1
|
Aibara D, Sakaguchi A, Matsusue K. Oxysterol-binding protein-like 3 is a novel target gene of peroxisome proliferator-activated receptor γ in fatty liver disease. Mol Cell Endocrinol 2023; 565:111887. [PMID: 36781118 DOI: 10.1016/j.mce.2023.111887] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 02/07/2023] [Accepted: 02/10/2023] [Indexed: 02/13/2023]
Abstract
Oxysterol-binding protein-like 3 (OSBPL3) plays a key role in the development of fatty liver disease. Herein, we found that OSBPL3 is highly expressed in the fatty liver of humans and mice. Although high expression of Osbpl3 was observed in the fatty liver of type 2 diabetic ob/ob mice, liver-specific Pparg knockout ameliorated this increase in these mice. Moreover, high hepatic Osbpl3 expression was observed in other mice models of fatty liver disease, such as leptin receptor-mutant db/db and alcohol-fed mice. Analysis of the human liver transcriptome data revealed that hepatic OSBPL3 expression is higher in patients with advanced non-alcoholic fatty liver disease (NAFLD) when compared to those with mild NAFLD. Reporter and electrophoretic mobility shift assays showed that PPARγ positively regulates Osbpl3 transcription by binding to the two functional PPARγ-responsive elements present in the 5' upstream region. Overall, our results indicate that Osbpl3 is a novel PPARγ target in the fatty liver.
Collapse
Affiliation(s)
- Daisuke Aibara
- Faculty of Pharmaceutical Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Ai Sakaguchi
- Faculty of Pharmaceutical Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Kimihiko Matsusue
- Faculty of Pharmaceutical Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan.
| |
Collapse
|
2
|
Freitas IN, da Silva Jr JA, de Oliveira KM, Lourençoni Alves B, Dos Reis Araújo T, Camporez JP, Carneiro EM, Davel AP. Insights by which TUDCA is a potential therapy against adiposity. Front Endocrinol (Lausanne) 2023; 14:1090039. [PMID: 36896173 PMCID: PMC9989466 DOI: 10.3389/fendo.2023.1090039] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 02/10/2023] [Indexed: 02/23/2023] Open
Abstract
Adipose tissue is an organ with metabolic and endocrine activity. White, brown and ectopic adipose tissues have different structure, location, and function. Adipose tissue regulates energy homeostasis, providing energy in nutrient-deficient conditions and storing it in high-supply conditions. To attend to the high demand for energy storage during obesity, the adipose tissue undergoes morphological, functional and molecular changes. Endoplasmic reticulum (ER) stress has been evidenced as a molecular hallmark of metabolic disorders. In this sense, the ER stress inhibitor tauroursodeoxycholic acid (TUDCA), a bile acid conjugated to taurine with chemical chaperone activity, has emerged as a therapeutic strategy to minimize adipose tissue dysfunction and metabolic alterations associated with obesity. In this review, we highlight the effects of TUDCA and receptors TGR5 and FXR on adipose tissue in the setting of obesity. TUDCA has been demonstrated to limit metabolic disturbs associated to obesity by inhibiting ER stress, inflammation, and apoptosis in adipocytes. The beneficial effect of TUDCA on perivascular adipose tissue (PVAT) function and adiponectin release may be related to cardiovascular protection in obesity, although more studies are needed to clarify the mechanisms. Therefore, TUDCA has emerged as a potential therapeutic strategy for obesity and comorbidities.
Collapse
Affiliation(s)
- Israelle Netto Freitas
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, SP, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, Campinas, SP, Brazil
| | | | | | | | | | - João Paulo Camporez
- Department of Physiology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Everardo Magalhães Carneiro
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, SP, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, Campinas, SP, Brazil
| | - Ana Paula Davel
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, SP, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, Campinas, SP, Brazil
- *Correspondence: Ana Paula Davel,
| |
Collapse
|
3
|
Subramanian P, Gargani S, Palladini A, Chatzimike M, Grzybek M, Peitzsch M, Papanastasiou AD, Pyrina I, Ntafis V, Gercken B, Lesche M, Petzold A, Sinha A, Nati M, Thangapandi VR, Kourtzelis I, Andreadou M, Witt A, Dahl A, Burkhardt R, Haase R, Domingues AMDJ, Henry I, Zamboni N, Mirtschink P, Chung KJ, Hampe J, Coskun Ü, Kontoyiannis DL, Chavakis T. The RNA binding protein human antigen R is a gatekeeper of liver homeostasis. Hepatology 2022; 75:881-897. [PMID: 34519101 DOI: 10.1002/hep.32153] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 09/08/2021] [Accepted: 09/10/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIMS NAFLD is initiated by steatosis and can progress through fibrosis and cirrhosis to HCC. The RNA binding protein human antigen R (HuR) controls RNAs at the posttranscriptional level; hepatocyte HuR has been implicated in the regulation of diet-induced hepatic steatosis. The present study aimed to understand the role of hepatocyte HuR in NAFLD development and progression to fibrosis and HCC. APPROACH AND RESULTS Hepatocyte-specific, HuR-deficient mice and control HuR-sufficient mice were fed either a normal diet or an NAFLD-inducing diet. Hepatic lipid accumulation, inflammation, fibrosis, and HCC development were studied by histology, flow cytometry, quantitative PCR, and RNA sequencing. The liver lipidome was characterized by lipidomics analysis, and the HuR-RNA interactions in the liver were mapped by RNA immunoprecipitation sequencing. Hepatocyte-specific, HuR-deficient mice displayed spontaneous hepatic steatosis and fibrosis predisposition compared to control HuR-sufficient mice. On an NAFLD-inducing diet, hepatocyte-specific HuR deficiency resulted in exacerbated inflammation, fibrosis, and HCC-like tumor development. A multi-omic approach, including lipidomics, transcriptomics, and RNA immunoprecipitation sequencing revealed that HuR orchestrates a protective network of hepatic-metabolic and lipid homeostasis-maintaining pathways. Consistently, HuR-deficient livers accumulated, already at steady state, a triglyceride signature resembling that of NAFLD livers. Moreover, up-regulation of secreted phosphoprotein 1 expression mediated, at least partially, fibrosis development in hepatocyte-specific HuR deficiency on an NAFLD-inducing diet, as shown by experiments using antibody blockade of osteopontin. CONCLUSIONS HuR is a gatekeeper of liver homeostasis, preventing NAFLD-related fibrosis and HCC, suggesting that the HuR-dependent network could be exploited therapeutically.
Collapse
Affiliation(s)
- Pallavi Subramanian
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Sofia Gargani
- Institute for Fundamental Biomedical Research (IFBR), Biomedical Sciences Research Centre "Alexander Fleming"VariGreece
| | - Alessandra Palladini
- Paul Langerhans Institute Dresden, Helmholtz Zentrum München, University Hospital and Faculty of MedicineTechnische Universität DresdenDresdenGermany.,German Center for Diabetes ResearchNeuherbergGermany
| | - Margarita Chatzimike
- Institute for Fundamental Biomedical Research (IFBR), Biomedical Sciences Research Centre "Alexander Fleming"VariGreece
| | - Michal Grzybek
- Paul Langerhans Institute Dresden, Helmholtz Zentrum München, University Hospital and Faculty of MedicineTechnische Universität DresdenDresdenGermany.,German Center for Diabetes ResearchNeuherbergGermany
| | - Mirko Peitzsch
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Anastasios D Papanastasiou
- Department of Biomedical SciencesUniversity of West AtticaAthensGreece.,Histopathology UnitBiomedical Sciences Research Center "Alexander Fleming"VariGreece
| | - Iryna Pyrina
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Vasileios Ntafis
- Institute for Fundamental Biomedical Research (IFBR), Biomedical Sciences Research Centre "Alexander Fleming"VariGreece
| | - Bettina Gercken
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Mathias Lesche
- DRESDEN-concept Genome CenterCenter for Molecular and Cellular BioengineeringTechnische Universität DresdenDresdenGermany
| | - Andreas Petzold
- DRESDEN-concept Genome CenterCenter for Molecular and Cellular BioengineeringTechnische Universität DresdenDresdenGermany
| | - Anupam Sinha
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Marina Nati
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Veera Raghavan Thangapandi
- Department of Internal Medicine IUniversity Hospital and Faculty of Medicine, Technische Universität DresdenDresdenGermany
| | - Ioannis Kourtzelis
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany.,National Center for Tumor DiseasesPartner Site Dresden, Dresden and German Cancer Research CenterHeidelbergGermany.,York Biomedical Research Institute, Hull York Medical SchoolUniversity of YorkYorkUK
| | - Margarita Andreadou
- Institute for Fundamental Biomedical Research (IFBR), Biomedical Sciences Research Centre "Alexander Fleming"VariGreece
| | - Anke Witt
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Andreas Dahl
- DRESDEN-concept Genome CenterCenter for Molecular and Cellular BioengineeringTechnische Universität DresdenDresdenGermany
| | - Ralph Burkhardt
- Institute of Clinical Chemistry and Laboratory MedicineUniversity Hospital RegensburgRegensburgGermany
| | - Robert Haase
- Scientific Computing FacilityMax Planck Institute of Molecular Cell Biology and GeneticsDresdenGermany
| | | | - Ian Henry
- Scientific Computing FacilityMax Planck Institute of Molecular Cell Biology and GeneticsDresdenGermany
| | - Nicola Zamboni
- Institute of Molecular Systems BiologyETH ZurichZurichSwitzerland
| | - Peter Mirtschink
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Kyoung-Jin Chung
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany
| | - Jochen Hampe
- Department of Internal Medicine IUniversity Hospital and Faculty of Medicine, Technische Universität DresdenDresdenGermany
| | - Ünal Coskun
- Paul Langerhans Institute Dresden, Helmholtz Zentrum München, University Hospital and Faculty of MedicineTechnische Universität DresdenDresdenGermany.,German Center for Diabetes ResearchNeuherbergGermany
| | - Dimitris L Kontoyiannis
- Institute for Fundamental Biomedical Research (IFBR), Biomedical Sciences Research Centre "Alexander Fleming"VariGreece.,Department of Genetics, Development & Molecular Biology, School of BiologyAristotle University of ThessalonikiThessalonikiGreece
| | - Triantafyllos Chavakis
- Institute for Clinical Chemistry and Laboratory MedicineFaculty of MedicineTechnische Universität DresdenDresdenGermany.,Paul Langerhans Institute Dresden, Helmholtz Zentrum München, University Hospital and Faculty of MedicineTechnische Universität DresdenDresdenGermany.,German Center for Diabetes ResearchNeuherbergGermany.,National Center for Tumor DiseasesPartner Site Dresden, Dresden and German Cancer Research CenterHeidelbergGermany
| |
Collapse
|
4
|
Li Y, Zhao D, Qian M, Liu J, Pan C, Zhang X, Duan X, Zhang Y, Jia W, Wang L. Amlodipine, an anti-hypertensive drug, alleviates non-alcoholic fatty liver disease by modulating gut microbiota. Br J Pharmacol 2021; 179:2054-2077. [PMID: 34862599 DOI: 10.1111/bph.15768] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 11/08/2021] [Accepted: 11/21/2021] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND AND PURPOSE Non-alcoholic fatty liver disease (NAFLD) represents a severe public health problem. It often coexists with hypertension in the context of metabolic syndrome. Here, we investigated the effects of amlodipine on non-alcoholic fatty liver disease combined with hypertension and the underlying mechanism. EXPERIMENTAL APPROACH mice were fed with high-fat diet and 0.05% N-Nitro-L-arginine methylester sterile water to induce NAFLD with hypertension. Gut microbiota composition and function were assessed by 16S ribosomal DNA and metagenomic sequencing. Untargeted metabolome profiles were applied to identify differential metabolites in mice cecum. KEY RESULTS Amlodipine besylate (AB) and amlodipine aspartate (AA) significantly decreased liver injury, hepatic steatosis and improved lipid metabolism with a concomitant reduction in the expression of lipogenic genes in mice with NAFLD and hypertension. Mechanistically, AA and AB have potential in restoring intestinal barrier integrity and improving antimicrobial defense along with the elevated abundances of Akkermansia, Bacteroides and Lactobacillus. Noteworthily, the gut microbiota in AB and AA-treated mice had higher abundance of functional genes involved in taurine and hypotaurine metabolism. Consistently, the strengthened taurine and hypotaurine metabolism was confirmed by the untargeted metabolome analysis. Based on the correlation and causal analysis, the altered gut microbiota composition and the enhancement of taurine and hypotaurine metabolism may synergistically decreased ALT, liver triglycerides, lipogenic genes and plasma cholesterol in HFD-fed hypertensive mice. CONCLUSION AND IMPLICATIONS Collectively, AA and AB exert multi-factorial improvements in NAFLD and hypertension by modulating gut microbiota, and may serve as a promising therapeutic agent for treating these diseases.
