1
|
Burger K, Jung F, Staltner R, Csarmann K, Schweiger K, Brandt A, Baumann A, Scholda J, Kopp F, Bergheim I. A weekly 4-methylpyrazole treatment attenuates the development of non-obese metabolic dysfunction-associated steatotic liver disease (MASLD) in male mice: Role of JNK. Eur J Clin Invest 2025; 55:e14320. [PMID: 39344016 PMCID: PMC11628662 DOI: 10.1111/eci.14320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 09/10/2024] [Indexed: 10/01/2024]
Abstract
BACKGROUND 4-methylpyrazole (4MP, fomepizole) is a competitive inhibitor of alcohol dehydrogenase (ADH) preventing the metabolism of ethylene glycol and methanol, respectively, into their toxic metabolites. 4MP seems also to possess a potential in the treatment of intoxication from other substance, for example, acetaminophen, and to modulate JNK-dependent signalling. Here, we determined if a treatment with 4MP once weekly affects the development of diet-induced non-obese metabolic dysfunction-associated steatotic liver disease (MASLD) in C57BL/6 mice. METHODS Male C57BL/6 mice (6-8 weeks old, n = 7-8/group) were pair-fed either a liquid control diet (C) or a liquid sucrose-, fat- and cholesterol-rich diet (SFC) for 8 weeks while being concomitantly treated with 4MP (50 mg/kg bw i.p.) or vehicle once a week. Liver damage, inflammatory markers and glucose tolerance were assessed. Moreover, in endotoxin-challenged J774A.1 cells pretreated with 4MP, pro-inflammatory markers were assessed. RESULTS The concomitant treatment of SFC-fed mice with 4MP attenuated the increase in JNK phosphorylation and pro-inflammatory markers like IFNγ, IL-6 and 3-nitrotyrosine protein adducts in liver tissue found in vehicle-treated SFC-fed mice, while not affecting impairments of glucose tolerance or the increase in portal endotoxin levels. Moreover, a pretreatment of endotoxin-stimulated J774A.1 cells with 4MP significantly attenuated the increases in JNK phosphorylation and pro-inflammatory mediators like IL-6 and Mcp1. CONCLUSIONS Taken together, our results suggest that a treatment with 4MP once weekly attenuates the activation of JNK and dampens the development of non-obese MASLD in mice.
Collapse
Affiliation(s)
- Katharina Burger
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Finn Jung
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Raphaela Staltner
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Katja Csarmann
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Kerstin Schweiger
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Annette Brandt
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Anja Baumann
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| | - Julia Scholda
- Department of Pharmaceutical Sciences, Clinical Pharmacy GroupUniversity of ViennaViennaAustria
| | - Florian Kopp
- Department of Pharmaceutical Sciences, Clinical Pharmacy GroupUniversity of ViennaViennaAustria
| | - Ina Bergheim
- Department of Nutritional Sciences, Molecular Nutritional ScienceUniversity of ViennaViennaAustria
| |
Collapse
|
2
|
Debarba LK, Jayarathne HS, Stilgenbauer L, dos Santos ALT, Koshko L, Scofield S, Sullivan R, Mandal A, Klueh U, Sadagurski M. Microglia Mediate Metabolic Dysfunction From Common Air Pollutants Through NF-κB Signaling. Diabetes 2024; 73:2065-2077. [PMID: 39320947 PMCID: PMC11579412 DOI: 10.2337/db24-0110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 09/08/2024] [Indexed: 09/26/2024]
Abstract
The prevalence of type 2 diabetes (T2D) poses a significant health challenge, yet the contribution of air pollutants to T2D epidemics remains under-studied. Several studies demonstrated a correlation between exposure to volatile organic compounds (VOCs) in indoor/outdoor environments and T2D. Here, we conducted the first meta-analysis, establishing a robust association between exposure to benzene, a prevalent airborne VOC, and insulin resistance in humans across all ages. We used a controlled benzene exposure system, continuous glucose monitoring approach, and indirect calorimetry in mice, to investigate the underlying mechanisms. Following exposure, disruptions in energy homeostasis, accompanied by modifications in the hypothalamic transcriptome and alterations in insulin and immune signaling, were observed exclusively in males, leading to a surge in blood glucose levels. In agreement, RNA sequencing of microglia revealed increased expression of genes associated with immune response and NF-κB signaling. Selective ablation of IKKβ in immune cells (Cx3cr1GFPΔIKK) or exclusively in microglia (Tmem119ERΔIKK) in adult mice alleviated benzene-induced gliosis, restored energy homeostasis and hypothalamic gene expression, and protected against hyperglycemia. We conclude that the microglial NF-κB pathway plays a critical role in chemical-induced metabolic disturbances, revealing a vital pathophysiological mechanism linking exposure to airborne toxicants and the onset of metabolic diseases. ARTICLE HIGHLIGHTS
Collapse
Affiliation(s)
- Lucas K. Debarba
- Department of Biological Sciences, Wayne State University, Detroit, MI
| | | | | | | | - Lisa Koshko
- Department of Biological Sciences, Wayne State University, Detroit, MI
| | - Sydney Scofield
- Department of Biological Sciences, Wayne State University, Detroit, MI
| | - Ryan Sullivan
- Department of Biological Sciences, Wayne State University, Detroit, MI
| | - Abhijit Mandal
- Department of Mathematical Sciences, University of Texas at El Paso, El Paso, TX
| | - Ulrike Klueh
- Biomedical Engineering, Wayne State University, Detroit, MI
| | - Marianna Sadagurski
- Department of Biological Sciences, Wayne State University, Detroit, MI
- Institute of Environmental Health Sciences, Integrative Biosciences Center, Wayne State University, Detroit, MI
| |
Collapse
|
3
|
Lai W, Zhang J, Sun J, Min T, Bai Y, He J, Cao H, Che Q, Guo J, Su Z. Oxidative stress in alcoholic liver disease, focusing on proteins, nucleic acids, and lipids: A review. Int J Biol Macromol 2024; 278:134809. [PMID: 39154692 DOI: 10.1016/j.ijbiomac.2024.134809] [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: 05/05/2024] [Revised: 08/11/2024] [Accepted: 08/14/2024] [Indexed: 08/20/2024]
Abstract
Oxidative stress is one of the important factors in the development of alcoholic liver disease. The production of reactive oxygen species and other free radicals is an important feature of alcohol metabolism in the liver and an important substance in liver injury. When large amounts of ROS are produced, the homeostasis of the liver REDOX system will be disrupted and liver injury will be caused. Oxidative stress can damage proteins, nucleic acids and lipids, liver dysfunction. In addition, damaging factors produced by oxidative damage to liver tissue can induce the occurrence of inflammation, thereby aggravating the development of ALD. This article reviews the oxidative damage of alcohol on liver proteins, nucleic acids, and lipids, and provides new insights and summaries of the oxidative stress process. We also discussed the relationship between oxidative stress and inflammation in alcoholic liver disease from different perspectives. Finally, the research status of antioxidant therapy in alcoholic liver disease was summarized, hoping to provide better help for learning and developing the understanding of alcoholic liver disease.
Collapse
Affiliation(s)
- Weiwen Lai
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Provincial University Engineering Technology Research Center of Natural Products and Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China; Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Jiahua Zhang
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Provincial University Engineering Technology Research Center of Natural Products and Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China; Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Jiawei Sun
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Provincial University Engineering Technology Research Center of Natural Products and Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China; Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Tianqi Min
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Provincial University Engineering Technology Research Center of Natural Products and Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China; Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Yan Bai
- School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China
| | - Jincan He
- School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China
| | - Hua Cao
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Qishi Che
- Guangzhou Rainhome Pharm & Tech Co., Ltd, Science City, Guangzhou 510663, China
| | - Jiao Guo
- Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China.
| | - Zhengquan Su
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Provincial University Engineering Technology Research Center of Natural Products and Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China; Guangdong Metabolic Disease Research Center of Integrated Chinese and Western Medicine, Key Laboratory of Glucolipid Metabolic Disorder, Ministry of Education of China, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou 510006, China.
| |
Collapse
|
4
|
Somabattini RA, Sherin S, Siva B, Chowdhury N, Nanjappan SK. Unravelling the complexities of non-alcoholic steatohepatitis: The role of metabolism, transporters, and herb-drug interactions. Life Sci 2024; 351:122806. [PMID: 38852799 DOI: 10.1016/j.lfs.2024.122806] [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: 03/27/2024] [Revised: 05/24/2024] [Accepted: 06/04/2024] [Indexed: 06/11/2024]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a mainstream halting liver disease with high prevalence in North America, Europe, and other world regions. It is an advanced form of NAFLD caused by the amassing of fat in the liver and can progress to the more severe form known as non-alcoholic steatohepatitis (NASH). Until recently, there was no authorized pharmacotherapy reported for NASH, and to improve the patient's metabolic syndrome, the focus is mainly on lifestyle modification, weight loss, ensuring a healthy diet, and increased physical activity; however, the recent approval of Rezdiffra (Resmetirom) by the US FDA may change this narrative. As per the reported studies, there is an increased articulation of uptake and efflux transporters of the liver, including OATP and MRP, in NASH, leading to changes in the drug's pharmacokinetic properties. This increase leads to alterations in the pharmacokinetic properties of drugs. Furthermore, modifications in Cytochrome P450 (CYP) enzymes can have a significant impact on these properties. Xenobiotics are metabolized primarily in the liver and constitute liver enzymes and transporters. This review aims to delve into the role of metabolism, transport, and potential herb-drug interactions in the context of NASH.
