acid-induced HepG2 cells. RSC Adv 2018; 8:26656-26663. [PMID: 35547559 PMCID: PMC9087887 DOI: 10.1039/c8ra02849d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 06/23/2018] [Indexed: 12/13/2022] Open
Abstract
Non-alcoholic fatty acid disease (NAFLD) has become an emerging entity of liver disorders worldwide. Oxidative stress and deranged autophagy-induced endoplasmic reticulum (ER) stress has recently been recognized as one of the prime factors involved in the pathological mechanism underlying NAFLD and progressive non-alcoholic steato-hepatitis (NASH). Epidemiological and experimental data reveal the potency of dietary polyphenols in averting NAFLD. In this line, to analyse and address the underlying pathogenic mechanisms, in the present study, oleic acid-induced HepG2 cells were treated with rosmarinic acid (RA), a dietary polyphenol with well-established cytoprotective properties. Treatment with rosmarinic acid (20 μg) was found to potently counter the elevated levels of total cholesterol (TC) and triglycerides (TG). Additionally, exposure of oleic acid-induced HepG2 cells to rosmarinic acid showed reduced levels of ROS and increased activity of enzymic and non-enzymic antioxidants. The steatotic HepG2 cells presented a pronounced increase in the expression of key ER stress markers such as p-PERK, p-IRE-1, ATF-6, p-eIF-α and CHOP, which was considerably reduced upon treatment with rosmarinic acid. Moreover, exposure to rosmarinic acid altered the deranged autophagic mechanism in oleic acid-induced HepG2 cells, which was observed via the protein expression of Beclin 1, LC31, ATG5 and ATG7. This study demonstrates that rosmarinic acid abrogates NAFLD via diminishing ER stress by nullifying oxidative stress and restoring deranged autophagy and can be used as a potent adjunct in the treatment of NAFLD, thus illustrating the valuable application of polyphenols in combating NAFLD. Non-alcoholic fatty acid disease (NAFLD) has become an emerging entity of liver disorders worldwide.![]()
Collapse
Affiliation(s)
- Govindaraj Jayanthy Balachander
- Molecular Biology Division
- Interdisciplinary Institute of Indian System of Medicine (IIISM)
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | | | - Kaliappan Ilango
- Molecular Biology Division
- Interdisciplinary Institute of Indian System of Medicine (IIISM)
- SRM Institute of Science and Technology
- Kattankulathur
- India
| |
Collapse
|
25
|
Abstract
Numerous environmental, physiological, and pathological insults disrupt protein-folding homeostasis in the endoplasmic reticulum (ER), referred to as ER stress. Eukaryotic cells evolved a set of intracellular signaling pathways, collectively termed the unfolded protein response (UPR), to maintain a productive ER protein-folding environment through reprogramming gene transcription and mRNA translation. The UPR is largely dependent on transcription factors (TFs) that modulate expression of genes involved in many physiological and pathological conditions, including development, metabolism, inflammation, neurodegenerative diseases, and cancer. Here we summarize the current knowledge about these mechanisms, their impact on physiological/pathological processes, and potential therapeutic applications.
Collapse
Affiliation(s)
- Jaeseok Han
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheonan-si, Choongchungnam-do 31151, Republic of Korea
| | - Randal J Kaufman
- Degenerative Diseases Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, 92307 USA
| |
Collapse
|
26
|
Lee S, Kim S, Hwang S, Cherrington NJ, Ryu DY. Dysregulated expression of proteins associated with ER stress, autophagy and apoptosis in tissues from nonalcoholic fatty liver disease. Oncotarget 2017; 8:63370-63381. [PMID: 28968997 PMCID: PMC5609929 DOI: 10.18632/oncotarget.18812] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 06/04/2017] [Indexed: 01/23/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is categorized into nonalcoholic fatty liver (NAFL) and nonalcoholic steatohepatitis (NASH) and has emerged as a risk factor for more critical clinical conditions. However, the underlying mechanisms of NAFLD pathogenesis are not fully understood. In this study, expression of proteins associated with endoplasmic reticulum (ER) stress, apoptosis and autophagy were analyzed in normal, NAFL and NASH human livers by western blotting. Levels of some ER stress-transducing transcription factors, including cleaved activating transcription factor 6, were higher in NASH than in the normal tissues. However, the expression of a majority of the ER chaperones and foldases analyzed, including glucose-regulated protein 78 and ER protein 44, was lower in NASH than in the normal tissues. Levels of apoptosis markers, such as cleaved poly (ADP-ribose) polymerase, were also lower in NASH tissues, in which expression of some B-cell lymphoma-2 family proteins was up- or down-regulated compared to the normal tissues. The level of the autophagy substrate p62 was not different in NASH and normal tissues, although some autophagy regulators were up- or down-regulated in the NASH tissues compared to the normal tissues. Levels of most of the proteins analyzed in NAFL tissues were either similar to those in one of the other two types, NASH and normal, or were somewhere in between. Together, these findings suggest that regulation of certain important tissues processes involved in protein quality control and cell survival were broadly compromised in the NAFLD tissues.
Collapse
Affiliation(s)
- Seungwoo Lee
- BK21 Plus Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Soohee Kim
- BK21 Plus Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Seungwoo Hwang
- Korean Bioinformation Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea
| | | | - Doug-Young Ryu
- BK21 Plus Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea
| |
Collapse
|
27
|
Takahara I, Akazawa Y, Tabuchi M, Matsuda K, Miyaaki H, Kido Y, Kanda Y, Taura N, Ohnita K, Takeshima F, Sakai Y, Eguchi S, Nakashima M, Nakao K. Toyocamycin attenuates free fatty acid-induced hepatic steatosis and apoptosis in cultured hepatocytes and ameliorates nonalcoholic fatty liver disease in mice. PLoS One 2017; 12:e0170591. [PMID: 28278289 PMCID: PMC5344317 DOI: 10.1371/journal.pone.0170591] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 01/06/2017] [Indexed: 12/25/2022] Open
Abstract
Background and aims A high serum level of saturated free fatty acids (FFAs) is associated with the development of nonalcoholic fatty liver disease (NAFLD). X-box binding protein-1 (XBP-1) is activated by FFA treatment upon splicing. XBP-1 is a transcription factor induced by the endoplasmic reticulum (ER) stress sensor endoribonuclease inositol-requiring enzyme 1 alpha (IRE1α). However, the role of XBP-1 in NAFLD remains relatively unexplored. Toyocamycin was recently reported to attenuate the activation of XBP-1, possibly by inducing a conformational change in IRE1α. In this study, we examined the effect of toyocamycin on hepatocyte lipoapoptosis and steatosis. We also explored the effects of toyocamycin in a mouse model of NAFLD. Methods Huh-7 cells and isolated rat primary hepatocytes were treated with palmitic acid (PA), which is a saturated FFA, in the presence or absence of toyocamycin. In addition, male C57BL/6J mice were fed a diet rich in saturated fat, fructose, and cholesterol (FFC) for 4 months, after which the effect of toyocamycin was assessed. Results Toyocamycin attenuated FFA-induced steatosis. It also significantly reduced PA-induced hepatocyte lipoapoptosis. In addition, toyocamycin reduced the expression of cytosine-cytosine-adenosine-adenosine-thymidine enhancer-binding protein homologous protein (CHOP), which is a key player in ER stress-mediated apoptosis, as well as its downstream cell death modulator, death receptor 5. In the in vivo study, toyocamycin ameliorated the liver injury caused by FFC-induced NAFLD. It also reduced hepatic steatosis and the expression of lipogenic genes. Conclusions The data we obtained suggest that toyocamycin attenuates hepatocyte lipogenesis and ameliorates NAFLD in vivo and may therefore be beneficial in the treatment of NAFLD in humans.