Collapse
Affiliation(s)
- Yang Li
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Danyang Zhao
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Minyi Qian
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Jun Liu
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Chuyue Pan
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Xinxin Zhang
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Xubin Duan
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Yufei Zhang
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Wenxin Jia
- School of Basic Medicine and Clinical Pharmacy, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Lirui Wang
- Institute of Modern Biology, Nanjing University, Nanjing, China
| |
Collapse
|
5
|
Ahn TK, Kim KT, Joshi HP, Park KH, Kyung JW, Choi UY, Sohn S, Sheen SH, Shin DE, Lee SH, Han IB. Therapeutic Potential of Tauroursodeoxycholic Acid for the Treatment of Osteoporosis. Int J Mol Sci 2020; 21:ijms21124274. [PMID: 32560070 PMCID: PMC7349164 DOI: 10.3390/ijms21124274] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/14/2020] [Accepted: 06/15/2020] [Indexed: 02/07/2023] Open
Abstract
Tauroursodeoxycholic acid (TUDCA) is a US FDA-approved hydrophilic bile acid for the treatment of chronic cholestatic liver disease. In the present study, we investigate the effects of TUDCA on the proliferation and differentiation of osteoblasts and its therapeutic effect on a mice model of osteoporosis. Following treatment with different concentrations of TUDCA, cell viability, differentiation, and mineralization were measured. Three-month-old female C57BL/6 mice were randomly divided into three groups (n = 8 mice per group): (i) normal mice as the control group, (ii) ovariectomy (OVX) group (receiving phosphate-buffered saline (PBS) treatment every other day for 4 weeks), and (iii) OVX group with TUDCA (receiving TUDCA treatment every other day for 4 weeks starting 6 weeks after OVX). At 11 weeks post-surgery, serum levels of procollagen type I N-terminal propeptides (PINP) and type I collagen crosslinked C-telopeptides (CTX) were measured, and all mice were sacrificed to examine the distal femur by micro-computed tomography (CT) scans and histology. TUDCA (100 nM, 1 µM) significantly increased the proliferation and viability of osteoblasts and osteoblast differentiation and mineralization when used in vitro. Furthermore, TUDCA neutralized the detrimental effects of methylprednisolone (methylprednisolone-induced osteoblast apoptosis). In the TUDCA treatment group the PINP level was higher and the CTX level was lower, but these levels were not significantly different compared to the PBS treatment group. Micro-CT and histology showed that the TUDCA treatment group preserved more trabecular structures in the distal femur compared to the PBS treatment group. In addition, the TUDCA treatment group increased the percentage bone volume with respect to the total bone volume, bone mineral density, and mice distal femur trabeculae compared with the PBS treatment group. Taken together, our findings suggest that TUDCA may provide a favorable effect on bones and could be used for the prevention and treatment of osteoporosis.
Collapse
Affiliation(s)
- Tae-Keun Ahn
- Department of Orthopedic Surgery, CHA Bundang Medical Center, School of Medicine CHA University, Seongnam-si, Gyeonggi-do 13496, Korea; (T.-K.A.); (D.-E.S.)
| | - Kyoung-Tae Kim
- Department of Neurosurgery, School of Medicine, Kyungpook National University, Daegu 41944, Korea;
- Department of Neurosurgery, Kyungpook National University Hospital, Daegu 41944, Korea
| | - Hari Prasad Joshi
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
| | - Kwang Hwan Park
- Department of Orthopedic Surgery, Yonsei University, Severance Hospital, Seoul 03772, Korea;
| | - Jae Won Kyung
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
| | - Un-Yong Choi
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
| | - Seil Sohn
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
| | - Seung-Hun Sheen
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
| | - Dong-Eun Shin
- Department of Orthopedic Surgery, CHA Bundang Medical Center, School of Medicine CHA University, Seongnam-si, Gyeonggi-do 13496, Korea; (T.-K.A.); (D.-E.S.)
| | - Soo-Hong Lee
- Department of Medical Biotechnology, Dongguk University-Seoul, Seoul 04620, Korea
- Correspondence: (S.-H.L.); (I.-B.H.); Tel.: +82-2-2260-3114 (S.-H.L.); +82-31-780-1924 (I.-B.H.); Fax: +82-2-2277-1274 (S.-H.L.); +82-31-780-5269 (I.-B.H.)
| | - In-Bo Han
- Department of Neurosurgery, CHA University School of medicine, CHA Bundang Medical Center, Seongnam-si, Gyeonggi-do 13496, Korea; (H.P.J.); (J.W.K.); (U.-Y.C.); (S.S.); (S.-H.S.)
- Correspondence: (S.-H.L.); (I.-B.H.); Tel.: +82-2-2260-3114 (S.-H.L.); +82-31-780-1924 (I.-B.H.); Fax: +82-2-2277-1274 (S.-H.L.); +82-31-780-5269 (I.-B.H.)
| |
Collapse
|
6
|
Su K, Huang X, Xu K, Du W, Zhu D, Yang M, Yuan W, Li L. Transcriptomics Curation of SARS-CoV-2 Related Host Genes in Mice With COVID-19 Comorbidity: A Pilot Study. INFECTIOUS MICROBES & DISEASES 2020; 2:42-47. [PMID: 38630104 PMCID: PMC8529699 DOI: 10.1097/im9.0000000000000025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 04/23/2020] [Accepted: 04/26/2020] [Indexed: 11/26/2022]
Abstract
The pandemic of coronavirus disease 2019 (COVID-19), a respiratory disease caused by a novel severe acute respiratory syndrome coronavirus-2, is causing substantial morbidity and mortality. Along with the respiratory symptoms, underlying diseases in senior patients, such as diabetes, hypertension, and coronary heart disease, are the most common comorbidities, which cause more severe outcomes and even death. During cellular attachment and entry of severe acute respiratory syndrome coronavirus-2, the key protein involved is the angiotensin I converting enzyme 2 (ACE2), which is located on the membrane of host cells. Here, we aim to curate an expression profile of Ace2 and other COVID-19 related genes across the available diabetes murine strains. Based on strictly manual curation and bioinformatics analysis of the publicly deposited expression datasets, Ace2 and other potentially involved genes such as Furin, Tmprss2, Ang, and Ang2 were examined. We found that Ace2 expression is rather ubiquitous in three selected diabetes prone strains (db/db, ob/ob and diet-induced obese). With the most abundant datasets present, the liver shows a medium Ace2 expression level compared with the lungs, pancreatic islets, brain and even T cells. Age is a more critical factor for Ace2 expression in db/db compared with the other two strains. Besides Ace2, the other four host genes showed varied levels of correlation to each other. To accelerate research on the interaction between COVID-19 and underlying diseases, the Murine4Covid transcriptomics database (www.geneureka.org/Murine4Covid) will facilitate the design of research on COVID-19 and comorbidities.
Collapse
Affiliation(s)
- Kunkai Su
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
- KS and XH contributed equally to this study
| | - Xin Huang
- Biotherapeutics Research Center, the Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
- KS and XH contributed equally to this study
| | - Kaijin Xu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Weibo Du
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Danhua Zhu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Meifang Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Wenji Yuan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Lanjuan Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| |
Collapse
|
7
|
Bal NB, Han S, Kiremitci S, Uludag MO, Demirel-Yilmaz E. Reversal of deleterious effect of hypertension on the liver by inhibition of endoplasmic reticulum stress. Mol Biol Rep 2020; 47:2243-2252. [PMID: 32072406 DOI: 10.1007/s11033-020-05329-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/13/2020] [Indexed: 11/25/2022]
Abstract
Hypertension is an important risk factor for cardiovascular diseases. Besides cardiovascular system, it could cause damage to liver. It has been shown that endoplasmic reticulum stress (ERS) plays a crucial role in the pathogenesis of hypertension. ERS inhibitor tauroursodeoxycholic-acid (TUDCA) has favorable effects on various pathologies including cardiovascular, metabolic and hepatic diseases. In this study, the hepatoprotective effect and mechanism of TUDCA were investigated in the deoxycorticosterone acetate (DOCA)-salt-induced hypertension. Male Wistar rats were used and divided into four groups: Control, DOCA, TUDCA and DOCA + TUDCA. Hypertension was induced by DOCA-salt administration for twelve weeks after the unilateral nephrectomy. TUDCA was given for the last 4 weeks. Systolic blood pressure was measured by using tail-cuff method. At the end of the treatment, liver was isolated and weighed. The expressions of various proteins and histopathological evaluation were examined in the liver. TUDCA markedly decreased systolic blood pressure in the hypertensive animals. Hypertension caused increase in the expressions of glucose-regulated protein-78 (GRP78), matrix metalloproteinase-2 (MMP-2) and phospho-inhibitor κB-α (p-IκB-α) and the decrease in the expression of sarcoplasmic/endoplasmic reticulum Ca2+-ATPase2 (SERCA2) and phospho-extracellular signal-regulated kinase (p-ERK) in the liver. Alterations in these protein expressions were not detected in the TUDCA-treated hypertensive group. Also, hepatic balloon degeneration, inflammation and fibrosis were observed in the hypertensive group. TUDCA improved inflammation and fibrosis in the hypertensive liver. Our findings indicate that the detrimental effect of DOCA-salt-induced hypertension on the liver was defended by the inhibition of ERS. Hepatic ERS and its treatment should be taken into consideration for therapeutic approaches to hypertension.
Collapse
Affiliation(s)
- Nur Banu Bal
- Department of Pharmacology, Faculty of Pharmacy, Gazi University, Etiler, 06330, Ankara, Turkey.
| | - Sevtap Han
- Department of Pharmacology, Faculty of Pharmacy, Gazi University, Etiler, 06330, Ankara, Turkey
| | - Saba Kiremitci
- Department of Pathology, Faculty of Medicine, Ankara University, Sihhiye, 06100, Ankara, Turkey
| | - Mecit Orhan Uludag
- Department of Pharmacology, Faculty of Pharmacy, Gazi University, Etiler, 06330, Ankara, Turkey
| | - Emine Demirel-Yilmaz
- Department of Medical Pharmacology, Faculty of Medicine, Ankara University, Sihhiye, 06100, Ankara, Turkey
| |
Collapse
|
8
|
Ma Z, Wang X, Yin P, Wu R, Zhou L, Xu G, Niu J. Serum metabolome and targeted bile acid profiling reveals potential novel biomarkers for drug-induced liver injury. Medicine (Baltimore) 2019; 98:e16717. [PMID: 31374067 PMCID: PMC6708818 DOI: 10.1097/md.0000000000016717] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
This study aims to determine the non-invasive, reliable and sensitive biochemical parameters for the diagnosis of drug-induced liver injury (DILI).Ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) and selected reaction monitoring (SRM) were used to profile the serum metabolome and quantify 15 targeted bile acid metabolites, respectively, in samples obtained from 38 DILI patients and 30 healthy controls.A comparison of the resulting serum metabolome profiles of the study participants revealed significant differences between DILI patients and healthy controls. Specifically, serum palmitic acid, taurochenodeoxycholic acid, glycocholic acid (GCA), and tauroursodeoxycholic acid (TUDCA) levels were significantly higher, and serum lysophosphatidylethanolamine levels were significantly lower in DILI patients vs healthy controls (P < .001). Furthermore, the SRM assay of bile acids revealed that the increase in GCA, taurocholic acid (TCA), TUDCA, glycochenodeoxycholic acid (GCDCA), glycochenodeoxycholic sulfate (GCDCS), and taurodeoxycholic acid (TDCA) corresponded to a higher degree of liver damage. These results also indicate that serum concentrations of chenodeoxycholic acid (CDCA), deoxycholic acid (DCA) and lithocholic acid (LCA) were significantly lower in patients with severe DILI, when compared to healthy controls, and that this decrease was closely correlated to the severity of liver damage.Taken together, these results demonstrate that bile acids could serve as potential biomarkers for the early diagnosis and severity of DILI.
Collapse
Affiliation(s)
- Zhenhua Ma
- Department of Hepatology, the First Hospital of Jilin University, Changchun
- Department of Hepatology, the Affiliated Hospital of Beihua University, Jilin
| | - Xiaomei Wang
- Department of Hepatology, the First Hospital of Jilin University, Changchun
| | - Peiyuan Yin
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Ruihong Wu
- Department of Hepatology, the First Hospital of Jilin University, Changchun
| | - Lina Zhou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Junqi Niu
- Department of Hepatology, the First Hospital of Jilin University, Changchun
| |
Collapse
|
9
|
Parafati M, Kirby RJ, Khorasanizadeh S, Rastinejad F, Malany S. A nonalcoholic fatty liver disease model in human induced pluripotent stem cell-derived hepatocytes, created by endoplasmic reticulum stress-induced steatosis. Dis Model Mech 2018; 11:11/9/dmm033530. [PMID: 30254132 PMCID: PMC6176998 DOI: 10.1242/dmm.033530] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 08/08/2018] [Indexed: 12/14/2022] Open
Abstract
Hepatic steatosis, a reversible state of metabolic dysregulation, can promote the onset of nonalcoholic steatohepatitis (NASH), and its transition is thought to be critical in disease evolution. The association between endoplasmic reticulum (ER) stress response and hepatocyte metabolism disorders prompted us to characterize ER stress-induced hepatic metabolic dysfunction in human induced pluripotent stem cell-derived hepatocytes (hiPSC-Hep), to explore regulatory pathways and validate a phenotypic in vitro model for progression of liver steatosis. We treated hiPSC-Hep with a ratio of unsaturated and saturated fatty acids in the presence of an inducer of ER stress to synergistically promote triglyceride accumulation and dysregulate lipid metabolism. We monitored lipid accumulation by high-content imaging and measured gene regulation by RNA sequencing and reverse transcription quantitative PCR analyses. Our results show that ER stress potentiated intracellular lipid accumulation by 5-fold in hiPSC-Hep in the absence of apoptosis. Transcriptome pathway analysis identified ER stress pathways as the most significantly dysregulated of all pathways affected. Obeticholic acid dose dependently inhibited lipid accumulation and modulated gene expression downstream of the farnesoid X receptor. We were able to identify modulation of hepatic markers and gene pathways known to be involved in steatosis and nonalcoholic fatty liver disease (NAFLD), in support of a hiPSC-Hep disease model that is relevant to clinical data for human NASH. Our results show that the model can serve as a translational discovery platform for the understanding of molecular pathways involved in NAFLD, and can facilitate the identification of novel therapeutic molecules based on high-throughput screening strategies. Summary: Our study demonstrates expanded use of human induced pluripotent stem cell-derived hepatocytes for molecular studies and drug screening, to evaluate new therapeutics with an antisteatotic mechanism of action for nonalcoholic fatty liver disease.