Collapse
Affiliation(s)
- Ravi Adinarayan Somabattini
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, West Bengal, India
| | - Sahla Sherin
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, West Bengal, India
| | - Bhukya Siva
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, West Bengal, India
| | - Neelanjan Chowdhury
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, West Bengal, India
| | - Satheesh Kumar Nanjappan
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, West Bengal, India.
| |
Collapse
|
5
|
Blumstein D, MacManes M. The multi-tissue gene expression and physiological responses of water deprived Peromyscus eremicus. BMC Genomics 2024; 25:770. [PMID: 39118009 PMCID: PMC11308687 DOI: 10.1186/s12864-024-10629-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 07/17/2024] [Indexed: 08/10/2024] Open
Abstract
The harsh and dry conditions of desert environments have resulted in genomic adaptations, allowing for desert organisms to withstand prolonged drought, extreme temperatures, and limited food resources. Here, we present a comprehensive exploration of gene expression across five tissues (kidney, liver, lung, gastrointestinal tract, and hypothalamus) and 19 phenotypic measurements to explore the whole-organism physiological and genomic response to water deprivation in the desert-adapted cactus mouse (Peromyscus eremicus). The findings encompass the identification of differentially expressed genes and correlative analysis between phenotypes and gene expression patterns across multiple tissues. Specifically, we found robust activation of the vasopressin renin-angiotensin-aldosterone system (RAAS) pathways, whose primary function is to manage water and solute balance. Animals reduced food intake during water deprivation, and upregulation of PCK1 highlights the adaptive response to reduced oral intake via its actions aimed at maintained serum glucose levels. Even with such responses to maintain water balance, hemoconcentration still occurred, prompting a protective downregulation of genes responsible for the production of clotting factors while simultaneously enhancing angiogenesis which is thought to maintain tissue perfusion. In this study, we elucidate the complex mechanisms involved in water balance in the desert-adapted cactus mouse, P. eremicus. By prioritizing a comprehensive analysis of whole-organism physiology and multi-tissue gene expression in a simulated desert environment, we describe the complex response of regulatory processes.
Collapse
Affiliation(s)
- Danielle Blumstein
- Biomedical Sciences Department, University of New Hampshire, Molecular, Cellular, Durham, NH, DMB, 03824, USA.
| | - Matthew MacManes
- Biomedical Sciences Department, University of New Hampshire, Molecular, Cellular, Durham, NH, DMB, 03824, USA
| |
Collapse
|
6
|
He Q, Yin Z, Chen Y, Wu Y, Pan D, Cui Y, Zhang Z, Ma H, Li X, Shen C, Qin J, Wang S. Cyanidin-3-O-glucoside alleviates ethanol-induced liver injury by promoting mitophagy in a Gao-binge mouse model of alcohol-associated liver disease. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167259. [PMID: 38796918 DOI: 10.1016/j.bbadis.2024.167259] [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: 11/27/2023] [Revised: 05/14/2024] [Accepted: 05/16/2024] [Indexed: 05/29/2024]
Abstract
BACKGROUND Alcohol-associated liver disease (ALD) is a leading cause of liver disease-related deaths worldwide. Unfortunately, approved medications for the treatment of this condition are quite limited. One promising candidate is the anthocyanin, Cyanidin-3-O-glucoside (C3G), which has been reported to protect mice against hepatic lipid accumulation, as well as fibrosis in different animal models. However, the specific effects and mechanisms of C3G on ALD remain to be investigated. EXPERIMENTAL APPROACH In this report, a Gao-binge mouse model of ALD was used to investigate the effects of C3G on ethanol-induced liver injury. The mechanisms of these C3G effects were assessed using AML12 hepatocytes. RESULTS C3G administration ameliorated ethanol-induced liver injury by suppressing hepatic oxidative stress, as well as through reducing hepatic lipid accumulation and inflammation. Mechanistically, C3G activated the AMPK pathway and enhanced mitophagy to eliminate damaged mitochondria, thus reducing mitochondria-derived reactive oxidative species in ethanol-challenged hepatocytes. CONCLUSIONS The results of this study indicate that mitophagy plays a potentially important role underlying the hepatoprotective action of C3G, as demonstrated in a Gao-binge mouse model of ALD. Accordingly, C3G may serve as a promising, new therapeutic drug candidate for use in ALD.
Collapse
Affiliation(s)
- Qiao He
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Zhaoqing Yin
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Yunling Chen
- Science and Technology Innovation Center, Shandong First Medical University, Jinan, China
| | - Yunxiao Wu
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Di Pan
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Yuanhao Cui
- Science and Technology Innovation Center, Shandong First Medical University, Jinan, China
| | - Zinuo Zhang
- Science and Technology Innovation Center, Shandong First Medical University, Jinan, China
| | - Hanyu Ma
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Xuanji Li
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Chang Shen
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Shandong University, Jinan, China
| | - Junfang Qin
- School of Medicine, Nankai University, Tianjin, China.
| | - Shuanglian Wang
- Science and Technology Innovation Center, Shandong First Medical University, Jinan, China.
| |
Collapse
|
7
|
Kong EQZ, Subramaniyan V, Lubau NSA. Uncovering the impact of alcohol on internal organs and reproductive health: Exploring TLR4/NF-kB and CYP2E1/ROS/Nrf2 pathways. Animal Model Exp Med 2024; 7:444-459. [PMID: 38853347 PMCID: PMC11369036 DOI: 10.1002/ame2.12436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 05/10/2024] [Indexed: 06/11/2024] Open
Abstract
This review delves into the detrimental impact of alcohol consumption on internal organs and reproductive health, elucidating the underlying mechanisms involving the Toll-like receptor 4 (TLR4)/Nuclear factor kappa light chain enhancer of activated B cells (NF-kB) pathway and the Cytochrome P450 2E1 (CYP2E1)/reactive oxygen species (ROS)/nuclear factor erythroid 2-related factor 2 (Nrf2) pathways. The TLR4/NF-kB pathway, crucial for inflammatory and immune responses, triggers the production of pro-inflammatory agents and type-1 interferon, disrupting the balance between inflammatory and antioxidant responses when tissues are chronically exposed to alcohol. Alcohol-induced dysbiosis in gut microbes heightens gut wall permeability to pathogen-associated molecular patterns (PAMPs), leading to liver cell infection and subsequent inflammation. Concurrently, CYP2E1-mediated alcohol metabolism generates ROS, causing oxidative stress and damaging cells, lipids, proteins, and deoxyribonucleic acid (DNA). To counteract this inflammatory imbalance, Nrf2 regulates gene expression, inhibiting inflammatory progression and promoting antioxidant responses. Excessive alcohol intake results in elevated liver enzymes (ADH, CYP2E1, and catalase), ROS, NADH, acetaldehyde, and acetate, leading to damage in vital organs such as the heart, brain, and lungs. Moreover, alcohol negatively affects reproductive health by inhibiting the hypothalamic-pituitary-gonadal axis, causing infertility in both men and women. These findings underscore the profound health concerns associated with alcohol-induced damage, emphasizing the need for public awareness regarding the intricate interplay between immune responses and the multi-organ impacts of alcohol consumption.