Collapse
Affiliation(s)
- Ikuko Takahara
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Yuko Akazawa
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
- * E-mail:
| | - Maiko Tabuchi
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Katsuya Matsuda
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Hisamitsu Miyaaki
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Youko Kido
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Yasuko Kanda
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Naota Taura
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Ken Ohnita
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Fuminao Takeshima
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| | - Yusuke Sakai
- Department of Surgery, Nagasaki University, Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Susumu Eguchi
- Department of Surgery, Nagasaki University, Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Masahiro Nakashima
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Kazuhiko Nakao
- Division of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki, Japan
| |
Collapse
|
28
|
Nikonorova IA, Al-Baghdadi RJT, Mirek ET, Wang Y, Goudie MP, Wetstein BB, Dixon JL, Hine C, Mitchell JR, Adams CM, Wek RC, Anthony TG. Obesity challenges the hepatoprotective function of the integrated stress response to asparaginase exposure in mice. J Biol Chem 2017; 292:6786-6798. [PMID: 28242759 DOI: 10.1074/jbc.m116.768408] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 02/17/2017] [Indexed: 01/12/2023] Open
Abstract
Obesity increases risk for liver toxicity by the anti-leukemic agent asparaginase, but the mechanism is unknown. Asparaginase activates the integrated stress response (ISR) via sensing amino acid depletion by the eukaryotic initiation factor 2 (eIF2) kinase GCN2. The goal of this work was to discern the impact of obesity, alone versus alongside genetic disruption of the ISR, on mechanisms of liver protection during chronic asparaginase exposure in mice. Following diet-induced obesity, biochemical analysis of livers revealed that asparaginase provoked hepatic steatosis that coincided with activation of another eIF2 kinase PKR-like endoplasmic reticulum kinase (PERK), a major ISR transducer to ER stress. Genetic loss of Gcn2 intensified hepatic PERK activation to asparaginase, yet surprisingly, mRNA levels of key ISR gene targets such as Atf5 and Trib3 failed to increase. Instead, mechanistic target of rapamycin complex 1 (mTORC1) signal transduction was unleashed, and this coincided with liver dysfunction reflected by a failure to maintain hydrogen sulfide production or apolipoprotein B100 (ApoB100) expression. In contrast, obese mice lacking hepatic activating transcription factor 4 (Atf4) showed an exaggerated ISR and greater loss of endogenous hydrogen sulfide but normal inhibition of mTORC1 and maintenance of ApoB100 during asparaginase exposure. In both genetic mouse models, expression and phosphorylation of Sestrin2, an ATF4 gene target, was increased by asparaginase, suggesting mTORC1 inhibition during asparaginase exposure is not driven via eIF2-ATF4-Sestrin2. In conclusion, obesity promotes a maladaptive ISR during asparaginase exposure. GCN2 functions to repress mTORC1 activity and maintain ApoB100 protein levels independently of Atf4 expression, whereas hydrogen sulfide production is promoted via GCN2-ATF4 pathway.
Collapse
Affiliation(s)
| | - Rana J T Al-Baghdadi
- the Endocrinology and Animal Biosciences Graduate Program, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901
| | | | | | | | | | - Joseph L Dixon
- From the Department of Nutritional Sciences, and.,the Rutgers Center for Lipid Research, New Jersey Institute for Food, Nutrition and Health, New Brunswick, New Jersey 08901
| | - Christopher Hine
- the Department of Genetics and Complex Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115
| | - James R Mitchell
- the Department of Genetics and Complex Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115
| | - Christopher M Adams
- the Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242, and
| | - Ronald C Wek
- the Department of Biochemistry and Molecular Biology, Indiana University, School of Medicine, Indianapolis, Indiana 46202
| | - Tracy G Anthony
- From the Department of Nutritional Sciences, and .,the Endocrinology and Animal Biosciences Graduate Program, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901.,the Rutgers Center for Lipid Research, New Jersey Institute for Food, Nutrition and Health, New Brunswick, New Jersey 08901
| |
Collapse
|
29
|
Sarvani C, Sireesh D, Ramkumar KM. Unraveling the role of ER stress inhibitors in the context of metabolic diseases. Pharmacol Res 2017; 119:412-421. [PMID: 28237513 DOI: 10.1016/j.phrs.2017.02.018] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 02/16/2017] [Accepted: 02/20/2017] [Indexed: 02/05/2023]
Abstract
ER stress is provoked by the accumulation of unfolded and misfolded proteins in the ER lumen leading to perturbations in ER homeostasis. ER stress activates a signaling cascade called the Unfolded Protein Response (UPR) which triggers a set of transcriptional and translational events that restore ER homeostasis, promoting cell survival and adaptation. If this adaptive response fails, a terminal UPR program commits such cells to apoptosis. Existing preclinical and clinical evidence testify that prolonged ER stress escalates the risk of several metabolic disorders including diabetes, obesity and dyslipidemia. There have been considerable efforts to develop small molecules that are capable of ameliorating ER stress. Few naturally occurring and synthetic molecules have already been demonstrated for their efficacy in abrogating ER stress in both in vitro and in vivo models of metabolic disorders. This review provides a broad overview of the molecular mechanisms of inhibition of ER stress and its association with various metabolic diseases.
Collapse
Affiliation(s)
- Chodisetty Sarvani
- SRM Research Institute, SRM University, Kattankulathur 603 203, Tamilnadu, India
| | - Dornadula Sireesh
- SRM Research Institute, SRM University, Kattankulathur 603 203, Tamilnadu, India
| | | |
Collapse
|
30
|
4-PBA reverses autophagic dysfunction and improves insulin sensitivity in adipose tissue of obese mice via Akt/mTOR signaling. Biochem Biophys Res Commun 2017; 484:529-535. [PMID: 28153729 DOI: 10.1016/j.bbrc.2017.01.106] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Accepted: 01/21/2017] [Indexed: 12/31/2022]
Abstract
BACKGROUND 4-phenyl butyric acid (4-PBA) has been considered as a key regulator of insulin resistance in obesity. However the mechanism of 4-PBA involved in insulin resistance remains elusive. METHODS We evaluated the effect of 4-PBA on abnormal autophagy and endoplasmic reticulum (ER) stress in obese mice. 4-PBA was administered in obese mice and adipocyte models, and metabolic parameters, autophagy markers, ER stress indicators, Akt/mTOR signaling and insulin signaling molecular were assessed. RESULTS 4-PBA treatment not only reversed autophagic dysfunction and ER stress, but also improved impaired insulin signaling in tunicamycin-induced adipocytes, and 4-PBA also inhibited activated ER stress and elevated insulin sensitivity in adipocytes with Atg7 siRNA. Additionally, administration of 4-PBA improves glucose tolerance and insulin sensitivity in obese mice via regulating abnormal autophagy and ER stress in adipose tissue. The protective effects of 4-PBA were nullified by suppression of Akt and mTOR in adipocytes, suggesting that 4-PBA inhibits autophagy and restores insulin sensitivity via Akt/mTOR signaling partially. CONCLUSIONS 4-PBA reverses autophagic dysfunction and improves insulin sensitivity in adipose tissue of obese mice via Akt/mTOR signaling partly, which could be regarded as novel opportunities for treatment of insulin resistance.
