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Oliva-Vilarnau N, Vorrink SU, Büttner FA, Heinrich T, Sensbach J, Koscielski I, Wienke D, Petersson C, Perrin D, Lauschke VM. Comparative analysis of YAP/TEAD inhibitors in 2D and 3D cultures of primary human hepatocytes reveals a novel non-canonical mechanism of CYP induction. Biochem Pharmacol 2023; 215:115755. [PMID: 37607620 DOI: 10.1016/j.bcp.2023.115755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/16/2023] [Accepted: 08/16/2023] [Indexed: 08/24/2023]
Abstract
Induction of cytochrome P450 (CYP) genes constitutes an important cause of drug-drug interactions and preclinical evaluation of induction liability is mandatory for novel drug candidates. YAP/TEAD signaling has emerged as an attractive target for various oncological indications and multiple chemically distinct YAP/TEAD inhibitors are rapidly progressing towards clinical stages. Here, we tested the liability for CYP induction of a diverse set of YAP/TEAD inhibitors with different modes of action and TEAD isoform selectivity profiles in monolayers and 3D spheroids of primary human hepatocytes (PHH). We found that YAP/TEAD inhibition resulted in broad induction of CYPs in 2D monolayers, whereas, if at all, only marginal induction was seen in spheroid culture. Comprehensive RNA-Seq indicated that YAP/TEAD signaling was increased in 2D culture compared to spheroids, which was paralleled by elevated activities of the interacting transcription factors LXR and ESRRA, likely at least in part due to altered mechanosensing. Inhibition of this YAP/TEAD hyperactivation resulted in an overall reduction of hepatocyte dedifferentiation marked by increased hepatic functionality, including CYPs. These results thus demonstrate that the observed induction is due to on-target effects of the compounds rather than direct activation of xenobiotic sensing nuclear receptors. Combined, the presented data link hepatocyte dedifferentiation to YAP/TEAD dysregulation, reveal a novel non-canonical pathway of CYP induction and highlight the advantage of organotypic 3D cultures to predict clinically relevant pharmacokinetic properties, particularly for atypical induction mechanisms.
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Affiliation(s)
- Nuria Oliva-Vilarnau
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | | | - Florian A Büttner
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart, Germany; University of Tuebingen, Tuebingen, Germany
| | - Timo Heinrich
- Department of Medicinal Chemistry and Drug Design, The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Janike Sensbach
- Department of Chemical and Pre-Clinical Safety, The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Isabel Koscielski
- Department of Chemical and Pre-Clinical Safety, The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Dirk Wienke
- Department of Drug Metabolism and Pharmacokinetics (DMPK), The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Carl Petersson
- Department of Drug Metabolism and Pharmacokinetics (DMPK), The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Dominique Perrin
- Department of Drug Metabolism and Pharmacokinetics (DMPK), The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | - Volker M Lauschke
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; HepaPredict AB, Stockholm, Sweden; Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart, Germany; University of Tuebingen, Tuebingen, Germany.
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Abstract
The epidemic of obesity, type 2 diabetes and nonalcoholic liver disease (NAFLD) favors drug consumption, which augments the risk of adverse events including liver injury. For more than 30 years, a series of experimental and clinical investigations reported or suggested that the common pain reliever acetaminophen (APAP) could be more hepatotoxic in obesity and related metabolic diseases, at least after an overdose. Nonetheless, several investigations did not reproduce these data. This discrepancy might come from the extent of obesity and steatosis, accumulation of specific lipid species, mitochondrial dysfunction and diabetes-related parameters such as ketonemia and hyperglycemia. Among these factors, some of them seem pivotal for the induction of cytochrome P450 2E1 (CYP2E1), which favors the conversion of APAP to the toxic metabolite N-acetyl-p-benzoquinone imine (NAPQI). In contrast, other factors might explain why obesity and NAFLD are not always associated with more frequent or more severe APAP-induced acute hepatotoxicity, such as increased volume of distribution in the body, higher hepatic glucuronidation and reduced CYP3A4 activity. Accordingly, the occurrence and outcome of APAP-induced liver injury in an obese individual with NAFLD would depend on a delicate balance between metabolic factors that augment the generation of NAPQI and others that can mitigate hepatotoxicity.
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Wang C, Gao N, Yang L, Guo Y, Fang Y, Wang T, Xu C, Li GF, Zhou J, Zhang Y, Wen Q, Qiao H. Stat4 rs7574865 polymorphism promotes the occurrence and progression of hepatocellular carcinoma via the Stat4/CYP2E1/FGL2 pathway. Cell Death Dis 2022; 13:130. [PMID: 35136014 PMCID: PMC8826371 DOI: 10.1038/s41419-022-04584-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 01/06/2022] [Accepted: 01/20/2022] [Indexed: 12/25/2022]
Abstract
Although there are many studies on the relationship between genetic polymorphisms and the incidence of diseases, mechanisms are rarely known. We report the mechanism by which signal transducer and activator of transcription 4 (stat4) rs7574865 promotes the occurrence and progression of hepatocellular carcinoma (HCC). We found that the GG genotype at stat4 rs7574865 was a risk genotype, and STAT4 levels in serum and peritumoral tissue from HCC patients with the GG genotype were significantly higher than those found in TT or TG carriers. Furthermore, HCC patients with the GG genotype or elevated STAT4 levels had poor prognoses. In vitro experiments demonstrated that STAT4 silencing promoted apoptosis and inhibited the invasion and migration of HepG2 and L02 cells. Proteomic analysis of HCC peritumors identified 273 proteins related to STAT4, of which CYP2E1 activity and FGL2 content exhibited the highest positive correlation. The relationship between CYP2E1 and FGL2 was also confirmed in cyp2e1−/− mice and in CYP2E1 inhibitor-treated mice. In conclusion, this study elucidates the mechanism by which the stat4 rs7574865 polymorphism promotes the occurrence and progression of HCC via the Stat4/CYP2E1/FGL2 pathway.
