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Diwan R, Gaytan SL, Bhatt HN, Pena-Zacarias J, Nurunnabi M. Liver fibrosis pathologies and potentials of RNA based therapeutics modalities. Drug Deliv Transl Res 2024:10.1007/s13346-024-01551-8. [PMID: 38446352 DOI: 10.1007/s13346-024-01551-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2024] [Indexed: 03/07/2024]
Abstract
Liver fibrosis (LF) occurs when the liver tissue responds to injury or inflammation by producing excessive amounts of scar tissue, known as the extracellular matrix. This buildup stiffens the liver tissue, hinders blood flow, and ultimately impairs liver function. Various factors can trigger this process, including bloodborne pathogens, genetic predisposition, alcohol abuse, non-steroidal anti-inflammatory drugs, non-alcoholic steatohepatitis, and non-alcoholic fatty liver disease. While some existing small-molecule therapies offer limited benefits, there is a pressing need for more effective treatments that can truly cure LF. RNA therapeutics have emerged as a promising approach, as they can potentially downregulate cytokine levels in cells responsible for liver fibrosis. Researchers are actively exploring various RNA-based therapeutics, such as mRNA, siRNA, miRNA, lncRNA, and oligonucleotides, to assess their efficacy in animal models. Furthermore, targeted drug delivery systems hold immense potential in this field. By utilizing lipid nanoparticles, exosomes, nanocomplexes, micelles, and polymeric nanoparticles, researchers aim to deliver therapeutic agents directly to specific biomarkers or cytokines within the fibrotic liver, increasing their effectiveness and reducing side effects. In conclusion, this review highlights the complex nature of liver fibrosis, its underlying causes, and the promising potential of RNA-based therapeutics and targeted delivery systems. Continued research in these areas could lead to the development of more effective and personalized treatment options for LF patients.
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Affiliation(s)
- Rimpy Diwan
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
- Department of Biomedical Engineering, College of Engineering, The University of Texas El Paso, El Paso, TX, 79968, USA
| | - Samantha Lynn Gaytan
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
- Department of Interdisciplinary Health Sciences, College of Health Sciences, The University of Texas El Paso, El Paso, Texas, 79968, USA
| | - Himanshu Narendrakumar Bhatt
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
- Department of Biomedical Engineering, College of Engineering, The University of Texas El Paso, El Paso, TX, 79968, USA
| | - Jacqueline Pena-Zacarias
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
- Department of Biological Sciences, College of Science, The University of Texas El Paso, El Paso, Texas, 79968, USA
| | - Md Nurunnabi
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA.
- Department of Biomedical Engineering, College of Engineering, The University of Texas El Paso, El Paso, TX, 79968, USA.
- Department of Interdisciplinary Health Sciences, College of Health Sciences, The University of Texas El Paso, El Paso, Texas, 79968, USA.
- Border Biomedical Research Center, The University of Texas El Paso, El Paso, TX, 79968, USA.
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Lee YS, Seki E. In Vivo and In Vitro Models to Study Liver Fibrosis: Mechanisms and Limitations. Cell Mol Gastroenterol Hepatol 2023; 16:355-367. [PMID: 37270060 PMCID: PMC10444957 DOI: 10.1016/j.jcmgh.2023.05.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/26/2023] [Accepted: 05/26/2023] [Indexed: 06/05/2023]
Abstract
Liver fibrosis is a common result of liver injury owing to various kinds of chronic liver diseases. A deeper understanding of the pathophysiology of liver fibrosis and identifying potential therapeutic targets of liver fibrosis is important because liver fibrosis may progress to advanced liver diseases, such as cirrhosis and hepatocellular carcinoma. Despite numerous studies, the underlying mechanisms of liver fibrosis remain unclear. Mechanisms of the development and progression of liver fibrosis differ according to etiologies. Therefore, appropriate liver fibrosis models should be selected according to the purpose of the study and the type of underlying disease. Many in vivo animal and in vitro models have been developed to study liver fibrosis. However, there are no perfect preclinical models for liver fibrosis. In this review, we summarize the current in vivo and in vitro models for studying liver fibrosis and highlight emerging in vitro models, including organoids and liver-on-a-chip models. In addition, we discuss the mechanisms and limitations of each model.
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Affiliation(s)
- Young-Sun Lee
- Karsh Division of Gastroenterology and Hepatology, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California; Department of Internal Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Ekihiro Seki
- Karsh Division of Gastroenterology and Hepatology, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California.
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Chandrashekar DV, Steinberg RA, Han D, Sumbria RK. Alcohol as a Modifiable Risk Factor for Alzheimer's Disease-Evidence from Experimental Studies. Int J Mol Sci 2023; 24:9492. [PMID: 37298443 PMCID: PMC10253673 DOI: 10.3390/ijms24119492] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/16/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by cognitive impairment and memory loss. Epidemiological evidence suggests that heavy alcohol consumption aggravates AD pathology, whereas low alcohol intake may be protective. However, these observations have been inconsistent, and because of methodological discrepancies, the findings remain controversial. Alcohol-feeding studies in AD mice support the notion that high alcohol intake promotes AD, while also hinting that low alcohol doses may be protective against AD. Chronic alcohol feeding to AD mice that delivers alcohol doses sufficient to cause liver injury largely promotes and accelerates AD pathology. The mechanisms by which alcohol can modulate cerebral AD pathology include Toll-like receptors, protein kinase-B (Akt)/mammalian target of rapamycin (mTOR) pathway, cyclic adenosine monophosphate (cAMP) response element-binding protein phosphorylation pathway, glycogen synthase kinase 3-β, cyclin-dependent kinase-5, insulin-like growth factor type-1 receptor, modulation of β-amyloid (Aβ) synthesis and clearance, microglial mediated, and brain endothelial alterations. Besides these brain-centric pathways, alcohol-mediated liver injury may significantly affect brain Aβ levels through alterations in the peripheral-to-central Aβ homeostasis. This article reviews published experimental studies (cell culture and AD rodent models) to summarize the scientific evidence and probable mechanisms (both cerebral and hepatic) by which alcohol promotes or protects against AD progression.
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Affiliation(s)
- Devaraj V. Chandrashekar
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA;
| | - Ross A. Steinberg
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA 91711, USA; (R.A.S.); (D.H.)
| | - Derick Han
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA 91711, USA; (R.A.S.); (D.H.)
| | - Rachita K. Sumbria
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA;
- Department of Neurology, University of California, Irvine, CA 92697, USA
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4
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Thoen RU, Longo L, Leonhardt LC, Pereira MHM, Rampelotto PH, Cerski CTS, Álvares-da-Silva MR. Alcoholic liver disease and intestinal microbiota in an experimental model: Biochemical, inflammatory, and histologic parameters. Nutrition 2023; 106:111888. [PMID: 36436334 DOI: 10.1016/j.nut.2022.111888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 10/03/2022] [Accepted: 10/11/2022] [Indexed: 11/05/2022]
Abstract
OBJECTIVES Alcoholic liver disease (ALD) is the leading cause of alcohol-related deaths worldwide. Experimental ALD models are expensive and difficult to reproduce. A low-cost, reproducible ALD model was developed, and liver damage compared with the gut microbiota. The aims of this study were to develop an experimental model of ALD, through a high-fat diet, the chronic use of ethanol, and intragastric alcohol binge; and to evaluate the composition of the gut microbiota and its correlation with markers of inflammatory and liver disease progression in this model. METHODS Adult male Wistar rats were randomized (N = 24) to one of three groups: control (standard diet and water + 0.05% saccharin), ALC4 and ALC8 (sunflower seed, 10% ethanol + 0.05% saccharin for 4 and 8 wk, respectively). On the last day, ALC4/8 received alcoholic binge (5 g/kg). Clinical, nutritional, biochemical, inflammatory, pathologic, and gut microbiota data were analyzed. RESULTS ALC4/8 animals consumed more alcohol and lipids (P < 0.01) and less total energy, liquids, solids, carbohydrates, and proteins (P < 0.01), and gained less weight (P < 0.01) than controls. ALC8 had lower Lee index scores than controls and ALC4 (P < 0.01). Aminotransferases increased and albumin diminished in ALC4/8 but not in the control group (P < 0.03 for all). Glucose and aspartate transaminase/alanine aminotransaminase ratios were higher in the ALC8 rats than in the controls (P < 0.03). Cholesterol was higher in ALC4 and lower in ALC8 compared with controls (P < 0.03). Albumin and high-density lipoprotein cholesterol levels were lower in ALC8 (P < 0.03). Hepatic concentration of triacylglycerols was higher in ALC8 than in ALC4 and controls (P < 0.05). ALC4/8 presented microvesicular grade 2 and 3 steatosis, respectively, and macrovesicular grade 1. No change in the gene expression of inflammatory markers between groups was seen. ALC4/8 had lower fecal bacterial α-diversity and relative abundance of Firmicutes (P < 0.005) and greater Bacterioidetes (P < 0.0007) and Protobacteria (P < 0.001) than controls. Gut microbiota correlated with serum and liver lipids, steatosis, albumin, and aminotransferases (P < 0.01 for all). CONCLUSION The model induced nutritional, biochemical, histologic, and gut microbiota changes, and appears to be useful in the study of therapeutic targets.
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Affiliation(s)
- Rutiane Ullmann Thoen
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Larisse Longo
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Luiza Cecília Leonhardt
- Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Matheus Henrique Mariano Pereira
- Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Pabulo Henrique Rampelotto
- Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Carlos Thadeu Schmidt Cerski
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Unit of Surgical Pathology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Mário Reis Álvares-da-Silva
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Experimental Hepatology and Gastroenterology Laboratory, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil; Division of Gastroenterology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
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Garcia J, Chang R, Steinberg RA, Arce A, Yang J, Van Der Eb P, Abdullah T, Chandrashekar DV, Eck SM, Meza P, Liu ZX, Cadenas E, Cribbs DH, Kaplowitz N, Sumbria RK, Han D. Modulation of hepatic amyloid precursor protein and lipoprotein receptor-related protein 1 by chronic alcohol intake: Potential link between liver steatosis and amyloid-β. Front Physiol 2022; 13:930402. [PMID: 36187787 PMCID: PMC9520570 DOI: 10.3389/fphys.2022.930402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 08/09/2022] [Indexed: 11/13/2022] Open
Abstract
Heavy alcohol consumption is a known risk factor for various forms of dementia and the development of Alzheimer’s disease (AD). In this work, we investigated how intragastric alcohol feeding may alter the liver-to-brain axis to induce and/or promote AD pathology. Four weeks of intragastric alcohol feeding to mice, which causes significant fatty liver (steatosis) and liver injury, caused no changes in AD pathology markers in the brain [amyloid precursor protein (APP), presenilin], except for a decrease in microglial cell number in the cortex of the brain. Interestingly, the decline in microglial numbers correlated with serum alanine transaminase (ALT) levels, suggesting a potential link between liver injury and microglial loss in the brain. Intragastric alcohol feeding significantly affected two hepatic proteins important in amyloid-beta (Aβ) processing by the liver: 1) alcohol feeding downregulated lipoprotein receptor-related protein 1 (LRP1, ∼46%), the major receptor in the liver that removes Aβ from blood and peripheral organs, and 2) alcohol significantly upregulated APP (∼2-fold), a potentially important source of Aβ in the periphery and brain. The decrease in hepatic LRP1 and increase in hepatic APP likely switches the liver from being a remover or low producer of Aβ to an important source of Aβ in the periphery, which can impact the brain. The downregulation of LRP1 and upregulation of APP in the liver was observed in the first week of intragastric alcohol feeding, and also occurred in other alcohol feeding models (NIAAA binge alcohol model and intragastric alcohol feeding to rats). Modulation of hepatic LRP1 and APP does not seem alcohol-specific, as ob/ob mice with significant steatosis also had declines in LRP1 and increases in APP expression in the liver. These findings suggest that liver steatosis rather than alcohol-induced liver injury is likely responsible for regulation of hepatic LRP1 and APP. Both obesity and alcohol intake have been linked to AD and our data suggests that liver steatosis associated with these two conditions modulates hepatic LRP1 and APP to disrupt Aβ processing by the liver to promote AD.