Collapse
|
31
|
Rieusset J. Endoplasmic reticulum-mitochondria calcium signaling in hepatic metabolic diseases. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:865-876. [PMID: 28064001 DOI: 10.1016/j.bbamcr.2017.01.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 12/21/2016] [Accepted: 01/02/2017] [Indexed: 02/07/2023]
Abstract
The liver plays a central role in glucose homeostasis, and both metabolic inflexibility and insulin resistance predispose to the development of hepatic metabolic diseases. Mitochondria and endoplasmic reticulum (ER), which play a key role in the control of hepatic metabolism, also interact at contact points defined as mitochondria-associated membranes (MAM), in order to exchange metabolites and calcium (Ca2+) and regulate cellular homeostasis and signaling. Here, we overview the role of the liver in the control of glucose homeostasis, mainly focusing on the independent involvement of mitochondria, ER and Ca2+ signaling in both healthy and pathological contexts. Then we focus on recent data highlighting MAM as important hubs for hormone and nutrient signaling in the liver, thus adapting mitochondria physiology and cellular metabolism to energy availability. Lastly, we discuss how chronic ER-mitochondria miscommunication could participate to hepatic metabolic diseases, pointing MAM interface as a potential therapeutic target for metabolic disorders. This article is part of a Special Issue entitled: ECS Meeting edited by Claus Heizmann, Joachim Krebs and Jacques Haiech.
Collapse
Affiliation(s)
- Jennifer Rieusset
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1397, F-69921 Oullins, France.
| |
Collapse
|
32
|
Hepatic BSCL2 (Seipin) Deficiency Disrupts Lipid Droplet Homeostasis and Increases Lipid Metabolism via SCD1 Activity. Lipids 2016; 52:129-150. [DOI: 10.1007/s11745-016-4210-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 10/25/2016] [Indexed: 12/11/2022]
|
33
|
Akazawa Y, Nakao K. Lipotoxicity pathways intersect in hepatocytes: Endoplasmic reticulum stress, c-Jun N-terminal kinase-1, and death receptors. Hepatol Res 2016; 46:977-84. [PMID: 26938481 DOI: 10.1111/hepr.12658] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 01/22/2016] [Indexed: 12/16/2022]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is becoming increasingly more common worldwide. Hepatocyte apoptosis caused by free fatty acids, termed hepatocyte lipoapoptosis, is a feature of non-alcoholic steatohepatitis (NASH), an advanced form of NAFLD. As no salutary treatment for NASH exists, it is important to understand the molecular mechanisms responsible for disease development and progression. This review discusses recent developments in research on hepatocyte lipoapoptosis, focusing on the endoplasmic reticulum stress, c-Jun N-terminal kinase-1, and death receptor-mediated pathway networks and their modulators and interactions. In addition, we describe the emerging importance of the signaling pathways that not only impact the dying hepatocytes themselves, but also influence surrounding cells and possibly promote disease progression through the release of microvesicles. Overall, a more comprehensive understanding of the molecular mediators in lipotoxicity-related pathways would likely benefit the development of mechanism-based therapies of NASH.
Collapse
Affiliation(s)
- Yuko Akazawa
- Department of Gastroenterology and Hepatology, Nagasaki University Hospital, Nagasaki City, Japan
| | - Kazuhiko Nakao
- Department of Gastroenterology and Hepatology, Nagasaki University Hospital, Nagasaki City, Japan
| |
Collapse
|
34
|
Lian J, Wei E, Groenendyk J, Das SK, Hermansson M, Li L, Watts R, Thiesen A, Oudit GY, Michalak M, Lehner R. Ces3/TGH Deficiency Attenuates Steatohepatitis. Sci Rep 2016; 6:25747. [PMID: 27181051 PMCID: PMC4867576 DOI: 10.1038/srep25747] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 04/22/2016] [Indexed: 02/06/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the most common form of chronic liver disease in developed countries. NAFLD describes a wide range of liver pathologies from simple steatosis to nonalcoholic steatohepatitis (NASH) and cirrhosis. NASH is distinguished from simple steatosis by inflammation, cell death and fibrosis. In this study we found that mice lacking triacylglycerol hydrolase (TGH, also known as carboxylesterase 3 or carboxylesterase 1d) are protected from high-fat diet (HFD) - induced hepatic steatosis via decreased lipogenesis, increased fatty acid oxidation and improved hepatic insulin sensitivity. To examine the effect of the loss of TGH function on the more severe NAFLD form NASH, we ablated Tgh expression in two independent NASH mouse models, Pemt(-/-) mice fed HFD and Ldlr(-/-) mice fed high-fat, high-cholesterol Western-type diet (WTD). TGH deficiency reduced liver inflammation, oxidative stress and fibrosis in Pemt(-/-) mice. TGH deficiency also decreased NASH in Ldlr(-/-) mice. Collectively, these findings indicate that TGH deficiency attenuated both simple hepatic steatosis and irreversible NASH.
Collapse
Affiliation(s)
- Jihong Lian
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Enhui Wei
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Jody Groenendyk
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Subhash K. Das
- Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Martin Hermansson
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Lena Li
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Russell Watts
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Aducio Thiesen
- Department of Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Gavin Y. Oudit
- Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Marek Michalak
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Richard Lehner
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Edmonton, Alberta, Canada
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Department of Cell Biology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| |
Collapse
|
35
|
CXC chemokine receptor 3 promotes steatohepatitis in mice through mediating inflammatory cytokines, macrophages and autophagy. J Hepatol 2016; 64:160-70. [PMID: 26394162 DOI: 10.1016/j.jhep.2015.09.005] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 07/17/2015] [Accepted: 09/01/2015] [Indexed: 12/22/2022]
Abstract
BACKGROUND & AIMS CXC chemokine receptor 3 (CXCR3) is involved in virus-related chronic liver inflammation. However, the role of CXCR3 in non-alcoholic steatohepatitis (NASH) remains unclear. We aimed to investigate the role of CXCR3 in NASH. METHODS Human liver tissues were obtained from 24 non-alcoholic fatty liver disease (NAFLD) patients and 20 control subjects. CXCR3 knockout (CXCR3(-/-)), obese db/db mice and their wild-type (WT) littermates were used in both methionine-and-choline-deficient (MCD) diet and high-fat high-carbohydrate high-cholesterol (HFHC) diet-induced NASH models. In addition, MCD-fed WT mice were administrated with CXCR3 specific antagonists. RESULTS CXCR3 was significantly upregulated in liver tissues of patients with NAFLD and in dietary-induced NASH animal models. Compared with WT littermates, CXCR3(-/-) mice were more resistant to both MCD and HFHC diet-induced steatohepatitis. Induction of CXCR3 in dietary-induced steatohepatitis was associated with the increased expression of hepatic pro-inflammatory cytokines, activation of NF-κB, macrophage infiltration and T lymphocytes accumulation (Th1 and Th17 immune response). CXCR3 was also linked to steatosis through inducing hepatic lipogenic genes. Moreover, CXCR3 is associated with autophagosome-lysosome impairment and endoplasmic reticulum (ER) stress in steatohepatitis as evidenced by LC3-II and p62/SQSTM1 accumulation and the induction of GRP78, phospho-PERK and phospho-eIF2α. Inhibition of CXCR3 using CXCR3 antagonist significantly suppressed MCD-induced steatosis and hepatocytes injury in AML-12 hepatocytes. Blockade of CXCR3 using CXCR3 antagonists in mice reversed the established steatohepatitis. CONCLUSIONS CXCR3 plays a pivotal role in NASH development by inducing production of cytokines, macrophage infiltration, fatty acid synthesis and causing autophagy deficiency and ER stress.