Collapse
Affiliation(s)
- Maddalena Parafati
- Translational Biology, Conrad Prebys Center for Chemical Genomics, Orlando, FL 32827, USA
| | - R Jason Kirby
- Translational Biology, Conrad Prebys Center for Chemical Genomics, Orlando, FL 32827, USA
| | - Sepideh Khorasanizadeh
- Center for Metabolic Origins of Disease, Sanford Burham Prebys Medical Discovery Institute, 6400 Sanger Rd, Orlando, FL 32827, USA
| | - Fraydoon Rastinejad
- Center for Metabolic Origins of Disease, Sanford Burham Prebys Medical Discovery Institute, 6400 Sanger Rd, Orlando, FL 32827, USA
| | - Siobhan Malany
- Translational Biology, Conrad Prebys Center for Chemical Genomics, Orlando, FL 32827, USA
| |
Collapse
|
10
|
Cross TWL, Kasahara K, Rey FE. Sexual dimorphism of cardiometabolic dysfunction: Gut microbiome in the play? Mol Metab 2018; 15:70-81. [PMID: 29887245 PMCID: PMC6066746 DOI: 10.1016/j.molmet.2018.05.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 05/22/2018] [Accepted: 05/24/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Sex is one of the most powerful modifiers of disease development. Clear sexual dimorphism exists in cardiometabolic health susceptibility, likely due to differences in sex steroid hormones. Changes in the gut microbiome have been linked with the development of obesity, type 2 diabetes, and atherosclerosis; however, the impact of microbes in sex-biased cardiometabolic disorders remains unclear. The gut microbiome is critical for maintaining a normal estrous cycle, testosterone levels, and reproductive function. Gut microbes modulate the enterohepatic recirculation of estrogens and androgens, affecting local and systemic levels of sex steroid hormones. Gut bacteria can also generate androgens from glucocorticoids. SCOPE OF REVIEW This review summarizes current knowledge of the complex interplay between sexual dimorphism in cardiometabolic disease and the gut microbiome. MAJOR CONCLUSIONS Emerging evidence suggests the role of gut microbiome as a modifier of disease susceptibility due to sex; however, the impact on cardiometabolic disease in this complex interplay is lacking. Elucidating the role of gut microbiome on sex-biased susceptibility in cardiometabolic disease is of high relevance to public health given its high prevalence and significant financial burden.
Collapse
Affiliation(s)
- Tzu-Wen L Cross
- Cardiovascular Research Center, University of Wisconsin-Madison, Madison, WI, 53705, United States; Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, 53706, United States.
| | - Kazuyuki Kasahara
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, 53706, United States.
| | - Federico E Rey
- Cardiovascular Research Center, University of Wisconsin-Madison, Madison, WI, 53705, United States; Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, 53706, United States.
| |
Collapse
|
11
|
Tsuchida T, Lee YA, Fujiwara N, Ybanez M, Allen B, Martins S, Fiel MI, Goossens N, Chou HI, Hoshida Y, Friedman SL. A simple diet- and chemical-induced murine NASH model with rapid progression of steatohepatitis, fibrosis and liver cancer. J Hepatol 2018; 69:385-395. [PMID: 29572095 PMCID: PMC6054570 DOI: 10.1016/j.jhep.2018.03.011] [Citation(s) in RCA: 314] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 02/28/2018] [Accepted: 03/09/2018] [Indexed: 02/09/2023]
Abstract
BACKGROUND AND AIMS Although the majority of patients with non-alcoholic fatty liver disease (NAFLD) have only steatosis without progression, a sizeable fraction develop non-alcoholic steatohepatitis (NASH), which can lead to cirrhosis and hepatocellular carcinoma (HCC). Many established diet-induced mouse models for NASH require 24-52 weeks, which makes testing for drug response costly and time consuming. METHODS We have sought to establish a murine NASH model with rapid progression of extensive fibrosis and HCC by using a western diet (WD), which is high-fat, high-fructose and high-cholesterol, combined with low weekly dose of intraperitoneal carbon tetrachloride (CCl4), which serves as an accelerator. RESULTS C57BL/6J mice were fed a normal chow diet ± CCl4 or WD ± CCl4 for 12 and 24 weeks. Addition of CCl4 exacerbated histological features of NASH, fibrosis, and tumor development induced by WD, which resulted in stage 3 fibrosis at 12 weeks and HCC development at 24 weeks. Furthermore, whole liver transcriptomic analysis indicated that dysregulated molecular pathways in WD/CCl4 mice and immunologic features were similar to those of human NASH. CONCLUSIONS Our mouse NASH model exhibits rapid progression of advanced fibrosis and HCC, and mimics histological, immunological and transcriptomic features of human NASH, suggesting that it will be a useful experimental tool for preclinical drug testing. LAY SUMMARY A carefully characterized model has been developed in mice that recapitulates the progressive stages of human fatty liver disease, from simple steatosis, to inflammation, fibrosis and cancer. The functional pathways of gene expression and immune abnormalities in this model closely resemble human disease. The ease and reproducibility of this model make it ideal to study disease pathogenesis and test new treatments.
Collapse
Affiliation(s)
- Takuma Tsuchida
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA; Research Division, Mitsubishi Tanabe Pharma Corporation, Saitama, Japan
| | - Youngmin A Lee
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Naoto Fujiwara
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Maria Ybanez
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Brittany Allen
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Sebastiao Martins
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA; Departamento de Patologia, Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, SP, Brazil
| | - M Isabel Fiel
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Nicolas Goossens
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Hsin-I Chou
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Yujin Hoshida
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Scott L Friedman
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA.
| |
Collapse
|
12
|
McDyre BC, AbdulHameed MDM, Permenter MG, Dennis WE, Baer CE, Koontz JM, Boyle MH, Wallqvist A, Lewis JA, Ippolito DL. Comparative Proteomic Analysis of Liver Steatosis and Fibrosis after Oral Hepatotoxicant Administration in Sprague-Dawley Rats. Toxicol Pathol 2018; 46:202-223. [PMID: 29378501 DOI: 10.1177/0192623317747549] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The past decade has seen an increase in the development and clinical use of biomarkers associated with histological features of liver disease. Here, we conduct a comparative histological and global proteomics analysis to identify coregulated modules of proteins in the progression of hepatic steatosis or fibrosis. We orally administered the reference chemicals bromobenzene (BB) or 4,4'-methylenedianiline (4,4'-MDA) to male Sprague-Dawley rats for either 1 single administration or 5 consecutive daily doses. Livers were preserved for histopathology and global proteomics assessment. Analysis of liver sections confirmed a dose- and time-dependent increase in frequency and severity of histopathological features indicative of lipid accumulation after BB or fibrosis after 4,4'-MDA. BB administration resulted in a dose-dependent increase in the frequency and severity of inflammation and vacuolation. 4,4'-MDA administration resulted in a dose-dependent increase in the frequency and severity of periportal collagen accumulation and inflammation. Pathway analysis identified a time-dependent enrichment of biological processes associated with steatogenic or fibrogenic initiating events, cellular functions, and toxicological states. Differentially expressed protein modules were consistent with the observed histology, placing physiologically linked protein networks into context of the disease process. This study demonstrates the potential for protein modules to provide mechanistic links between initiating events and histopathological outcomes.
Collapse
Affiliation(s)
- B Claire McDyre
- 1 Oak Ridge Institute for Science and Education (ORISE), Frederick, Maryland, USA
| | - Mohamed Diwan M AbdulHameed
- 2 Department of Defense Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, U.S. Army Medical Research and Materiel Command, Fort Detrick, Maryland, USA
| | | | - William E Dennis
- 4 U.S. Army Center for Environmental Health Research (USACEHR), Fort Detrick, Maryland, USA
| | | | - Jason M Koontz
- 4 U.S. Army Center for Environmental Health Research (USACEHR), Fort Detrick, Maryland, USA
| | | | - Anders Wallqvist
- 2 Department of Defense Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, U.S. Army Medical Research and Materiel Command, Fort Detrick, Maryland, USA
| | - John A Lewis
- 4 U.S. Army Center for Environmental Health Research (USACEHR), Fort Detrick, Maryland, USA
| | - Danielle L Ippolito
- 4 U.S. Army Center for Environmental Health Research (USACEHR), Fort Detrick, Maryland, USA
| |
Collapse
|
13
|
Wang W, Zhao J, Gui W, Sun D, Dai H, Xiao L, Chu H, Du F, Zhu Q, Schnabl B, Huang K, Yang L, Hou X. Tauroursodeoxycholic acid inhibits intestinal inflammation and barrier disruption in mice with non-alcoholic fatty liver disease. Br J Pharmacol 2018; 175:469-484. [PMID: 29139555 DOI: 10.1111/bph.14095] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 10/08/2017] [Accepted: 10/31/2017] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND AND PURPOSE The gut-liver axis is associated with the progression of non-alcoholic fatty liver disease (NAFLD). Targeting the gut-liver axis and bile acid-based pharmaceuticals are potential therapies for NAFLD. The effect of tauroursodeoxycholic acid (TUDCA), a candidate drug for NAFLD, on intestinal barrier function, intestinal inflammation, gut lipid transport and microbiota composition was analysed in a murine model of NAFLD. EXPERIMENTAL APPROACH The NAFLD mouse model was established by feeding mice a high-fat diet (HFD) for 16 weeks. TUDCA was administered p.o. during the last 4 weeks. The expression levels of intestinal tight junction genes, lipid metabolic and inflammatory genes were determined by quantitative PCR. Tissue inflammation was evaluated by haematoxylin and eosin staining. The gut microbiota was analysed by 16S rRNA gene sequencing. KEY RESULTS TUDCA administration attenuated HFD-induced hepatic steatosis, inflammatory responses, obesity and insulin resistance in mice. Moreover, TUDCA attenuated gut inflammatory responses as manifested by decreased intestinal histopathology scores and inflammatory cytokine levels. In addition, TUDCA improved intestinal barrier function by increasing levels of tight junction molecules and the solid chemical barrier. The components involved in ileum lipid transport were also reduced by TUDCA administration in HFD-fed mice. Finally, the TUDCA-treated mice showed a different gut microbiota composition compared with that in HFD-fed mice but similar to that in normal chow diet-fed mice. CONCLUSIONS AND IMPLICATIONS TUDCA attenuates the progression of HFD-induced NAFLD in mice by ameliorating gut inflammation, improving intestinal barrier function, decreasing intestinal fat transport and modulating intestinal microbiota composition.
Collapse
Affiliation(s)
- Weijun Wang
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jinfang Zhao
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wenfang Gui
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Dan Sun
- Division of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Haijiang Dai
- Center of Clinical Pharmacology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Li Xiao
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Huikuan Chu
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fan Du
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | | | - Bernd Schnabl
- Department of Medicine, Biomedical Research Facility 2 (BRF2), University of California, San Diego, La Jolla, CA, USA
| | - Kai Huang
- Division of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ling Yang
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaohua Hou
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| |
Collapse
|
14
|
Vettorazzi JF, Kurauti MA, Soares GM, Borck PC, Ferreira SM, Branco RCS, Michelone LDSL, Boschero AC, Junior JMC, Carneiro EM. Bile acid TUDCA improves insulin clearance by increasing the expression of insulin-degrading enzyme in the liver of obese mice. Sci Rep 2017; 7:14876. [PMID: 29093479 PMCID: PMC5665899 DOI: 10.1038/s41598-017-13974-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 10/03/2017] [Indexed: 02/06/2023] Open
Abstract
Disruption of insulin secretion and clearance both contribute to obesity-induced hyperinsulinemia, though reduced insulin clearance seems to be the main factor. The liver is the major site for insulin degradation, a process mainly coordinated by the insulin-degrading enzyme (IDE). The beneficial effects of taurine conjugated bile acid (TUDCA) on insulin secretion as well as insulin sensitivity have been recently described. However, the possible role of TUDCA in insulin clearance had not yet been explored. Here, we demonstrated that 15 days treatment with TUDCA reestablished plasma insulin to physiological concentrations in high fat diet (HFD) mice, a phenomenon associated with increased insulin clearance and liver IDE expression. TUDCA also increased IDE expression in human hepatic cell line HepG2. This effect was not observed in the presence of an inhibitor of the hepatic membrane bile acid receptor, S1PR2, nor when its downstream proteins were inhibited, including IR, PI3K and Akt. These results indicate that treatment with TUDCA may be helpful to counteract obesity-induced hyperinsulinemia through increasing insulin clearance, likely through enhanced liver IDE expression in a mechanism dependent on S1PR2-Insulin pathway activation.