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Affiliation(s)
- Jerome Garcia
- Department of Biology, University of La Verne, Verne, CA, United States
| | - Rudy Chang
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA, United States
| | - Ross A. Steinberg
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
| | - Aldo Arce
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
| | - Joshua Yang
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA, United States
| | - Peter Van Der Eb
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
| | - Tamara Abdullah
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA, United States
| | - Devaraj V. Chandrashekar
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA, United States
| | - Sydney M. Eck
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
| | - Pablo Meza
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
| | - Zhang-Xu Liu
- Department of Molecular Microbiology and Immunology, USC/Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Enrique Cadenas
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, United States
| | - David H. Cribbs
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, Irvine, CA, United States
| | - Neil Kaplowitz
- University of Southern California Research Center for Liver Diseases and Southern California Research Center for ALPD, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Rachita K. Sumbria
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA, United States
- Department of Neurology, University of California, Irvine, Irvine, CA, United States
| | - Derick Han
- School of Pharmacy and Health Sciences, Keck Graduate Institute, Claremont, CA, United States
- *Correspondence: Derick Han,
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Zhu L, Li HD, Xu JJ, Li JJ, Cheng M, Meng XM, Huang C, Li J. Advancements in the Alcohol-Associated Liver Disease Model. Biomolecules 2022; 12:biom12081035. [PMID: 36008929 PMCID: PMC9406170 DOI: 10.3390/biom12081035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/22/2022] [Accepted: 07/25/2022] [Indexed: 02/06/2023] Open
Abstract
Alcohol-associated liver disease (ALD) is an intricate disease that results in a broad spectrum of liver damage. The presentation of ALD can include simple steatosis, steatohepatitis, liver fibrosis, cirrhosis, and even hepatocellular carcinoma (HCC). Effective prevention and treatment strategies are urgently required for ALD patients. In previous decades, numerous rodent models were established to investigate the mechanisms of alcohol-associated liver disease and explore therapeutic targets. This review provides a summary of the latest developments in rodent models, including those that involve EtOH administration, which will help us to understand the characteristics and causes of ALD at different stages. In addition, we discuss the pathogenesis of ALD and summarize the existing in vitro models. We analyse the pros and cons of these models and their translational relevance and summarize the insights that have been gained regarding the mechanisms of alcoholic liver injury.
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Affiliation(s)
| | | | | | | | | | - Xiao-Ming Meng
- Correspondence: (X.-M.M.); (C.H.); (J.L.); Tel.: +86-551-65161001 (J.L.); Fax: +86-551-65161001 (J.L.)
| | - Cheng Huang
- Correspondence: (X.-M.M.); (C.H.); (J.L.); Tel.: +86-551-65161001 (J.L.); Fax: +86-551-65161001 (J.L.)
| | - Jun Li
- Correspondence: (X.-M.M.); (C.H.); (J.L.); Tel.: +86-551-65161001 (J.L.); Fax: +86-551-65161001 (J.L.)
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Schonfeld M, O’Neil M, Villar MT, Artigues A, Averilla J, Gunewardena S, Weinman SA, Tikhanovich I. A Western diet with alcohol in drinking water recapitulates features of alcohol-associated liver disease in mice. Alcohol Clin Exp Res 2021; 45:1980-1993. [PMID: 34523155 PMCID: PMC9006178 DOI: 10.1111/acer.14700] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Mouse models of alcohol-associated liver disease vary greatly in their ease of implementation and the pathology they produce. Effects range from steatosis and mild inflammation with the Lieber-DeCarli liquid diet to severe inflammation, fibrosis, and pyroptosis seen with the Tsukamoto-French intragastric feeding model. Implementation of all of these models is limited by the labor-intensive nature of the protocols and the specialized skills necessary for successful intragastric feeding. We thus sought to develop a new model to reproduce features of alcohol-induced inflammation and fibrosis with minimal operational requirements. METHODS Over a 16-week period, mice were fed ad libitum with a pelleted high-fat Western diet (WD; 40% calories from fat) and alcohol added to the drinking water. We found the optimal alcohol consumption to be that at which the alcohol concentration was 20% for 4 days and 10% for 3 days per week. Control mice received WD pellets with water alone. RESULTS Alcohol consumption was 18 to 20 g/kg/day in males and 20 to 22 g/kg/day in females. Mice in the alcohol groups developed elevated serum transaminase levels after 12 weeks in males and 10 weeks in females. At 16 weeks, both males and females developed liver inflammation, steatosis, and pericellular fibrosis. Control mice on WD without alcohol had mild steatosis only. Alcohol-fed mice showed reduced HNF4α mRNA and protein expression. HNF4α is a master regulator of hepatocyte differentiation, down-regulation of which is a known driver of hepatocellular failure in alcoholic hepatitis. CONCLUSION A simple-to-administer, 16-week WD alcohol model recapitulates the inflammatory, fibrotic, and gene expression aspects of human alcohol-associated steatohepatitis.
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Affiliation(s)
- Michael Schonfeld
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Maura O’Neil
- Department of Pathology, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
- Liver Center, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Maria T Villar
- Department of Biochemistry, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Antonio Artigues
- Department of Biochemistry, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Janice Averilla
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Sumedha Gunewardena
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
| | - Steven A. Weinman
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
- Liver Center, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
- Kansas City VA Medical Center, Kansas City, MO, USA
| | - Irina Tikhanovich
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
- Liver Center, University of Kansas Medical Center, Kansas City, KS 66160, U.S.A
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8
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Liu SX, Du YC, Zeng T. A mini-review of the rodent models for alcoholic liver disease: shortcomings, application, and future prospects. Toxicol Res (Camb) 2021; 10:523-530. [PMID: 34141166 DOI: 10.1093/toxres/tfab042] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/12/2021] [Accepted: 04/15/2021] [Indexed: 12/19/2022] Open
Abstract
Rodents are the most common models in studies of alcoholic liver disease (ALD). Although several rodents ALD models have been established and multiple mechanisms have been elucidated based on them, these models have some non-negligible shortcomings, specifically only inducing early stage (mainly steatosis, slight to moderate steatohepatitis) but not the whole spectrum of human ALD. The resistance of rodents to advanced ALD has been suggested to be due to the physiological differences between rodents and human beings. Previous studies have reported significant interstrain differences in the susceptibility to ethanol-induced liver injury and in the manifestation of ALD (such as different alteration of lipid profiles). Therefore, it would be interesting to characterize the manifestation of ethanol-induced liver damage in various rodents, which may provide a recommendation to investigators of ALD. Furthermore, more severe ALD models need to be established for the study of serious ALD forms, which may be achieved by using genetic modified rodents.
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Affiliation(s)
- Shi-Xuan Liu
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, 44 Wenhua Xi Road, Jinan, Shandong, 250012, China
| | - Yan-Chao Du
- Jinan Institute for Product Quality Inspection, 1311 Longao Bei Road, Jinan, Shandong, 250102, China
| | - Tao Zeng
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, 44 Wenhua Xi Road, Jinan, Shandong, 250012, China
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Seitz HK, Neuman MG. The History of Alcoholic Liver Disease: From an Unrecognized Disease to One of the Most Frequent Diseases in Hepatology. J Clin Med 2021; 10:858. [PMID: 33669694 PMCID: PMC7921942 DOI: 10.3390/jcm10040858] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 02/10/2021] [Accepted: 02/13/2021] [Indexed: 02/06/2023] Open
Abstract
This review describes the history of alcoholic liver disease from the beginning of the 1950s until now. It details how the hepatotoxicity of alcohol was discovered by epidemiology and basic research primarily by using new feeding techniques in rodents and primates. The article also recognizes the pioneering work of scientists who contributed to the understanding of the pathophysiology of alcoholic liver disease. In addition, clinical aspects, such as the development of diagnostics and treatment options for alcoholic liver disease, are discussed. Up-to-date knowledge of the mechanism of the disease in 2020 is presented.
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Affiliation(s)
- Helmut K. Seitz
- Centre of Liver and Alcohol Diseases, Ethianum Clinic, 69115 Heidelberg, Germany
- Faculty of Medicine, University of Heidelberg, 69117 Heidelberg, Germany
| | - Manuela G. Neuman
- In Vitro Drug Safety and Biotechnology and the Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5G 1L5, Canada;
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10
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Tao XM, Li D, Zhang C, Wen GH, Wu C, Xu YY, Kan Y, Lu WP, Ding HY, Yang Y. Salvianolic acid B protects against acute and chronic liver injury by inhibiting Smad2C/L phosphorylation. Exp Ther Med 2021; 21:341. [PMID: 33732314 PMCID: PMC7903446 DOI: 10.3892/etm.2021.9772] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 03/19/2020] [Indexed: 12/17/2022] Open
Abstract
Salvianolic acid B (Sal B) has strong antioxidant and anti-fibrosis effects, which are related to the transforming growth factor β/Smad signaling pathway. However, how Sal B affects this antioxidant pathway and the phosphorylation (p-) of Smad2 at both the COOH-terminal (pSmad2C) and linker region (pSmad2L) are unknown. The aims of the present study were to investigate the underlying mechanisms of Sal B on acute and chronic liver injury induced by CCl4 and H2O2, and its effects on p-Smad2C/L. In in vivo experiments, acute and chronic liver injury models were induced by CCl4, and the oxidative damage cell model was established in vitro with H2O2. Liver histopathology was assessed using hematoxylin and eosin and Van Gieson's staining. Moreover, serum biochemical indicators were analyzed using specific assay kits. Furthermore, the present study evaluated the oxidant/antioxidant status in acute and chronic liver injury models by oxidative stress parameters such as malondialdehyde, glutathione and superoxide dismutase. In addition, western blot analysis was performed to analyze the protein expression levels of pSmad2C, pSmad2L, nuclear factor erythroid-2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1). It was found that Sal B improved liver histology, decreased the levels of aminotransferase and attenuated oxidative stress in acute and chronic liver injury models. Additionally, the protein expression levels of pSmad2C and pSmad2L were decreased, but Nrf2 and HO-1 expression levels were increased both in vivo and in vitro. Collectively, the present results suggested that Sal B may protect against acute and chronic liver injury via inhibition of Smad2C/L phosphorylation, and the Nrf2/HO-1 signaling pathway may play an important role in this process.
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Affiliation(s)
- Xiang-Ming Tao
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Dong Li
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Chong Zhang
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Guang-Hua Wen
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Chao Wu
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Yuan-Yuan Xu
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Yue Kan
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Wan-Peng Lu
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Han-Yan Ding
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
| | - Yan Yang
- Department of Pharmacology, Anhui Medical University, Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Hefei, Anhui 230032, P.R. China
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11
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Buyco DG, Martin J, Jeon S, Hooks R, Lin C, Carr R. Experimental models of metabolic and alcoholic fatty liver disease. World J Gastroenterol 2021; 27:1-18. [PMID: 33505147 PMCID: PMC7789066 DOI: 10.3748/wjg.v27.i1.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 11/01/2020] [Accepted: 12/06/2020] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a multi-systemic disease that is considered the hepatic manifestation of metabolic syndrome (MetS). Because alcohol consumption in NAFLD patients is common, there is a significant overlap in the pathogenesis of NAFLD and alcoholic liver disease (ALD). Indeed, MetS also significantly contributes to liver injury in ALD patients. This “syndrome of metabolic and alcoholic steatohepatitis” (SMASH) is thus expected to be a more prevalent presentation in liver patients, as the obesity epidemic continues. Several pre-clinical experimental models that couple alcohol consumption with NAFLD-inducing diet or genetic obesity have been developed to better understand the pathogenic mechanisms of SMASH. These models indicate that concomitant MetS and alcohol contribute to lipid dysregulation, oxidative stress, and the induction of innate immune response. There are significant limitations in the applicability of these models to human disease, such as the ability to induce advanced liver injury or replicate patterns in human food/alcohol consumption. Thus, there remains a need to develop models that accurately replicate patterns of obesogenic diet and alcohol consumption in SMASH patients.