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Affiliation(s)
- Caie Wang
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China.,Department of Pharmacy, the First Affiliated Hospital of Henan University of Science and Technology, Clinical Medical College of Henan University of Science and Technology, Luoyang, Henan, China
| | - Na Gao
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Lukui Yang
- Department of Pharmacy, the First Affiliated Hospital of Henan University of Science and Technology, Clinical Medical College of Henan University of Science and Technology, Luoyang, Henan, China
| | - Yuanyuan Guo
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Yan Fang
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Tong Wang
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Chen Xu
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Gui Fang Li
- Department of Pharmacy, the First Affiliated Hospital of Henan University of Science and Technology, Clinical Medical College of Henan University of Science and Technology, Luoyang, Henan, China
| | - Jun Zhou
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Yunfei Zhang
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Qiang Wen
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China
| | - Hailing Qiao
- Institute of Clinical Pharmacology, School of Medicine, Zhengzhou University, Zhengzhou, Henan, China.
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Role of Mitochondrial Cytochrome P450 2E1 in Healthy and Diseased Liver. Cells 2022; 11:cells11020288. [PMID: 35053404 PMCID: PMC8774478 DOI: 10.3390/cells11020288] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/05/2022] [Accepted: 01/11/2022] [Indexed: 12/14/2022] Open
Abstract
Cytochrome P450 2E1 (CYP2E1) is pivotal in hepatotoxicity induced by alcohol abuse and different xenobiotics. In this setting, CYP2E1 generates reactive metabolites inducing oxidative stress, mitochondrial dysfunction and cell death. In addition, this enzyme appears to play a role in the progression of obesity-related fatty liver to nonalcoholic steatohepatitis. Indeed, increased CYP2E1 activity in nonalcoholic fatty liver disease (NAFLD) is deemed to induce reactive oxygen species overproduction, which in turn triggers oxidative stress, necroinflammation and fibrosis. In 1997, Avadhani’s group reported for the first time the presence of CYP2E1 in rat liver mitochondria, and subsequent investigations by other groups confirmed that mitochondrial CYP2E1 (mtCYP2E1) could be found in different experimental models. In this review, we first recall the main features of CYP2E1 including its role in the biotransformation of endogenous and exogenous molecules, the regulation of its expression and activity and its involvement in different liver diseases. Then, we present the current knowledge on the physiological role of mtCYP2E1, its contribution to xenobiotic biotransformation as well as the mechanism and regulation of CYP2E1 targeting to mitochondria. Finally, we discuss experimental investigations suggesting that mtCYP2E1 could have a role in alcohol-associated liver disease, xenobiotic-induced hepatotoxicity and NAFLD.
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Renu K, Subramaniam MD, Chakraborty R, Myakala H, Iyer M, Bharathi G, Siva K, Vellingiri B, Valsala Gopalakrishnan A. The role of Interleukin-4 in COVID-19 associated male infertility - A hypothesis. J Reprod Immunol 2020; 142:103213. [PMID: 33080435 PMCID: PMC7526609 DOI: 10.1016/j.jri.2020.103213] [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: 07/29/2020] [Revised: 09/19/2020] [Accepted: 09/24/2020] [Indexed: 12/11/2022]
Abstract
COVID-19 is a present-day complex pandemic infection with unpredictable levels of morbidity and mortality in various global populations. COVID-19 is associated with the different comorbidities with its change in biological function such as causing heart dysfunction via deregulating ACE-2 receptor, gastrointestinal risk via causing vomiting, diarrhea, and abdominal pain, chronic kidney disease via proteinuria and hematuria, diabetes mellitus, liver injury via increasing ALT, AST and bilirubin level, lung injury, CNS risk, ocular risk, and cancer risk. In this, we are focused on the COVID-19 connected with male infertility. Some of the studies show that the patients of COVID-19 are associated with impaired spermatogenesis. Impaired spermatogenesis via COVID-19 decreases the level of testosterone by disturbing cytokines such as TNF-α, IL-4, IL-6, and IL-12 and further, attenuates the sperm count. COVID-19 is causing inflammation via TNF-α and interferons. IL-4 plays an eminent role in the activation of the JAK-STAT pathway and leads to the disturbing pro-inflammatory cytokine as well as further cause's male infertility. Th2 activates the IL-4 through IgG and IgE and mediates apoptosis with the triggering of STAT signaling. The activated STAT signaling augments Batf/Irf4, and the Bach2/Batf pathway. On the other hand, SARS-CoV-2 is activating the level of Th2 cells. So, we hypothesized that the augmented Th2 cells would disturb the level of IL-4, JAK-STAT signaling, Batf/Irf4, and Bach2/Batf pathway. The disturbed IL-4 decreases the level of the ACE-2 with the inflammation. This further leads to male infertility in COVID-19 patients. So, in this hypothesis, we focused on the role of IL-4 in COVID-19 patients associated with male infertility via Th2 cells and JAK-STAT signaling.