Collapse
Affiliation(s)
- Eason Qi Zheng Kong
- Pharmacology Unit, Jeffrey Cheah School of Medicine and Health SciencesMonash University MalaysiaSubang JayaSelangorMalaysia
| | - Vetriselvan Subramaniyan
- Pharmacology Unit, Jeffrey Cheah School of Medicine and Health SciencesMonash University MalaysiaSubang JayaSelangorMalaysia
- Center for Global Health Research, Saveetha Medical CollegeSaveetha Institute of Medical and Technical SciencesChennaiTamil NaduIndia
| | - Natasha Sura Anak Lubau
- Pharmacology Unit, Jeffrey Cheah School of Medicine and Health SciencesMonash University MalaysiaSubang JayaSelangorMalaysia
| |
Collapse
|
8
|
Yan H, He L, Lv D, Yang J, Yuan Z. The Role of the Dysregulated JNK Signaling Pathway in the Pathogenesis of Human Diseases and Its Potential Therapeutic Strategies: A Comprehensive Review. Biomolecules 2024; 14:243. [PMID: 38397480 PMCID: PMC10887252 DOI: 10.3390/biom14020243] [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: 12/06/2023] [Revised: 02/12/2024] [Accepted: 02/15/2024] [Indexed: 02/25/2024] Open
Abstract
JNK is named after c-Jun N-terminal kinase, as it is responsible for phosphorylating c-Jun. As a member of the mitogen-activated protein kinase (MAPK) family, JNK is also known as stress-activated kinase (SAPK) because it can be activated by extracellular stresses including growth factor, UV irradiation, and virus infection. Functionally, JNK regulates various cell behaviors such as cell differentiation, proliferation, survival, and metabolic reprogramming. Dysregulated JNK signaling contributes to several types of human diseases. Although the role of the JNK pathway in a single disease has been summarized in several previous publications, a comprehensive review of its role in multiple kinds of human diseases is missing. In this review, we begin by introducing the landmark discoveries, structures, tissue expression, and activation mechanisms of the JNK pathway. Next, we come to the focus of this work: a comprehensive summary of the role of the deregulated JNK pathway in multiple kinds of diseases. Beyond that, we also discuss the current strategies for targeting the JNK pathway for therapeutic intervention and summarize the application of JNK inhibitors as well as several challenges now faced. We expect that this review can provide a more comprehensive insight into the critical role of the JNK pathway in the pathogenesis of human diseases and hope that it also provides important clues for ameliorating disease conditions.
Collapse
Affiliation(s)
- Huaying Yan
- Department of Ultrasound, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu 610075, China; (H.Y.); (L.H.)
| | - Lanfang He
- Department of Ultrasound, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu 610075, China; (H.Y.); (L.H.)
| | - De Lv
- Department of Endocrinology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu 610075, China
| | - Jun Yang
- Cancer Center and State Key Laboratory of Biotherapy, Department of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China;
| | - Zhu Yuan
- Cancer Center and State Key Laboratory of Biotherapy, Department of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China;
| |
Collapse
|
9
|
Blumstein DM, MacManes MD. When the tap runs dry: The multi-tissue gene expression and physiological responses of water deprived Peromyscus eremicus. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.22.576658. [PMID: 38328088 PMCID: PMC10849551 DOI: 10.1101/2024.01.22.576658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
The harsh and dry conditions of desert environments have resulted in genomic adaptations, allowing for desert organisms to withstand prolonged drought, extreme temperatures, and limited food resources. Here, we present a comprehensive exploration of gene expression across five tissues (kidney, liver, lung, gastrointestinal tract, and hypothalamus) and 19 phenotypic measurements to explore the whole-organism physiological and genomic response to water deprivation in the desert-adapted cactus mouse (Peromyscus eremicus). The findings encompass the identification of differentially expressed genes and correlative analysis between phenotypes and gene expression patterns across multiple tissues. Specifically, we found robust activation of the vasopressin renin-angiotensin-aldosterone system (RAAS) pathways, whose primary function is to manage water and solute balance. Animals reduce food intake during water deprivation, and upregulation of PCK1 highlights the adaptive response to reduced oral intake via its actions aimed at maintained serum glucose levels. Even with such responses to maintain water balance, hemoconcentration still occurred, prompting a protective downregulation of genes responsible for the production of clotting factors while simultaneously enhancing angiogenesis which is thought to maintains tissue perfusion. In this study, we elucidate the complex mechanisms involved in water balance in the desert-adapted cactus mouse, P. eremicus. By prioritizing a comprehensive analysis of whole-organism physiology and multi-tissue gene expression in a simulated desert environment, we describe the complex and successful response of regulatory processes.
Collapse
Affiliation(s)
- Danielle M Blumstein
- University of New Hampshire, Molecular, Cellular, and Biomedical Sciences Department, Durham, NH 03824
| | - Matthew D MacManes
- University of New Hampshire, Molecular, Cellular, and Biomedical Sciences Department, Durham, NH 03824
| |
Collapse
|
10
|
Jia L, Gao F, Hu G, Fang Y, Tang L, Wen Q, Gao N, Xu H, Qiao H. A Novel Cytochrome P450 2E1 Inhibitor Q11 Is Effective on Lung Cancer via Regulation of the Inflammatory Microenvironment. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303975. [PMID: 37875398 PMCID: PMC10724398 DOI: 10.1002/advs.202303975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 09/25/2023] [Indexed: 10/26/2023]
Abstract
Lung cancer is the leading cause of death among all cancers. A persistent chronic inflammatory microenvironment is highly correlated with lung cancer. However, there are no anti-inflammatory agents effective against lung cancer. Cytochrome P450 2E1 (CYP2E1) plays an important role in the inflammatory response. Here, it is found that CYP2E1 is significantly higher in the peritumoral tissue of non-small cell lung cancer (NSCLC) patients and lung tumor growth is significantly impeded in Cyp2e1-/- mice. The novel CYP2E1 inhibitor Q11, 1-(4-methyl-5-thialzolyl) ethenone, is effective in the treatment of lung cancer in mice, which can inhibit cancer cells by changing macrophage polarization rather than directly act on the cancer cells. It is also clarify that the benefit of Q11 may associated with the IL-6/STAT3 and MAPK/ERK pathways. The data demonstrate that CYP2E1 may be a novel inflammatory target and that Q11 is effective on lung cancer by regulation of the inflammatory microenvironment. These findings provide a molecular basis for targeting CYP2E1 and illustrate the potential druggability of the CYP2E1 inhibitor Q11.
Collapse
Affiliation(s)
- Lin Jia
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Fei Gao
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Guiming Hu
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Yan Fang
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Liming Tang
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Qiang Wen
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Na Gao
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| | - Haiwei Xu
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouHenan450001China
| | - Hailing Qiao
- Institute of Clinical PharmacologyZhengzhou UniversityZhengzhouHenan450001China
| |
Collapse
|
11
|
Gao F, Guan X, Zhang W, Han T, Liu X, Shi B. Oxidized Soybean Oil Evoked Hepatic Fatty Acid Metabolism Disturbance in Rats and their Offspring. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:13483-13494. [PMID: 37667911 DOI: 10.1021/acs.jafc.3c02466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
The oxidation of fats and oils is an undisputed subject of science, given the effect of oxidized fats and oils on food quality and safety. This study aimed to determine whether maternal exposure to oxidized soybean oil (OSO) causes lipid metabolism disorders in the liver and whether this lipid metabolism disorder can be transmitted to offspring or even worsened. A total of 60 female Sprague-Dawley (SD) rats were divided randomly into four groups in this study. Treatment groups received a pure diet of OSO with a peroxide value of 200, 400, or 800 mEqO2/kg, while the control group received fresh soybean oil (FSO). As for our results, OSO affected serum biochemical parameters in the maternal generation (F0) and induced liver histopathology changes, inflammation, and oxidative stress. Moreover, the expression of genes related to the liver X receptor α (LXRα)─sterol regulatory element binding protein-1c (SREBP-1c) signaling pathway was changed. Similar trends were found in the livers of offspring on postnatal days 21 and 56. In conclusion, exposure to OSO during gestation and lactation can affect liver lipid synthesis. Additionally, it is detrimental to the development of the offspring's liver, affecting fatty acid metabolism and causing liver damage.