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Affiliation(s)
- Delfin Gerard Buyco
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Jasmin Martin
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Sookyoung Jeon
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Royce Hooks
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Chelsea Lin
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Rotonya Carr
- Division of Gastroenterology, University of Pennsylvania, Philadelphia, PA 19104, United States
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12
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Sheriff L, Khan RS, Saborano R, Wilkin R, Luu NT, Gunther UL, Hubscher SG, Newsome PN, Lalor PF. Alcoholic hepatitis and metabolic disturbance in female mice: a more tractable model than Nrf2-/- animals. Dis Model Mech 2020; 13:dmm046383. [PMID: 33067186 PMCID: PMC7790192 DOI: 10.1242/dmm.046383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 10/07/2020] [Indexed: 12/20/2022] Open
Abstract
Alcoholic hepatitis (AH) is the dramatic acute presentation of alcoholic liver disease, with a 15% mortality rate within 28 days in severe cases. Research into AH has been hampered by the lack of effective and reproducible murine models that can be operated under different regulatory frameworks internationally. The liquid Lieber-deCarli (LdC) diet has been used as a means of ad libitum delivery of alcohol but without any additional insult, and is associated with relatively mild liver injury. The transcription factor nuclear factor-erythroid 2-related factor 2 (Nrf2) protects against oxidative stress, and mice deficient in this molecule are suggested to be more sensitive to alcohol-induced injury. We have established a novel model of AH in mice and compared the nature of liver injury in C57/BL6 wild-type (WT) versus Nrf2-/- mice. Our data showed that both WT and Nrf2-/- mice demonstrate robust weight loss, and an increase in serum transaminase, steatosis and hepatic inflammation when exposed to diet and ethanol. This is accompanied by an increase in peripheral blood and hepatic myeloid cell populations, fibrogenic response and compensatory hepatocyte regeneration. We also noted characteristic disturbances in hepatic carbohydrate and lipid metabolism. Importantly, use of Nrf2-/- mice did not increase hepatic injury responses in our hands, and female WT mice exhibited a more-reproducible response. Thus, we have demonstrated that this simple murine model of AH can be used to induce an injury that recreates many of the key human features of AH - without the need for challenging surgical procedures to administer ethanol. This will be valuable for understanding of the pathogenesis of AH, for testing new therapeutic treatments or devising metabolic approaches to manage patients whilst in medical care.This article has an associated First Person interview with the joint first authors of the paper.
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Affiliation(s)
- Lozan Sheriff
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Reenam S Khan
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Raquel Saborano
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Richard Wilkin
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Nguyet-Thin Luu
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Ulrich L Gunther
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham B15 2TT, UK
- Institute of Chemistry and Metabolomics, University of Lübeck, 23562 Lübeck, Germany
| | - Stefan G Hubscher
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Liver Unit, University Hospitals Birmingham, Birmingham B15 2TH, UK
- Department of Cellular Pathology, University Hospitals Birmingham, Birmingham B15 2TH, UK
| | - Philip N Newsome
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | - Patricia F Lalor
- Centre for Liver and Gastroenterology Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
- Birmingham National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
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13
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Lin YL, Li Y. Study on the hepatocellular carcinoma model with metastasis. Genes Dis 2020; 7:336-350. [PMID: 32884988 PMCID: PMC7452459 DOI: 10.1016/j.gendis.2019.12.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 12/07/2019] [Accepted: 12/31/2019] [Indexed: 02/07/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is one of the most common causes of cancer-related death around the world due to advanced clinical stage at diagnosis, high incidence of recurrence and metastasis after surgical treatment. It is in urgent need to create appropriate animal models to explore the mechanism, patterns, risk factors, and therapeutic strategies of HCC metastasis and recurrence. However, most of the established models lack the phenotype of invasion and metastasis in patient, or have unstable phenotype. To establish HCC models with stable metastasis phenotype requires profound understanding in cancer metastasis biology and scientific methodology. Over the past 3 decades, HCC models with stable metastasis have been extensively studied. This paper reviewed the history and development of HCC animal models and cell models, focusing on the screening and maintaining of metastatic potential and phenotype. In-depth studies using these models vastly promote the understanding of cellular and molecular mechanisms and development of therapeutic strategies on HCC metastasis.
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Affiliation(s)
- Yu-Lin Lin
- Department of Peritoneal Cancer Surgery, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, China
| | - Yan Li
- Department of Peritoneal Cancer Surgery, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, China
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14
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Nevzorova YA, Boyer-Diaz Z, Cubero FJ, Gracia-Sancho J. Animal models for liver disease - A practical approach for translational research. J Hepatol 2020; 73:423-440. [PMID: 32330604 DOI: 10.1016/j.jhep.2020.04.011] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/06/2020] [Accepted: 04/06/2020] [Indexed: 12/11/2022]
Abstract
Animal models are crucial for improving our understanding of human pathogenesis, enabling researchers to identify therapeutic targets and test novel drugs. In the current review, we provide a comprehensive summary of the most widely used experimental models of chronic liver disease, starting from early stages of fatty liver disease (non-alcoholic and alcoholic) to steatohepatitis, advanced cirrhosis and end-stage primary liver cancer. We focus on aspects such as reproducibility and practicality, discussing the advantages and weaknesses of available models for researchers who are planning to perform animal studies in the near future. Additionally, we summarise current and prospective models based on human tissue bioengineering.
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Affiliation(s)
- Yulia A Nevzorova
- Department of Genetics, Physiology and Microbiology, Faculty of Biology, Complutense University, Madrid, Spain; 12 de Octubre Health Research Institute (imas12), Madrid, Spain; Department of Internal Medicine III, University Hospital RWTH Aachen, Aachen, Germany
| | - Zoe Boyer-Diaz
- Liver Vascular Biology Research Group, Barcelona Hepatic Hemodynamic Unit, IDIBAPS Biomedical Research Institute, Barcelona, Spain; Barcelona Liver Bioservices, Barcelona, Spain
| | - Francisco Javier Cubero
- 12 de Octubre Health Research Institute (imas12), Madrid, Spain; Department of Immunology, Ophthalmology & ENT, Complutense University School of Medicine, Madrid, Spain.
| | - Jordi Gracia-Sancho
- Liver Vascular Biology Research Group, Barcelona Hepatic Hemodynamic Unit, IDIBAPS Biomedical Research Institute, Barcelona, Spain; Barcelona Liver Bioservices, Barcelona, Spain; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain; Hepatology, Department of Biomedical Research, University of Bern, Bern, Switzerland.
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15
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Berumen J, Baglieri J, Kisseleva T, Mekeel K. Liver fibrosis: Pathophysiology and clinical implications. WIREs Mech Dis 2020; 13:e1499. [PMID: 32713091 DOI: 10.1002/wsbm.1499] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 04/30/2020] [Accepted: 05/21/2020] [Indexed: 02/06/2023]
Abstract
Liver fibrosis is a clinically significant finding that has major impacts on patient morbidity and mortality. The mechanism of fibrosis involves many different cellular pathways, but the major cell type involved appears to be hepatic stellate cells. Many liver diseases, including Hepatitis B, C, and fatty liver disease cause ongoing hepatocellular damage leading to liver fibrosis. No matter the cause of liver disease, liver-related mortality increases exponentially with increasing fibrosis. The progression to cirrhosis brings more dramatic mortality and higher incidence of hepatocellular carcinoma. Fibrosis can also affect outcomes following liver transplantation in adult and pediatric patients and require retransplantation. Drugs exist to treat Hepatitis B and C that reverse fibrosis in patients with those viral diseases, but there are currently no therapies to directly treat liver fibrosis. Several mouse models of chronic liver diseases have been successfully reversed using novel drug targets with current therapies focusing mostly on prevention of myofibroblast activation. Further research in these areas could lead to development of drugs to treat fibrosis, which will have invaluable impact on patient survival. This article is categorized under: Metabolic Diseases > Molecular and Cellular Physiology.
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Affiliation(s)
- Jennifer Berumen
- Department of Surgery, University of California, San Diego, California, USA
| | - Jacopo Baglieri
- Department of Surgery, University of California, San Diego, California, USA.,Department of Medicine, University of California, San Diego, California, USA
| | - Tatiana Kisseleva
- Department of Surgery, University of California, San Diego, California, USA
| | - Kristin Mekeel
- Department of Surgery, University of California, San Diego, California, USA
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16
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Furuya S, Cichocki JA, Konganti K, Dreval K, Uehara T, Katou Y, Fukushima H, Kono H, Pogribny IP, Argemi J, Bataller R, Rusyn I. Histopathological and Molecular Signatures of a Mouse Model of Acute-on-Chronic Alcoholic Liver Injury Demonstrate Concordance With Human Alcoholic Hepatitis. Toxicol Sci 2020; 170:427-437. [PMID: 30517762 DOI: 10.1093/toxsci/kfy292] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Human alcoholic hepatitis (AH) carries a high mortality rate. AH is an acute-on-chronic form of liver injury characterized by hepatic steatosis, ballooned hepatocytes, neutrophil infiltration, and pericellular fibrosis. We aimed to study the pathogenesis of AH in an animal model which combines chronic hepatic fibrosis with intragastric alcohol administration. Adult male C57BL6/J mice were treated with CCl4 (0.2 ml/kg, 2×weekly by intraperitoneal injections for 6 weeks) to induce chronic liver fibrosis. Then, ethyl alcohol (up to 25 g/kg/day for 3 weeks) was administered continuously to mice via a gastric feeding tube, with or without one-half dose of CCl4. Liver and serum markers and liver transcriptome were evaluated to characterize acute-on-chronic-alcoholic liver disease in our model. CCl4 or alcohol treatment alone induced liver fibrosis or steatohepatitis, respectively, findings that were consistent with expected pathology. Combined treatment resulted in a marked exacerbation of liver injury, as evident by the development of inflammation, steatosis, and pericellular fibrosis, pathological features of human AH. E. coli and Candida were also detected in livers of mice cotreated with CCl4 and alcohol, indicating pathogen translocation from gut to liver, similar to human AH. Importantly, liver transcriptomic changes specific to combined treatment group demonstrated close concordance with pathways perturbed in patients with severe AH. Overall, mice treated with CCl4 and alcohol displayed key molecular and pathological characteristics of human AH-pericellular fibrosis, increased hepatic bacterial load, and dysregulation of the same molecular pathways. This model may be useful for developing therapeutics for AH.
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Affiliation(s)
| | | | - Kranti Konganti
- Texas A&M Institute for Genome Sciences and Society, Texas A&M University, College Station, Texas 77843
| | - Kostiantyn Dreval
- Program in Cancer Genetics, Epigenetics and Genomics, Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico Comprehensive Cancer Center, Albuquerque, New Mexico 87102
| | - Takeki Uehara
- Laboratory of Veterinary Pathology, Osaka Prefecture University, Osaka, Japan
| | - Yuuki Katou
- Laboratory of Veterinary Pathology, Osaka Prefecture University, Osaka, Japan
| | | | - Hiroshi Kono
- First Department of Surgery, University of Yamanashi, Yamanashi, Japan
| | - Igor P Pogribny
- National Center for Toxicological Research, U.S. FDA, Jefferson, Arkansas 72079
| | - Josepmaria Argemi
- Department of Medicine, Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Ramon Bataller
- Department of Medicine, Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Ivan Rusyn
- Department of Veterinary Integrative Biosciences
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17
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Heydari Z, Najimi M, Mirzaei H, Shpichka A, Ruoss M, Farzaneh Z, Montazeri L, Piryaei A, Timashev P, Gramignoli R, Nussler A, Baharvand H, Vosough M. Tissue Engineering in Liver Regenerative Medicine: Insights into Novel Translational Technologies. Cells 2020; 9:E304. [PMID: 32012725 PMCID: PMC7072533 DOI: 10.3390/cells9020304] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/17/2020] [Accepted: 01/21/2020] [Indexed: 12/15/2022] Open
Abstract
Organ and tissue shortage are known as a crucially important public health problem as unfortunately a small percentage of patients receive transplants. In the context of emerging regenerative medicine, researchers are trying to regenerate and replace different organs and tissues such as the liver, heart, skin, and kidney. Liver tissue engineering (TE) enables us to reproduce and restore liver functions, fully or partially, which could be used in the treatment of acute or chronic liver disorders and/or generate an appropriate functional organ which can be transplanted or employed as an extracorporeal device. In this regard, a variety of techniques (e.g., fabrication technologies, cell-based technologies, microfluidic systems and, extracorporeal liver devices) could be applied in tissue engineering in liver regenerative medicine. Common TE techniques are based on allocating stem cell-derived hepatocyte-like cells or primary hepatocytes within a three-dimensional structure which leads to the improvement of their survival rate and functional phenotype. Taken together, new findings indicated that developing liver tissue engineering-based techniques could pave the way for better treatment of liver-related disorders. Herein, we summarized novel technologies used in liver regenerative medicine and their future applications in clinical settings.