Collapse
|
36
|
Recent insights on the role of cholesterol in non-alcoholic fatty liver disease. Biochim Biophys Acta Mol Basis Dis 2015; 1852:1765-78. [DOI: 10.1016/j.bbadis.2015.05.015] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/25/2015] [Accepted: 05/27/2015] [Indexed: 12/18/2022]
|
37
|
Hsu HC, Liu CH, Tsai YC, Li SJ, Chen CY, Chu CH, Chen MF. Time-dependent cellular response in the liver and heart in a dietary-induced obese mouse model: the potential role of ER stress and autophagy. Eur J Nutr 2015; 55:2031-43. [PMID: 26264388 DOI: 10.1007/s00394-015-1017-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 08/05/2015] [Indexed: 12/31/2022]
Abstract
PURPOSE Both endoplasmic reticulum stress (ER stress) and autophagy are essential for the response of the protein quality control system to cellular stresses. This study investigated the influence of the duration of a high-fat diet (HFD) in mice on tissue-specific cellular responses, specifically with regard to the role of autophagy and ER stress. METHODS Male mice aged 6-7 weeks were fed ad libitum with a standard chow diet or with a HFD for 2, 4, 8, or 16 weeks. RESULTS The HFD progressively increased mean body weight and induced tissue hypertrophy. The expression of PERK was suppressed in the liver after 16 weeks of the HFD and in the heart after 8 weeks of the HFD. Procaspase 12 and its activated form were induced in the liver with the HFD after 2 weeks, but not in the heart over the 16-week period. The activation of hepatic AMPK was elevated following 4 weeks of the HFD, but was inhibited after 16 weeks of the HFD. The ratio of LC3II to LC3I in the liver did not increase except in those mice fed the HFD for 16 weeks. The expression of AMPK and LC3 in the heart did not change over the entire 16 weeks of feeding the HFD. Cleaved PARP was increased in the liver and heart of mice receiving the HFD for 8 weeks. CONCLUSIONS This study provides evidence that a HFD affects the cellular protein quality control processes responsible for metabolic disorder in a tissue- and duration-dependent manner.
Collapse
Affiliation(s)
- Hsiu-Ching Hsu
- Department of Internal Medicine, National Taiwan University Hospital, 7 Chung-Shan S Rd, Taipei, Taiwan
| | - Chia-Hsin Liu
- Department of Animal Science and Technology, National Taiwan University, 50, Lane 155, Sec 3, Keelung Rd, Taipei, 10672, Taiwan
| | - Yi-Chen Tsai
- Department of Animal Science and Technology, National Taiwan University, 50, Lane 155, Sec 3, Keelung Rd, Taipei, 10672, Taiwan
| | - Sin-Jin Li
- Department of Animal Science and Technology, National Taiwan University, 50, Lane 155, Sec 3, Keelung Rd, Taipei, 10672, Taiwan
| | - Ching-Yi Chen
- Department of Animal Science and Technology, National Taiwan University, No. 50, Lane 155, Sec 3, Keelung Rd, Taipei, 10672, Taiwan.
| | - Chun-Han Chu
- Department of Animal Science and Technology, National Taiwan University, 50, Lane 155, Sec 3, Keelung Rd, Taipei, 10672, Taiwan
| | - Ming-Fong Chen
- Department of Internal Medicine, National Taiwan University Hospital, 7 Chung-Shan S Rd, Taipei, Taiwan
| |
Collapse
|
38
|
Zhang XQ, Pan Y, Yu CH, Xu CF, Xu L, Li YM, Chen WX. PDIA3 Knockdown Exacerbates Free Fatty Acid-Induced Hepatocyte Steatosis and Apoptosis. PLoS One 2015. [PMID: 26214517 PMCID: PMC4516249 DOI: 10.1371/journal.pone.0133882] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) has emerged as one of the most common chronic liver disease over the past decades. Endoplasmic reticulum stress (ERS) plays a pivotal role during the development of NAFLD. This study aims to analyze the potential role of protein disulfide isomerase A3 precursor (PDIA3), one of the ER chaperones, in free fatty acid-induced cell model of NAFLD. Human liver L02 cell line was treated with sodium palmitate for 24 hours, which developed severe intracellular lipid accumulation. The increased protein level of PDIA3 was detected via immunoblotting analysis in the fat loaded cell models of NAFLD. siRNA-mediated knockdown of PDIA3 in L02 cells not only increased the cellular lipid accumulation, but also exacerbated hepatocytes apoptosis induced by sodium palmitate. Further investigation revealed that knockdown of PDIA3 up-regulated protein expression of fatty acid synthase (FAS), a key enzyme involved in fatty acid synthesis. PDIA3 knockdown also up-regulated key molecules of ERS pathway, including glucose-regulated protein 78 (GRP78), phospho-PKR-like ER kinase (p-PERK), and C/EBP homologous protein (CHOP). Our results suggested that ER chaperone PDIA3 plays a pivotal role in FFA-induced hepatocyte steatosis and apoptosis.