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Affiliation(s)
- Kaviyarasi Renu
- Department of Biomedical Sciences, School of Biosciences and Technology, VIT, Vellore, Tamil Nadu 632014, India
| | - Mohana Devi Subramaniam
- Department of Genetics and Molecular Biology, Vision Research Foundation, Chennai 600 006, India
| | - Rituraj Chakraborty
- Department of Biomedical Sciences, School of Biosciences and Technology, VIT, Vellore, Tamil Nadu 632014, India
| | - Haritha Myakala
- Department of Biomedical Sciences, School of Biosciences and Technology, VIT, Vellore, Tamil Nadu 632014, India
| | - Mahalaxmi Iyer
- Department of Zoology, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore 641 043, Tamil Nadu, India
| | - Geetha Bharathi
- Human Molecular Cytogenetics and Stem Cell Laboratory, Department of Human Genetics and Molecular Biology, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - Kamalakannan Siva
- National Center for Disease Control, Ministry of Health and Family Welfare, Government of India, New Delhi 110054, India
| | - Balachandar Vellingiri
- Human Molecular Cytogenetics and Stem Cell Laboratory, Department of Human Genetics and Molecular Biology, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India.
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Chen J, Jiang S, Wang J, Renukuntla J, Sirimulla S, Chen J. A comprehensive review of cytochrome P450 2E1 for xenobiotic metabolism. Drug Metab Rev 2019; 51:178-195. [PMID: 31203697 DOI: 10.1080/03602532.2019.1632889] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cytochrome P450 2E1 (CYP2E1) plays a vital role in drug-induced hepatotoxicity and cancers (e.g. lung and bladder cancer), since it is responsible for metabolizing a number of medications and environmental toxins to reactive intermediate metabolites. CYP2E1 was recently found to be the highest expressed CYP enzyme in human livers using a proteomics approach, and CYP2E1-related toxicity is strongly associated with its protein level that shows significant inter-individual variability related to ethnicity, age, and sex. Furthermore, the expression of CYP2E1 demonstrates regulation by extensive genetic polymorphism, endogenous hormones, cytokines, xenobiotics, and varying pathological states. Over the past decade, the knowledge of pharmacology, toxicology, and biology about CYP2E1 has grown remarkably, but the research progress has yet to be summarized. This study presents a timely systematic review on CYP2E1's xenobiotic metabolism, genetic polymorphism, and inhibitors, with the focus on their clinical relevance for the efficacy and toxicity of various CYP2E1 substrates. Moreover, several knowledge gaps have been identified towards fully understanding the potential interactions among different CYP2E1 substrates in clinical settings. Through in-depth analyses of these knowns and unknowns, we expect this review will aid in future drug development and improve management of CYP2E1 related clinical toxicity.
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Affiliation(s)
- Jingxuan Chen
- School of Pharmaceutical Sciences, Guangdong Provincial Key Laboratory of New Drug Screening, Southern Medical University , Guangzhou , China
| | - Sibo Jiang
- Department of Pharmaceutics, University of Florida , Orlando , FL , USA
| | - Jin Wang
- AbbVie Inc , North Chicago , IL , USA
| | - Jwala Renukuntla
- School of Pharmacy, The University of Texas at El Paso , El Paso , TX , USA
| | - Suman Sirimulla
- School of Pharmacy, The University of Texas at El Paso , El Paso , TX , USA
| | - Jianjun Chen
- School of Pharmaceutical Sciences, Guangdong Provincial Key Laboratory of New Drug Screening, Southern Medical University , Guangzhou , China
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Lin Y, Yuan Q, Qian F, Qin C, Cao Q, Wang M, Chu H, Zhang Z. Polymorphism rs4787951 in IL-4R contributes to the increased risk of renal cell carcinoma in a Chinese population. Gene 2019; 685:242-247. [PMID: 30472377 DOI: 10.1016/j.gene.2018.11.070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 11/01/2018] [Accepted: 11/20/2018] [Indexed: 10/27/2022]
Abstract
OBJECTIVE Interleukins are important molecules involved in tumor formation. In this study, the association between renal cell carcinoma (RCC) risk and single nucleotide polymorphisms (SNPs) on IL-4/IL-13/IL-4R was assessed. METHODS We recruited 620/623 cases/controls and conducted a case-control study. Five tagSNPs (i.e., IL-4R rs8832, IL-4R rs4787951, IL-13 rs1881457, IL-13 rs2066960 and IL-13 rs2069744) were selected. Odds ratios (ORs) with their 95% confidence intervals (CIs) were obtained to appraise the association between SNPs and RCC susceptibility. Luciferase report assay and EMSA were conducted to investigate whether SNPs could affect binding affinity of transcription factors to target genes. RESULTS IL-4R rs4787951T>C was significantly associated with RCC susceptibility. Individuals carrying CC genotypes had a significant increment in RCC risk compared with TT genotype carriers (adjusted OR = 1.57, 95% CI = 1.07-2.28, P = 0.020). By stratified analyses, more pronounced association was found in the female, diabetic or without smoking, drinking and hypertension group. Besides, SNP rs4787951 could influence the binding affinity of IL-4R to transcription factors. Sequence surrounding allele T was prone to bind transcription factor NFATc. CONCLUSIONS This study revealed that IL-4R rs4787951T>C was associated with susceptibility of RCC and could be a predictive biomarker for RCC risk.