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Affiliation(s)
- Zahra Heydari
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran; (Z.H.); (Z.F.)
- Department of Developmental Biology, University of Science and Culture, ACECR, Tehran 1665659911, Iran
| | - Mustapha Najimi
- Laboratory of Pediatric Hepatology and Cell Therapy, Institute of Experimental & Clinical Research, Université Catholique de Louvain, B-1200 Brussels, Belgium;
| | - Hamed Mirzaei
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan 121135879, Iran;
| | - Anastasia Shpichka
- Institute for Regenerative Medicine, Sechenov University, 119146 Moscow, Russia; (A.S.); (P.T.)
| | - Marc Ruoss
- Siegfried Weller Institute for Trauma Research, University of Tübingen, 72076 Tübingen, Germany; (M.R.); (A.N.)
| | - Zahra Farzaneh
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran; (Z.H.); (Z.F.)
| | - Leila Montazeri
- Department of Cell Engineering, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran;
| | - Abbas Piryaei
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran 1985717443, Iran
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran 1985717443, Iran
| | - Peter Timashev
- Institute for Regenerative Medicine, Sechenov University, 119146 Moscow, Russia; (A.S.); (P.T.)
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, 117977 Moscow, Russia
| | - Roberto Gramignoli
- Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet, 171 77 Stockholm, Sweden;
| | - Andreas Nussler
- Siegfried Weller Institute for Trauma Research, University of Tübingen, 72076 Tübingen, Germany; (M.R.); (A.N.)
| | - Hossein Baharvand
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran; (Z.H.); (Z.F.)
- Department of Developmental Biology, University of Science and Culture, ACECR, Tehran 1665659911, Iran
| | - Massoud Vosough
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran; (Z.H.); (Z.F.)
- Department of Regenerative Medicine, Cell Science Research Centre, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran 1665659911, Iran
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18
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Szabo G, Kamath PS, Shah VH, Thursz M, Mathurin P, Bataller R, Burra P, Castera L, Cortez Pinto H, Diehl AM, Gao B, Gilmore SI, Hampe J, Jürgen R, Karin M, Krag A, Leon D, Leptak C, Louvet A, Lucey M, McClain C, Nagy L, Pageaux G, Sanyal A, Schnabl B, Tiniakos D, Trautwein C, Tsukamoto H. Alcohol-Related Liver Disease: Areas of Consensus, Unmet Needs and Opportunities for Further Study. Hepatology 2019; 69:2271-2283. [PMID: 30645002 DOI: 10.1002/hep.30369] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/31/2018] [Indexed: 12/16/2022]
Abstract
A joint meeting of the European Association for the Study of the Liver (EASL) and the American Association for the Study of Liver Diseases (AASLD) was held in London on September 30 and October 1, 2017. The goals of the meeting were to identify areas of broad agreement and disagreement, develop consensus, and determine future directions to ultimately reduce the burden, morbidity, and mortality of alcohol-related liver disease (previously termed alcoholic liver disease). The specific aims of the meeting were to identify unmet needs and areas for future investigation, in order to reduce alcohol consumption, develop markers for diagnosis and prognosis of disease, and create a framework to test novel pharmacological agents with pre-specified treatment endpoints. A table summary of these goals and aims is provided in the context of epidemiology, current management strategies, next steps for future trials and translational science.
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Affiliation(s)
- Gyongyi Szabo
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA, US
| | - Patrick S Kamath
- Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, MN, US
| | - Vijay H Shah
- Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, MN, US
| | - Mark Thursz
- Digestive Diseases Division, Department of Surgery & Cancer, Imperial College, London, UK
| | - Philippe Mathurin
- Service des Maladies de l'Appareil Digestif, Hôpital Claude Huriez, Lille, France
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19
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Alcohol-related liver disease: Areas of consensus, unmet needs and opportunities for further study. J Hepatol 2019; 70:521-530. [PMID: 30658117 DOI: 10.1016/j.jhep.2018.10.041] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 10/26/2018] [Accepted: 10/31/2018] [Indexed: 12/19/2022]
Abstract
A joint meeting of the European Association for the Study of the Liver (EASL) and the American Association for the Study of Liver Diseases (AASLD) was held in London on September 30 and October 1, 2017. The goals of the meeting were to identify areas of broad agreement and disagreement, develop consensus, and determine future directions to ultimately reduce the burden, morbidity, and mortality of alcohol-related liver disease (previously termed alcoholic liver disease). The specific aims of the meeting were to identify unmet needs and areas for future investigation, in order to reduce alcohol consumption, develop markers for diagnosis and prognosis of disease, and create a framework to test novel pharmacological agents with pre-specified treatment endpoints.
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20
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Zhong Z, Lemasters JJ. A Unifying Hypothesis Linking Hepatic Adaptations for Ethanol Metabolism to the Proinflammatory and Profibrotic Events of Alcoholic Liver Disease. Alcohol Clin Exp Res 2018; 42:2072-2089. [PMID: 30132924 PMCID: PMC6214771 DOI: 10.1111/acer.13877] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 08/13/2018] [Indexed: 02/06/2023]
Abstract
The pathogenesis of alcoholic liver disease (ALD) remains poorly understood but is likely a multihit pathophysiological process. Here, we propose a hypothesis of how early mitochondrial adaptations for alcohol metabolism lead to ALD pathogenesis. Acutely, ethanol (EtOH) feeding causes a near doubling of hepatic EtOH metabolism and oxygen consumption within 2 to 3 hours. This swift increase in alcohol metabolism (SIAM) is an adaptive response to hasten metabolic elimination of both EtOH and its more toxic metabolite, acetaldehyde (AcAld). In association with SIAM, EtOH causes widespread hepatic mitochondrial depolarization (mtDepo), which stimulates oxygen consumption. In parallel, voltage-dependent anion channels (VDAC) in the mitochondrial outer membrane close. Together, VDAC closure and respiratory stimulation promote selective and more rapid oxidation of EtOH first to AcAld in the cytosol and then to nontoxic acetate in mitochondria, since membrane-permeant AcAld does not require VDAC to enter mitochondria. VDAC closure also inhibits mitochondrial fatty acid oxidation and ATP release, promoting steatosis and a decrease in cytosolic ATP. After acute EtOH, these changes revert as EtOH is eliminated with little hepatocellular cytolethality. mtDepo also stimulates mitochondrial autophagy (mitophagy). After chronic high EtOH exposure, the capacity to process depolarized mitochondria by mitophagy becomes compromised, leading to intra- and extracellular release of damaged mitochondria, mitophagosomes, and/or autolysosomes containing mitochondrial damage-associated molecular pattern (mtDAMP) molecules. mtDAMPs cause inflammasome activation and promote inflammatory and profibrogenic responses, causing hepatitis and fibrosis. We propose that persistence of mitochondrial responses to EtOH metabolism becomes a tipping point, which links initial adaptive EtOH metabolism to maladaptive changes initiating onset and progression of ALD.
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Affiliation(s)
- Zhi Zhong
- Department of Drug Discovery & Biomedical Sciences and
| | - John J. Lemasters
- Department of Drug Discovery & Biomedical Sciences and
- Department of Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC 29425
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21
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Posteraro B, Paroni Sterbini F, Petito V, Rocca S, Cubeddu T, Graziani C, Arena V, Vassallo GA, Mosoni C, Lopetuso L, Lorrai I, Maccioni P, Masucci L, Martini C, Gasbarrini A, Sanguinetti M, Colombo G, Addolorato G. Liver Injury, Endotoxemia, and Their Relationship to Intestinal Microbiota Composition in Alcohol-Preferring Rats. Alcohol Clin Exp Res 2018; 42:2313-2325. [PMID: 30320890 DOI: 10.1111/acer.13900] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 10/02/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND There is strong evidence that alcoholism leads to dysbiosis in both humans and animals. However, it is unclear how changes in the intestinal microbiota (IM) relate to ethanol (EtOH)-induced disruption of gut-liver homeostasis. We investigated this issue using selectively bred Sardinian alcohol-preferring (sP) rats, a validated animal model of excessive EtOH consumption. METHODS Independent groups of male adult sP rats were exposed to the standard, home-cage 2-bottle "EtOH (10% v/v) versus water" choice regimen with unlimited access for 24 h/d (Group Et) for 3 (T1), 6 (T2), and 12 (T3) consecutive months. Control groups (Group Ct) were composed of matched-age EtOH-naïve sP rats. We obtained samples from each rat at the end of each experimental time, and we used blood and colon tissues for intestinal barrier integrity and/or liver pathology assessments and used stool samples for IM analysis with 16S ribosomal RNA gene sequencing. RESULTS Rats in Group Et developed hepatic steatosis and elevated serum transaminases and endotoxin/lipopolysaccharide (LPS) levels but no other liver pathological changes (i.e., necrosis/inflammation) or systemic inflammation. While we did not find any apparent alteration of the intestinal colonic mucosa, we found that rats in Group Et exhibited significant changes in IM composition compared to the rats in Group Ct. These changes were sustained throughout T1, T2, and T3. In particular, Ruminococcus, Coprococcus, and Streptococcus were the differentially abundant microbial genera at T3. The KEGG Ortholog profile revealed that IM functional modules, such as biosynthesis, transport, and export of LPS, were also enriched in Group Et rats at T3. CONCLUSIONS We showed that chronic, voluntary EtOH consumption induced liver injury and endotoxemia together with dysbiotic changes in sP rats. This work sets the stage for improving our knowledge of the prevention and treatment of EtOH-related diseases.
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Affiliation(s)
- Brunella Posteraro
- Institute of Medical Pathology and Semeiotics , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesco Paroni Sterbini
- Institute of Microbiology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Valentina Petito
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Stefano Rocca
- Department of Veterinary Medicine , Università di Sassari, Sassari, Italy
| | - Tiziana Cubeddu
- Department of Veterinary Medicine , Università di Sassari, Sassari, Italy
| | - Cristina Graziani
- Alcohol Use Disorder Unit , Department of Medical Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy.,Department of Pathology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Vincenzo Arena
- Department of Pathology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Gabriele A Vassallo
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy.,Alcohol Use Disorder Unit , Department of Medical Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Carolina Mosoni
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Loris Lopetuso
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Irene Lorrai
- Neuroscience Institute , Section of Cagliari, National Research Council of Italy, Monserrato, Cagliari, Italy
| | - Paola Maccioni
- Neuroscience Institute , Section of Cagliari, National Research Council of Italy, Monserrato, Cagliari, Italy
| | - Luca Masucci
- Institute of Microbiology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Cecilia Martini
- Institute of Microbiology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Antonio Gasbarrini
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Maurizio Sanguinetti
- Institute of Microbiology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Giancarlo Colombo
- Neuroscience Institute , Section of Cagliari, National Research Council of Italy, Monserrato, Cagliari, Italy
| | - Giovanni Addolorato
- Division of Hepatology and Gastroenterology , Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy.,Alcohol Use Disorder Unit , Department of Medical Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
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Brown ZJ, Heinrich B, Greten TF. Mouse models of hepatocellular carcinoma: an overview and highlights for immunotherapy research. Nat Rev Gastroenterol Hepatol 2018; 15:536-554. [PMID: 29904153 DOI: 10.1038/s41575-018-0033-6] [Citation(s) in RCA: 139] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Mouse models are the basis of preclinical and translational research in hepatocellular carcinoma (HCC). Multiple methods exist to induce tumour formation in mice, including genetically engineered mouse models, chemotoxic agents, intrahepatic or intrasplenic injection of tumour cells and xenograft approaches. Additionally, as HCC generally develops in the context of diseased liver, methods exist to induce liver disease in mice to mimic viral hepatitis, fatty liver disease, fibrosis, alcohol-induced liver disease and cholestasis. Similar to HCC in humans, response to therapy in mouse models is monitored with imaging modalities such as CT or MRI, as well as additional techniques involving bioluminescence. As immunotherapy is increasingly applied to HCC, mouse models for these approaches are required for preclinical data. In studying cancer immunotherapy, it is important to consider aspects of antitumour immune responses and to produce a model that mimics the complexity of the immune system. This Review provides an overview of the different mouse models of HCC, presenting techniques to prepare an HCC mouse model and discussing different approaches to help researchers choose an appropriate model for a specific hypothesis. Specific aspects of immunotherapy research in HCC and the applied mouse models in this field are also highlighted.