Collapse
Affiliation(s)
- Feng Gao
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| | - Xin Guan
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| | - Wentao Zhang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| | - Tingting Han
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| | - Xinyu Liu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| | - Baoming Shi
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China
| |
Collapse
|
12
|
Wu S, Chen Q, Wang Y, Yin H, Wei Y. Lipid nanoparticle delivery of siRNA targeting Cyp2e1 gene attenuates subacute alcoholic liver injury in mice. Zhejiang Da Xue Xue Bao Yi Xue Ban 2023; 52:306-317. [PMID: 37476942 PMCID: PMC10409911 DOI: 10.3724/zdxbyxb-2022-0729] [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: 12/31/2022] [Accepted: 05/09/2023] [Indexed: 07/22/2023]
Abstract
OBJECTIVES To investigate the effect and mechanism of lipid nanoparticle (LNP) delivery of small interfering RNA (siRNA) targeting Cyp2e1 gene on subacute alcoholic liver injury in mice. METHODS siRNA targeting Cyp2e1 gene was encapsulated in LNP (si-Cyp2e1 LNP) by microfluidic technique and the resulting LNPs were characterized. The optimal dose of si-Cyp2e1 LNP administration was screened. Forty female C57BL/6N mice were randomly divided into blank control group, model control group, si-Cyp2e1 LNP group, LNP control group and metadoxine group. The subacute alcoholic liver injury mouse model was induced by ethanol feeding for 10 d plus ethanol gavage for the last 3 d. Serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities, and the superoxide dismutase (SOD) activity as well as malondialdehyde, reactive oxygen species, glutathione, triacylglycerol, total cholesterol contents in liver tissue were measured in each group, and liver index was calculated. The expression of genes related to oxidative stress, lipid synthesis and inflammation in each group of mice were measured by realtime RT-PCR. RESULTS Compared with the model control group, the levels of liver index, serum ALT, AST activities, malondialdehyde, reactive oxygen species, triacylglycerol, total cholesterol contents in liver tissue decreased, but the SOD activity as well as glutathione increased in the si-Cyp2e1 LNP group (all P<0.01). Hematoxylin-eosin staining result showed disorganized hepatocytes with sparse cytoplasm and a large number of fat vacuoles and necrosis in the model control group, while the si-Cyp2e1 LNP group had uniformly sized and arranged hepatocytes with normal liver tissue morphology and structure. Oil red O staining result showed si-Cyp2e1 LNP group had lower fat content of the liver compared to the model control group (P<0.01), and no fat droplets accumulated. Anti-F4/80 monoclonal antibody fluorescence immunohistochemistry showed that the si-Cyp2e1 LNP group had lower cumulative optical density values compared to the model control group (P<0.01) and no significant inflammatory reaction. Compared with the model control group, the expression of catalytic genes P47phox, P67phox and Gp91phox were reduced (all P<0.01), while the expression of the antioxidant enzyme genes Sod1, Gsh-rd and Gsh-px were increased (all P<0.01). The mRNA expression of the lipid metabolism genes Pgc-1α and Cpt1 were increased (all P<0.01) and the lipid synthesis-related genes Srebp1c, Acc and Fasn were decreased (all P<0.01); the expression of liver inflammation-related genes Tgf-β, Tnf-α and Il-6 were decreased (all P<0.01). CONCLUSIONS The si-Cyp2e1 LNP may attenuate subacute alcoholic liver injury in mice mainly by reducing reactive oxygen levels, increasing antioxidant activity, blocking oxidative stress pathways and reducing ethanol-induced steatosis and inflammation.
Collapse
Affiliation(s)
- Shuang Wu
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China.
| | - Qiubing Chen
- Department of Urology, Frontier Science Centre for Immunology and Metabolism, Medical Research Institute, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
- Department of Pulmonary and Critical Care Medicine, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Yalan Wang
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China
| | - Hao Yin
- Department of Urology, Frontier Science Centre for Immunology and Metabolism, Medical Research Institute, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
- Department of Pulmonary and Critical Care Medicine, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
- Department of Pathology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
- RNA Institute, Wuhan University, Wuhan 430072, China
- Wuhan Research Centre for Infectious Diseases and Cancer, Chinese Academy of Medical Sciences, Wuhan 430010, China
| | - Yuan Wei
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China.
| |
Collapse
|
13
|
Trujillo M, Odle AK, Aykin-Burns N, Allen AR. Chemotherapy induced oxidative stress in the ovary: drug-dependent mechanisms and potential interventions†. Biol Reprod 2023; 108:522-537. [PMID: 36539327 PMCID: PMC10106837 DOI: 10.1093/biolre/ioac222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/07/2022] [Accepted: 12/14/2022] [Indexed: 01/19/2023] Open
Abstract
Cancer incidence and relative survival are expected to increase over the next few decades. With the majority of patients receiving combinatorial chemotherapy, an increasing proportion of patients experience long-term side effects from treatment-including reproductive disorders and infertility. A limited number of studies have examined mechanisms of single-agent chemotherapy-induced gonadotoxicity, with chemotherapy-induced oxidative stress being implicated in the loss of reproductive functions. Current methods of female fertility preservation are costly, invasive, only moderately successful, and seldom presented to cancer patients. The potential of antioxidants to alleviate chemotherapy has been overlooked at a time when it is becoming increasingly important to develop strategies to protect reproductive functions during chemotherapy. This review will summarize the importance of reactive oxygen species homeostasis in reproduction, chemotherapy-induced mitochondrial dysfunction in oocytes, chemotherapy-induced oxidative stress, and several promising natural adjuvants.
Collapse
Affiliation(s)
- Madison Trujillo
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Neurobiology and Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Angela K Odle
- Department of Neurobiology and Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Nukhet Aykin-Burns
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Antiño R Allen
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Neurobiology and Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| |
Collapse
|
14
|
Murphy WA, Adiwidjaja J, Sjöstedt N, Yang K, Beaudoin JJ, Spires J, Siler SQ, Neuhoff S, Brouwer KLR. Considerations for Physiologically Based Modeling in Liver Disease: From Nonalcoholic Fatty Liver (NAFL) to Nonalcoholic Steatohepatitis (NASH). Clin Pharmacol Ther 2023; 113:275-297. [PMID: 35429164 PMCID: PMC10083989 DOI: 10.1002/cpt.2614] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 04/05/2022] [Indexed: 01/27/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD), representing a clinical spectrum ranging from nonalcoholic fatty liver (NAFL) to nonalcoholic steatohepatitis (NASH), is rapidly evolving into a global pandemic. Patients with NAFLD are burdened with high rates of metabolic syndrome-related comorbidities resulting in polypharmacy. Therefore, it is crucial to gain a better understanding of NAFLD-mediated changes in drug disposition and efficacy/toxicity. Despite extensive clinical pharmacokinetic data in cirrhosis, current knowledge concerning pharmacokinetic alterations in NAFLD, particularly at different stages of disease progression, is relatively limited. In vitro-to-in vivo extrapolation coupled with physiologically based pharmacokinetic and pharmacodynamic (IVIVE-PBPK/PD) modeling offers a promising approach for optimizing pharmacologic predictions while refining and reducing clinical studies in this population. Use of IVIVE-PBPK to predict intra-organ drug concentrations at pharmacologically relevant sites of action is particularly advantageous when it can be linked to pharmacodynamic effects. Quantitative systems pharmacology/toxicology (QSP/QST) modeling can be used to translate pharmacokinetic and pharmacodynamic data from PBPK/PD models into clinically relevant predictions of drug response and toxicity. In this review, a detailed summary of NAFLD-mediated alterations in human physiology relevant to drug absorption, distribution, metabolism, and excretion (ADME) is provided. The application of literature-derived physiologic parameters and ADME-associated protein abundance data to inform virtual NAFLD population development and facilitate PBPK/PD, QSP, and QST predictions is discussed along with current limitations of these methodologies and knowledge gaps. The proposed methodologic framework offers great potential for meaningful prediction of pharmacological outcomes in patients with NAFLD and can inform both drug development and clinical practice for this population.
Collapse
Affiliation(s)
- William A Murphy
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Jeffry Adiwidjaja
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Simulations Plus, Inc., Lancaster, California, USA
| | - Noora Sjöstedt
- Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Kyunghee Yang
- DILIsym Services Division, Simulations Plus Inc., Research Triangle Park, North Carolina, USA
| | - James J Beaudoin
- DILIsym Services Division, Simulations Plus Inc., Research Triangle Park, North Carolina, USA
| | | | - Scott Q Siler
- DILIsym Services Division, Simulations Plus Inc., Research Triangle Park, North Carolina, USA
| | | | - Kim L R Brouwer
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| |
Collapse
|
15
|
Yan L, Luo H, Tang X, Wang H. Cannabinoids inhibit ethanol-induced activation of liver toxicity in rats through JNK/ERK/MAPK signaling pathways. J Biochem Mol Toxicol 2023; 37:e23260. [PMID: 36453646 DOI: 10.1002/jbt.23260] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 09/24/2022] [Accepted: 11/15/2022] [Indexed: 12/03/2022]
Abstract
Cannabinoids (CBs) are psychoactive compounds, with reported anticancer, anti-inflammatory, and anti-neoplastic properties. The study was aimed at assessing the hepatoprotective effects of CB against ethanol (EtOH)-induced liver toxicity in rats. The animals were divided into seven groups: control (Group I) and Group II were treated with 50% ethanol (EtOH 5 mg/kg). Groups III, IV, and VI were treated with (EtOH + CB 10 mg/kg), (EtOH + CB 20 mg/kg), and (EtOH + CB 30 mg/kg), respectively. Groups V and VII consisted of animals treated with 20 and 30 mg/kg, of CB, respectively. Biochemical analysis revealed that Group IV (EtOH + CB 20 mg/kg) had reduced levels of ALT-alanine transferase, AST-aspartate aminotransferase, ALP-alanine peroxidase, MDA-malondialdehyde and increased levels of GSH-reduced glutathione. Histopathological analysis of liver and kidney tissues showed that EtOH + CB (20 and 30 mg/kg) treated animal groups exhibited normal tissue architecture similar to that of the control group. ELISA revealed that the inflammatory markers were reduced in the animal groups that were treated with EtOH + CB 20 mg/kg, in comparison to the animals treated only with EtOH. The mRNA expression levels of COX-2, CD-14, and MIP-2 showed a remarkable decrease in EtOH + CB treated animal groups to control groups. Western blot analysis revealed that CB downregulated p38/JNK/ERK thereby exhibiting its hepatoprotective property by inhibiting mitogen-activated protein kinase pathways. Thus, our findings suggest that CB is a potential candidate for the treatment of alcohol-induced hepatotoxicity.