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Affiliation(s)
- Yadi Lin
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China; State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing, China; Center for Disease Prevention and Control of Gusu District, Suzhou, China
| | - Qi Yuan
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China; State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Fangze Qian
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Chao Qin
- Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Qiang Cao
- Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Meilin Wang
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China; State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Haiyan Chu
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China; State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing, China.
| | - Zhengdong Zhang
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China; Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China; State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing, China.
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Identification of a Shared Cytochrome p4502E1 Epitope Found in Anesthetic Drug-Induced and Viral Hepatitis. mSphere 2018; 3:3/5/e00453-18. [PMID: 30305319 PMCID: PMC6180222 DOI: 10.1128/msphere.00453-18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Drug-induced hepatitis is the leading reason that an approved drug is removed from the commercial market. Halogenated anesthetics can induce hepatitis in susceptible persons, and cytochrome p4502E1 (CYP2E1) enzymes responsible for their metabolism induce antibodies in addition to hepatitis. CYP2E1 antibodies detected in anesthetic hepatitis patients have been detected in patients with viral hepatitis, suggesting that these different forms of hepatitis could develop immune reactions to a common segment or epitope of CYP2E1. We have found a common MHC-restricted CYP2E1 epitope in anesthetic and viral hepatitis that is a dominant epitope in anesthetic hepatitis and is significantly associated with fibrosis in patients with viral hepatitis. Along with conformational epitopes, our identification of MHC-restricted CYP2E1 epitopes can be used to develop specific diagnostic tests for drug-induced or viral hepatitis or associated fibrosis or to predict individuals at risk for developing these diseases or their sequelae. Cytochrome p4502E1 (CYP2E1) autoantibodies are biomarkers for drug-induced hepatitis and chronic hepatitis C. However, major histocompatibility-restricted CYP2E1 epitopes associated with these diseases have not been identified. We hypothesized that CYP2E1 epitopes associated with different types of hepatitis may be shared and may impact immune responses and metabolism. SYFPEITHI epitope prediction identified CYP2E1 candidate epitopes that would be recognized by MHC II haplotypes. Candidate epitopes were tested for induction of hepatitis and CYP2E1 autoantibodies in mice and recognition by sera from patients with anesthetic drug-induced and viral hepatitis. Human liver cells treated with epitope hybridoma serum were analyzed for mitochondrial stress. CYP2E1 activity was measured in human microsomes similarly treated. Epitope antibodies in viral hepatitis sera were analyzed using linear regression to uncover associations with liver pathology. A P value of <0.05 was considered significant. One epitope (Gly113-Leu135) induced hepatitis and CYP2E1 autoantibodies in mice after modification of Lys123 (P < 0.05). Gly113-Leu135 antiserum recognized mitochondria and endoplasmic reticula (P < 0.05), upregulated HSP27 (P < 0.01) and mitochondrial oxidative stress via complex 1 inhibition (P < 0.001), and inhibited CYP2E1 activity. Gly113-Leu135 IgG4 detected in viral hepatitis sera was associated with severe hepatic fibrosis (P = 0.0142). We found a novel CYP2E1 epitope that was detected in anesthetic and viral hepatitis and that triggered hepatitis in mice. Our findings may improve understanding of hepatic immune responses triggered by metabolism or viruses. IMPORTANCE Drug-induced hepatitis is the leading reason that an approved drug is removed from the commercial market. Halogenated anesthetics can induce hepatitis in susceptible persons, and cytochrome p4502E1 (CYP2E1) enzymes responsible for their metabolism induce antibodies in addition to hepatitis. CYP2E1 antibodies detected in anesthetic hepatitis patients have been detected in patients with viral hepatitis, suggesting that these different forms of hepatitis could develop immune reactions to a common segment or epitope of CYP2E1. We have found a common MHC-restricted CYP2E1 epitope in anesthetic and viral hepatitis that is a dominant epitope in anesthetic hepatitis and is significantly associated with fibrosis in patients with viral hepatitis. Along with conformational epitopes, our identification of MHC-restricted CYP2E1 epitopes can be used to develop specific diagnostic tests for drug-induced or viral hepatitis or associated fibrosis or to predict individuals at risk for developing these diseases or their sequelae.