Collapse
Affiliation(s)
- Jean Franciesco Vettorazzi
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Mirian Ayumi Kurauti
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Gabriela Moreira Soares
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Patricia Cristine Borck
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Sandra Mara Ferreira
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Renato Chaves Souto Branco
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Luciana de Souza Lima Michelone
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Antonio Carlos Boschero
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Jose Maria Costa Junior
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Everardo Magalhães Carneiro
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970, Campinas, SP, Brazil.
| |
Collapse
|
15
|
Kim BJ, Arai Y, Park EM, Park S, Bello A, Han IB, Lee SH. Osteogenic Potential of Tauroursodeoxycholic Acid as an Alternative to rhBMP-2 in a Mouse Spinal Fusion Model. Tissue Eng Part A 2017; 24:407-417. [PMID: 28826347 DOI: 10.1089/ten.tea.2016.0349] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The non-union rate after lumbar spinal fusion is potentially as high as 48%. To support efficient bone regeneration, recombinant human bone morphogenetic protein-2 (rhBMP-2) is commonly used as it is regarded as the most potent bone-inducing molecule. However, recently, there have been increasing concerns on the use of rhBMP-2 such as serious complications, including seroma and heterotopic ossification, and the low quality of bone at the center of fusion mass. Thus, many studies were conducted to find and to develop a potential alternative to rhBMP-2. In this study, we investigated the osteogenic potential of tauroursodeoxycholic acid (TUDCA) in the mouse fusion model and compared its effects with rhBMP-2. Twenty-four mice underwent bilateral posterolateral lumbar spinal fusion bone formation at L4-L5. Collagen sponge infused with saline, TUDCA, or rhBMP-2 was implanted at the fusion area. Two and 4 weeks postimplantation, bone formation and tissue regeneration were evaluated via micro-computed tomography and histological analysis. Compared with the TUDCA-treated group, the rhBMP-2 treatment produced a higher amount of bone fusion formation after 2 weeks but also showed higher resorption of the centralized bone after 4 weeks. Interestingly, the TUDCA-treated group developed higher trabecular thickness compared with rhBMP-2 after 4 weeks. Moreover, TUDCA treatment showed distinct angiogenic activity in human umbilical vein endothelial cells as confirmed by an in vitro tube formation assay. Our findings suggest that TUDCA is comparable to rhBMP-2 in supporting bone regeneration and spinal bone formation fusion by increasing trabecular thickness and promoting angiogenesis. Finally, our results indicate that TUDCA can be utilized as a potential alternative to rhBMP-2.
Collapse
Affiliation(s)
- Byoung Ju Kim
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| | - Yoshie Arai
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| | - Eun-Mi Park
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| | - Sunghyun Park
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| | - Alvin Bello
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| | - In-Bo Han
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea.,2 Department of Neurosurgery, CHA Bundang Medical Center, CHA University , Seongnam-si, Korea
| | - Soo-Hong Lee
- 1 Department of Biomedical Science, College of Life Science, CHA University , Seongnam-si, Korea
| |
Collapse
|
16
|
Chow MD, Lee YH, Guo GL. The role of bile acids in nonalcoholic fatty liver disease and nonalcoholic steatohepatitis. Mol Aspects Med 2017; 56:34-44. [PMID: 28442273 DOI: 10.1016/j.mam.2017.04.004] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 04/11/2017] [Accepted: 04/20/2017] [Indexed: 12/14/2022]
Abstract
Nonalcoholic fatty liver disease is growing in prevalence worldwide. It is marked by the presence of macrosteatosis on liver histology but is often clinically asymptomatic. However, it can progress into nonalcoholic steatohepatitis which is a more severe form of liver disease characterized by inflammation and fibrosis. Further progression leads to cirrhosis, which predisposes patients to hepatocellular carcinoma or liver failure. The mechanism by which simple steatosis progresses to steatohepatitis is not entirely clear. However, multiple pathways have been proposed. A common link amongst many of these pathways is disruption of the homeostasis of bile acids. Other than aiding in the absorption of lipids and lipid-soluble vitamins, bile acids act as ligands. For example, they bind to farnesoid X receptor, which is critically involved in many of the pathways responsible for maintaining bile acid, glucose, and lipid homeostasis. Alterations to these pathways can lead to dysregulation of energy balance and increased inflammation and fibrosis. Repeated insults over time may be the key to development of steatohepatitis. For this reason, current drug therapies target aspects of these pathways to try to reduce and halt inflammation and fibrosis. This review will focus on the role of bile acids in these various pathways and how changes in these pathways may result in steatohepatitis. While there is no approved pharmaceutical treatment for either hepatic steatosis or steatohepatitis, this review will also touch upon the multitude of potential therapies.
Collapse
Affiliation(s)
- Monica D Chow
- Department of Surgery, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Yi-Horng Lee
- Division of Pediatric Surgery, Department of Surgery, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Grace L Guo
- Department of Pharmacy and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ, USA.
| |
Collapse
|
17
|
Gogiashvili M, Edlund K, Gianmoena K, Marchan R, Brik A, Andersson JT, Lambert J, Madjar K, Hellwig B, Rahnenführer J, Hengstler JG, Hergenröder R, Cadenas C. Metabolic profiling of ob/ob mouse fatty liver using HR-MAS 1H-NMR combined with gene expression analysis reveals alterations in betaine metabolism and the transsulfuration pathway. Anal Bioanal Chem 2016; 409:1591-1606. [PMID: 27896396 DOI: 10.1007/s00216-016-0100-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/21/2016] [Accepted: 11/14/2016] [Indexed: 02/07/2023]
Abstract
Metabolic perturbations resulting from excessive hepatic fat accumulation are poorly understood. Thus, in this study, leptin-deficient ob/ob mice, a mouse model of fatty liver disease, were used to investigate metabolic alterations in more detail. Metabolites were quantified in intact liver tissues of ob/ob (n = 8) and control (n = 8) mice using high-resolution magic angle spinning (HR-MAS) 1H-NMR. In addition, after demonstrating that HR-MAS 1H-NMR does not affect RNA integrity, transcriptional changes were measured by quantitative real-time PCR on RNA extracted from the same specimens after HR-MAS 1H-NMR measurements. Importantly, the gene expression changes obtained agreed with those observed by Affymetrix microarray analysis performed on RNA isolated directly from fresh-frozen tissue. In total, 40 metabolites could be assigned in the spectra and subsequently quantified. Quantification of lactate was also possible after applying a lactate-editing pulse sequence that suppresses the lipid signal, which superimposes the lactate methyl resonance at 1.3 ppm. Significant differences were detected for creatinine, glutamate, glycine, glycolate, trimethylamine-N-oxide, dimethylglycine, ADP, AMP, betaine, phenylalanine, and uridine. Furthermore, alterations in one-carbon metabolism, supported by both metabolic and transcriptional changes, were observed. These included reduced demethylation of betaine to dimethylglycine and the reduced expression of genes coding for transsulfuration pathway enzymes, which appears to preserve methionine levels, but may limit glutathione synthesis. Overall, the combined approach is advantageous as it identifies changes not only at the single gene or metabolite level but also deregulated pathways, thus providing critical insight into changes accompanying fatty liver disease. Graphical abstract A Evaluation of RNA integrity before and after HR-MAS 1H-NMR of intact mouse liver tissue. B Metabolite concentrations and gene expression levels assessed in ob/ob (steatotic) and ob/+ (control) mice using HR-MAS 1H-NMR and qRT-PCR, respectively.
Collapse
Affiliation(s)
- Mikheil Gogiashvili
- Leibniz Institut für Analytische Wissenschaften - ISAS e.V., Bunsen-Kirchhoff-Strasse 11, 44139, Dortmund, Germany.
| | - Karolina Edlund
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Kathrin Gianmoena
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Rosemarie Marchan
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Alexander Brik
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance (IPA), Institute of the Ruhr-Universität Bochum, Bürkle-de-la-Camp-Platz 1, 44789, Bochum, Germany
| | - Jan T Andersson
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstrasse 30, 48149, Münster, Germany
| | - Jörg Lambert
- Leibniz Institut für Analytische Wissenschaften - ISAS e.V., Bunsen-Kirchhoff-Strasse 11, 44139, Dortmund, Germany
| | - Katrin Madjar
- Faculty of Statistics, TU Dortmund University, Mathematics Building, 44221, Dortmund, Germany
| | - Birte Hellwig
- Faculty of Statistics, TU Dortmund University, Mathematics Building, 44221, Dortmund, Germany
| | - Jörg Rahnenführer
- Faculty of Statistics, TU Dortmund University, Mathematics Building, 44221, Dortmund, Germany
| | - Jan G Hengstler
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Roland Hergenröder
- Leibniz Institut für Analytische Wissenschaften - ISAS e.V., Bunsen-Kirchhoff-Strasse 11, 44139, Dortmund, Germany
| | - Cristina Cadenas
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| |
Collapse
|
18
|
Park MY, Kim S, Ko E, Ahn SH, Seo H, Sung MK. Gut microbiota-associated bile acid deconjugation accelerates hepatic steatosis in ob/ob mice. J Appl Microbiol 2016; 121:800-10. [DOI: 10.1111/jam.13158] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 04/14/2016] [Accepted: 04/21/2016] [Indexed: 12/19/2022]
Affiliation(s)
- M.-Y. Park
- Department of Food and Nutrition Education; Graduate School of Education; Soonchunhyang University; Asan Chungnam Korea
| | - S.J. Kim
- Department of Food and Nutrition; Sookmyung Women's University; Seoul Korea
| | - E.K. Ko
- Department of Food and Nutrition; Sookmyung Women's University; Seoul Korea
| | - S.-H. Ahn
- Collage of Pharmacy; Kangwon National University; Chuncheon Korea
| | - H. Seo
- Department of Drug Discovery Platform Technology; Korea Research Institute of Chemical Technology; Daejeon Korea
| | - M.-K. Sung
- Department of Food and Nutrition; Sookmyung Women's University; Seoul Korea
| |
Collapse
|
19
|
Ertunc ME, Hotamisligil GS. Lipid signaling and lipotoxicity in metaflammation: indications for metabolic disease pathogenesis and treatment. J Lipid Res 2016; 57:2099-2114. [PMID: 27330055 DOI: 10.1194/jlr.r066514] [Citation(s) in RCA: 303] [Impact Index Per Article: 37.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 06/20/2016] [Indexed: 12/19/2022] Open
Abstract
Lipids encompass a wide variety of molecules such as fatty acids, sterols, phospholipids, and triglycerides. These molecules represent a highly efficient energy resource and can act as structural elements of membranes or as signaling molecules that regulate metabolic homeostasis through many mechanisms. Cells possess an integrated set of response systems to adapt to stresses such as those imposed by nutrient fluctuations during feeding-fasting cycles. While lipids are pivotal for these homeostatic processes, they can also contribute to detrimental metabolic outcomes. When metabolic stress becomes chronic and adaptive mechanisms are overwhelmed, as occurs during prolonged nutrient excess or obesity, lipid influx can exceed the adipose tissue storage capacity and result in accumulation of harmful lipid species at ectopic sites such as liver and muscle. As lipid metabolism and immune responses are highly integrated, accumulation of harmful lipids or generation of signaling intermediates can interfere with immune regulation in multiple tissues, causing a vicious cycle of immune-metabolic dysregulation. In this review, we summarize the role of lipotoxicity in metaflammation at the molecular and tissue level, describe the significance of anti-inflammatory lipids in metabolic homeostasis, and discuss the potential of therapeutic approaches targeting pathways at the intersection of lipid metabolism and immune function.