Collapse
Affiliation(s)
- Xue-qun Zhang
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
| | - Yue Pan
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
| | - Chao-hui Yu
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
| | - Cheng-fu Xu
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
| | - Lei Xu
- Department of Gastroenterology, Ningbo No.1 Hospital, Ningbo, Zhejiang Province, China
| | - You-ming Li
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
| | - Wei-xing Chen
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hang Zhou, Zhejiang Province, China
- * E-mail:
| |
Collapse
|
39
|
Pilar Valdecantos M, Prieto-Hontoria PL, Pardo V, Módol T, Santamaría B, Weber M, Herrero L, Serra D, Muntané J, Cuadrado A, Moreno-Aliaga MJ, Alfredo Martínez J, Valverde ÁM. Essential role of Nrf2 in the protective effect of lipoic acid against lipoapoptosis in hepatocytes. Free Radic Biol Med 2015; 84:263-278. [PMID: 25841776 DOI: 10.1016/j.freeradbiomed.2015.03.019] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 02/10/2015] [Accepted: 03/01/2015] [Indexed: 01/06/2023]
Abstract
Excess of saturated free fatty acids, such as palmitic acid (PA), in hepatocytes has been implicated in nonalcoholic fatty liver disease. α-Lipoic acid (LA) is an antioxidant that protects against oxidative stress conditions. We have investigated the effects of LA in the early activation of oxidative and endoplasmic reticulum stress, lipid accumulation, and Nrf2-mediated antioxidant defenses in hepatocytes treated with PA or in rats fed a high-fat diet. In primary human hepatocytes, a lipotoxic concentration of PA triggered endoplasmic reticulum stress, induced the apoptotic transcription factor CHOP, and increased the percentage of apoptotic cells. Cotreatment with LA prevented these effects. Similar results were found in mouse hepatocytes in which LA attenuated PA-mediated activation of caspase 3 and reduced lipid accumulation by decreasing PA uptake and increasing fatty acid oxidation and lipophagy, thereby preventing lipoapoptosis. Moreover, LA augmented the proliferation capacity of hepatocytes after PA challenge. Antioxidant effects of LA ameliorated reactive oxygen species production and endoplasmic reticulum stress and protected against mitochondrial apoptosis in hepatocytes treated with PA. Cotreatment with PA and LA induced an early nuclear translocation of Nrf2 and activated antioxidant enzymes, whereas reduction of Nrf2 by siRNA abolished the benefit of LA on PA-induced lipoapoptosis. Importantly, posttreatment with LA reversed the established damage induced by PA in hepatocytes, as well as preventing obesity-induced oxidative stress and lipoapoptosis in rat liver. In conclusion, our work has revealed that in hepatocytes, Nrf2 is an essential early player in the rescue of oxidative stress by LA leading to protection against PA-mediated lipoapoptosis.
Collapse
Affiliation(s)
- M Pilar Valdecantos
- Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain; Instituto de Investigación Sanitaria La Paz, 28029 Madrid, Spain
| | | | - Virginia Pardo
- Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Teresa Módol
- Department of Biochemistry and Genetics, University of Navarra, 31008 Pamplona, Spain
| | - Beatriz Santamaría
- Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain; Instituto de Investigación Sanitaria La Paz, 28029 Madrid, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Minéia Weber
- Department of Biochemistry and Molecular Biology, Institut de Biomedicina, Universitat de Barcelona, E-08028 Barcelona, Spain; Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Laura Herrero
- Department of Biochemistry and Molecular Biology, Institut de Biomedicina, Universitat de Barcelona, E-08028 Barcelona, Spain; Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Dolors Serra
- Department of Biochemistry and Molecular Biology, Institut de Biomedicina, Universitat de Barcelona, E-08028 Barcelona, Spain; Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Jordi Muntané
- Departamento de Cirugía General y Digestiva, Hospital Universitario Virgen del Rocío-Virgen Macarena/IBiS/CSIC/University of Sevilla, 41013 Sevilla, Spain; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Antonio Cuadrado
- Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain; Instituto de Investigación Sanitaria La Paz, 28029 Madrid, Spain; Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - María Jesús Moreno-Aliaga
- Department of Nutrition, Food Science, and Physiology University of Navarra, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - J Alfredo Martínez
- Department of Nutrition, Food Science, and Physiology University of Navarra, 31008 Pamplona, Spain; Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Ángela M Valverde
- Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain; Instituto de Investigación Sanitaria La Paz, 28029 Madrid, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, 28029 Madrid, Spain.
| |
Collapse
|
40
|
Khoury T, Ben Ya'acov A, Shabat Y, Zolotarovya L, Snir R, Ilan Y. Altered distribution of regulatory lymphocytes by oral administration of soy-extracts exerts a hepatoprotective effect alleviating immune mediated liver injury, non-alcoholic steatohepatitis and insulin resistance. World J Gastroenterol 2015; 21:7443-56. [PMID: 26139990 PMCID: PMC4481439 DOI: 10.3748/wjg.v21.i24.7443] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 02/08/2015] [Accepted: 03/30/2015] [Indexed: 02/06/2023] Open
Abstract
AIM To determine the immune-modulatory and the hepatoprotective effects of oral administration of two soy extracts in immune mediated liver injury and non-alcoholic steatohepatitis (NASH). METHODS Two soy extracts, M1 and OS, were orally administered to mice with concanavalin A (ConA) immune-mediated hepatitis, to high-fat diet (HFD) mice and to methionine and choline reduced diet combined with HFD mice. Animals were followed for disease and immune biomarkers. RESULTS Oral administration of OS and M1 had an additive effect in alleviating ConA hepatitis manifested by a decrease in alanine aminotransferase and aspartate aminotransferase serum levels. Oral administration of the OS and M1 soy derived fractions, ameliorated liver injury in the high fat diet model of NASH, manifested by a decrease in hepatic triglyceride levels, improvement in liver histology, decreased serum cholesterol and triglycerides and improved insulin resistance. In the methionine and choline reduced diet combined with the high fat diet model, we noted a decrease in hepatic triglycerides and improvement in blood glucose levels and liver histology. The effects were associated with reduced serum tumor necrosis factor alpha and alteration of regulatory T cell distribution. CONCLUSION Oral administration of the combination of OS and M1 soy derived extracts exerted an adjuvant effect in the gut-immune system, altering the distribution of regulatory T cells, and alleviating immune mediated liver injury, hyperlipidemia and insulin resistance.
Collapse
|
41
|
Noureddin M, Rinella ME. Nonalcoholic Fatty liver disease, diabetes, obesity, and hepatocellular carcinoma. Clin Liver Dis 2015; 19:361-79. [PMID: 25921668 PMCID: PMC6658171 DOI: 10.1016/j.cld.2015.01.012] [Citation(s) in RCA: 129] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Diabetes and obesity are associated with nonalcoholic fatty liver disease (NAFLD) and an increased incidence of hepatocellular carcinoma (HCC). NAFLD is the commonest cause of chronic liver disease. HCC can develop in NAFLD patients even without cirrhosis, suggesting an association between the metabolic process and HCC and raising a concern that many cancers could be missed given high NAFLD prevalence and screening limitations. The increasing prevalence of these conditions and lack of effective treatments necessitate a better understanding of their connection. This article defines the known interrelationships and common pathways between NAFLD, diabetes, obesity and HCC and possible chemoprevention strategies.
Collapse
Affiliation(s)
- Mazen Noureddin
- Division of Gastrointestinal and Liver Diseases, USC Keck School of Medicine, 2011 Zonal Avenue, HMR 101, Los Angeles, CA 90033, USA
| | - Mary E. Rinella
- Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, 676 North Saint Clair, Arkes Pavillion 14-005, Chicago, IL 60611, USA,Corresponding author.
| |
Collapse
|
42
|
Zhang Q, Li Y, Liang T, Lu X, Zhang C, Liu X, Jiang X, Martin RC, Cheng M, Cai L. ER stress and autophagy dysfunction contribute to fatty liver in diabetic mice. Int J Biol Sci 2015; 11:559-68. [PMID: 25892963 PMCID: PMC4400387 DOI: 10.7150/ijbs.10690] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 01/15/2015] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus and nonalcoholic fatty liver disease (NAFLD) are often identified in patients simultaneously. Recent evidence suggests that endoplasmic reticulum (ER) stress and autophagy dysfunction play an important role in hepatocytes injury and hepatic lipid metabolism, however the mechanistic interaction between diabetes and NAFLD is largely unknown. In this study, we used a diabetic mouse model to study the interplay between ER stress and autophagy during the pathogenic transformation of NAFLD. The coexist of inflammatory hepatic injury and hepatic accumulation of triglycerides (TGs) stored in lipid droplets indicated development of steatohepatitis in the diabetic mice. The alterations of components for ER stress signaling including ATF6, GRP78, CHOP and caspase12 indicated increased ER stress in liver tissues in early stage but blunted in the later stage during the development of diabetes. Likewise, autophagy functioned well in the early stage but suppressed in the later stage. The inactivation of unfolded protein response and suppression of autophagy were positively related to the development of steatohepatitis, which linked to metabolic abnormalities in the compromised hepatic tissues in diabetic condition. We conclude that the adaption of ER stress and impairment of autophagy play an important role to exacerbate lipid metabolic disorder contributing to steatohepatitis in diabetes.