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van Son M, Agarwal R, Kent MP, Grove H, Grindflek E, Lien S. Exploiting whole genome sequence data to fine map and characterize candidate genes within a quantitative trait loci region affecting androstenone on porcine chromosome 5. Anim Genet 2017; 48:653-659. [PMID: 29034488 PMCID: PMC5698758 DOI: 10.1111/age.12615] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/04/2017] [Indexed: 11/30/2022]
Abstract
Male piglets are routinely castrated to eliminate boar taint. However, this treatment is undesirable, and alternative approaches, including genetic strategies to reduce boar taint, are demanded. Androstenone is one of the causative agents of boar taint, and a QTL region affecting this pheromone has previously been reported on SSC5: 22.6–24.8 Mb in Duroc. The QTL region is one of the few reported for androstenone that does not simultaneously affect levels of other sex steroids. The main objective of this study was to fine map this QTL. Whole genome sequence data from 23 Norwegian Duroc boars were analyzed to detect new polymorphisms within the QTL region. A subset of 161 SNPs was genotyped in 834 Duroc sires and analyzed for association with androstenone in adipose tissue and testosterone, estrone sulphate and 17β‐estradiol in blood plasma. Our results revealed 100 SNPs significantly associated with androstenone levels in fat (P < 0.001) with 94 of the SNPs being in strong linkage disequilibrium in the region 23.03–24.27 Mb. This haplotype block contains at least four positional candidate genes (HSD17B6,SDR9C7,RDH16 and STAT6) involved in androstenone biosynthesis. No significant associations were found between any of the SNPs and levels of testosterone and estrogens, confirming previous findings. The amount of phenotypic variance explained by single SNPs within the haplotype block was as high as 5.4%. As the SNPs in this region significantly affect levels of androstenone without affecting levels of other sex steroids, they are especially interesting as genetic markers for selection against boar taint.
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Affiliation(s)
- M van Son
- Topigs Norsvin, Storhamargata 44, 2317, Hamar, Norway
| | - R Agarwal
- Department of Animal and Aquacultural Sciences (IHA), Faculty of Life Sciences (BIOVIT), Centre for Integrative Genetics (CIGENE), Norwegian University of Life Sciences (NMBU), PO Box 5003, 1432, Ås, Norway
| | - M P Kent
- Department of Animal and Aquacultural Sciences (IHA), Faculty of Life Sciences (BIOVIT), Centre for Integrative Genetics (CIGENE), Norwegian University of Life Sciences (NMBU), PO Box 5003, 1432, Ås, Norway
| | - H Grove
- Department of Animal and Aquacultural Sciences (IHA), Faculty of Life Sciences (BIOVIT), Centre for Integrative Genetics (CIGENE), Norwegian University of Life Sciences (NMBU), PO Box 5003, 1432, Ås, Norway
| | - E Grindflek
- Topigs Norsvin, Storhamargata 44, 2317, Hamar, Norway
| | - S Lien
- Department of Animal and Aquacultural Sciences (IHA), Faculty of Life Sciences (BIOVIT), Centre for Integrative Genetics (CIGENE), Norwegian University of Life Sciences (NMBU), PO Box 5003, 1432, Ås, Norway
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10
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Goldstein J, Roth E, Roberts N, Zwick R, Lin S, Fletcher S, Tadeu A, Wu C, Beck A, Zeiss C, Suárez-Fariñas M, Horsley V. Loss of endogenous Nfatc1 reduces the rate of DMBA/TPA-induced skin tumorigenesis. Mol Biol Cell 2015; 26:3606-14. [PMID: 26310443 PMCID: PMC4603931 DOI: 10.1091/mbc.e15-05-0282] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 08/18/2015] [Indexed: 12/17/2022] Open
Abstract
Immunosuppressive therapies using calcineurin inhibitors, such as cyclosporine A, are associated with a higher incidence of squamous cell carcinoma formation in mice and humans. Calcineurin is believed to suppress tumorigenesis in part through Nfatc1, a transcription factor expressed primarily in hair follicle bulge stem cells in mice. However, mice overexpressing a constitutively active Nfatc1 isoform in the skin epithelium developed increased spontaneous skin squamous cell carcinomas. Because follicular stem cells can contribute to skin tumorigenesis, whether the endogenous expression of Nfatc1 inhibits or enhances skin tumorigenesis is unclear. Here we show that loss of the endogenous expression of Nfatc1 suppresses the rate of DMBA/TPA-induced skin tumorigenesis. Inducible deletion of Nfatc1 in follicular stem cells before tumor initiation significantly reduces the rate of tumorigenesis and the contribution of follicular stem cells to skin tumors. We find that skin tumors from mice lacking Nfatc1 display reduced Hras codon 61 mutations. Furthermore, Nfatc1 enhances the expression of genes involved in DMBA metabolism and increases DMBA-induced DNA damage in keratinocytes. Together these data implicate Nfatc1 in the regulation of skin stem cell-initiated tumorigenesis via the regulation of DMBA metabolism.