Collapse
Affiliation(s)
- Meric Erikci Ertunc
- Department of Genetics and Complex Diseases and Sabri Ülker Center, Harvard T. H. Chan School of Public Health, Broad Institute of Harvard and Massachusetts Institute of Technology, Boston, MA 02115
| | - Gökhan S Hotamisligil
- Department of Genetics and Complex Diseases and Sabri Ülker Center, Harvard T. H. Chan School of Public Health, Broad Institute of Harvard and Massachusetts Institute of Technology, Boston, MA 02115
| |
Collapse
|
20
|
Coughlan R, Cameron S. Key data from the 17th International Workshop on Co-morbidities and Adverse Drug Reactions in HIV. Antivir Ther 2016; 21:75-89. [PMID: 26857256 DOI: 10.3851/imp3031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2016] [Indexed: 10/22/2022]
Abstract
Combination antiretroviral therapy (cART) has significantly reduced HIV-related morbidity and mortality; however, residual inflammation often persists in the absence of detectable viral load. In addition, chronic use of cART and an ageing HIV-positive population present new challenges to treating physicians who must balance the need for good virological control with risk of treatment-related toxicities. Discussions at the 17th International Workshop on Co-morbidities and Adverse Drug Reactions in HIV once again sought a better understanding of the complex relationship between HIV-, treatment- and age-related factors in the development of comorbidities in those infected with HIV. Key data from the meeting pertaining to inflammatory pathways in HIV, adipose tissue metabolism, cardiovascular disease, bone health, ageing and frailty, neurocognitive dysfunction, pulmonary disease and HCV coinfection are the focus of this report.
Collapse
|
21
|
Gao F, Zhang X, Zhou L, Zhou S, Zheng Y, Yu J, Fan W, Zhu Y, Han X. Type 2 diabetes mitigation in the diabetic Goto-Kakizaki rat by elevated bile acids following a common-bile-duct surgery. Metabolism 2016; 65:78-88. [PMID: 26773931 DOI: 10.1016/j.metabol.2015.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 09/10/2015] [Accepted: 09/19/2015] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Elevated plasma bile acids after bariatric surgery are thought to explain type 2 diabetes mellitus (T2DM) remission. Bile acids can bind to and activate the nuclear receptor farnesoid-X receptor (FXR) by regulating lipid and glucose metabolism. We performed a surgical procedure (ligation of the common bile duct and external biliary drainage [LBD]) in the diabetic Goto-Kakizaki (GK) rat in order to investigate its effect on bile acids metabolism and T2DM mitigation. MATERIAL/METHODS LBD surgery and sham control surgery were performed on diabetic GK rats. The concentrations of total bile acids and blood glucose were analyzed by an automatic analyzer. Intraperitoneal glucose tolerance test (IPGTT) and insulin tolerance test (ITT) were used to monitor blood glucose level. Expression of genes involved in bile acid metabolism (FXR, CYP7A, et al.) and glycolipid metabolism (G6Pase, PEPCK, et al) was analyzed using qRT-PCR. The protein levels of pAKT, AKT and pGSK3β were tested by western blot. The morphological alterations of the liver and epididymal fat were monitored by H&E staining. RESULTS LBD increased plasma total bile acids, improved hepatic insulin sensitivity, and eventually mitigated T2DM, whereas food intake and body weight were unaltered. Post-LBD, the levels of total bile acids were elevated from 24.80±7.12 to 61.44±6.40 and the concentration of fast blood glucose was decreased from 204.7±11.06mg/dL to 109.3±5.4mg/dL. IPGTT and ITT showed that LBD operation improved insulin sensitivity in GK rats. Clusters of FXR signaling target genes were altered in the liver, such as FXR, CYP7A, G6Pase and PEPCK. These contributed to sustained bile acid homeostasis, and they ameliorated hepatic endoplasmic reticulum (ER) stress, increased energy expenditure, and reduced gluconeogenesis, resulting in a substantial improvement in hepatic insulin sensitivity. LBD also significantly reduced epididymal fat tissue and decreased the size of adipocytes. CONCLUSION These results demonstrate that the elevated bile acids observed in LBD-operated GK rats link insulin sensitivity improvement to T2DM mitigation, recapitulating the metabolic effects of bariatric surgery. Our investigation establishes a model for a focused study of bile acids in the context of bariatric surgery that may contribute to the identification of therapeutics for T2DM.
Collapse
Affiliation(s)
- Feng Gao
- Department of Orthopedic Surgery, the First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Xu Zhang
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Jiangsu Diabetes Center, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Lanlan Zhou
- Department of rheumatism, the First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Shixiang Zhou
- Department of Orthopedic Surgery, the First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yue Zheng
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Jiangsu Diabetes Center, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Jiani Yu
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Jiangsu Diabetes Center, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Weimin Fan
- Department of Orthopedic Surgery, the First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yunxia Zhu
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Jiangsu Diabetes Center, Nanjing Medical University, Nanjing, Jiangsu, China.
| | - Xiao Han
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Jiangsu Diabetes Center, Nanjing Medical University, Nanjing, Jiangsu, China.
| |
Collapse
|
22
|
Cho JG, Lee JH, Hong SH, Lee HN, Kim CM, Kim SY, Yoon KJ, Oh BJ, Kim JH, Jung SY, Asahara T, Kwon SM, Park SG. Tauroursodeoxycholic acid, a bile acid, promotes blood vessel repair by recruiting vasculogenic progenitor cells. Stem Cells 2015; 33:792-805. [PMID: 25407160 DOI: 10.1002/stem.1901] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/22/2014] [Accepted: 10/26/2014] [Indexed: 01/19/2023]
Abstract
Although serum bile acid concentrations are approximately 10 µM in healthy subjects, the crosstalk between the biliary system and vascular repair has never been investigated. In this study, tauroursodeoxycholic acid (TUDCA) induced dissociation of CD34(+) hematopoietic stem cells (HSCs) from stromal cells by reducing adhesion molecule expression. TUDCA increased CD34(+) /Sca1(+) progenitors in mice peripheral blood (PB), and CD34(+) , CD31(+) , and c-kit(+) progenitors in human PB. In addition, TUDCA increased differentiation of CD34(+) HSCs into EPC lineage cells via Akt activation. EPC invasion was increased by TUDCA, which was mediated by fibroblast activating protein via Akt activation. Interestingly, TUDCA induced integration of EPCs into human aortic endothelial cells (HAECs) by increasing adhesion molecule expression. In the mouse hind limb ischemia model, TUDCA promoted blood perfusion by enhancing angiogenesis through recruitment of Flk-1(+) /CD34(+) and Sca-1(+) /c-kit(+) progenitors into damaged tissue. In GFP(+) bone marrow-transplanted hind limb ischemia, TUDCA induced recruitment of GFP(+) /c-kit(+) progenitors to the ischemic area, resulting in an increased blood perfusion ratio. Histological analysis suggested that GFP(+) progenitors mobilized from bone marrow, integrated into blood vessels, and differentiated into VEGFR(+) cells. In addition, TUDCA decreased cellular senescence by reducing levels of p53, p21, and reactive oxygen species and increased nitric oxide. Transplantation of TUDCA-primed senescent EPCs in hind limb ischemia significantly improved blood vessel regeneration, as compared with senescent EPCs. Our results suggested that TUDCA promoted neovascularization by enhancing the mobilization of stem/progenitor cells from bone marrow, their differentiation into EPCs, and their integration with preexisting endothelial cells.
Collapse
Affiliation(s)
- Jin Gu Cho
- Department of Biomedical Science, CHA University, Sungnamsi, Gyunggido, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Stoianov AM, Robson DL, Hetherington AM, Sawyez CG, Borradaile NM. Elongation Factor 1A-1 Is a Mediator of Hepatocyte Lipotoxicity Partly through Its Canonical Function in Protein Synthesis. PLoS One 2015; 10:e0131269. [PMID: 26102086 PMCID: PMC4478042 DOI: 10.1371/journal.pone.0131269] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 06/01/2015] [Indexed: 01/22/2023] Open
Abstract
Elongation factor 1A-1 (eEF1A-1) has non-canonical functions in regulation of the actin cytoskeleton and apoptosis. It was previously identified through a promoter-trap screen as a mediator of fatty acid-induced cell death (lipotoxicity), and was found to participate in this process downstream of ER stress. Since ER stress is implicated in the pathogenesis of nonalcoholic fatty liver disease (NAFLD), we investigated the mechanism of action of eEF1A-1 in hepatocyte lipotoxicity. HepG2 cells were exposed to excess fatty acids, followed by assessments of ER stress, subcellular localization of eEF1A-1, and cell death. A specific inhibitor of eEF1A-1 elongation activity, didemnin B, was used to determine whether its function in protein synthesis is involved in lipotoxicity. Within 6 h, eEF1A-1 protein was modestly induced by high palmitate, and partially re-localized from its predominant location at the ER to polymerized actin at the cell periphery. This early induction and subcellular redistribution of eEF1A-1 coincided with the onset of ER stress, and was later followed by cell death. Didemnin B did not prevent the initiation of ER stress by high palmitate, as indicated by eIF2α phosphorylation. However, consistent with sustained inhibition of eEF1A-1-dependent elongation activity, didemnin B prevented the recovery of protein synthesis and increase in GRP78 protein that are normally associated with later phases of the response to ongoing ER stress. This resulted in decreased palmitate-induced cell death. Our data implicate eEF1A-1, and its function in protein synthesis, in hepatocyte lipotoxicity.
Collapse
Affiliation(s)
- Alexandra M. Stoianov
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada, N6A 5C1
| | - Debra L. Robson
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada, N6A 5C1
| | - Alexandra M. Hetherington
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada, N6A 5C1
| | - Cynthia G. Sawyez
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada, N6A 5C1
- Department of Medicine, Western University, London, ON, Canada, N6A 5C1
- Robarts Research Institute, Western University, London, ON, Canada, N6A 5C1
| | - Nica M. Borradaile
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada, N6A 5C1
- * E-mail:
| |
Collapse
|
24
|
Nakamura T, Kunz RC, Zhang C, Kimura T, Yuan CL, Baccaro B, Namiki Y, Gygi SP, Hotamisligil GS. A critical role for PKR complexes with TRBP in Immunometabolic regulation and eIF2α phosphorylation in obesity. Cell Rep 2015; 11:295-307. [PMID: 25843719 DOI: 10.1016/j.celrep.2015.03.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 01/14/2015] [Accepted: 03/07/2015] [Indexed: 01/09/2023] Open
Abstract
Aberrant stress and inflammatory responses are key factors in the pathogenesis of obesity and metabolic dysfunction, and the double-stranded RNA-dependent kinase (PKR) has been proposed to play an important role in integrating these pathways. Here, we report the formation of a complex between PKR and TAR RNA-binding protein (TRBP) during metabolic and obesity-induced stress, which is critical for the regulation of eukaryotic translation initiation factor 2 alpha (eIF2α) phosphorylation and c-Jun N-terminal kinase (JNK) activation. We show that TRBP phosphorylation is induced in the setting of metabolic stress, leading to PKR activation. Suppression of hepatic TRBP reduced inflammation, JNK activity, and eIF2α phosphorylation and improved systemic insulin resistance and glucose metabolism, while TRBP overexpression exacerbated the impairment in glucose homeostasis in obese mice. These data indicate that the association between PKR and TRBP integrates metabolism with translational control and inflammatory signaling and plays important roles in metabolic homeostasis and disease.
Collapse
Affiliation(s)
- Takahisa Nakamura
- Department of Genetics and Complex Diseases and Sabri Ülker Center, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA; Division of Endocrinology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Division of Developmental Biology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
| | - Ryan C Kunz
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Cai Zhang
- Division of Endocrinology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Taishi Kimura
- Division of Endocrinology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Celvie L Yuan
- Division of Endocrinology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Brenna Baccaro
- Department of Genetics and Complex Diseases and Sabri Ülker Center, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Yuka Namiki
- Biomedicinal Information Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo 135-0063, Japan
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Gökhan S Hotamisligil
- Department of Genetics and Complex Diseases and Sabri Ülker Center, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA; Harvard-MIT Broad Institute, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA.
| |
Collapse
|
25
|
Kohli R, Myronovych A, Tan BK, Salazar-Gonzalez RM, Miles L, Zhang W, Oehrle M, Sandoval DA, Ryan KK, Seeley RJ, Setchell KD. Bile Acid Signaling: Mechanism for Bariatric Surgery, Cure for NASH? Dig Dis 2015; 33:440-6. [PMID: 26045281 PMCID: PMC6062006 DOI: 10.1159/000371699] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Bariatric surgery is the most effective and durable treatment option for obesity today. More importantly, beyond weight loss, bariatric procedures have many advantageous metabolic effects including reversal of obesity-related liver disease--nonalcoholic steatohepatitis (NASH). NASH is an important comorbidity of obesity given that it is a precursor to the development of liver cirrhosis that may necessitate liver transplantation in the long run. Simultaneously, we and others have observed increased serum bile acids in humans and animals that undergo bariatric surgery. Specifically, our preclinical studies have included experimental procedures such as 'ileal transposition' or bile diversion and established procedures such as Roux-en-Y gastric bypass and the adjustable gastric band. Importantly, these effects are not simply the result of weight loss since our data show that the resolution of NASH and increase in serum bile acids are not seen in rodents that lose an equivalent amount of weight via food restriction. In particular, we have studied the role of altered bile acid signaling, in the potent impact of a bariatric procedure termed 'vertical sleeve gastrectomy' (VSG). In this review we focus on the mechanisms of NASH resolution and weight loss after VSG surgery. We highlight the fact that bariatric surgeries can be used as 'laboratories' to dissect the mechanisms by which these procedures work to improve obesity and fatty liver disease. We describe key bile acid signaling elements that may provide potential therapeutic targets for 'bariatric-mimetic technologies' that could produce benefits similar to bariatric surgery--but without the surgery!