Collapse
Affiliation(s)
- Quan Zhang
- 1. Department of Infectious Diseases, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou, China, 550004 ; 4. Kosair Children's Hospital Research Institute, the Department of Pediatrics of the University of Louisville, Louisville, KY 40202, USA
| | - Yan Li
- 2. Department of Surgery, School of Medicine, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Tingting Liang
- 1. Department of Infectious Diseases, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou, China, 550004 ; 4. Kosair Children's Hospital Research Institute, the Department of Pediatrics of the University of Louisville, Louisville, KY 40202, USA
| | - Xuemian Lu
- 3. Chinese-American Research Institute for Diabetic Complications RuiAn Center, the Department of Endocrinology, The Third Affiliated Hospital of Wenzhou Medical University, Ruian, Zhejiang, China, 325200
| | - Chi Zhang
- 3. Chinese-American Research Institute for Diabetic Complications RuiAn Center, the Department of Endocrinology, The Third Affiliated Hospital of Wenzhou Medical University, Ruian, Zhejiang, China, 325200
| | - Xingkai Liu
- 4. Kosair Children's Hospital Research Institute, the Department of Pediatrics of the University of Louisville, Louisville, KY 40202, USA ; 5. The First Hospital of Jilin University, Changchun, China 130021
| | - Xin Jiang
- 5. The First Hospital of Jilin University, Changchun, China 130021
| | - Robert C Martin
- 2. Department of Surgery, School of Medicine, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Mingliang Cheng
- 1. Department of Infectious Diseases, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou, China, 550004
| | - Lu Cai
- 3. Chinese-American Research Institute for Diabetic Complications RuiAn Center, the Department of Endocrinology, The Third Affiliated Hospital of Wenzhou Medical University, Ruian, Zhejiang, China, 325200 ; 4. Kosair Children's Hospital Research Institute, the Department of Pediatrics of the University of Louisville, Louisville, KY 40202, USA
| |
Collapse
|
43
|
Inaba Y, Furutani T, Kimura K, Watanabe H, Haga S, Kido Y, Matsumoto M, Yamamoto Y, Harada K, Kaneko S, Oyadomari S, Ozaki M, Kasuga M, Inoue H. Growth arrest and DNA damage-inducible 34 regulates liver regeneration in hepatic steatosis in mice. Hepatology 2015; 61:1343-56. [PMID: 25420998 DOI: 10.1002/hep.27619] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 11/19/2014] [Indexed: 12/24/2022]
Abstract
UNLABELLED The liver has robust regenerative potential in response to damage, but hepatic steatosis (HS) weakens this potential. We found that the enhanced integrated stress response (ISR) mediated by phosphorylation of the alpha subunit of eukaryotic initiation factor 2 (eIF2α) impairs regeneration in HS and that growth arrest and DNA damage-inducible 34 (Gadd34)-dependent suppression of ISR plays a crucial role in fatty liver regeneration. Although mice fed a high-fat diet for 2 weeks developed moderate fatty liver with no increase in eIF2α phosphorylation before 70% hepatectomy, they showed impaired liver regeneration as a result of reduced proliferation and increased death of hepatocytes with increased phosphorylation of eIF2α and ISR. An increased ISR through Gadd34 knockdown induced C/EBP homologous protein (CHOP)-dependent apoptosis and receptor-interacting protein kinase 3-dependent necrosis, resulting in increased hepatocyte death during fatty liver regeneration. Furthermore, Gadd34 knockdown and increased phosphorylation of eIF2α decreased cyclin D1 protein and reduced hepatocyte proliferation. In contrast, enhancement of Gadd34 suppressed phosphorylation of eIF2α and reduced CHOP expression and hepatocyte apoptosis without affecting hepatocyte proliferation, clearly improving fatty liver regeneration. In more severe fatty liver of leptin receptor-deficient db/db mice, forced expression of hepatic Gadd34 also promoted hepatic regeneration after hepatectomy. CONCLUSION Gadd34-mediated regulation of ISR acts as a physiological defense mechanism against impaired liver regeneration resulting from steatosis and is thus a possible therapeutic target for impaired regeneration in HS.
Collapse
Affiliation(s)
- Yuka Inaba
- Department of Physiology and Metabolism, Brain/Liver Interface Medicine Research Center, Kanazawa University, Kanazawa, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Guo Q, Shi Q, Li H, Liu J, Wu S, Sun H, Zhou B. Glycolipid Metabolism Disorder in the Liver of Obese Mice Is Improved by TUDCA via the Restoration of Defective Hepatic Autophagy. Int J Endocrinol 2015; 2015:687938. [PMID: 26681941 PMCID: PMC4668323 DOI: 10.1155/2015/687938] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 10/24/2015] [Accepted: 11/01/2015] [Indexed: 12/16/2022] Open
Abstract
Objective. Tauroursodeoxycholic acid (TUDCA) has been considered an important regulator of energy metabolism in obesity. However, the mechanism underlying how TUDCA is involved in insulin resistance is not fully understood. We tested the effects of TUDCA on autophagic dysfunction in obese mice. Material and Methods. 500 mg/kg of TUDCA was injected into obese mice, and metabolic parameters, autophagy markers, and insulin signaling molecular were assessed by Western blotting and real-time PCR. Results. The TUDCA injections in the obese mice resulted in a reduced body weight gain, lower blood glucose, and improved insulin sensitivity compared with obese mice that were injected with vehicle. Meanwhile, TUDCA treatment not only reversed autophagic dysfunction and endoplasmic reticulum stress, but also improved the impaired insulin signaling in the liver of obese mice. Additionally, the same results obtained with TUDCA were evident in obese mice treated with the adenoviral Atg7. Conclusions. We found that TUDCA reversed abnormal autophagy, reduced ER stress, and restored insulin sensitivity in the liver of obese mice and that glycolipid metabolism disorder was also improved via the restoration of defective hepatic autophagy.