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Affiliation(s)
- Jill Goldstein
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Eve Roth
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Natalie Roberts
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Rachel Zwick
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Samantha Lin
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Sean Fletcher
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Ana Tadeu
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Christine Wu
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520
| | - Amanda Beck
- Department of Comparative Medicine, Yale University, New Haven, CT 06520
| | - Caroline Zeiss
- Department of Comparative Medicine, Yale University, New Haven, CT 06520
| | - Mayte Suárez-Fariñas
- Departments of Population Health Science and Policy, Genetics and Genomics Science, and Dermatology, Icahn School of Medicine, New York, NY 10029
| | - Valerie Horsley
- Department of Molecular, Cell and Developmental Biology, Yale University, New Haven, CT 06520 Department of Dermatology, Yale University, New Haven, CT 06520
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11
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Liu H, Lou G, Li C, Wang X, Cederbaum AI, Gan L, Xie B. HBx inhibits CYP2E1 gene expression via downregulating HNF4α in human hepatoma cells. PLoS One 2014; 9:e107913. [PMID: 25238230 PMCID: PMC4169590 DOI: 10.1371/journal.pone.0107913] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 08/21/2014] [Indexed: 12/23/2022] Open
Abstract
CYP2E1, one of the cytochrome P450 mixed-function oxidases located predominantly in liver, plays a key role in metabolism of xenobiotics including ethanol and procarcinogens. Recently, down-expression of CYP2E1 was found in hepatocellular carcinoma (HCC) with the majority to be chronic hepatitis B virus (HBV) carriers. In this study, we tested a hypothesis that HBx may inhibit CYP2E1 gene expression via hepatocyte nuclear factor 4α (HNF4α). By enforced HBx gene expression in cultured HepG2 cells, we determined the effect of HBx on CYP2E1 mRNA and protein expression. With a bioinformatics analysis, we found a consensus HNF-4α binding sequence located on −318 to −294 bp upstream of human CYP2E1 promoter. Using reporter gene assay and site-directed mutagenesis, we have shown that mutation of this site dramatically decreased CYP2E1 promoter activity. By silencing endogenous HNF-4α, we have further validated knockdown of HNF-4α significantly decreased CYP2E1expression. Ectopic overexpression of HBx in HepG2 cells inhibits HNF-4α expression, and HNF-4α levels were inversely correlated with viral proteins both in HBV-infected HepG2215 cells and as well as HBV positive HCC liver tissues. Moreover, the HBx-induced CYP2E1 reduction could be rescued by ectopic supplement of HNF4α protein expression. Furthermore, human hepatoma cells C34, which do not express CYP2E1, shows enhanced cell growth rate compared to E47, which constitutively expresses CYP2E1. In addition, the significantly altered liver proteins in CYP2E1 knockout mice were detected with proteomics analysis. Together, HBx inhibits human CYP2E1 gene expression via downregulating HNF4α which contributes to promotion of human hepatoma cell growth. The elucidation of a HBx-HNF4α-CYP2E1 pathway provides novel insight into the molecular mechanism underlining chronic HBV infection associated hepatocarcinogenesis.
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Affiliation(s)
- Hongming Liu
- Department of Hepatobiliary Surgery, Daping Hospital & Institute of Surgery Research, The Third Military Medical University, Chongqing, China
| | - Guiyu Lou
- Department of Biochemistry and Molecular Biology, The Third Military Medical University, Chongqing, China
| | - Chongyi Li
- Department of Biochemistry and Molecular Biology, The Third Military Medical University, Chongqing, China
| | - Xiaodong Wang
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
- Chongqing Biomean Technology Co., Ltd, Chongqing, China
| | - Arthur I. Cederbaum
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
| | - Lixia Gan
- Department of Biochemistry and Molecular Biology, The Third Military Medical University, Chongqing, China
- * E-mail: (LG); (BX)
| | - Bin Xie
- Department of Hepatobiliary Surgery, Daping Hospital & Institute of Surgery Research, The Third Military Medical University, Chongqing, China
- * E-mail: (LG); (BX)
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12
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Jaesch H. Interleukin-4 and acetaminophen hepatotoxicity: a story of conflicting results and conclusions. Inflamm Res 2014; 63:171-2. [PMID: 24232263 DOI: 10.1007/s00011-013-0686-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Accepted: 11/05/2013] [Indexed: 11/29/2022] Open
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13
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Feng D, Wang Y, Wang H, Weng H, Kong X, Martin-Murphy BV, Li Y, Park O, Dooley S, Ju C, Gao B. Acute and chronic effects of IL-22 on acetaminophen-induced liver injury. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 193:2512-8. [PMID: 25063867 PMCID: PMC4135042 DOI: 10.4049/jimmunol.1400588] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Acetaminophen (APAP)-induced liver injury (AILI) accounts for half of the acute liver failure cases in the United States. A better understanding of the underlying mechanisms of AILI is necessary for the development of novel antidotes. We found that pretreatment with IL-22 protected mice from APAP-mediated hepatotoxicity. The protection was dependent on STAT3, as IL-22 failed to reduce APAP hepatotoxicity in liver-specific STAT3 knockout mice. In contrast to the acute exposure to IL-22, the endogenous chronic overexpression of IL-22 in IL-22 transgenic (TG) mice or IL-22 adenovirus treatment for 6 wk resulted in a markedly increased susceptibility to AILI. Furthermore, the hepatic expression levels of cytochrome 2E1 (Cyp2E1) and Cyp1A2 were much higher in IL-22TG mice. Ablation of Cyp2E1 but not hepatic STAT3 abolished AILI and protein-adduct formation in IL-22TG mice. Finally, hepatic expression of HNF-1α, a transcriptional factor that is known to control Cyp2E1 expression, was elevated in IL-22TG mice compared with wild-type mice. Upregulation of hepatic Cyp2E1 was only observed in mice with constitutive overexpression of IL-22 but not with short-term treatment with one dose of IL-22 or multiple doses of IL-22 for 2 wk. In conclusion, short-term acute IL-22 exposure protects mice against AILI through STAT3 activation; however, chronic constitutive overexpression of IL-22 exacerbates AILI by increasing Cyp2E1 and toxic reactive APAP metabolite production. These findings may not only enhance our understanding of the effects of chronic inflammation on AILI in patients with liver disease, but are also helpful to identify novel therapeutic targets for the treatment of AILI.