Collapse
Affiliation(s)
- Rohit Kohli
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA,Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Andriy Myronovych
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA,Department of Surgery, University of Michigan, Ann Arbor, Mich., USA
| | - Brandon K. Tan
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA,Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Rosa-Maria Salazar-Gonzalez
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA,Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Lili Miles
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Wujuan Zhang
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Melissa Oehrle
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | | | - Karen K. Ryan
- Department of Neurobiology, Physiology and Behavior, University of California Davis, Davis, Calif., USA
| | - Randy J. Seeley
- Department of Surgery, University of Michigan, Ann Arbor, Mich., USA
| | - Kenneth D.R. Setchell
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| |
Collapse
|
26
|
Choi YJ, Shin HS, Choi HS, Park JW, Jo I, Oh ES, Lee KY, Lee BH, Johnson RJ, Kang DH. Uric acid induces fat accumulation via generation of endoplasmic reticulum stress and SREBP-1c activation in hepatocytes. J Transl Med 2014; 94:1114-25. [PMID: 25111690 DOI: 10.1038/labinvest.2014.98] [Citation(s) in RCA: 172] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 05/13/2014] [Accepted: 06/10/2014] [Indexed: 12/19/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is currently one of the most common types of chronic liver injury. Elevated serum uric acid is a strong predictor of the development of fatty liver as well as metabolic syndrome. Here we demonstrate that uric acid induces triglyceride accumulation by SREBP-1c activation via induction of endoplasmic reticulum (ER) stress in hepatocytes. Uric acid-induced ER stress resulted in an increase of glucose-regulated protein (GRP78/94), splicing of the X-box-binding protein-1 (XBP-1), the phosphorylation of protein kinase RNA-like ER kinase (PERK), and eukaryotic translation initiation factor-2α (eIF-2α) in cultured hepatocytes. Uric acid promoted hepatic lipogenesis through overexpression of the lipogenic enzyme, acetyl-CoA carboxylase 1 (ACC1), fatty acid synthase (FAS), and stearoyl-CoA desaturase 1 (SCD1) via activation of SREBP-1c, which was blocked by probenecid, an organic anion transport blocker in HepG2 cells and primary hepatocytes. A blocker of ER stress, tauroursodeoxycholic acid (TUDCA), and an inhibitor of SREBP-1c, metformin, blocked hepatic fat accumulation, suggesting that uric acid promoted fat synthesis in hepatocytes via ER stress-induced activation of SREBP-1c. Uric acid-induced activation of NADPH oxidase preceded ER stress, which further induced mitochondrial ROS production in hepatocytes. These studies provide new insights into the mechanisms by which uric acid stimulates fat accumulation in the liver.
Collapse
Affiliation(s)
- Yea-Jin Choi
- Department of Internal Medicine, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| | - Hyun-Soo Shin
- Department of Internal Medicine, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| | - Hack Sun Choi
- Department of Internal Medicine, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| | - Joo-Won Park
- Department of Biochemistry, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| | - Inho Jo
- Department of Molecular Medicine, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| | - Eok-Soo Oh
- Department of Life Sciences, Division of Life and Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea
| | - Kang-Yo Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Byung-Hoon Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Richard J Johnson
- The Division of Renal Diseases and Hypertension, University of Colorado Denver, Aurora, Colorado, USA
| | - Duk-Hee Kang
- Department of Internal Medicine, Ewha Womans University School of Medicine, Ewha Medical Research Center, Seoul, Republic of Korea
| |
Collapse
|
27
|
Cho EJ, Yoon JH, Kwak MS, Jang ES, Lee JH, Yu SJ, Kim YJ, Kim CY, Lee HS. Tauroursodeoxycholic acid attenuates progression of steatohepatitis in mice fed a methionine-choline-deficient diet. Dig Dis Sci 2014; 59:1461-74. [PMID: 24865256 DOI: 10.1007/s10620-014-3217-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 05/13/2014] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND AIM Endoplasmic reticulum (ER) stress has been implicated in the development of nonalcoholic steatohepatitis. A methionine-choline-deficient (MCD) diet induces robust ER stress response and steatohepatitis, but the effects of ER stress modulation on the course of steatohepatitis remain uncertain. The present study evaluated whether reducing ER stress using the chemical chaperone tauroursodeoxycholic acid (TUDCA) could limit hepatocyte lipoapoptosis and progression of MCD diet-induced steatohepatitis. METHODS HuH7 cells stably transfected with sodium taurocholate cotransporting polypeptide (HuH-Ntcp cells) and palmitate (PA) were used. Experimental steatohepatitis was induced in male C57BL/6 mice using an MCD diet, and three different doses of TUDCA (500, or 1,000 mg/kg, once daily; or 500 mg/kg twice daily) were administered by gavage from the start of the MCD diet regimen or after 4 weeks. RESULTS TUDCA reduced PA-induced ER stress as manifested by decreased eIF2α phosphorylation, XBP1 splicing and expression of BiP, ATF4, and CHOP in HuH-Ntcp cells. TUDCA also decreased PA-induced JNK phosphorylation, Puma up-regulation and Bax activation, which in turn suppressed caspase-dependent hepatocyte lipoapoptosis. Mice given TUDCA did not show a significant decrease in the intrahepatic triglyceride contents and steatosis. However, TUDCA treatment significantly reduced hepatic damage compared to controls for both early and late treatment groups. TUDCA treatment reduced the expression of ER stress markers and pro-apoptotic proteins, leading to decreased apoptosis and oxidative stress. Finally, TUDCA reduced histological fibrosis along with the down-regulation of pro-fibrotic gene expression in both early and late treatment groups. CONCLUSIONS These results show that TUDCA attenuates the progression of MCD diet-induced steatohepatitis by reducing ER stress.
Collapse
Affiliation(s)
- Eun-Ju Cho
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
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
|
29
|
Bile acid supplementation improves established liver steatosis in obese mice independently of glucagon-like peptide-1 secretion. J Physiol Biochem 2014; 70:667-74. [DOI: 10.1007/s13105-014-0336-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 04/23/2014] [Indexed: 12/17/2022]
|
30
|
Anthérieu S, Le Guillou D, Coulouarn C, Begriche K, Trak-Smayra V, Martinais S, Porceddu M, Robin MA, Fromenty B. Chronic exposure to low doses of pharmaceuticals disturbs the hepatic expression of circadian genes in lean and obese mice. Toxicol Appl Pharmacol 2014; 276:63-72. [PMID: 24525044 DOI: 10.1016/j.taap.2014.01.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 01/16/2014] [Accepted: 01/28/2014] [Indexed: 12/19/2022]
Abstract
Drinking water can be contaminated with pharmaceuticals. However, it is uncertain whether this contamination can be harmful for the liver, especially during obesity. Hence, the goal of our study was to determine whether chronic exposure to low doses of pharmaceuticals could have deleterious effects on livers of lean and obese mice. To this end, lean and ob/ob male mice were treated for 4 months with a mixture of 11 drugs provided in drinking water at concentrations ranging from 10 to 10⁶ ng/l. At the end of the treatment, some liver and plasma abnormalities were observed in ob/ob mice treated with the cocktail containing 10⁶ ng/l of each drug. For this dosage, a gene expression analysis by microarray showed altered expression of circadian genes (e.g. Bmal1, Dbp, Cry1) in lean and obese mice. RT-qPCR analyses carried out in all groups of animals confirmed that expression of 8 different circadian genes was modified in a dose-dependent manner. For some genes, a significant modification was observed for dosages as low as 10²-10³ ng/l. Drug mixture and obesity presented an additive effect on circadian gene expression. These data were validated in an independent study performed in female mice. Thus, our study showed that chronic exposure to trace pharmaceuticals disturbed hepatic expression of circadian genes, particularly in obese mice. Because some of the 11 drugs can be found in drinking water at such concentrations (e.g. acetaminophen, carbamazepine, ibuprofen) our data could be relevant in environmental toxicology, especially for obese individuals exposed to these contaminants.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Mathieu Porceddu
- Mitologics SAS, Hôpital Robert Debré, 48 Boulevard Sérurier, 75019 Paris, France
| | | | | |
Collapse
|
31
|
Sahini N, Borlak J. Recent insights into the molecular pathophysiology of lipid droplet formation in hepatocytes. Prog Lipid Res 2014; 54:86-112. [PMID: 24607340 DOI: 10.1016/j.plipres.2014.02.002] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 02/17/2014] [Accepted: 02/21/2014] [Indexed: 12/11/2022]
Abstract
Triacyglycerols are a major energy reserve of the body and are normally stored in adipose tissue as lipid droplets (LDs). The liver, however, stores energy as glycogen and digested triglycerides in the form of fatty acids. In stressed condition such as obesity, imbalanced nutrition and drug induced liver injury hepatocytes accumulate excess lipids in the form of LDs whose prolonged storage leads to disease conditions most notably non-alcoholic fatty liver disease (NAFLD). Fatty liver disease has become a major health burden with more than 90% of obese, nearly 70% of overweight and about 25% of normal weight patients being affected. Notably, research in recent years has shown LD as highly dynamic organelles for maintaining lipid homeostasis through fat storage, protein sorting and other molecular events studied in adipocytes and other cells of living organisms. This review focuses on the molecular events of LD formation in hepatocytes and the importance of cross talk between different cell types and their signalling in NAFLD as to provide a perspective on molecular mechanisms as well as possibilities for different therapeutic intervention strategies.
Collapse
Affiliation(s)
- Nishika Sahini
- Centre for Pharmacology and Toxicology, Hannover Medical School, 30625 Hannover, Germany
| | - Jürgen Borlak
- Centre for Pharmacology and Toxicology, Hannover Medical School, 30625 Hannover, Germany.
| |
Collapse
|
32
|
Myronovych A, Kirby M, Ryan KK, Zhang W, Jha P, Setchell KDR, Dexheimer PJ, Aronow B, Seeley RJ, Kohli R. Vertical sleeve gastrectomy reduces hepatic steatosis while increasing serum bile acids in a weight-loss-independent manner. Obesity (Silver Spring) 2014; 22:390-400. [PMID: 23804416 PMCID: PMC3836901 DOI: 10.1002/oby.20548] [Citation(s) in RCA: 142] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/08/2013] [Accepted: 06/03/2013] [Indexed: 12/17/2022]
Abstract
OBJECTIVE Our objective was to investigate the role of bile acids in hepatic steatosis reduction after vertical sleeve gastrectomy (VSG). DESIGN AND METHODS High fat diet (HFD)-induced obese C57Bl/6 mice were randomized to VSG, Sham operation (Sham), Sham operation with pair feeding to VSG (Sham-PF), or nonsurgical controls (Naïve). All mice were on HFD until sacrifice. Mice were observed postsurgery and data for body weight, body composition, metabolic parameters, serum bile acid level and composition were collected. Further hepatic gene expression by mRNA-seq and RT-PCR analysis was assessed. RESULTS VSG and Sham-PF mice lost equal weight postsurgery while VSG mice had the lowest hepatic triglyceride content at sacrifice. The VSG mice had elevated serum bile acid levels that positively correlated with maximal weight loss. Serum bile composition in the VSG group had increased cholic and tauroursodeoxycholic acid. These bile acid composition changes in VSG mice explained observed downregulation of hepatic lipogenic and bile acid synthetic genes. CONCLUSION VSG in obese mice results in greater hepatic steatosis reduction than seen with caloric restriction alone. VSG surgery increases serum bile acids that correlate with weight lost postsurgery and changes serum bile composition that could explain suppression of hepatic genes responsible for lipogenesis.
Collapse
Affiliation(s)
- Andriy Myronovych
- Department of Pediatrics, Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Michelle Kirby
- Department of Pediatrics, Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Karen K. Ryan
- Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Wujuan Zhang
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Pinky Jha
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Kenneth DR Setchell
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Phillip J Dexheimer
- Department of Pediatrics, Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Bruce Aronow
- Department of Pediatrics, Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Randy J Seeley
- Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Rohit Kohli
- Department of Pediatrics, Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
- Metabolic Diseases Institute, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| |
Collapse
|
33
|
Zhao J, Lawless MW. Stop feeding cancer: pro-inflammatory role of visceral adiposity in liver cancer. Cytokine 2013; 64:626-37. [PMID: 24120848 DOI: 10.1016/j.cyto.2013.09.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 08/12/2013] [Accepted: 09/06/2013] [Indexed: 02/06/2023]
Abstract
Liver cancer is the fifth most common cancer in the world with an estimated over half a million new cases diagnosed every year. Due to the difficulty in early diagnosis and lack of treatment options, the prevalence of liver cancer continues to climb with a 5-year survival rate of between 6% and 11%. Coinciding with the rise of liver cancer, the prevalence of obesity has rapidly increased over the past two decades. Evidence from epidemiological studies demonstrates a higher risk of hepatocellular carcinoma (HCC) in obese individuals. Obesity is recognised as a low-grade inflammatory disease, this is of particular relevance as inflammation has been proposed as the seventh hallmark of cancer development with abdominal visceral adiposity considered as an important source of pro-inflammatory stimuli. Emerging evidence points towards the direct role of visceral adipose tissue rather than generalised body fat in carcinogenesis. Cytokines such as IL-6 and TNF-α secreted from visceral adipose tissue have been demonstrated to induce a chronic inflammatory condition predisposing the liver to a protumourigenic milieu. This review focuses on excess visceral adiposity rather than simple obesity; particularly adipokines and their implications for chronic inflammation, lipid accumulation, insulin resistance, Endoplasmic Reticulum (ER) stress and angiogenesis. Evidence of molecular signalling pathways that may give rise to the onset and progression of HCC in this context are depicted. Delineation of the pro-inflammatory role of visceral adiposity in liver cancer and its targeting will provide better rational and therapeutic approaches for HCC prevention and elimination. The concept of a central role for metabolism in cancer is the culmination of an effort that began with one of the 20th century's leading biochemists and Nobel laureate of 1931, Otto Warburg.