Collapse
Affiliation(s)
- Lei Yan
- Clinical Experimental Centre, Xi'an International Medical Center Hospital, Xi'an, Shaanxi Province, China.,M.Kandiah Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Bandar Sungai Long, Selangor, Malaysia.,Xi'an Engineering Technology Research Center for Cardiovascular Active Peptide, Xi'an, Shaanxi Province, China
| | - Heng Luo
- Reproductive Medicine Center, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Xiaolu Tang
- Department of Neurosurgery, The Second Affiliated Hospital of Xi'an Medical University, Xi'an, Shaanxi Province, China
| | - Haidong Wang
- Inpatient Clinical Laboratory Department, The Second Affiliated Hospital of Xi'an Medical University, Xi'an, Shaanxi Province, China
| |
Collapse
|
16
|
Wang Y, Charkoftaki G, Davidson E, Orlicky DJ, Tanguay RL, Thompson DC, Vasiliou V, Chen Y. Oxidative stress, glutathione, and CYP2E1 in 1,4-dioxane liver cytotoxicity and genotoxicity: insights from animal models. CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH 2022; 29:100389. [PMID: 37483863 PMCID: PMC10361651 DOI: 10.1016/j.coesh.2022.100389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
1,4-Dioxane (DX) is an emerging drinking water contaminant worldwide, which poses a threat to public health due to its demonstrated liver carcinogenicity and potential for human exposure. The lack of drinking water standards for DX is attributed to undetermined mechanisms of DX carcinogenicity. This mini-review provides a brief discussion of a series of mechanistic studies, wherein unique mouse models were exposed to DX in drinking water to elucidate redox changes associated with DX cytotoxicity and genotoxicity. The overall conclusions from these studies support a direct genotoxic effect by high dose DX and imply that oxidative stress involving CYP2E1 activation may play a causal role in DX liver genotoxicity and potentially carcinogenicity. The mechanistic data derived from these studies can serve as important references to refine the assessment of carcinogenic pathways that may be triggered at environmentally relevant low doses of DX in future animal and human studies.
Collapse
Affiliation(s)
- Yewei Wang
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Georgia Charkoftaki
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Emily Davidson
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
- Department of Cellular & Molecular Physiology, Yale School of Medicine, Yale University, New Haven, CT 06510, USA
| | - David J. Orlicky
- Department of Pathology, School of Medicine, University of Colorado Anschutz Medical Center, University of Colorado, Aurora, CO 80045, USA
| | - Robyn L. Tanguay
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA
| | - David C. Thompson
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Vasilis Vasiliou
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Ying Chen
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| |
Collapse
|
17
|
Maksymchuk O, Shysh A, Stroy D. Treatment with omega-3 PUFAs does not increase the risk of CYP2E1-dependent oxidative stress and diabetic liver pathology. Front Endocrinol (Lausanne) 2022; 13:1004564. [PMID: 36225205 PMCID: PMC9550212 DOI: 10.3389/fendo.2022.1004564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 08/30/2022] [Indexed: 11/13/2022] Open
Abstract
An increase in CYP2E1 expression is a key factor in the development of diabetic oxidative liver damage. Long-term treatment with omega-3 PUFAs, which are CYP2E1 substrates, may affect CYP2E1 expression in the liver. In this work, we performed Western blot analysis, biochemical methods, and microscopic ultrastructural studies of the liver in a streptozotocin-induced rat model of type 1 diabetes to investigate whether long-term treatment with omega-3 PUFAs could induce CYP2E1-dependent oxidative stress and diabetic liver pathology. Significant hyperglycemia and lack of natural weight gain were observed in the diabetic rats compared to non-diabetic controls. A 2.5-fold increase in CYP2E1 expression (protein content and activity) was also observed in the diabetic rats. In addition, signs of oxidative stress were found in the liver of the diabetic rats. A significant increase in transaminases and GGT level in blood serum was also observed, which could indicate marked destruction of liver tissue. Diabetic dyslipidemia (increased triacylglycerol levels and decreased HDL-C levels) was found. Treatment of the diabetic animals with an omega-3-enriched pharmaceutical composition of PUFAs had no effect on CYP2E1 levels but contributed to a two-fold decrease in enzyme activity. The intensity of lipid peroxidation also remained close to the diabetic group. However, at the same time, antioxidant protection was provided by induction of antioxidant enzyme activity. Examination of the liver ultrastructure revealed no characteristic signs of diabetic pathology. However, omega-3 PUFAs did not normalize blood glucose levels and serum lipid profile. Thus, long-term treatment of diabetic rats with omega-3 PUFAs does not increase the risk of CYP2E1-dependent oxidative stress and development of liver pathology but prevents some diabetic ultrastructural damage to hepatocytes.
Collapse
Affiliation(s)
- Oksana Maksymchuk
- Department of Molecular Oncogenetics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Angela Shysh
- Department of General and Molecular Pathophysiology, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Dmytro Stroy
- Department of General and Molecular Pathophysiology, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| |
Collapse
|
18
|
Sandoval C, Mella L, Godoy K, Adeli K, Farías J. β-Carotene Increases Activity of Cytochrome P450 2E1 during Ethanol Consumption. Antioxidants (Basel) 2022; 11:antiox11051033. [PMID: 35624897 PMCID: PMC9137679 DOI: 10.3390/antiox11051033] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/27/2022] [Accepted: 05/13/2022] [Indexed: 02/01/2023] Open
Abstract
One of the key routes through which ethanol induces oxidative stress appears to be the activation of cytochrome P450 2E1 at different levels of ethanol intake. Our aim was to determine if oral β-carotene intake had an antioxidant effect on CYP2E1 gene expression in mice that had previously consumed ethanol. C57BL/6 mice were used and distributed into: control (C), low-dose alcohol (LA), moderate-dose alcohol (MA), β-carotene (B), low-dose alcohol+β-carotene (LA + B), and moderate-dose alcohol+β-carotene (MA + B). Animals were euthanized at the end of the experiment, and liver tissue was taken from each one. CYP2E1 was measured using qPCR to detect liver damage. The relative expression level of each RNA was estimated using the comparative threshold cycle (Ct) technique (2−ΔΔCT method) by averaging the Ct values from three replicates. The LA+B (2267 ± 0.707) and MA+B (2.307 ± 0.384) groups had the highest CYP2E1 fold change values. On the other hand, the C (1.053 ± 0.292) and LA (1.240 ± 0.163) groups had the lowest levels. These results suggest that ethanol feeding produced a fold increase in CYP2E1 protein in mice as compared to the control group. Increased CYP2E1 activity was found to support the hypothesis that β-carotene might be dangerous during ethanol exposure in animal models. Our findings imply that β-carotene can increase the hepatic damage caused by low and high doses of alcohol. Therefore, the quantity of alcohol ingested, the exposure period, the regulatory mechanisms of alcoholic liver damage, and the signaling pathways involved in the consumption of both alcohol and antioxidant must all be considered.