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Affiliation(s)
- Dechun Feng
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892
| | - Yan Wang
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892
| | - Hua Wang
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892
| | - Honglei Weng
- Medical Clinic, Faculty of Medicine at Mannheim, University of Heidelberg, Mannheim 68167, Germany
| | - Xiaoni Kong
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China; and
| | - Brittany V Martin-Murphy
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
| | - Yongmei Li
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892
| | - Ogyi Park
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892
| | - Steven Dooley
- Medical Clinic, Faculty of Medicine at Mannheim, University of Heidelberg, Mannheim 68167, Germany
| | - Cynthia Ju
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
| | - Bin Gao
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20892;
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14
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Lee JK, Chung HJ, Fischer L, Fischer J, Gonzalez FJ, Jeong H. Human placental lactogen induces CYP2E1 expression via PI 3-kinase pathway in female human hepatocytes. Drug Metab Dispos 2014; 42:492-9. [PMID: 24408518 PMCID: PMC3965907 DOI: 10.1124/dmd.113.055384] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 01/08/2014] [Indexed: 12/29/2022] Open
Abstract
The state of pregnancy is known to alter hepatic drug metabolism. Hormones that rise during pregnancy are potentially responsible for the changes. Here we report the effects of prolactin (PRL), placental lactogen (PL), and growth hormone variant (GH-v) on expression of major hepatic cytochromes P450 expression and a potential molecular mechanism underlying CYP2E1 induction by PL. In female human hepatocytes, PRL and GH-v showed either no effect or small and variable effects on mRNA expression of CYP1A2, 2A6, 2B6, 2C9, 2C19, 2D6, 2E1, 3A4, and 3A5. On the other hand, PL increased expression level of CYP2E1 mRNA with corresponding increases in CYP2E1 protein and activity levels. Results from hepatocytes and HepaRG cells indicate that PL does not affect the expression or activity of HNF1α, the known transcriptional activator of basal CYP2E1 expression. Furthermore, transient transfection studies and Western blot results showed that STAT signaling, the previously known mediator of PL actions in certain tissues, does not play a role in CYP2E1 induction by PL. A chemical inhibitor of PI3-kinase signaling significantly repressed the CYP2E1 induction by PL in human hepatocytes, suggesting involvement of PI3-kinase pathway in CYP2E1 regulation by PL. CYP2E1-humanized mice did not exhibit enhanced CYP2E1 expression during pregnancy, potentially because of interspecies differences in PL physiology. Taken together, these results indicate that PL induces CYP2E1 expression via PI3-kinase pathway in human hepatocytes.
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Affiliation(s)
- Jin Kyung Lee
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois (J.K.L., H.J.C., L.F., J.F., H.J.); College of Pharmacy, Gyeongsang National University, Jinju, South Korea (H.J.C.); Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland (F.J.G.); and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois (H.J.)
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15
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Wei M, He Q, Yang Z, Wang Z, Zhang Q, Liu B, Gu Q, Su L, Yu Y, Zhu Z, Zhang G. Integrity of the LXXLL motif in Stat6 is required for the inhibition of breast cancer cell growth and enhancement of differentiation in the context of progesterone. BMC Cancer 2014; 14:10. [PMID: 24401087 PMCID: PMC4021501 DOI: 10.1186/1471-2407-14-10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Accepted: 09/17/2013] [Indexed: 11/13/2022] Open
Abstract
Background Progesterone is essential for the proliferation and differentiation of mammary gland epithelium. Studies of breast cancer cells have demonstrated a biphasic progesterone response consisting of an initial proliferative burst followed by sustained growth arrest. However, the transcriptional factors acting with the progesterone receptor (PR) to mediate the effects of progesterone on mammary cell growth and differentiation remain to be determined. Recently, it was demonstrated that signal transducer and activator of transcription 6 (Stat6) is a cell growth suppressor. Similar to progesterone-bound PR, Stat6 acts by inducing the expression of the G1 cyclin-dependent kinase inhibitors p21 and p27. The possible interaction between Stat6 and progesterone pathways in mammary cells was therefore investigated in the present study. Methods ChIP and luciferase were assayed to determine whether Stat6 induces p21 and p27 expression by recruitment at the proximal Sp1-binding sites of the gene promoters. Immunoprecipitation and Western blotting were performed to investigate the interaction between Stat6 and PR-B. The cellular DNA content and cell cycle distribution in breast cancer cells were analyzed by FACS. Results We found that Stat6 interacts with progesterone-activated PR in T47D cells. Stat6 synergizes with progesterone-bound PR to transactivate the p21 and p27 gene promoters at the proximal Sp1-binding sites. Moreover, Stat6 overexpression and knockdown, respectively, increased or prevented the induction of p21 and p27 gene expression by progesterone. Stat6 knockdown also abolished the inhibitory effects of progesterone on pRB phosphorylation, G1/S cell cycle progression, and cell proliferation. In addition, knockdown of Stat6 expression prevented the induction of breast cell differentiation markers, previously identified as progesterone target genes. Finally, Stat6 gene expression levels increased following progesterone treatment, indicating a positive auto-regulatory loop between PR and Stat6. Conclusions Taken together, these data identify Stat6 as a coactivator of PR mediating the growth-inhibitory and differentiation effects of progesterone on breast cancer cells.