Collapse
Affiliation(s)
- Jun Zhao
- Experimental Medicine, UCD School of Medicine and Medical Science, Mater Misericordiae University Hospital, Dublin 7, Ireland
| | | |
Collapse
|
34
|
García-Ruiz C, Baulies A, Mari M, García-Rovés PM, Fernandez-Checa JC. Mitochondrial dysfunction in non-alcoholic fatty liver disease and insulin resistance: Cause or consequence? Free Radic Res 2013; 47:854-68. [DOI: 10.3109/10715762.2013.830717] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
35
|
Ren LP, Song GY, Hu ZJ, Zhang M, Peng L, Chen SC, Wei L, Li F, Sun W. The chemical chaperon 4-phenylbutyric acid ameliorates hepatic steatosis through inhibition of de novo lipogenesis in high-fructose-fed rats. Int J Mol Med 2013; 32:1029-36. [PMID: 24042997 DOI: 10.3892/ijmm.2013.1493] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 08/19/2013] [Indexed: 12/15/2022] Open
Abstract
Non-alcoholic fatty liver disease caused by dietary factors such as a high fructose intake is a growing global concern. The aim of this study was to investigate the intervention effects of an endoplasmic reticulum stress (ERS) inhibitor 4-phenylbutyric acid (PBA) on liver steatosis induced by high-fructose feeding in rats and the possible underlying mechanisms. Wistar rats were divided into the control, high-fructose group (HFru) and PBA intervention (HFru-PBA) groups. PBA intervention was initiated following 4 weeks of high-fructose feeding. After 8 weeks of feeding, the ERS markers p-PERK, p-eIF2α, p-IRE-1, spliced XBP-1, ATF-6 were measured by western blotting. Liver triglyceride contents and morphological changes were examined. The protein expression of lipogenic key enzymes (ACC, FAS and SCD-1) and upstream transcriptional factors (SREBP-1c and ChREBP) were measured. The ERS-related cell events, oxidative stress and apoptosis, were evaluated by standard methods. Results demonstrated that PBA intervention significantly resolved hepatic ERS and improved liver steatosis induced by high-fructose feeding in rats. The protein expression of ACC, FAS, SCD-1 and SREBP-1c was upregulated in high-fructose-fed rats, whereas it decreased following PBA intervention. Oxidative stress and apoptosis were observed in livers of high-fructose-fed rats, but were alleviated by PBA intervention. ERS is involved in the development of fatty liver induced by a high fructose intake. ERS inhibition by PBA can therefore ameliorate liver steatosis through inhibition of hepatic lipogenesis.
Collapse
Affiliation(s)
- Lu-Ping Ren
- Department of Endocrinology, General Hospital of Hebei, Shijiazhuang, Hebei 050051, P.R. China
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Kohli R, Setchell KD, Kirby M, Myronovych A, Ryan KK, Ibrahim SH, Berger J, Smith K, Toure M, Woods SC, Seeley RJ. A surgical model in male obese rats uncovers protective effects of bile acids post-bariatric surgery. Endocrinology 2013; 154:2341-51. [PMID: 23592746 PMCID: PMC3689286 DOI: 10.1210/en.2012-2069] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Bariatric surgery elevates serum bile acids. Conjugated bile acid administration, such as tauroursodeoxycholic acid (TUDCA), improves insulin sensitivity, whereas short-circuiting bile acid circulation through ileal interposition surgery in rats raises TUDCA levels. We hypothesized that bariatric surgery outcomes could be recapitulated by short circuiting the normal enterohepatic bile circulation. We established a model wherein male obese rats underwent either bile diversion (BD) or Sham (SH) surgery. The BD group had a catheter inserted into the common bile duct and its distal end anchored into the middistal jejunum for 4-5 weeks. Glucose tolerance, insulin and glucagon-like peptide-1 (GLP-1) response, hepatic steatosis, and endoplasmic reticulum (ER) stress were measured. Rats post-BD lost significantly more weight than the SH rats. BD rats gained less fat mass after surgery. BD rats had improved glucose tolerance, increased higher postprandial glucagon-like peptide-1 response and serum bile acids but less liver steatosis. Serum bile acid levels including TUDCA concentrations were higher in BD compared to SH pair-fed rats. Fecal bile acid levels were not different. Liver ER stress (C/EBP homologous protein mRNA and pJNK protein) was decreased in BD rats. Bile acid gavage (TUDCA/ursodeoxycholic acid [UDCA]) in diet-induced obese rats, elevated serum TUDCA and concomitantly reduced hepatic steatosis and ER stress (C/EBP homologous protein mRNA). These data demonstrate the ability of alterations in bile acids to recapitulate important metabolic improvements seen after bariatric surgery. Further, our work establishes a model for focused study of bile acids in the context of bariatric surgery that may lead to the identification of therapeutics for metabolic disease.
Collapse
Affiliation(s)
- Rohit Kohli
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Lake AD, Novak P, Shipkova P, Aranibar N, Robertson D, Reily MD, Lu Z, Lehman-McKeeman LD, Cherrington NJ. Decreased hepatotoxic bile acid composition and altered synthesis in progressive human nonalcoholic fatty liver disease. Toxicol Appl Pharmacol 2013; 268:132-40. [PMID: 23391614 PMCID: PMC3627549 DOI: 10.1016/j.taap.2013.01.022] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 01/13/2013] [Accepted: 01/21/2013] [Indexed: 12/19/2022]
Abstract
Bile acids (BAs) have many physiological roles and exhibit both toxic and protective influences within the liver. Alterations in the BA profile may be the result of disease induced liver injury. Nonalcoholic fatty liver disease (NAFLD) is a prevalent form of chronic liver disease characterized by the pathophysiological progression from simple steatosis to nonalcoholic steatohepatitis (NASH). The hypothesis of this study is that the 'classical' (neutral) and 'alternative' (acidic) BA synthesis pathways are altered together with hepatic BA composition during progression of human NAFLD. This study employed the use of transcriptomic and metabolomic assays to study the hepatic toxicologic BA profile in progressive human NAFLD. Individual human liver samples diagnosed as normal, steatosis, and NASH were utilized in the assays. The transcriptomic analysis of 70 BA genes revealed an enrichment of downregulated BA metabolism and transcription factor/receptor genes in livers diagnosed as NASH. Increased mRNA expression of BAAT and CYP7B1 was observed in contrast to decreased CYP8B1 expression in NASH samples. The BA metabolomic profile of NASH livers exhibited an increase in taurine together with elevated levels of conjugated BA species, taurocholic acid (TCA) and taurodeoxycholic acid (TDCA). Conversely, cholic acid (CA) and glycodeoxycholic acid (GDCA) were decreased in NASH liver. These findings reveal a potential shift toward the alternative pathway of BA synthesis during NASH, mediated by increased mRNA and protein expression of CYP7B1. Overall, the transcriptomic changes of BA synthesis pathway enzymes together with altered hepatic BA composition signify an attempt by the liver to reduce hepatotoxicity during disease progression to NASH.
Collapse
Affiliation(s)
- April D. Lake
- University of Arizona, Department of Pharmacology and Toxicology, Tucson, Arizona 85721
| | - Petr Novak
- Biology Centre ASCR, Institute of Plant Molecular Biology, Ceske Budejovice, Czech Republic 37001
| | - Petia Shipkova
- Pharmaceutical Candidate Optimization, Bristol-Myers Squibb Co., Princeton, NJ 08543
| | - Nelly Aranibar
- Pharmaceutical Candidate Optimization, Bristol-Myers Squibb Co., Princeton, NJ 08543
| | - Donald Robertson
- Pharmaceutical Candidate Optimization, Bristol-Myers Squibb Co., Princeton, NJ 08543
| | - Michael D. Reily
- Pharmaceutical Candidate Optimization, Bristol-Myers Squibb Co., Princeton, NJ 08543
| | - Zhenqiang Lu
- The Arizona Statistical Consulting Laboratory, University of Arizona, Tucson, Arizona 85721
| | | | - Nathan J. Cherrington
- University of Arizona, Department of Pharmacology and Toxicology, Tucson, Arizona 85721
| |
Collapse
|
38
|
Potential for therapeutic manipulation of the UPR in disease. Semin Immunopathol 2013; 35:351-73. [PMID: 23572207 PMCID: PMC3641308 DOI: 10.1007/s00281-013-0370-z] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 03/13/2013] [Indexed: 12/16/2022]
Abstract
Increased endoplasmic reticulum (ER) stress and the activated unfolded protein response (UPR) signaling associated with it play key roles in physiological processes as well as under pathological conditions. The UPR normally protects cells and re-establishes cellular homeostasis, but prolonged UPR activation can lead to the development of various pathologies. These features make the UPR signaling pathway an attractive target for the treatment of diseases whose pathogenesis is characterized by chronic activation of this pathway. Here, we focus on the molecular signaling pathways of the UPR and suggest possible ways to target this response for therapeutic purposes.
Collapse
|
39
|
Halilbasic E, Claudel T, Trauner M. Bile acid transporters and regulatory nuclear receptors in the liver and beyond. J Hepatol 2013; 58:155-68. [PMID: 22885388 PMCID: PMC3526785 DOI: 10.1016/j.jhep.2012.08.002] [Citation(s) in RCA: 274] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 08/01/2012] [Accepted: 08/03/2012] [Indexed: 02/06/2023]
Abstract
Bile acid (BA) transporters are critical for maintenance of the enterohepatic BA circulation where BAs exert their multiple physiological functions including stimulation of bile flow, intestinal absorption of lipophilic nutrients, solubilization and excretion of cholesterol, as well as antimicrobial and metabolic effects. Tight regulation of BA transporters via nuclear receptors is necessary to maintain proper BA homeostasis. Hereditary and acquired defects of BA transporters are involved in the pathogenesis of several hepatobiliary disorders including cholestasis, gallstones, fatty liver disease and liver cancer, but also play a role in intestinal and metabolic disorders beyond the liver. Thus, pharmacological modification of BA transporters and their regulatory nuclear receptors opens novel treatment strategies for a wide range of disorders.
Collapse
Key Words
- bile acids, cholestasis, fatty liver disease, gallstones, liver regeneration, liver cancer
- 6-ecdca, 6-ethylchenodeoxycholic acid
- ae2, anion exchanger 2
- abcg5/8, cholesterol efflux pump, atp-binding cassette, subfamily g, member 5/8
- ba, bile acid
- ampk, amp activated protein kinase
- bcrp (abcg2), breast cancer resistance protein, atp-binding cassette, subfamily g, member 2
- bric, benign recurrent intrahepatic cholestasis
- bsep (abcb11), bile salt export pump
- car (nr1i3), constitutive androstane receptor
- egfr, epidermal growth factor receptor
- fgf15/19, fibroblast growth factor 15/19
- fxr (nr1h4), farnesoid x receptor/bile acid receptor
- glp-1, glucagon like peptide 1
- gr (nr3c1), glucocorticoid receptor
- hcc, hepatocellular carcinoma
- hnf1α, hepatocyte nuclear factor 1 alpha
- hnf4α (nr2a1), hepatocyte nuclear factor 4 alpha
- ibabp (fabp6, ilbp), intestinal bile acid-binding protein, fatty acid-binding protein 6
- icp, intrahepatic cholestasis of pregnancy
- il6, interleukin 6
- lca, lithocholic acid
- lrh-1 (nr5a2), liver receptor homolog-1
- lxrα (nr1h3), liver x receptor alpha
- mdr1 (abcb1), p-glycoprotein, atp-binding cassette, subfamily b, member 1
- mdr2/mdr3 (abcb4), multidrug resistance protein 2 (rodents)/3 (human)
- mrp2 (abcc2), multidrug resistance-associated protein 2, atp-binding cassette, subfamily c, member 2
- mrp3 (abcc3), multidrug resistance-associated protein 3, atp-binding cassette, subfamily c, member 3
- mrp4 (abcc4), multidrug resistance-associated protein 4, atp-binding cassette, subfamily c, member 4
- nafld, non-alcoholic fatty liver disease
- nash, non-alcoholic steatohepatitis
- norudca, norursodeoxycholic acid
- nr, nuclear receptor
- ntcp (slc10a1), sodium/taurocholate cotransporting polypeptide, solute carrier family 10, member 1
- oatp1a2 (slco1a2, oatp1, oatp-a, slc21a3), solute carrier organic anion transporter family, member 1a2
- oatp1b1 (slco1b1, oatp2, oatp-c, slc21a6), solute carrier organic anion transporter family, member 1b1
- oatp1b3 (slco1b3, oatp8, slc21a8), solute carrier organic anion transporter family, member 1b3
- ostαβ, organic solute transporter alpha/beta
- pbc, primary biliary cirrhosis
- pfic, progressive familial intrahepatic cholestasis
- ph, partial hepatectomy
- pparα (nr1c1), peroxisome proliferator-activated receptor alpha
- pparγ (nr1c3), peroxisome proliferator-activated receptor gamma
- psc, primary sclerosing cholangitis
- pxr (nr1i2), pregnane x receptor
- rarα (nr1b1), retinoic acid receptor alpha
- rxrα (nr2b1), retinoid x receptor alpha
- shp (nr0b2), short heterodimer partner
- src2, p160 steroid receptor coactivator
- tgr5, g protein-coupled bile acid receptor
- tnfα, tumor necrosis factor α
- tpn, total parenteral nutrition
- udca, ursodeoxycholic acid
- vdr (nr1i1), vitamin d receptor. please note that for the convenience of better readability and clarity, abbreviations for transporters and nuclear receptors were capitalized throughout this article when symbols were identical for human and rodents
Collapse
Affiliation(s)
| | | | - Michael Trauner
- Corresponding author. Address: Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Waehringer Guertel 18-20, A-1090 Vienna, Austria. Tel.: +43 01 40400 4741; fax: +43 01 40400 4735.