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Affiliation(s)
- Zachary J Brown
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Bernd Heinrich
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Tim F Greten
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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23
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Thompson KJ, Nazari SS, Jacobs WC, Grahame NJ, McKillop IH. Use of a crossed high alcohol preferring (cHAP) mouse model with the NIAAA-model of chronic-binge ethanol intake to study liver injury. Alcohol Alcohol 2018; 52:629-637. [PMID: 29036399 DOI: 10.1093/alcalc/agx063] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/21/2017] [Indexed: 12/13/2022] Open
Abstract
Aims This study sought to compare mice bred to preferentially consume high amounts of alcohol (crossed-high alcohol preferring, cHAP) to c57BL/6 (C57) mice using a chronic-binge ethanol ingestion model to induce alcoholic liver disease (ALD). Methods Male C57 and cHAP mice were randomized to a Lieber-DeCarli control (LDC) diet, Lieber-DeCarli 5% (v/v) ethanol (LDE) diet or free-choice between 10% (v/v) ethanol in drinking water (EtOH-DW) and DW. After 4 weeks mice were gavaged with either 9 g/kg maltose-dextrin (LDC+MD) or 5 g/kg EtOH (LDE+Binge, EtOH-DW+Binge). Nine hours later tissue and serum were collected and analyzed. Results cHAP mice on EtOH-DW consumed significantly more ethanol than cHAP or C57 mice maintained on LDE. However, cHAP and C57 mice on the LDE+Binge regiment had greater hepatosteatosis and overall degree of liver injury compared to EtOH-DW+Binge. Changes in pro-inflammatory gene expression was more pronounced in cHAP mice than C57 mice. Analysis of liver enzymes revealed a robust induction of CYP2E1 in C57 and cHAP mice maintained on EtOH-DW+Binge or LDE+Binge. However, while C57 mice exhibited higher basal hepatic glutathione than cHAP mice, these mice appeared more susceptible to oxidative stress following LDE+Binge than cHAP counterparts. Conclusions Despite cHAP mice consuming more total ethanol prior to gavage when maintained on EtOH-DW, LDE followed by gavage created a more severe model of ALD in both C57 and cHAP mice. These data suggest factors other than total amount of alcohol consumed affect degree of ALD development in the chronic-binge model in cHAP mice. Short Summary cHAP mice voluntarily consume high amounts of ethanol and exhibited hepatic injury when subject to chronic-binge ethanol feeding with the Lieber-DeCarli diet. However, hepatic injury was reduced in cHAP mice in a chronic-binge model following voluntary high ethanol consumption in drinking water.
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Affiliation(s)
- Kyle J Thompson
- Department of Surgery, Carolinas Medical Center, Charlotte, NC 28203, USA
| | - Shayan S Nazari
- Department of Surgery, Carolinas Medical Center, Charlotte, NC 28203, USA.,Department of Biology, UNC at Charlotte, Charlotte, NC 28223, USA
| | - W Carl Jacobs
- Department of Pathology, Carolinas Medical Center, Charlotte, NC 28203, USA
| | - Nicholas J Grahame
- Department of Psychology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Iain H McKillop
- Department of Surgery, Carolinas Medical Center, Charlotte, NC 28203, USA
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24
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Bertola A. WITHDRAWN: Rodent models of fatty liver diseases. LIVER RESEARCH 2018. [DOI: 10.1016/j.livres.2018.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Alcoholic hepatitis is the most severe and acute form of alcoholic liver disease. The mortality rate associated with alcoholic hepatitis is high, largely due to the lack of suitable pharmacological interventions. While there has been substantial research in the area, generating pharmacological interventions has been plagued by the lack of a robust mouse model both for testing and for understanding the underlying pathology. A number of major notable advances have been made in this area recently, with the goal of generating a mouse model of alcoholic hepatitis. The purpose of this article is to review recent advances in modeling alcoholic liver disease both in vitro and in vivo in the mouse, and place them in the context of the greater spectrum of alcoholic liver disease, with a focus on how we can translate current advances into a high-fidelity model of alcoholic hepatitis. In addition, we will review the basic mechanisms of alcoholic hepatitis as it is currently understood, focusing on recent advancements in diagnosis, prognosis and current pathophysiology, especially as it relates to the profound immune dysfunction present during alcoholic hepatitis.
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Affiliation(s)
- Benjamin L. Woolbright
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, Kansas, USA
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26
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27
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Gao B, Zakhari S. Epidemiology and Pathogenesis of Alcoholic Liver Disease. ZAKIM AND BOYER'S HEPATOLOGY 2018:334-344.e3. [DOI: 10.1016/b978-0-323-37591-7.00022-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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28
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Fernando H, Bhopale KK, Kondraganti SS, Kaphalia BS, Ansari GAS. Alcohol-Induced Hepatic Steatosis: A Comparative Study to Identify Possible Indicator(s) of Alcoholic Fatty Liver Disease. ACTA ACUST UNITED AC 2018; 7. [PMID: 31032137 DOI: 10.4303/jdar/236040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Background Fatty liver is an early sign of both nonalcoholic and alcoholic fatty liver diseases. Ethanol feeding using a Lieber-DeCarli liquid diet (LD) model which contains 35% fat to rats or mice is a well-established model for alcoholic fatty liver. However, LD diet alone can also induce fatty liver and its differential metabolic profile may be able to differentiate steatosis induced by LD versus LD plus ethanol. Purpose We investigated the lipidomic differences in the livers of Sprague-Dawley (SD) rats fed a pellet diet (PD), LD and liquid ethanol diet (LED) for six weeks. Study Design Male Sprague Dawley rats were fed with nonalcoholic diets PD, LD or LED (ethanol in LD) for six weeks. Lipids were extracted and analyzed by nuclear magnetic resonance (NMR)- based metabolomics. The NMR data obtained was analyzed by multivariate Principal Component Analysis (PCA) and Spotfire DecisionSite 9.0 software to compare PD versus LD and LD versus LED groups. Results PCA of the NMR spectral data of livers of both comparisons showed a clear separation of PD from LD group and LD from LED group indicating differences in lipid profiles which corresponded with changes in total lipid weights. LD showed increases for cholesterol, esterified cholesterol, cholesterol acetate and triglycerides with decreases for fatty acyl chain, diallylic and allylic protons, while the LED showed increases in esterified cholesterol, cholesterol acetate, fatty acid methyl esters, allylic protons and some triglyceride protons with decreases in free cholesterol and phosphatidylcholine (PC). Conclusion Our data suggest that altered lipid signature or PC levels could be an indicator to differentiate between nonalcoholic versus alcoholic fatty liver.
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Affiliation(s)
- Harshica Fernando
- Department of Chemistry, Prairie View A & M University, 100 University Dr, Prairie View, TX 77446, USA
| | - Kamlesh K Bhopale
- Department of Internal Medicine, The University of Texas Medical Branch at Galveston, Galveston, TX, 77555, USA
| | | | - Bhupendra S Kaphalia
- Department of Pathology, The University of Texas Medical Branch at Galveston, Galveston, TX, 77555, USA
| | - G A Shakeel Ansari
- Department of Pathology, The University of Texas Medical Branch at Galveston, Galveston, TX, 77555, USA
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29
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Abstract
Alcoholic Liver Disease (ALD) refers to damage to the liver due to acute or chronic alcohol abuse. It is among the leading causes of alcohol-related morbidity and mortality and affects more than 2 million people in the United States. A better understanding of the cellular and molecular mechanisms underlying alcohol-induced liver injury is crucial for developing effective treatment for ALD. Zebrafish larvae exhibit hepatic steatosis and fibrogenesis after just 24 h of exposure to 2% ethanol, making them useful for the study of acute alcoholic liver injury. This work describes the procedure for acute ethanol treatment in zebrafish larvae and shows that it causes steatosis and swelling of the hepatic blood vessels. A detailed protocol for Hematoxylin and Eosin (H&E) staining that is optimized for the histological analysis of the zebrafish larval liver, is also described. H&E staining has several unique advantages over immunofluorescence, as it marks all liver cells and extracellular components simultaneously and can readily detect hepatic injury, such as steatosis and fibrosis. Given the increasing usage of zebrafish in modeling toxin and virus-induced liver injury, as well as inherited liver diseases, this protocol serves as a reference for the histological analyses performed in all these studies.
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Affiliation(s)
- Jillian L Ellis
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center
| | - Chunyue Yin
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center; Division of Developmental Biology, Cincinnati Children's Hospital Medical Center;
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30
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Han D, Johnson HS, Rao MP, Martin G, Sancheti H, Silkwood KH, Decker CW, Nguyen KT, Casian JG, Cadenas E, Kaplowitz N. Mitochondrial remodeling in the liver following chronic alcohol feeding to rats. Free Radic Biol Med 2017; 102:100-110. [PMID: 27867097 PMCID: PMC5209270 DOI: 10.1016/j.freeradbiomed.2016.11.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 09/13/2016] [Accepted: 11/10/2016] [Indexed: 02/07/2023]
Abstract
The feeding of alcohol orally (Lieber-DeCarli diet) to rats has been shown to cause declines in mitochondrial respiration (state III), decreased expression of respiratory complexes, and decreased respiratory control ratios (RCR) in liver mitochondria. These declines and other mitochondrial alterations have led to the hypothesis that alcohol feeding causes "mitochondrial dysfunction" in the liver. If oral alcohol feeding leads to mitochondrial dysfunction, one would predict that increasing alcohol delivery by intragastric (IG) alcohol feeding to rats would cause greater declines in mitochondrial bioenergetics in the liver. In this study, we examined the mitochondrial alterations that occur in rats fed alcohol both orally and intragastrically. Oral alcohol feeding decreased glutamate/malate-, acetaldehyde- and succinate-driven state III respiration, RCR, and expression of respiratory complexes (I, III, IV, V) in liver mitochondria, in agreement with previous results. IG alcohol feeding, on the other hand, caused a slight increase in glutamate/malate-driven respiration, and significantly increased acetaldehyde-driven respiration in liver mitochondria. IG feeding also caused liver mitochondria to experience a decline in succinate-driven respiration, but these decreases were smaller than those observed with oral alcohol feeding. Surprisingly, oral and IG alcohol feeding to rats increased mitochondrial respiration using other substrates, including glycerol-3-phosphate (which delivers electrons from cytoplasmic NADH to mitochondria) and octanoate (a substrate for beta-oxidation). The enhancement of glycerol-3-phosphate- and octanoate-driven respiration suggests that liver mitochondria remodeled in response to alcohol feeding. In support of this notion, we observed that IG alcohol feeding also increased expression of mitochondrial glycerol phosphate dehydrogenase-2 (GPD2), transcription factor A (TFAM), and increased mitochondrial NAD+-NADH and NADP+-NADPH levels in the liver. Our findings suggest that mitochondrial dysfunction represents an incomplete picture of mitochondrial dynamics that occur in the liver following alcohol feeding. While alcohol feeding causes some mitochondrial dysfunction (i.e. succinate-driven respiration), our work suggests that the major consequence of alcohol feeding is mitochondrial remodeling in the liver as an adaptation. This mitochondrial remodeling may play an important role in the enhanced alcohol metabolism and other adaptations in the liver that develop with alcohol intake.