Collapse
Affiliation(s)
- Cristian Sandoval
- Escuela de Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Los Carreras 753, Osorno 5310431, Chile
- Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco 4811230, Chile
- Departamento de Ciencias Preclínicas, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile
- Correspondence: (C.S.); (J.F.); Tel.: +56-45-2325720 (C.S.); +56-45-2325956 (J.F.)
| | - Luciana Mella
- Carrera de Tecnología Médica, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile;
| | - Karina Godoy
- Núcleo Científico y Tecnológico en Biorecursos (BIOREN), Universidad de La Frontera, Temuco 4811230, Chile;
| | - Khosrow Adeli
- Molecular Medicine, Research Institute The Hospital for Sick Children University of Toronto, Toronto, ON M5G 1X8, Canada;
| | - Jorge Farías
- Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco 4811230, Chile
- Núcleo Científico y Tecnológico en Biorecursos (BIOREN), Universidad de La Frontera, Temuco 4811230, Chile;
- Correspondence: (C.S.); (J.F.); Tel.: +56-45-2325720 (C.S.); +56-45-2325956 (J.F.)
| |
Collapse
|
19
|
Sandoval C, Farías J, Zamorano M, Herrera C. Vitamin Supplements as a Nutritional Strategy against Chronic Alcohol Consumption? An Updated Review. Antioxidants (Basel) 2022; 11:antiox11030564. [PMID: 35326214 PMCID: PMC8945215 DOI: 10.3390/antiox11030564] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/12/2022] [Accepted: 03/12/2022] [Indexed: 02/07/2023] Open
Abstract
Several studies have shown that blood vitamin levels are low in alcoholic patients. In effect, alcohol use abuse is considered a chronic disease that promotes the pathogenesis of many fatal diseases, such as cancer and liver cirrhosis. The alcohol effects in the liver can be prevented by antioxidant mechanisms, which induces enzymatic as well as other nonenzymatic pathways. The effectiveness of several antioxidants has been evaluated. However, these studies have been accompanied by uncertainty as mixed results were reported. Thus, the aim of the present review article was to examine the current knowledge on vitamin deficiency and its role in chronic liver disease. Our review found that deficiencies in nutritional vitamins could develop rapidly during chronic liver disease due to diminished hepatic storage and that inadequate vitamins intake and alcohol consumption may interact to deplete vitamin levels. Numerous studies have described that vitamin supplementation could reduce hepatotoxicity. However, further studies with reference to the changes in vitamin status and the nutritional management of chronic liver disease are in demand.
Collapse
Affiliation(s)
- Cristian Sandoval
- Escuela de Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Los Carreras 753, Osorno 5310431, Chile
- Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco 4811230, Chile; (J.F.); (M.Z.)
- Departamento de Ciencias Preclínicas, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile;
- Correspondence: ; Tel.: +56-45-2325720
| | - Jorge Farías
- Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco 4811230, Chile; (J.F.); (M.Z.)
- Núcleo Científico y Tecnológico en Biorecursos (BIOREN), Universidad de La Frontera, Temuco 4811230, Chile
| | - Mauricio Zamorano
- Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco 4811230, Chile; (J.F.); (M.Z.)
- Núcleo Científico y Tecnológico en Biorecursos (BIOREN), Universidad de La Frontera, Temuco 4811230, Chile
| | - Christian Herrera
- Departamento de Ciencias Preclínicas, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile;
| |
Collapse
|
20
|
Chen Y, Wang Y, Charkoftaki G, Orlicky DJ, Davidson E, Wan F, Ginsberg G, Thompson DC, Vasiliou V. Oxidative stress and genotoxicity in 1,4-dioxane liver toxicity as evidenced in a mouse model of glutathione deficiency. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150703. [PMID: 34600989 PMCID: PMC8633123 DOI: 10.1016/j.scitotenv.2021.150703] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 09/27/2021] [Accepted: 09/27/2021] [Indexed: 05/19/2023]
Abstract
1,4-Dioxane (DX) is a synthetic chemical used as a stabilizer for industrial solvents. Recent occurrence data show widespread and significant contamination of drinking water with DX in the US. DX is classified by the International Agency for Research on Cancer as a group 2B carcinogen with the primary target organ being the liver in animal studies. Despite the exposure and cancer risk, US EPA has not established a drinking water Maximum Contaminant Level (MCL) for DX and a wide range of drinking water targets have been established across the US and by Health Canada. The DX carcinogenic mechanism remains unknown; this information gap contributes to the varied approaches to its regulation. Our recent mice study indicated alterations in oxidative stress response accompanying DNA damage as an early change by high dose DX (5000 ppm) in drinking water. Herein, we report a follow-up study, in which we used glutathione (GSH)-deficient glutamate-cysteine ligase modifier subunit (Gclm)-null mice to investigate the role of redox homeostasis in DX-induced liver cytotoxicity and genotoxicity. Gclm-null and wild-type mice were exposed to DX for one week (1000 mg/kg/day by oral gavage) or three months (5000 ppm in drinking water). Subchronic exposure of high dose DX caused mild liver cytotoxicity. DX induced assorted molecular changes in the liver including: (i) a compensatory nuclear factor erythroid 2-related factor 2 (NRF2) anti-oxidative response at the early stage (one week), (ii) progressive CYP2E1 induction, (iii) development of oxidative stress, as evidenced by persistent NRF2 induction, oxidation of GSH pool, and accumulation of the lipid peroxidation by-product 4-hydroxynonenal, and (iv) elevations in oxidative DNA damage and DNA repair response. These DX-elicited changes were exaggerated in GSH-deficient mice. Collectively, the current study provides additional evidence linking redox dysregulation to DX liver genotoxicity, implying oxidative stress as a candidate mechanism of DX liver carcinogenicity.
Collapse
Affiliation(s)
- Ying Chen
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA.
| | - Yewei Wang
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Georgia Charkoftaki
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - David J Orlicky
- Department of Pathology, School of Medicine, University of Colorado Anschutz Medical Center, University of Colorado, Aurora, CO 80045, USA
| | - Emily Davidson
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA; Department of Cellular & Molecular Physiology, Yale School of Medicine, Yale University, New Haven, CT 06510, USA
| | - Fengjie Wan
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Gary Ginsberg
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - David C Thompson
- Department of Clinical Pharmacy, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado, Aurora, CO 80045, USA
| | - Vasilis Vasiliou
- Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT 06510, USA.
| |
Collapse
|
21
|
Jiang HY, Bao YN, Lin FM, Jin Y. Triptolide regulates oxidative stress and inflammation leading to hepatotoxicity via inducing CYP2E1. Hum Exp Toxicol 2021; 40:S775-S787. [PMID: 34758665 DOI: 10.1177/09603271211056330] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Triptolide (TP), the main active compound extracted from medicine-tripterygium wilfordii Hook f. (TWHF). It has anti-tumor and immunomodulatory properties. Our study aimed to investigate the mechanisms of hepatotoxicity treated with TP in vivo and in vitro, as well as their relationship with the NF-κB (p65) signal pathway; and to assess TP-induced hepatotoxicity after CYP2E1 modulation by the known inhibitor, clomethiazole, and the known inducer, pyrazole. Mice were given TP to cause liver injury and IHHA-1 cells were given TP to cause hepatocyte injury. The enzyme activity and hepatotoxicity changed dramatically when the CYP2E1 inhibitor and inducer were added. In comparison to the control group, the enzyme inducer increased the activity of CYP2E1, whereas the enzyme inhibitor had the opposite effect. Our findings suggest that TP is an inducer of CYP2E1 via a time-dependent activation mechanism. In addition, TP can promote oxidative stress, inflammatory and involving the NF-κB (p65) signal pathway. Therefore, we used triptolide to stimulate C57 mice and IHHA-1 cells to determine whether TP can promote oxidative stress and inflammation by activating CYP2E1 in response to exacerbated liver damage and participate in NF-κB (p65) signaling pathway.
Collapse
Affiliation(s)
- Hai-Yan Jiang
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Yan-Ni Bao
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Feng-Mei Lin
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Yong Jin
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| |
Collapse
|
22
|
Pang S, Dong W, Liu N, Gao S, Li J, Zhang X, Lu D, Zhang L. Diallyl sulfide protects against dilated cardiomyopathy via inhibition of oxidative stress and apoptosis in mice. Mol Med Rep 2021; 24:852. [PMID: 34651661 PMCID: PMC8532119 DOI: 10.3892/mmr.2021.12492] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 08/26/2021] [Indexed: 11/21/2022] Open
Abstract
Cytochrome P450 family 2 subfamily E member 1 (CYP2E1) is a member of the cytochrome P450 enzyme family and catalyzes the metabolism of various substrates. CYP2E1 is upregulated in multiple heart diseases and causes damage mainly via the production of reactive oxygen species (ROS). In mice, increased CYP2E1 expression induces cardiac myocyte apoptosis, and knockdown of endogenous CYP2E1 can attenuate the pathological development of dilated cardiomyopathy (DCM). Nevertheless, targeted inhibition of CYP2E1 via the administration of drugs for the treatment of DCM remains elusive. Therefore, the present study aimed to investigate whether diallyl sulfide (DAS), a competitive inhibitor of CYP2E1, can be used to inhibit the development of the pathological process of DCM and identify its possible mechanism. Here, cTnTR141W transgenic mice, which developed typical DCM phenotypes, were used. Following treatment with DAS for 6 weeks, echocardiography, histological analysis and molecular marker detection were conducted to investigate the DAS-induced improvement on myocardial function and morphology. Biochemical analysis, western blotting and TUNEL assays were used to detected ROS production and myocyte apoptosis. It was found that DAS improved the typical DCM phenotypes, including chamber dilation, wall thinning, fibrosis, poor myofibril organization and decreased ventricular blood ejection, as determined using echocardiographic and histopathological analyses. Furthermore, the regulatory mechanisms, including inhibition both of the oxidative stress levels and the mitochondria-dependent apoptosis pathways, were involved in the effects of DAS. In particular, DAS showed advantages in terms of improved chamber dilation and dysfunction in model mice, and the improvement occurred in the early stage of the treatment compared with enalaprilat, an angiotensin-converting enzyme inhibitor that has been widely used in the clinical treatment of DCM and HF. The current results demonstrated that DAS could protect against DCM via inhibition of oxidative stress and apoptosis. These findings also suggest that inhibition of CYP2E1 may be a valuable therapeutic strategy to control the development of heart diseases, especially those associated with CYP2E1 upregulation. Moreover, the development of DAS analogues with lower cytotoxicity and metabolic rate for CYP2E1 may be beneficial.