Collapse
Affiliation(s)
- Qinyue Guo
- Critical Care Medicine, The First Affiliated Hospital of Medical School of Xi'an Jiaotong University, 277 Yanta West Street, Xi'an, Shaanxi 710061, China
| | - Qindong Shi
- Critical Care Medicine, The First Affiliated Hospital of Medical School of Xi'an Jiaotong University, 277 Yanta West Street, Xi'an, Shaanxi 710061, China
| | - Huixia Li
- Key Laboratory of Environment and Genes Related to Diseases, Medical School of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Jiali Liu
- Key Laboratory of Environment and Genes Related to Diseases, Medical School of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Shufang Wu
- Center for Translational Medicine, The First Affiliated Hospital of Medical School of Xi'an Jiaotong University, 277 Yanta West Street, Xi'an, Shaanxi 710061, China
| | - Hongzhi Sun
- Key Laboratory of Environment and Genes Related to Diseases, Medical School of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
- *Hongzhi Sun: and
| | - Bo Zhou
- Department of Respiratory, The First Affiliated Hospital of Medical School of Xi'an Jiaotong University, 277 Yanta West Street, Xi'an, Shaanxi 710061, China
- *Bo Zhou:
| |
Collapse
|
45
|
Endoplasmic reticulum stress does not contribute to steatohepatitis in obese and insulin-resistant high-fat-diet-fed foz/foz mice. Clin Sci (Lond) 2014; 127:507-18. [DOI: 10.1042/cs20140026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Unlike in mice developing simple steatosis, endoplasmic reticulum stress does not contribute to the pathogenesis of insulin resistance and steatohepatitis in high-fat-diet-fed foz/foz mice, which develop progressive liver disease in the metabolic context seen in human non-alcoholic steatohepatitis.
Collapse
|
46
|
Activating transcription factor 6 is necessary and sufficient for alcoholic fatty liver disease in zebrafish. PLoS Genet 2014; 10:e1004335. [PMID: 24874946 PMCID: PMC4038464 DOI: 10.1371/journal.pgen.1004335] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 03/07/2014] [Indexed: 01/07/2023] Open
Abstract
Fatty liver disease (FLD) is characterized by lipid accumulation in hepatocytes and is accompanied by secretory pathway dysfunction, resulting in induction of the unfolded protein response (UPR). Activating transcription factor 6 (ATF6), one of three main UPR sensors, functions to both promote FLD during acute stress and reduce FLD during chronic stress. There is little mechanistic understanding of how ATF6, or any other UPR factor, regulates hepatic lipid metabolism to cause disease. We addressed this using zebrafish genetics and biochemical analyses and demonstrate that Atf6 is necessary and sufficient for FLD. atf6 transcription is significantly upregulated in the liver of zebrafish with alcoholic FLD and morpholino-mediated atf6 depletion significantly reduced steatosis incidence caused by alcohol. Moreover, overexpression of active, nuclear Atf6 (nAtf6) in hepatocytes caused FLD in the absence of stress. mRNA-Seq and qPCR analyses of livers from five day old nAtf6 transgenic larvae revealed upregulation of genes promoting glyceroneogenesis and fatty acid elongation, including fatty acid synthase (fasn), and nAtf6 overexpression in both zebrafish larvae and human hepatoma cells increased the incorporation of 14C-acetate into lipids. Srebp transcription factors are key regulators of lipogenic enzymes, but reducing Srebp activation by scap morpholino injection neither prevented FLD in nAtf6 transgenics nor synergized with atf6 knockdown to reduce alcohol-induced FLD. In contrast, fasn morpholino injection reduced FLD in nAtf6 transgenic larvae and synergistically interacted with atf6 to reduce alcoholic FLD. Thus, our data demonstrate that Atf6 is required for alcoholic FLD and epistatically interacts with fasn to cause this disease, suggesting triglyceride biogenesis as the mechanism of UPR induced FLD. Fatty liver disease (steatosis) is the most common liver disease worldwide and is commonly caused by obesity, type 2 diabetes, or alcohol abuse. All of these conditions are associated with impaired hepatocyte protein secretion, resulting in hypoproteinemia that contributes to the systemic complications of these diseases. The unfolded protein response (UPR) is activated in response to stress in the protein secretory pathway and a wealth of data indicates that UPR activation can contribute to steatosis, but the mechanistic basis for this relationship is poorly understood. We identify activating transcription factor 6 (Atf6), one of three UPR sensors, as necessary and sufficient for steatosis and show that Atf6 activation can promote lipogenesis, providing a direct connection between the stress response and lipid metabolism. Blocking Atf6 in zebrafish larvae prevents alcohol-induced steatosis and Atf6 overexpression in zebrafish hepatocytes induces genes that drive lipogenesis, increases lipid production and causes steatosis. Fatty acid synthase (fasn) is a key lipogenic enzyme and we show that fasn is required for fatty liver in response to both ethanol and Atf6 overexpression. Our findings point to Atf6 as a potential therapeutic target for fatty liver disease.
Collapse
|
47
|
González-Rodríguez Á, Mayoral R, Agra N, Valdecantos MP, Pardo V, Miquilena-Colina ME, Vargas-Castrillón J, Lo Iacono O, Corazzari M, Fimia GM, Piacentini M, Muntané J, Boscá L, García-Monzón C, Martín-Sanz P, Valverde ÁM. Impaired autophagic flux is associated with increased endoplasmic reticulum stress during the development of NAFLD. Cell Death Dis 2014; 5:e1179. [PMID: 24743734 PMCID: PMC4001315 DOI: 10.1038/cddis.2014.162] [Citation(s) in RCA: 425] [Impact Index Per Article: 42.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 03/05/2014] [Accepted: 03/10/2014] [Indexed: 02/06/2023]
Abstract
The pathogenic mechanisms underlying the progression of non-alcoholic fatty liver disease (NAFLD) are not fully understood. In this study, we aimed to assess the relationship between endoplasmic reticulum (ER) stress and autophagy in human and mouse hepatocytes during NAFLD. ER stress and autophagy markers were analyzed in livers from patients with biopsy-proven non-alcoholic steatosis (NAS) or non-alcoholic steatohepatitis (NASH) compared with livers from subjects with histologically normal liver, in livers from mice fed with chow diet (CHD) compared with mice fed with high fat diet (HFD) or methionine-choline-deficient (MCD) diet and in primary and Huh7 human hepatocytes loaded with palmitic acid (PA). In NASH patients, significant increases in hepatic messenger RNA levels of markers of ER stress (activating transcription factor 4 (ATF4), glucose-regulated protein 78 (GRP78) and C/EBP homologous protein (CHOP)) and autophagy (BCN1) were found compared with NAS patients. Likewise, protein levels of GRP78, CHOP and p62/SQSTM1 (p62) autophagic substrate were significantly elevated in NASH compared with NAS patients. In livers from mice fed with HFD or MCD, ER stress-mediated signaling was parallel to the blockade of the autophagic flux assessed by increases in p62, microtubule-associated protein 2 light chain 3 (LC3-II)/LC3-I ratio and accumulation of autophagosomes compared with CHD fed mice. In Huh7 hepatic cells, treatment with PA for 8 h triggered activation of both unfolding protein response and the autophagic flux. Conversely, prolonged treatment with PA (24 h) induced ER stress and cell death together with a blockade of the autophagic flux. Under these conditions, cotreatment with rapamycin or CHOP silencing ameliorated these effects and decreased apoptosis. Our results demonstrated that the autophagic flux is impaired in the liver from both NAFLD patients and murine models of NAFLD, as well as in lipid-overloaded human hepatocytes, and it could be due to elevated ER stress leading to apoptosis. Consequently, therapies aimed to restore the autophagic flux might attenuate or prevent the progression of NAFLD.