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Affiliation(s)
- Derick Han
- Department of Biopharmaceutical Sciences, School of Pharmacy, Keck Graduate Institute, 535 Watson Drive, Claremont, CA 91711, USA.
| | - Heather S Johnson
- University of Southern California Research Center for Liver Diseases and Southern California Research Center for ALPD, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089-9121, USA
| | - Madhuri P Rao
- W.M. Keck Science Department, Scripps College, Claremont, CA 91711, USA
| | - Gary Martin
- Department of Biology, Occidental College, Los Angeles, CA 90041, USA
| | - Harsh Sancheti
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA 90089, USA
| | - Kai H Silkwood
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0303, USA
| | - Carl W Decker
- Department of Biopharmaceutical Sciences, School of Pharmacy, Keck Graduate Institute, 535 Watson Drive, Claremont, CA 91711, USA
| | - Kim Tho Nguyen
- Department of Biopharmaceutical Sciences, School of Pharmacy, Keck Graduate Institute, 535 Watson Drive, Claremont, CA 91711, USA
| | - Joseph G Casian
- Department of Biopharmaceutical Sciences, School of Pharmacy, Keck Graduate Institute, 535 Watson Drive, Claremont, CA 91711, USA
| | - Enrique Cadenas
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA 90089, USA
| | - Neil Kaplowitz
- University of Southern California Research Center for Liver Diseases and Southern California Research Center for ALPD, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089-9121, USA
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Ramaiah S, Rivera C, Arteel G. Early-Phase Alcoholic Liver Disease: An Update on Animal Models, Pathology, and Pathogenesis. Int J Toxicol 2016; 23:217-31. [PMID: 15371166 DOI: 10.1080/10915810490502069] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Alcoholic liver disease (ALD) remains to be one of the most common etiology of liver disease and is a major cause of morbidity and mortality worldwide. The pathologic stages of ALD comprises of steatosis, steatohepatitis, and fibrosis/cirrhosis. Steatosis and steatohepatitis represents the early phase of ALD and are precursor stages for fibrosis/cirrhosis. Numerous research efforts have been directed at recognizing cofactors interacting with alcohol in the pathogenesis of steatosis and steatohepatitis. This review will elucidate the constellation of complex pathogenesis, available animal models, and microscopic pathologic findings mostly in the early-phase of ALD. The role of endotoxin, reactive oxygen species, alcohol metabolism, and cytokines are discussed. Understanding the mechanisms of early-phase ALD should provide insight into the development of therapeutic strategies and thereby decrease the morbidity and mortality associated with ALD.
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Affiliation(s)
- Shashi Ramaiah
- Department of Pathobiology, Texas Veterinary Medical Center, College of Veterinary Medicine, Texas A and M University, College Station, TX 77843, USA
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32
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Ronis MJJ, Hakkak R, Korourian S, Albano E, Yoon S, Ingelman-Sundberg M, Lindros KO, Badger TM. Alcoholic Liver Disease in Rats Fed Ethanol as Part of Oral or Intragastric Low-Carbohydrate Liquid Diets. Exp Biol Med (Maywood) 2016; 229:351-60. [PMID: 15044719 DOI: 10.1177/153537020422900410] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The intragastric administration of ethanol as part of a lowcarbohydrate diet results in alcohol hepatotoxicity. We aimed to investigate whether comparable liver injury can be achieved by oral diet intake. Male Sprague-Dawley rats were fed ethanol as part of low-carbohydrate diets for 36–42 days either intragastrically or orally. Liver pathology, blood ethanol concentration, serum alanine amino transferase (ALT), endotoxin level, hepatic CYP2E1 induction, and cytokine profiles were assessed. Both oral and intragastric low-carbohydrate ethanol diets resulted in marked steatosis with additional inflammation and necrosis accompanied by significantly increased serum ALT, high levels of CYP2E1 expression, and production of auto-antibodies against malondialdehyde and hydroxyethyl free radical protein adducts. However, cytokine profiles differed substantially between the groups, with significantly lower mRNA expression of the anti-inflammatory cytokine interleukin 4 observed in rats fed low-carbohydrate diets orally. Inflammation and necrosis were significantly greater in rats receiving low-carbohydrate alcohol diets intragastrically than orally. This was associated with a significant increase in liver tumor necrosis factor α and interleukin 1β gene expression in the intragastric model. Thus, oral low-carbohydrate diets produce more ethanol-induced liver pathology than oral high-carbohydrate diets, but hepatotoxicity is more severe when a low-carbohydrate diet plus ethanol is infused intragastrically and is accompanied by significant increases in levels of proinflammatory cytokines.
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Affiliation(s)
- Martin J J Ronis
- Department of Pharmacology and Toxicology, UAMS, Arkansas Children's Nutrition Center, Little Rock Arkansas, 72205, USA.
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LPS-TLR4 Pathway Mediates Ductular Cell Expansion in Alcoholic Hepatitis. Sci Rep 2016; 6:35610. [PMID: 27752144 PMCID: PMC5067590 DOI: 10.1038/srep35610] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 09/29/2016] [Indexed: 02/06/2023] Open
Abstract
Alcoholic hepatitis (AH) is the most severe form of alcoholic liver disease for which there are no effective therapies. Patients with AH show impaired hepatocyte proliferation, expansion of inefficient ductular cells and high lipopolysaccharide (LPS) levels. It is unknown whether LPS mediates ductular cell expansion. We performed transcriptome studies and identified keratin 23 (KRT23) as a new ductular cell marker. KRT23 expression correlated with mortality and LPS serum levels. LPS-TLR4 pathway role in ductular cell expansion was assessed in human and mouse progenitor cells, liver slices and liver injured TLR4 KO mice. In AH patients, ductular cell expansion correlated with portal hypertension and collagen expression. Functional studies in ductular cells showed that KRT23 regulates collagen expression. These results support a role for LPS-TLR4 pathway in promoting ductular reaction in AH. Maneuvers aimed at decreasing LPS serum levels in AH patients could have beneficial effects by preventing ductular reaction development.
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Zhang C, Ellis JL, Yin C. Inhibition of vascular endothelial growth factor signaling facilitates liver repair from acute ethanol-induced injury in zebrafish. Dis Model Mech 2016; 9:1383-1396. [PMID: 27562099 PMCID: PMC5117223 DOI: 10.1242/dmm.024950] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 08/16/2016] [Indexed: 12/15/2022] Open
Abstract
Alcoholic liver disease (ALD) results from alcohol overconsumption and is among the leading causes of liver-related morbidity and mortality worldwide. Elevated expression of vascular endothelial growth factor (VEGF) and its receptors has been observed in ALD, but how it contributes to ALD pathophysiology is unclear. Here, we investigated the impact of VEGF signaling inhibition on an established zebrafish model of acute alcoholic liver injury. Kdrl activity was blocked by chemical inhibitor treatment or by genetic mutation. Exposing 4-day-old zebrafish larvae to 2% ethanol for 24 h induced hepatic steatosis, angiogenesis and fibrogenesis. The liver started self-repair once ethanol was removed. Although inhibiting Kdrl did not block the initial activation of hepatic stellate cells during ethanol treatment, it suppressed their proliferation, extracellular matrix protein deposition and fibrogenic gene expression after ethanol exposure, thus enhancing the liver repair. It also ameliorated hepatic steatosis and attenuated hepatic angiogenesis that accelerated after the ethanol treatment. qPCR showed that hepatic stellate cells are the first liver cell type to increase the expression of VEGF ligand and receptor genes in response to ethanol exposure. Both hepatic stellate cells and endothelial cells, but not hepatic parenchymal cells, expressed kdrl upon ethanol exposure and were likely the direct targets of Kdrl inhibition. Ethanol-induced steatosis and fibrogenesis still occurred in cloche mutants that have hepatic stellate cells but lack hepatic endothelial cells, and Kdrl inhibition suppressed both phenotypes in the mutants. These results suggest that VEGF signaling mediates interactions between activated hepatic stellate cells and hepatocytes that lead to steatosis. Our study demonstrates the involvement of VEGF signaling in regulating sustained liver injuries after acute alcohol exposure. It also provides a proof of principle of using the zebrafish model to identify molecular targets for developing ALD therapies.
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Affiliation(s)
- Changwen Zhang
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Jillian L Ellis
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Chunyue Yin
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA .,Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
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Wilkin RJW, Lalor PF, Parker R, Newsome PN. Murine Models of Acute Alcoholic Hepatitis and Their Relevance to Human Disease. THE AMERICAN JOURNAL OF PATHOLOGY 2016; 186:748-60. [PMID: 26835538 DOI: 10.1016/j.ajpath.2015.12.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 11/19/2015] [Accepted: 12/01/2015] [Indexed: 02/07/2023]
Abstract
Alcohol-induced liver damage is a major burden for most societies, and murine studies can provide a means to better understand its pathogenesis and test new therapies. However, there are many models reported with widely differing phenotypes, not all of which fully regenerate the spectrum of human disease. Thus, it is important to understand the implications of these variations to efficiently model human disease. This review critically appraises key articles in the field, detailing the spectrum of liver damage seen in different models, and how they relate to the phenotype of disease seen in patients. A range of different methods of alcohol administration have been studied, ranging from ad libitum consumption of alcohol and water to modified diets (eg, Lieber deCarli liquid diet). Other feeding regimens have taken more invasive routes using intragastric feeding tubes to infuse alcohol directly into the stomach. Notably, models using wild-type mice generally produce a milder phenotype of liver damage than those using genetically modified mice, with the exception of the chronic binge-feeding model. We recommend panels of tests for consideration to standardize end points for the evaluation of the severity of liver damage-key for comparison of models of injury, testing of new therapies, and subsequent translation of findings into clinical practice.
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Affiliation(s)
- Richard J W Wilkin
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver Research, University of Birmingham, Birmingham, United Kingdom; Liver Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, United Kingdom.
| | - Patricia F Lalor
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver Research, University of Birmingham, Birmingham, United Kingdom; Liver Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, United Kingdom
| | - Richard Parker
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver Research, University of Birmingham, Birmingham, United Kingdom; Liver Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, United Kingdom
| | - Philip N Newsome
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver Research, University of Birmingham, Birmingham, United Kingdom; Liver Unit, University Hospital Birmingham NHS Foundation Trust, Birmingham, United Kingdom.
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Bhopale KK, Kondraganti S, Fernando H, Boor PJ, Kaphalia BS, Shakeel Ansari GA. Alcoholic Steatosis in Different Strains of Rat: A Comparative Study. ACTA ACUST UNITED AC 2015; 4. [PMID: 27213081 PMCID: PMC4874529 DOI: 10.4303/jdar/235912] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Background Different strains of rats have been used to study alcoholic liver disease (ALD) while the reason for selecting a particular rat strain was not apparent. Purpose The aim of our study was to compare outbred (Wistar) and inbred (Fischer) strains to evaluate pathological, biochemical changes, and gene expression differences associated with ethanol-induced early hepatic steatosis. Study Design Male Wistar and Fischer-344 rats were pair-fed for 6 weeks with or without 5% ethanol in Lieber-DeCarli liquid diet. Livers were analyzed for histological and lipid-related differences. Results Hepatic midzonal steatosis was mainly found in Wistar rats while Fischer rats showed mostly pericentral steatosis. Increased hepatic steatosis in ethanol-fed Wistar rats is supported by increases in lipids with related genes and transcription factors involved in fatty acid and triglyceride synthesis. Conclusion Our data showed that Fischer rats are relatively less prone to ethanol-mediated steatosis with pericentral lipid deposition pattern in the liver which is similar to humans and show no trace level of lipid accumulation in pair-fed controls as observed in Wistar (outbred) strain. Therefore, Fischer rats are better suited for lipid studies in an early development of ALD.