| |
Collapse
|
40
|
Samuel VT, Shulman GI. Mechanisms for insulin resistance: common threads and missing links. Cell 2012; 148:852-71. [PMID: 22385956 DOI: 10.1016/j.cell.2012.02.017] [Citation(s) in RCA: 1469] [Impact Index Per Article: 122.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Indexed: 02/07/2023]
Abstract
Insulin resistance is a complex metabolic disorder that defies explanation by a single etiological pathway. Accumulation of ectopic lipid metabolites, activation of the unfolded protein response (UPR) pathway, and innate immune pathways have all been implicated in the pathogenesis of insulin resistance. However, these pathways are also closely linked to changes in fatty acid uptake, lipogenesis, and energy expenditure that can impact ectopic lipid deposition. Ultimately, these cellular changes may converge to promote the accumulation of specific lipid metabolites (diacylglycerols and/or ceramides) in liver and skeletal muscle, a common final pathway leading to impaired insulin signaling and insulin resistance.
Collapse
Affiliation(s)
- Varman T Samuel
- Department of Medicine, Yale University School of Medicine, New Haven, CT 06510, USA.
| | | |
Collapse
|
41
|
Multidisciplinary pharmacotherapeutic options for nonalcoholic Fatty liver disease. Int J Hepatol 2012; 2012:950693. [PMID: 23304532 PMCID: PMC3523542 DOI: 10.1155/2012/950693] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 11/13/2012] [Indexed: 12/22/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH) are multidisciplinary liver diseases that often accompany type 2 diabetes or metabolic syndrome, which are characterized by insulin resistance. Therefore, effective treatment of type 2 diabetes and metabolic syndrome should target not only the cardiometabolic abnormalities, but also the associated liver disorders. In the last decade, it has been shown that metformin, thiazolidinediones, vitamin E, ezetimibe, n-3 polyunsaturated fatty acids, renin-angiotensin system (RAS) blockers, and antiobesity drugs may improve hepatic pathophysiological disorders as well as clinical parameters. Accordingly, insulin sensitizers, antioxidative agents, Niemann-Pick C1-like 1 (NPC1L1) inhibitors, RAS blockers, and drugs that target the central nervous system may represent candidate pharmacotherapies for NAFLD and possibly NASH. However, the efficacy, safety, and tolerability of long-term treatment (potentially for many years) with these drugs have not been fully established. Furthermore, clinical trials have not comprehensively examined the efficacy of lipid-lowering drugs (i.e., statins, fibrates, and NPC1L1 inhibitors) for the treatment of NAFLD. Although clinical evidence for RAS blockers and incretin-based agents (GLP-1 analogs and dipeptidyl peptidase-4 inhibitors) is also lacking, these agents are promising in terms of their insulin-sensitizing and anti-inflammatory effects without causing weight gain.
Collapse
|
42
|
Endoplasmic reticulum stress and lipid metabolism: mechanisms and therapeutic potential. Biochem Res Int 2011; 2012:841362. [PMID: 22195283 PMCID: PMC3238353 DOI: 10.1155/2012/841362] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Accepted: 10/18/2011] [Indexed: 12/11/2022] Open
Abstract
The endoplasmic reticulum (ER) plays a crucial role in protein folding, assembly, and secretion. Disruption of ER homeostasis may lead to accumulation of misfolded or unfolded proteins in the ER lumen, a condition referred to as ER stress. In response to ER stress, a signal transduction pathway known as the unfolded protein response (UPR) is activated. UPR activation allows the cell to cope with an increased protein-folding demand on the ER. Recent studies have shown that ER stress/UPR activation plays a critical role in lipid metabolism and homeostasis. ER-stress-dependent dysregulation of lipid metabolism may lead to dyslipidemia, insulin resistance, cardiovascular disease, type 2 diabetes, and obesity. In this paper, we examine recent findings illustrating the important role ER stress/UPR signalling pathways play in regulation of lipid metabolism, and how they may lead to dysregulation of lipid homeostasis.
Collapse
|
43
|
Kim HK, Thu VT, Heo HJ, Kim N, Han J. Cardiac proteomic responses to ischemia-reperfusion injury and ischemic preconditioning. Expert Rev Proteomics 2011; 8:241-61. [PMID: 21501017 DOI: 10.1586/epr.11.8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cardiac ischemia and ischemia-reperfusion (I/R) injury are major contributors to morbidity and mortality worldwide. Pathological mechanisms of I/R and the physiological mechanisms of ischemic preconditioning (IPC), which is an effective cardiac protective response, have been widely investigated in the last decade to search for means to prevent or treat this disease. Proteomics is a powerful analytical tool that has provided important information to identify target proteins and understand the underlying mechanisms of I/R and IPC. Here, we review the application of proteomics to I/R injury and IPC to discover target proteins. We analyze the functional meaning of the accumulated data on hundreds of proteins using various bioinformatics applications. In addition, we review exercise-induced proteomic alterations in the heart to understand the potential cardioprotective role of exercise against I/R injury. Further developments in the proteomic field that target specialized proteins will yield new insights for optimizing therapeutic targets and developing a wide range of therapeutic agents against ischemic heart disease.
Collapse
Affiliation(s)
- Hyoung Kyu Kim
- National Research Laboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Cardiovascular and Metabolic Disease Center, Inje University 633-165 Gaegeum-Dong, Busanjin-Gu, Busan 613-735, Korea
| | | | | | | | | |
Collapse
|
44
|
Jeon J, Jeong JH, Baek JH, Koo HJ, Park WH, Yang JS, Yu MH, Kim S, Pak YK. Network clustering revealed the systemic alterations of mitochondrial protein expression. PLoS Comput Biol 2011; 7:e1002093. [PMID: 21738461 PMCID: PMC3127811 DOI: 10.1371/journal.pcbi.1002093] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Accepted: 05/03/2011] [Indexed: 01/03/2023] Open
Abstract
The mitochondrial protein repertoire varies depending on the cellular state. Protein component modifications caused by mitochondrial DNA (mtDNA) depletion are related to a wide range of human diseases; however, little is known about how nuclear-encoded mitochondrial proteins (mt proteome) changes under such dysfunctional states. In this study, we investigated the systemic alterations of mtDNA-depleted (ρ0) mitochondria by using network analysis of gene expression data. By modularizing the quantified proteomics data into protein functional networks, systemic properties of mitochondrial dysfunction were analyzed. We discovered that up-regulated and down-regulated proteins were organized into two predominant subnetworks that exhibited distinct biological processes. The down-regulated network modules are involved in typical mitochondrial functions, while up-regulated proteins are responsible for mtDNA repair and regulation of mt protein expression and transport. Furthermore, comparisons of proteome and transcriptome data revealed that ρ0 cells attempted to compensate for mtDNA depletion by modulating the coordinated expression/transport of mt proteins. Our results demonstrate that mt protein composition changed to remodel the functional organization of mitochondrial protein networks in response to dysfunctional cellular states. Human mt protein functional networks provide a framework for understanding how cells respond to mitochondrial dysfunctions. Mitochondria are dynamic organelles that are essential for energy production and cellular processes in eukaryotic cells, and their functional failure is a major cause of age-associated degenerative diseases. To meet the specific needs of different cellular states, mitochondrial protein repertoires are adjusted. It is critical to characterize the systemic alterations of mitochondria to different cellular states to understand the dynamic organization of mitochondrial systems. In this study, we modularized the quantified proteomics data into protein functional networks to characterize gene expression changes under dysfunctional mitochondrial conditions. Our results demonstrate that mitochondrial protein repertoires changed to compensate for dysfunctional cellular states by reorganizing mitochondrial protein functional network. Through network clustering analysis, we discovered that cells respond to pathological conditions by modulating the coordinated expression/transport of mitochondrial proteins. Network analysis of mt proteins can advance our understanding of dysfunctional mitochondrial systems and elucidate the candidate mt proteins involved in human mitochondrial diseases.
Collapse
Affiliation(s)
- Jouhyun Jeon
- Division of Molecular and Life Science, School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Korea
| | - Jae Hoon Jeong
- Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul, Korea
| | - Je-Hyun Baek
- Functional Proteomics Center, Korea Institute of Science and Technology, Seoul, Korea
| | - Hyun-Jung Koo
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Wook-Ha Park
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Jae-Seong Yang
- Division of Molecular and Life Science, School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Korea
| | - Myeong-Hee Yu
- Functional Proteomics Center, Korea Institute of Science and Technology, Seoul, Korea
| | - Sanguk Kim
- Division of Molecular and Life Science, School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Korea
- Division of ITCE engineering, Pohang University of Science and Technology, Pohang, Korea
- * E-mail: (SK); (YKP)
| | - Youngmi Kim Pak
- Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul, Korea
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Korea
- * E-mail: (SK); (YKP)
| |
Collapse
|
45
|
Kim E, Liu NC, Yu IC, Lin HY, Lee YF, Sparks JD, Chen LM, Chang C. Metformin inhibits nuclear receptor TR4-mediated hepatic stearoyl-CoA desaturase 1 gene expression with altered insulin sensitivity. Diabetes 2011; 60:1493-503. [PMID: 21478464 PMCID: PMC3292323 DOI: 10.2337/db10-0393] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE TR4 is a nuclear receptor without clear pathophysiological roles. We investigated the roles of hepatic TR4 in the regulation of lipogenesis and insulin sensitivity in vivo and in vitro. RESEARCH DESIGN AND METHODS TR4 activity and phosphorylation assays were carried out using hepatocytes and various TR4 wild-type and mutant constructs. Liver tissues from TR4 knockout, C57BL/6, and db/db mice were examined to investigate TR4 target gene stearoyl-CoA desaturase (SCD) 1 regulation. RESULTS TR4 transactivation is inhibited via phosphorylation by metformin-induced AMP-activated protein kinase (AMPK) at the amino acid serine 351, which results in the suppression of SCD1 gene expression. Additional mechanistic dissection finds TR4-transactivated SCD1 promoter activity via direct binding to the TR4-responsive element located at -243 to -255 on the promoter region. The pathophysiological consequences of the metformin→AMPK→TR4→SCD1 pathway are examined via TR4 knockout mice and primary hepatocytes with either knockdown or overexpression of TR4. The results show that the suppression of SCD1 via loss of TR4 resulted in reduced fat mass and increased insulin sensitivity with increased β-oxidation and decreased lipogenic gene expression. CONCLUSIONS The pathway from metformin→AMPK→TR4→SCD1→insulin sensitivity suggests that TR4 may function as an important modulator to control lipid metabolism, which sheds light on the use of small molecules to modulate TR4 activity as a new alternative approach to battle the metabolic syndrome.
Collapse
Affiliation(s)
- Eungseok Kim
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
- Department of Biological Sciences, Chonnam National University, Gwangju, Korea
| | - Ning-Chun Liu
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
| | - I-Chen Yu
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
| | - Hung-Yun Lin
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
| | - Yi-Fen Lee
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
| | - Janet D. Sparks
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
| | - Lu-Min Chen
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
- Sex Hormone Research Center, China Medical University/Hospital, Taichung, Taiwan
| | - Chawnshang Chang
- Departments of Pathology and Urology and the Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York
- Sex Hormone Research Center, China Medical University/Hospital, Taichung, Taiwan
- Corresponding author: Chawnshang Chang,
| |
Collapse
|