Collapse
Affiliation(s)
- Á González-Rodríguez
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Barcelona, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
| | - R Mayoral
- Division of Endocrinology and Metabolism, Department of Medicine, University of California, San Diego, La Jolla, CA, 92093, USA
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
| | - N Agra
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
| | - M P Valdecantos
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Barcelona, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
| | - V Pardo
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Barcelona, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
| | - M E Miquilena-Colina
- Liver Research Unit, Hospital Universitario Santa Cristina, Instituto de Investigación Sanitaria Princesa, Madrid, Spain
| | - J Vargas-Castrillón
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
- Liver Research Unit, Hospital Universitario Santa Cristina, Instituto de Investigación Sanitaria Princesa, Madrid, Spain
| | - O Lo Iacono
- Gastroenterology Unit, Hospital del Tajo, Aranjuez, Madrid, Spain
| | - M Corazzari
- National Institute for Infectious Diseases IRCCS ‘L Spallanzani', Rome, Italy
| | - G M Fimia
- National Institute for Infectious Diseases IRCCS ‘L Spallanzani', Rome, Italy
| | - M Piacentini
- National Institute for Infectious Diseases IRCCS ‘L Spallanzani', Rome, Italy
- Department of Biology, University of Rome ‘Tor Vergata', Rome, Italy
| | - J Muntané
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
- Oncology Surgery, Cell Therapy and Transplant Organs, Institute of Biomedicine of Seville (IBiS)/Virgen del Rocio Universitary Hospital/CSIC/University of Seville, Seville, Spain
| | - L Boscá
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
| | - C García-Monzón
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
- Liver Research Unit, Hospital Universitario Santa Cristina, Instituto de Investigación Sanitaria Princesa, Madrid, Spain
- Liver Research Unit, Hospital Universitario Santa Cristina, Instituto de Investigación Sanitaria Princesa, Calle del Maestro Amadeo Vives, 2, 28009 Madrid, Spain. Tel: +34 91 5574402; Fax: +34 91 5574400; E-mail:
| | - P Martín-Sanz
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), ISCIII, Barcelona, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols', Consejo Superior de Investigaciones Científicas, C/Arturo Duperier 4, 28029 Madrid, Spain. Tel: +34 91 4972746; Fax: +34 91 5854401; E-mail: (PM-S) or Tel: +34 915854497; Fax: +34 915854401; E-mail: (ÁMV)
| | - Á M Valverde
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Barcelona, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols' (CSIC/UAM), Madrid, Spain
- Instituto de Investigaciones Biomédicas ‘Alberto Sols', Consejo Superior de Investigaciones Científicas, C/Arturo Duperier 4, 28029 Madrid, Spain. Tel: +34 91 4972746; Fax: +34 91 5854401; E-mail: (PM-S) or Tel: +34 915854497; Fax: +34 915854401; E-mail: (ÁMV)
| |
Collapse
|
48
|
Zhang XQ, Xu CF, Yu CH, Chen WX, Li YM. Role of endoplasmic reticulum stress in the pathogenesis of nonalcoholic fatty liver disease. World J Gastroenterol 2014; 20:1768-1776. [PMID: 24587654 PMCID: PMC3930975 DOI: 10.3748/wjg.v20.i7.1768] [Citation(s) in RCA: 203] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 09/30/2013] [Accepted: 12/06/2013] [Indexed: 02/06/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) has emerged as a common public health problem in recent decades. However, the underlying mechanisms leading to the development of NAFLD are not fully understood. The endoplasmic reticulum (ER) stress response has recently been proposed to play a crucial role in both the development of steatosis and progression to nonalcoholic steatohepatitis. ER stress is activated to regulate protein synthesis and restore homeostatic equilibrium when the cell is stressed due to the accumulation of unfolded or misfolded proteins. However, delayed or insufficient responses to ER stress may turn physiological mechanisms into pathological consequences, including fat accumulation, insulin resistance, inflammation, and apoptosis, all of which play important roles in the pathogenesis of NAFLD. Therefore, understanding the role of ER stress in the pathogenesis of NAFLD has become a topic of intense investigation. This review highlights the recent findings linking ER stress signaling pathways to the pathogenesis of NAFLD.
Collapse
|
49
|
Pan MH, Lai CS, Tsai ML, Ho CT. Chemoprevention of nonalcoholic fatty liver disease by dietary natural compounds. Mol Nutr Food Res 2013; 58:147-71. [PMID: 24302567 DOI: 10.1002/mnfr.201300522] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 09/25/2013] [Accepted: 10/09/2013] [Indexed: 02/06/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) refers to a wide spectrum of liver disease that is not from excess alcohol consumption, but is often associated with obesity, type 2 diabetes, and metabolic syndrome. NAFLD pathogenesis is complicated and involves oxidative stress, lipotoxicity, mitochondrial damage, insulin resistance, inflammation, and excessive dietary fat intake, which increase hepatic lipid influx and de novo lipogenesis and impair insulin signaling, thus promoting hepatic triglyceride accumulation and ultimately NAFLD. Overproduction of proinflammatory adipokines from adipose tissue also affects hepatic metabolic function. Current NAFLD therapies are limited; thus, much attention has been focused on identification of potential dietary substances from fruits, vegetables, and edible plants to provide a new strategy for NAFLD treatment. Dietary natural compounds, such as carotenoids, omega-3-PUFAs, flavonoids, isothiocyanates, terpenoids, curcumin, and resveratrol, act through a variety of mechanisms to prevent and improve NAFLD. Here, we summarize and briefly discuss the currently known targets and signaling pathways as well as the role of dietary natural compounds that interfere with NAFLD pathogenesis.
Collapse
Affiliation(s)
- Min-Hsiung Pan
- Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | | | | | | |
Collapse
|
50
|
Abstract
The unfolded protein response (UPR) is a protective cellular response activated under conditions of endoplasmic reticulum (ER) stress. The hepatic UPR is activated in several forms of liver disease including nonalcoholic fatty liver disease (NAFLD). Recent data defining the role of the UPR in hepatic lipid metabolism have identified molecular mechanisms that may underlie the association between UPR activation and NAFLD. It has become increasingly evident that the IRE1α/Xbp1 pathway of the UPR is critical for hepatic lipid homeostasis, and dysregulation of this evolutionarily conserved pathway is associated with human nonalcoholic steatohepatitis (NASH). Although increasing evidence has delineated the importance of UPR pathway signaling in fatty liver disorders, the regulation of the hepatic UPR in normal physiology and fatty liver disorders remains incompletely understood. Understanding the role of the UPR in hepatic lipid metabolism may lead to the identification of novel therapeutic targets for the treatment of NAFLD.
Collapse
Affiliation(s)
- Anne Henkel
- Assistant Professor of Medicine, Division of Gastroenterology and Hepatology, Section of Hepatology, Northwestern University Feinberg School of Medicine, Tarry Building 15-705, 303 East Chicago Avenue, Chicago, IL 60611, Tel: 312-503-3148, Fax: 312-908-9032
| | - Richard M. Green
- Professor of Medicine, Division of Gastroenterology and Hepatology, Section of Hepatology, Northwestern University Feinberg School of Medicine, Tarry Building 15-719, 303 East Chicago Avenue, Chicago, IL 60611, Tel: 312-503-1812, Fax: 312-908-9032
| |
Collapse
|