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Affiliation(s)
- Kamlesh K Bhopale
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Shakuntala Kondraganti
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Harshica Fernando
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Paul J Boor
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Bhupendra S Kaphalia
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - G A Shakeel Ansari
- Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA
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Lin JN, Chang LL, Lai CH, Lin KJ, Lin MF, Yang CH, Lin HH, Chen YH. Development of an Animal Model for Alcoholic Liver Disease in Zebrafish. Zebrafish 2015; 12:271-80. [PMID: 25923904 DOI: 10.1089/zeb.2014.1054] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Alcoholic liver disease (ALD) continues to be a major cause of liver-related morbidity and mortality worldwide. To date, no zebrafish animal model has demonstrated the characteristic manifestations of ALD in the setting of chronic alcohol exposure. The aim of this study was to develop a zebrafish animal model for ALD. Male adult zebrafish were housed in a 1% (v/v) ethanol solution up to 3 months. A histopathological study showed the characteristic features of alcoholic liver steatosis and steatohepatitis in the early stages of alcohol exposure, including fat droplet accumulation, ballooning degeneration of the hepatocytes, and Mallory body formation. As the exposure time increased, collagen deposition in the extracellular matrix was observed by Sirius red staining and immunofluorescence staining. Finally, anaplastic hepatocytes with pleomorphic nuclei were arranged in trabecular patterns and formed nodules in the zebrafish liver. Over the time course of 1% ethanol exposure, upregulations of lipogenesis, fibrosis, and tumor-related genes were also revealed by semiquantitative and quantitative real-time reverse transcription-polymerase chain reaction. As these data reflect characteristic liver damage by alcohol in humans, this zebrafish animal model may serve as a powerful tool to study the pathogenesis and treatment of ALD and its related disorders in humans.
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Affiliation(s)
- Jiun-Nong Lin
- 1 Department of Critical Care Medicine, E-Da Hospital, I-Shou University , Kaohsiung, Taiwan .,2 School of Medicine, College of Medicine, I-Shou University , Kaohsiung, Taiwan .,3 Division of Infectious Diseases, Department of Internal Medicine, E-Da Hospital, I-Shou University , Kaohsiung, Taiwan
| | - Lin-Li Chang
- 4 Department of Microbiology, Faculty of Medicine, Kaohsiung Medical University , Kaohsiung, Taiwan
| | - Chung-Hsu Lai
- 3 Division of Infectious Diseases, Department of Internal Medicine, E-Da Hospital, I-Shou University , Kaohsiung, Taiwan
| | - Kai-Jen Lin
- 5 Department of Pathology, I-Shou University , Kaohsiung, Taiwan
| | - Mei-Fang Lin
- 6 Department of Pharmacy, E-Da Hospital, I-Shou University , Kaohsiung, Taiwan
| | - Chih-Hui Yang
- 7 General Education Center, Meiho University , Pingtung, Taiwan
| | - Hsi-Hsun Lin
- 3 Division of Infectious Diseases, Department of Internal Medicine, E-Da Hospital, I-Shou University , Kaohsiung, Taiwan
| | - Yen-Hsu Chen
- 8 School of Medicine, College of Medicine, Kaohsiung Medical University , Kaohsiung, Taiwan .,9 Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital , Kaohsiung, Taiwan .,10 Department of Biological Science and Technology, College of Biological Science and Technology, National Chiao Tung University, HsinChu, Taiwan
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Abstract
Alcoholic liver disease (ALD) is a complex process that includes a wide spectrum of hepatic lesions, from steatosis to cirrhosis. Cell injury, inflammation, oxidative stress, regeneration and bacterial translocation are key drivers of alcohol-induced liver injury. Alcoholic hepatitis is the most severe form of all the alcohol-induced liver lesions. Animal models of ALD mainly involve mild liver damage (that is, steatosis and moderate inflammation), whereas severe alcoholic hepatitis in humans occurs in the setting of cirrhosis and is associated with severe liver failure. For this reason, translational studies using humans and human samples are crucial for the development of new therapeutic strategies. Although multiple attempts have been made to improve patient outcome, the treatment of alcoholic hepatitis is still based on abstinence from alcohol and brief exposure to corticosteroids. However, nearly 40% of patients with the most severe forms of alcoholic hepatitis will not benefit from treatment. We suggest that future clinical trials need to focus on end points other than mortality. This Review discusses the main pathways associated with the progression of liver disease, as well as potential therapeutic strategies targeting these pathways.
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Wang Q, Dai X, Yang W, Wang H, Zhao H, Yang F, Yang Y, Li J, Lv X. Caffeine protects against alcohol-induced liver fibrosis by dampening the cAMP/PKA/CREB pathway in rat hepatic stellate cells. Int Immunopharmacol 2015; 25:340-52. [PMID: 25701503 DOI: 10.1016/j.intimp.2015.02.012] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 01/26/2015] [Accepted: 02/09/2015] [Indexed: 12/20/2022]
Abstract
Alcoholic liver fibrosis (ALF) is characterized by hyperplasia of extracellular matrix under long-term alcohol stimulation. Hepatic stellate cell (HSC) activation plays an important role in promoting hepatic fibrogenesis. Caffeine, as the main active component of coffee and tea, was widely consumed in daily life. It was always a thought that caffeine can reduce the probability of suffering from liver diseases. In this study, we attempt to validate the hypothesis that caffeine inhibits activation of HSCs which were isolated from rat ALF model. The rats were gavaged by ethanol to establish ALF model and then treated with different concentrations of caffeine or colchicine. Serum was collected to measure the contents of serum alanine aminotransferase (ALT), aspartate transaminase (AST), hyaluronic acid (HA), laminin (LN), N-terminal peptide of type III procollagen (PIIINP) and type IV collagen (CIV). Then liver tissues were obtained for hematoxylin-eosin staining and Sirius-red staining. Others were treated through liver perfusion to isolate primary rat HSCs. Interestingly, we found that caffeine significantly decreased ALT, AST, HA, LN, PIIINP and CIV levels and reversed liver fibrosis in rat ALF models. Results of immunohistochemistry, real-time PCR and western blot indicated that caffeine could reduce fibrosis and inhibit cAMP/PKA/CREB signal pathway in HSC. Caffeine has a preventive effect on ALF. The mechanism may be interpreted that caffeine inhibits the cAMP/PKA/CREB signal pathway through adenosine A2A receptors in HSC.
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Affiliation(s)
- Qi Wang
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China.
| | - Xuefei Dai
- The Fourth Affiliated Hospital of Anhui Medical University, Tun Xi Road, Hefei, Anhui Province, 230000, China
| | - Wanzhi Yang
- The First Hospital of Anqing, Xiao Su Road, Anqing, Anhui Province, 246003, China
| | - He Wang
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China
| | - Han Zhao
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China
| | - Feng Yang
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China
| | - Yan Yang
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China
| | - Jun Li
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China
| | - Xiongwen Lv
- School of Pharmacy, Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China; Institute for Liver Disease of Anhui Medical University, Mei Shan Road, Hefei, Anhui Province, 230032, China.
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Kim HG, Kim JM, Han JM, Lee JS, Choi MK, Lee DS, Park YH, Son CG. Chunggan extract, a traditional herbal formula, ameliorated alcohol-induced hepatic injury in rat model. World J Gastroenterol 2014; 20:15703-15714. [PMID: 25400454 PMCID: PMC4229535 DOI: 10.3748/wjg.v20.i42.15703] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Revised: 05/14/2014] [Accepted: 06/23/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate protective effects of Chunggan extract (CGX), a traditional herbal formula, under 4 wk of alcohol consumption-induced liver injury.
METHODS: Male Sprague-Dawley Rats were orally administered 30% ethanol daily for 4 wk with or without CGX. The pharmaceutical properties were assessed through liver enzymes, histopathology, fibrogenic cytokines, and alcohol metabolism in hepatic tissues as well as by in vitro experiment using HSC-T6 cells.
RESULTS: Four weeks of alcohol consumption notably increased liver enzymes and malondialdehyde levels in serum and hepatic tissue. CGX not only prevented the collagen deposition determined by histopathology and hydroxyproline content, but also normalized transforming growth factor-beta, platelet-derived growth factor-beta and connective tissue growth factor at the gene expression and protein levels in liver tissue. Moreover, CGX treatment also significantly normalized the abnormal changes in gene expression profiles of extracellular matrix proteins, matrix metalloproteinase and their inhibitors, alcohol metabolism, and inflammatory reactions. In the acetaldehyde-stimulated HSC-T6 cells, CGX considerably inhibited collagen production and normalized fibrogenic cytokines in both gene expression and protein levels.
CONCLUSION: The present study evidenced that CGX has hepatoprotective properties via modulation of fibrogenic cytokines and alcohol metabolism in alcoholic liver injury.
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Williams JA, Manley S, Ding WX. New advances in molecular mechanisms and emerging therapeutic targets in alcoholic liver diseases. World J Gastroenterol 2014; 20:12908-12933. [PMID: 25278688 PMCID: PMC4177473 DOI: 10.3748/wjg.v20.i36.12908] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 03/07/2014] [Accepted: 04/16/2014] [Indexed: 02/06/2023] Open
Abstract
Alcoholic liver disease is a major health problem in the United States and worldwide. Chronic alcohol consumption can cause steatosis, inflammation, fibrosis, cirrhosis and even liver cancer. Significant progress has been made to understand key events and molecular players for the onset and progression of alcoholic liver disease from both experimental and clinical alcohol studies. No successful treatments are currently available for treating alcoholic liver disease; therefore, development of novel pathophysiological-targeted therapies is urgently needed. This review summarizes the recent progress on animal models used to study alcoholic liver disease and the detrimental factors that contribute to alcoholic liver disease pathogenesis including miRNAs, S-adenosylmethionine, Zinc deficiency, cytosolic lipin-1β, IRF3-mediated apoptosis, RIP3-mediated necrosis and hepcidin. In addition, we summarize emerging adaptive protective effects induced by alcohol to attenuate alcohol-induced liver pathogenesis including FoxO3, IL-22, autophagy and nuclear lipin-1α.
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Global metabolic profiling for the study of alcohol-related disorders. Bioanalysis 2014; 6:59-77. [PMID: 24341495 DOI: 10.4155/bio.13.301] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Alcohol-related disorders are multifaceted since ethanol can induce profound metabolic perturbations when taken in excess. Global metabolic profiling strategies may aid the understanding of ethanol-related effects by shedding light on these metabolic changes and potentially revealing unknown mechanisms of ethanol toxicity. Here an overview of studies designed to explore the effects of alcohol (ethanol) consumption using holistic metabolite profiling approaches (metabonomics/metabolomics) is presented, demonstrating the potential of this methodology. The analytical technologies used (NMR, GC-MS and LC-MS), have been applied to the profiling of serum, plasma, urine and tissues, obtained from animal models or humans, after exposure to alcohol. From the metabolic profiling data of a range of biological samples, a number of endogenous metabolites have been proposed as potential ethanol consumption-related biomarkers. The biomarkers suggested by these studies, and the biochemical insights that they provide for understanding the effects of ethanol mechanisms of toxicity, are discussed.
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Mathews S, Xu M, Wang H, Bertola A, Gao B. Animals models of gastrointestinal and liver diseases. Animal models of alcohol-induced liver disease: pathophysiology, translational relevance, and challenges. Am J Physiol Gastrointest Liver Physiol 2014; 306:G819-23. [PMID: 24699333 PMCID: PMC4024729 DOI: 10.1152/ajpgi.00041.2014] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Over the last four decades, chronic ethanol feeding studies in rodents using either ad libitum feeding or intragastric infusion models have significantly enhanced our understanding of the pathogenesis of alcoholic liver disease (ALD). Recently, we developed a chronic plus binge alcohol feeding model in mice that is similar to the drinking patterns of many alcoholic hepatitis patients: a history of chronic drinking and recent excessive alcohol consumption. Chronic+binge ethanol feeding synergistically induced steatosis, liver injury, and neutrophil infiltration in mice, which may be useful for the study of early alcoholic liver injury and inflammation. Using this chronic+binge model, researchers have begun to identify novel mechanisms that participate in the pathogenesis of alcoholic liver injury, thereby revealing novel therapeutic targets. In this review article, we briefly discuss several mouse models of ALD with a focus on the chronic+binge ethanol feeding model.