Collapse
Affiliation(s)
- Shuo Pang
- Key Laboratory of Human Disease Comparative Medicine, National Health Commission of China (NHC), Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Wei Dong
- Key Laboratory of Human Disease Comparative Medicine, National Health Commission of China (NHC), Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Ning Liu
- Beijing Engineering Research Center for Experimental Animal Models of Human Diseases, Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Shan Gao
- Key Laboratory of Human Disease Comparative Medicine, National Health Commission of China (NHC), Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Jing Li
- Beijing Engineering Research Center for Experimental Animal Models of Human Diseases, Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Xu Zhang
- Beijing Engineering Research Center for Experimental Animal Models of Human Diseases, Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Dan Lu
- Beijing Engineering Research Center for Experimental Animal Models of Human Diseases, Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| | - Lianfeng Zhang
- Key Laboratory of Human Disease Comparative Medicine, National Health Commission of China (NHC), Institute of Laboratory Animal Science, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
| |
Collapse
|
23
|
Singh D, Yadav A, Singh C. Autonomous regulation of inducible nitric oxide synthase and cytochrome P450 2E1-mediated oxidative stress in maneb- and paraquat-treated rat polymorphs. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 178:104944. [PMID: 34446210 DOI: 10.1016/j.pestbp.2021.104944] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/28/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Maneb (MB)- and paraquat (PQ)-induced oxidative stress in rat polymorphonuclear leukocytes (PMNs) is regulated in parallel by cytochrome P450 2E1 (CYP2E1) and inducible nitric oxide synthase (iNOS). However, mechanism underlying their regulation is not yet understood. The study investigated the role of nuclear factor- kappa B (NF-κB) and mitogen-activated protein kinase/extracellular signal regulated kinase/protein kinase C (MEK/ERK/PKC) pathway in the regulation of iNOS- and CYP2E1-induced oxidative stress in PMNs. MB + PQ-induced changes in nitrite content, lipid peroxidation (LPO), iNOS expression/activity and inflammatory mediators were alleviated by aminoguanidine (AG), an iNOS inhibitor, without any change in CYP2E1. Alternatively, diallyl sulphide (DAS), a CYP2E1 inhibitor, rescued from MB + PQ-induced changes in CYP2E1 activity/expression, free radical generation, superoxide dismutase (SOD) activity, LPO and pro-inflammatory cytokines without any alterations in nitrite content and iNOS activity/expression. Pyrrolidine dithiocarbamate (PDTC), NF-κB inhibitor, did not alter CYP2E1 but mitigated free radical generation, SOD activity, LPO, nitrite content, iNOS activity/expression and levels of pro-inflammatory cytokines (tumor necrosis factor-α, interleukine-1β and interleukine-4). Ex-vivo treatment with MEK inhibitor (PD98059), ERK1/2 inhibitor (AG126) or PKC inhibitor (rottlerin) ameliorated MB + PQ-induced increase in free radical generation and CYP2E1 activity/expression in PMNs. While PD98059 and AG126 abated MB + PQ-induced increase in ERK1/2, PKC-α/δ and CYP2E1 levels, rottlerin restored PKC-α/δ and CYP2E1 towards normalcy without affecting ERK1/2 level in MB + PQ-treated group. The results suggest that iNOS and CYP2E1 contributing to MB + PQ-induced oxidative stress in rat PMNs exhibit differential regulatory mechanisms. The inflammatory mediators regulate iNOS expression while CYP2E1 expression is triggered via MEK-ERK1/2-PKC pathway.
Collapse
Affiliation(s)
- Deepali Singh
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, Uttar Pradesh, India
| | - Archana Yadav
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, Uttar Pradesh, India
| | - Chetna Singh
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, Uttar Pradesh, India.
| |
Collapse
|
24
|
Ma HL, Chen SD, Zheng KI, Yu Y, Wang XX, Tang LJ, Li G, Rios RS, Huang OY, Zheng XY, Xu RA, Targher G, Byrne CD, Wang XD, Chen YP, Zheng MH. TA allele of rs2070673 in the CYP2E1 gene is associated with lobular inflammation and nonalcoholic steatohepatitis in patients with biopsy-proven nonalcoholic fatty liver disease. J Gastroenterol Hepatol 2021; 36:2925-2934. [PMID: 34031913 DOI: 10.1111/jgh.15554] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 05/10/2021] [Accepted: 05/21/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND AIM Cytochrome P450 2E1 (CYP2E1) plays a role in lipid metabolism, and by increasing hepatic oxidative stress and inflammation, the upregulation of CYP2E1 is involved in development of nonalcoholic steatohepatitis (NASH). We aimed to explore the relationship between CYP2E1-333A>T (rs2070673) and the histological severity of nonalcoholic fatty liver disease (NAFLD). METHODS We studied 438 patients with biopsy-proven NAFLD. NASH was defined as NAFLD Activity Score ≥ 5 with existence of steatosis, ballooning, and lobular inflammation. CYP2E1-333A>T (rs2070673) was genotyped by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Serum cytokines related to inflammation were measured by the Bio-plex 200 system to investigate possible mediating factors involved in the process. RESULTS The TA genotype of rs2070673 had a higher prevalence of moderate/severe lobular inflammation (27.6% vs 20.3% vs 13.3%, P < 0.01) and NASH (55.7% vs 42.4% vs 40.5%, P < 0.01) compared with the AA and TT genotypes, respectively. In multivariable regression modeling, the heterozygote state TA was associated with moderate/severe lobular inflammation (adjusted odds ratio: 2.31, 95% confidence interval 1.41-3.78, P < 0.01) or NASH (adjusted odds ratio: 1.82, 95% confidence interval 1.22-2.69, P < 0.01), independently of age, sex, common metabolic risk factors, and presence of liver fibrosis. Compared with no-NASH, NASH patients had significantly higher levels of serum interleukin-1 receptor antagonist, interleukin-18, and interferon-inducible protein-10 (IP-10), whereas only IP-10 was increased with the rs2070673 TA variant (P = 0.01). Mediation analysis showed that IP-10 was responsible for ~60% of the association between the rs2070672 and NASH. CONCLUSIONS The TA allele of rs2070673 is strongly associated with lobular inflammation and NASH, and this effect appears to be largely mediated by serum IP-10 levels.