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Affiliation(s)
- Min Wei
- Breast Department, International Peace Maternity and Child Health Hospital, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China.
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16
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Pires DA, Marques PE, Pereira RV, David BA, Gomides LF, Dias ACF, Nunes-Silva A, Pinho V, Cara DC, Vieira LQ, Teixeira MM, Menezes GB. Interleukin-4 deficiency protects mice from acetaminophen-induced liver injury and inflammation by prevention of glutathione depletion. Inflamm Res 2013; 63:61-9. [PMID: 24100592 DOI: 10.1007/s00011-013-0671-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 09/28/2013] [Indexed: 01/02/2023] Open
Abstract
OBJECTIVE Interleukin-4 (IL-4) is a multifunctional cytokine involved in many diseases such as autoimmune hepatitis and idiosyncratic drug reactions. However, its role in acetaminophen (APAP)-induced liver injury remains unclear. Our objective was to evaluate the contribution of IL-4 to the pathogenesis of APAP-induced liver injury. METHODS Balb/C (WT) and IL-4 knockout (IL-4(-/-)) mice were orally overdosed with APAP. After 24 h, survival percentage, biochemical and morphological markers of liver injury, and tissue inflammation were assessed. RESULTS IL-4(-/-) mice were protected from APAP toxicity. Intravital confocal microscopy, tissue histology and serum ALT levels showed significantly less liver injury and inflammation than in the WT group, which may explain the increased survival rate of IL-4(-/-) mice. In addition, IL-4(-/-) mice had decreased production of tumor necrosis factor α, CXCL1 and interleukin-1β in the liver, but not in a remote site such as the lungs. Hepatic macrophage activation was markedly reduced in IL-4-deficient mice. In addition, glutathione depletion-a primary cause of APAP-mediated injury-was significantly attenuated in IL-4(-/-) mice. CONCLUSIONS Taken together, our data demonstrate that IL-4(-/-) mice are protected from APAP-induced liver injury due to reduced depletion of glutathione, which prevented liver damage and tissue inflammation.
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Affiliation(s)
- Daniele Araújo Pires
- Laboratório de Imunobiofotônica, Departamento de Morfologia, ICB, Universidade Federal de Minas Gerais, Av. Antonio Carlos, Pampulha, Belo Horizonte, MG, 6627, Brazil
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Kojima M, Degawa M. Serum androgen level is determined by autosomal dominant inheritance and regulates sex-related CYP genes in pigs. Biochem Biophys Res Commun 2013. [DOI: 10.1016/j.bbrc.2012.11.060] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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18
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Aubert J, Begriche K, Knockaert L, Robin MA, Fromenty B. Increased expression of cytochrome P450 2E1 in nonalcoholic fatty liver disease: mechanisms and pathophysiological role. Clin Res Hepatol Gastroenterol 2011; 35:630-7. [PMID: 21664213 DOI: 10.1016/j.clinre.2011.04.015] [Citation(s) in RCA: 203] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 04/20/2011] [Indexed: 02/07/2023]
Abstract
Due to the worldwide surge in obesity and type 2 diabetes, the increased incidence of nonalcoholic fatty liver disease (NAFLD) is a major concern for the public health. Indeed, NAFLD encompasses a large spectrum of conditions ranging from fatty liver to nonalcoholic steatohepatitis (NASH), which can progress to cirrhosis in some patients. A better understanding of the mechanisms involved in fatty liver and its progression into NASH is important in order to develop efficient drugs able to alleviate these liver diseases. Although numerous investigations pointed to reactive oxygen species (ROS) as key players in the progression of fatty liver to NASH, their exact source is still uncertain. Besides the mitochondrial respiratory chain, cytochrome P450 2E1 (CYP2E1) has recently emerged as another potentially important cause of ROS overproduction. Indeed, higher hepatic CYP2E1 expression and activity have been frequently observed in the context of obesity and NAFLD. It is currently unknown why CYP2E1 is enhanced in these dysmetabolic diseases, although increased hepatic levels of fatty acids and insulin resistance might play a role. Nonetheless, higher hepatic CYP2E1 could play a significant role in the pathophysiology of NASH by inducing lipid peroxidation and oxidative damage of key cellular components. Moreover, CYP2E1-mediated overproduction of ROS could promote hepatic insulin resistance, which can further aggravate fatty liver. Since a significant amount of CYP2E1 can be located within liver mitochondria, higher levels of CYP2E1 in NAFLD could also have detrimental effects on mitochondrial function. Finally, increased CYP2E1 activity during NAFLD could enhance the susceptibility of some patients to the hepatotoxicity of different xenobiotics through the CYP2E1-mediated generation of harmful reactive metabolites.
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Affiliation(s)
- J Aubert
- Inserm, U991, Université de Rennes 1, 35000 Rennes, France
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