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Affiliation(s)
| | | | | | | | - Bin Gao
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland
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The effect of inflammatory cytokines in alcoholic liver disease. Mediators Inflamm 2013; 2013:495156. [PMID: 24385684 PMCID: PMC3872233 DOI: 10.1155/2013/495156] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Accepted: 11/12/2013] [Indexed: 02/06/2023] Open
Abstract
Alcohol is the most common cause of liver disease in the world. Chronic alcohol consumption leads to hepatocellular injury and liver inflammation. Inflammatory cytokines, such as TNF-α and IFN-γ, induce liver injury in the rat model of alcoholic liver disease (ALD). Hepatoprotective cytokines, such as IL-6, and anti-inflammatory cytokines, such as IL-10, are also associated with ALD. IL-6 improves ALD via activation of the signal transducer and activator of transcription 3 (STAT3) and the subsequent induction of a variety of hepatoprotective genes in hepatocytes. IL-10 inhibits alcoholic liver inflammation via activation of STAT3 in Kupffer cells and the subsequent inhibition of liver inflammation. Alcohol consumption promotes liver inflammation by increasing translocation of gut-derived endotoxins to the portal circulation and activating Kupffer cells through the LPS/Toll-like receptor (TLR) 4 pathways. Oxidative stress and microflora products are also associated with ALD. Interactions between pro- and anti-inflammatory cytokines and other cytokines and chemokines are likely to play important roles in the development of ALD. The present study aims to conduct a systemic review of ALD from the aspect of inflammation.
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Li HH, Doiron K, Patterson AD, Gonzalez FJ, Fornace AJ. Identification of serum insulin-like growth factor binding protein 1 as diagnostic biomarker for early-stage alcohol-induced liver disease. J Transl Med 2013; 11:266. [PMID: 24152801 PMCID: PMC4016206 DOI: 10.1186/1479-5876-11-266] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 10/18/2013] [Indexed: 12/12/2022] Open
Abstract
Background Alcohol consumption is a major cause of liver disease in humans. The use and monitoring of biomarkers associated with early, pre-clinical stages of alcohol-induced liver disease (pre-ALD) could facilitate diagnosis and treatment, leading to improved outcomes. Methods We investigated the pathological, transcriptomic and protein changes in early stages of pre-ALD in mice fed the Lieber-Decarli liquid diet with or without alcohol for four months to identify biomarkers for the early stage of alcohol induced liver injury. Mice were sampled after 1, 2 and 4 months treatment. Results Pathological examination revealed a modest increase in fatty liver changes in alcohol-treated mice. Transcriptomics revealed gene alterations at all time points. Most notably, the Igfbp1 (Insulin-Like Growth Factor Binding Protein 1) was selected as the best candidate gene for early detection of liver damage since it showed early and continuously enhanced induction during the treatment course. Consistent with the microarray data, both Igfbp1mRNA expression in the liver tissue and the IGFBP1 serum protein levels showed progressive and significant increases over the course of pre-ALD development. Conclusions The results suggest that in conjunction with other tests, serum IGFBPI protein could provide an easily measured biomarker for early detection of alcohol-induced liver injury in humans.
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Affiliation(s)
| | | | | | | | - Albert J Fornace
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, 3970 Reservoir Road, NW, New Research Building, Room E504, Washington, DC 20057, USA.
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In vitro and in vivo models of non-alcoholic fatty liver disease (NAFLD). Int J Mol Sci 2013; 14:11963-80. [PMID: 23739675 PMCID: PMC3709766 DOI: 10.3390/ijms140611963] [Citation(s) in RCA: 169] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 05/17/2013] [Accepted: 05/22/2013] [Indexed: 12/28/2022] Open
Abstract
By now, non-alcoholic fatty liver disease (NAFLD) is considered to be among the most common liver diseases world-wide. NAFLD encompasses a broad spectrum of pathological conditions ranging from simple steatosis to steatohepatitis, fibrosis and finally even cirrhosis; however, only a minority of patients progress to end-stages of the disease, and the course of the disease progression to the later stages seems to be slow, developing progressively over several years. Key risk factors including overweight, insulin resistance, a sedentary life-style and an altered dietary pattern, as well as genetic factors and disturbances of the intestinal barrier function have been identified in recent years. Despite intense research efforts that lead to the identification of these risk factors, knowledge about disease initiation and molecular mechanisms involved in progression is still limited. This review summarizes diet-induced and genetic animal models, as well as cell culture models commonly used in recent years to add to the understanding of the mechanisms involved in NAFLD, also referring to their advantages and disadvantages.
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Liu Y, Meyer C, Xu C, Weng H, Hellerbrand C, ten Dijke P, Dooley S. Animal models of chronic liver diseases. Am J Physiol Gastrointest Liver Physiol 2013; 304:G449-68. [PMID: 23275613 DOI: 10.1152/ajpgi.00199.2012] [Citation(s) in RCA: 139] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chronic liver diseases are frequent and potentially life threatening for humans. The underlying etiologies are diverse, ranging from viral infections, autoimmune disorders, and intoxications (including alcohol abuse) to imbalanced diets. Although at early stages of disease the liver regenerates in the absence of the insult, advanced stages cannot be healed and may require organ transplantation. A better understanding of underlying mechanisms is mandatory for the design of new drugs to be used in clinic. Therefore, rodent models are being developed to mimic human liver disease. However, no model to date can completely recapitulate the "corresponding" human disorder. Limiting factors are the time frame required in humans to establish a certain liver disease and the fact that rodents possess a distinct immune system compared with humans and have different metabolic rates affecting liver homeostasis. These features account for the difficulties in developing adequate rodent models for studying disease progression and for testing new pharmaceuticals to be translated into the clinic. Nevertheless, traditional and new promising animal models that mimic certain attributes of chronic liver diseases are established and being used to deepen our understanding in the underlying mechanisms of distinct liver diseases. This review aims at providing a comprehensive overview of recent advances in animal models recapitulating different features and etiologies of human liver diseases.
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Affiliation(s)
- Yan Liu
- Department of Medicine II, Section Molecular Hepatology-Alcohol Associated Diseases, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
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Abstract
Chronic alcohol consumption is a leading cause of chronic liver disease worldwide, leading to cirrhosis and hepatocellular carcinoma. Currently, the most widely used model for alcoholic liver injury is ad libitum feeding with the Lieber-DeCarli liquid diet containing ethanol for 4-6 weeks; however, this model, without the addition of a secondary insult, only induces mild steatosis, slight elevation of serum alanine transaminase (ALT) and little or no inflammation. Here we describe a simple mouse model of alcoholic liver injury by chronic ethanol feeding (10-d ad libitum oral feeding with the Lieber-DeCarli ethanol liquid diet) plus a single binge ethanol feeding. This protocol for chronic-plus-single-binge ethanol feeding synergistically induces liver injury, inflammation and fatty liver, which mimics acute-on-chronic alcoholic liver injury in patients. This feeding protocol can also be extended to chronic feeding for longer periods of time up to 8 weeks plus single or multiple binges. Chronic-binge ethanol feeding leads to high blood alcohol levels; thus, this simple model will be very useful for the study of alcoholic liver disease (ALD) and of other organs damaged by alcohol consumption.
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Han D, Ybanez MD, Johnson HS, McDonald JN, Mesropyan L, Sancheti H, Martin G, Martin A, Lim AM, Dara L, Cadenas E, Tsukamoto H, Kaplowitz N. Dynamic adaptation of liver mitochondria to chronic alcohol feeding in mice: biogenesis, remodeling, and functional alterations. J Biol Chem 2012; 287:42165-79. [PMID: 23086958 DOI: 10.1074/jbc.m112.377374] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Liver mitochondria undergo dynamic alterations following chronic alcohol feeding to mice. Intragastric alcohol feeding to mice resulted in 1) increased state III respiration (109% compared with control) in isolated liver mitochondria, probably due to increased levels of complexes I, IV, and V being incorporated into the respiratory chain; 2) increased mitochondrial NAD(+) and NADH levels (∼2-fold), with no change in the redox status; 3) alteration in mitochondrial morphology, with increased numbers of elongated mitochondria; and 4) enhanced mitochondrial biogenesis in the liver, which corresponded with an up-regulation of PGC-1α (peroxisome proliferator-activated receptor γ coactivator-1α). Oral alcohol feeding to mice, which is associated with less liver injury and steatosis, slightly enhanced respiration in isolated liver mitochondria (30.8% compared with control), lower than the striking increase caused by intragastric alcohol feeding. Mitochondrial respiration increased with both oral and intragastric alcohol feeding despite extensive N-acetylation of mitochondrial proteins. The alcohol-induced mitochondrial alterations are probably an adaptive response to enhance alcohol metabolism in the liver. Isolated liver mitochondria from alcohol-treated mice had a greater rate of acetaldehyde metabolism and respiration when treated with acetaldehyde than control. Aldehyde dehydrogenase-2 levels were unaltered in response to alcohol, suggesting that the greater acetaldehyde metabolism by isolated mitochondria from alcohol-treated mice was due to increased mitochondrial respiration that regenerated NAD(+), the rate-limiting substrate in alcohol/acetaldehyde metabolism. Overall, our work suggests that mitochondrial plasticity in the liver may be an important adaptive response to the metabolic stress caused by alcohol intake and could potentially play a role in many other vital functions performed by the liver.
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Affiliation(s)
- Derick Han
- University of Southern California Research Center for Liver Diseases and Southern California Research Center for Alcoholic Liver and Pancreatic Diseases, Keck School of Medicine, University of Southern California, Los Angeles, California 90089-9121, USA.
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Derdak Z, Villegas KA, Wands JR. Early growth response-1 transcription factor promotes hepatic fibrosis and steatosis in long-term ethanol-fed Long-Evans rats. Liver Int 2012; 32:761-70. [PMID: 22292946 PMCID: PMC10026596 DOI: 10.1111/j.1478-3231.2012.02752.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Accepted: 12/28/2011] [Indexed: 12/30/2022]
Abstract
BACKGROUND Previous studies demonstrated that the Long-Evans (LE) rats exhibited liver injury and lipid metabolic abnormalities after 8 weeks of ethanol feeding. AIMS The goal of this study was to investigate if the LE rats develop more advanced hepatic abnormalities (e.g., fibrosis) after long-term feeding with an ethanol-containing Lieber-DeCarli diet. In addition, the contribution of early growth response-1 (EGR1) transcription factor to these pathological changes was assessed. METHODS Long-Evans rats were fed an ethanol-containing or isocaloric control liquid diet for 18 months. Livers were processed for histological analyses, studies of fibrosis-related gene expression, cell fractionation and triglyceride measurement. Serum alanine aminotransferase (ALT) levels were assessed. DNA binding activities of p53 and the sterol regulatory element-binding protein-1c (SREBP1c) were analysed. The abundance of EGR1 and enzymes involved in fatty acid synthesis were determined. Chromatin immunoprecipitation was employed to study EGR1 binding to the SREBP1c promoter region. RESULTS Ethanol feeding generated steatosis, chicken wire fibrosis and ALT elevations in the LE rats. Fibrosis was associated with the upregulation of EGR1 and its downstream target genes. EGR1 upregulation was associated with enhanced p53 activity and an increase in the cellular p66(shc) abundance. Steatosis was linked to the activation of SREBP1c. Importantly, EGR1 upregulation paralleled the expression and transcriptional activity of SREBP1c. Finally, EGR1 was shown to bind to the SREBP1c promoter region. CONCLUSIONS Long-term ethanol feeding promoted steatosis and fibrosis in LE rats via EGR1 activation. The highly abundant EGR1 bound to the SREBP1c promoter and contributed to the steatosis observed in the LE rat model.
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Affiliation(s)
- Zoltan Derdak
- Division of Gastroenterology & Liver Research Center, Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI, USA.
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