Collapse
Affiliation(s)
- Hong-Lei Ma
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Sui-Dan Chen
- Department of Pathology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Kenneth I Zheng
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yue Yu
- Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xin-Xin Wang
- Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Liang-Jie Tang
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Gang Li
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Rafael S Rios
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ou-Yang Huang
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xiao-Yong Zheng
- Department of Laboratory Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ren-Ai Xu
- Department of Pharmacy, Zhejiang Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Giovanni Targher
- Section of Endocrinology, Diabetes and Metabolism, Department of Medicine, University and Azienda Ospedaliera Universitaria Integrata of Verona, Verona, Italy
| | - Christopher D Byrne
- Southampton National Institute for Health Research Biomedical Research Centre, University Hospital Southampton, Southampton General Hospital, Southampton, UK
| | - Xiao-Dong Wang
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.,Institute of Hepatology, Wenzhou Medical University, Wenzhou, China.,Key Laboratory of Diagnosis and Treatment for The Development of Chronic Liver Disease in Zhejiang Province, Wenzhou, China
| | - Yong-Ping Chen
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.,Institute of Hepatology, Wenzhou Medical University, Wenzhou, China.,Key Laboratory of Diagnosis and Treatment for The Development of Chronic Liver Disease in Zhejiang Province, Wenzhou, China
| | - Ming-Hua Zheng
- NAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.,Institute of Hepatology, Wenzhou Medical University, Wenzhou, China.,Key Laboratory of Diagnosis and Treatment for The Development of Chronic Liver Disease in Zhejiang Province, Wenzhou, China
| |
Collapse
|
25
|
Drug Repurposing in Alternative Medicine: Sochehwan, a Polyherbal Traditional Korean Digestant, Protects against Alcoholic Steatohepatitis by Regulating Cytochrome P450 2E1 Expression. Processes (Basel) 2021. [DOI: 10.3390/pr9101760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Sochehwan (SCH) is an herbal prescription from traditional oriental medicine and is currently used to treat digestive ailments. In a previous study, SCH was found to have the potential to attenuate metabolic syndrome (MetS) by activating AMPK and downstream signaling. From the view of drug repurposing, the efficacy of SCH on alcoholic liver injury is implied in classic medical texts but is yet to be proven. C57BL/6J mice were pre-treated with SCH orally for 5 days and challenged by providing a pair-fed Lieber DeCarli diet containing alcohol for 20 days. Hepatic enzyme and triglyceride levels and endoplasmic reticulum (ER) stress-related markers were analyzed. Moreover, mitogen-activated protein kinases (MAPKs) and cytochrome P450 2E1 (CYP2E1) levels were determined. CYP2E1-transfected HepG2 cells were used to test the cytoprotective efficacy of SCH against the adverse effects of alcohol in vitro. In mice, SCH administration notably reduced hepatic enzyme activity and neural lipid levels. Furthermore, ER-stress markers and MAPK phosphorylation were reduced due to ROS suppression, which was attributed to decreased CYP2E1 expression in liver tissue. In addition, SCH successfully protected CYP2E1-transfected HepG2 cells against ethanol. Our findings suggest SCH attenuated alcohol-induced liver injury by inhibiting CYP2E1 expression and indicate drug repurposing should be considered as a valuable option for drug development in traditional herbal medicines.
Collapse
|
26
|
Park JS, Ma H, Roh YS. Ubiquitin pathways regulate the pathogenesis of chronic liver disease. Biochem Pharmacol 2021; 193:114764. [PMID: 34529948 DOI: 10.1016/j.bcp.2021.114764] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/05/2021] [Accepted: 09/08/2021] [Indexed: 02/07/2023]
Abstract
Chronic liver disease (CLD) is considered the leading cause of global mortality. In westernized countries, increased consumption of alcohol and overeating foods with high fat/ high glucose promote progression of CLD such as alcoholic liver disease (ALD) and non-alcoholic liver disease (NAFLD). Accumulating evidence and research suggest that ubiquitin, a 75 amino acid protein, plays crucial role in the pathogenesis of CLD through dynamic post-translational modifications (PTMs) exerting diverse cellular outcomes such as protein degradation through ubiquitin-proteasome system (UPS) and autophagy, and regulation of signal transduction. In this review, we present the function of ubiquitination and latest findings on diverse mechanism of PTMs, UPS and autophagy which significantly contribute to the pathogenesis of alcoholic liver disease (ALD), non-alcoholic fatty liver disease (NAFLD), cirrhosis, and HCC. Despite its high prevalence, morbidity, and mortality, there are only few FDA approved drugs that could be administered to CLD patients. The goal of this review is to present a variety of pathways and therapeutic targets involving ubiquitination in the pathogenesis of CLD. Further, this review summarizes collective views of pharmaceutical inhibition or activation of recent drugs targeting UPS and autophagy system to highlight potential targets and new approaches to treat CLD.
Collapse
Affiliation(s)
- Jeong-Su Park
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju 28160, South Korea
| | - Hwan Ma
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju 28160, South Korea
| | - Yoon-Seok Roh
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju 28160, South Korea.
| |
Collapse
|
27
|
Carrasco D, Carrasco C, Souza-Mello V, Sandoval C. Effectiveness of antioxidant treatments on cytochrome P450 2E1 (CYP2E1) activity after alcohol exposure in humans and in vitro models: A systematic review. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2021. [DOI: 10.1080/10942912.2021.1961801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Danitza Carrasco
- Carrera De Tecnología Médica, Facultad De Medicina, Universidad De La Frontera, Temuco, Chile
| | - Camila Carrasco
- Carrera De Tecnología Médica, Facultad De Medicina, Universidad De La Frontera, Temuco, Chile
| | - Vanessa Souza-Mello
- Laboratorio De Morfometría, Metabolismo Y Enfermedades Cardiovasculares, Centro Biomédico, Instituto De Biología, Universidade Do Estado Do Rio De Janeiro, Rio De Janeiro, Brazil
| | - Cristian Sandoval
- Escuela de Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Los Carreras, Osorno, Chile
- Departamento De Ciencias Preclínicas, Facultad De Medicina, Universidad De La Frontera, Temuco, Chile
| |
Collapse
|
28
|
CYP2E1 in Alcoholic and Non-Alcoholic Liver Injury. Roles of ROS, Reactive Intermediates and Lipid Overload. Int J Mol Sci 2021; 22:ijms22158221. [PMID: 34360999 PMCID: PMC8348366 DOI: 10.3390/ijms22158221] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/09/2021] [Accepted: 07/13/2021] [Indexed: 02/08/2023] Open
Abstract
CYP2E1 is one of the fifty-seven cytochrome P450 genes in the human genome and is highly conserved. CYP2E1 is a unique P450 enzyme because its heme iron is constitutively in the high spin state, allowing direct reduction of, e.g., dioxygen, causing the formation of a variety of reactive oxygen species and reduction of xenobiotics to toxic products. The CYP2E1 enzyme has been the focus of scientific interest due to (i) its important endogenous function in liver homeostasis, (ii) its ability to activate procarcinogens and to convert certain drugs, e.g., paracetamol and anesthetics, to cytotoxic end products, (iii) its unique ability to effectively reduce dioxygen to radical species causing liver injury, (iv) its capability to reduce compounds, often generating radical intermediates of direct toxic or indirect immunotoxic properties and (v) its contribution to the development of alcoholic liver disease, steatosis and NASH. In this overview, we present the discovery of the enzyme and studies in humans, 3D liver systems and genetically modified mice to disclose its function and clinical relevance. Induction of the CYP2E1 enzyme either by alcohol or high-fat diet leads to increased severity of liver pathology and likelihood to develop ALD and NASH, with subsequent influence on the occurrence of hepatocellular cancer. Thus, fat-dependent induction of the enzyme might provide a link between steatosis and fibrosis in the liver. We conclude that CYP2E1 has many important physiological functions and is a key enzyme for hepatic carcinogenesis, drug toxicity and liver disease.
Collapse
|
29
|
Negi CK, Khan S, Dirven H, Bajard L, Bláha L. Flame Retardants-Mediated Interferon Signaling in the Pathogenesis of Nonalcoholic Fatty Liver Disease. Int J Mol Sci 2021; 22:ijms22084282. [PMID: 33924165 PMCID: PMC8074384 DOI: 10.3390/ijms22084282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/14/2021] [Accepted: 04/16/2021] [Indexed: 02/06/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a growing concern worldwide, affecting 25% of the global population. NAFLD is a multifactorial disease with a broad spectrum of pathology includes steatosis, which gradually progresses to a more severe condition such as nonalcoholic steatohepatitis (NASH), fibrosis, cirrhosis, and eventually leads to hepatic cancer. Several risk factors, including exposure to environmental toxicants, are involved in the development and progression of NAFLD. Environmental factors may promote the development and progression of NAFLD by various biological alterations, including mitochondrial dysfunction, reactive oxygen species production, nuclear receptors dysregulation, and interference in inflammatory and immune-mediated signaling. Moreover, environmental contaminants can influence immune responses by impairing the immune system’s components and, ultimately, disease susceptibility. Flame retardants (FRs) are anthropogenic chemicals or mixtures that are being used to inhibit or delay the spread of fire. FRs have been employed in several household and outdoor products; therefore, human exposure is unavoidable. In this review, we summarized the potential mechanisms of FRs-associated immune and inflammatory signaling and their possible contribution to the development and progression of NAFLD, with an emphasis on FRs-mediated interferon signaling. Knowledge gaps are identified, and emerging pharmacotherapeutic molecules targeting the immune and inflammatory signaling for NAFLD are also discussed.
Collapse
Affiliation(s)
- Chander K. Negi
- Faculty of Science, RECETOX, Masaryk University, Kamenice 5, CZ62500 Brno, Czech Republic; (L.B.); (L.B.)
- Correspondence: or
| | - Sabbir Khan
- Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA;
| | - Hubert Dirven
- Department of Environmental Health, Section for Toxicology and Risk Assessment, Norwegian Institute of Public Health, 0456 Oslo, Norway;
| | - Lola Bajard
- Faculty of Science, RECETOX, Masaryk University, Kamenice 5, CZ62500 Brno, Czech Republic; (L.B.); (L.B.)
| | - Luděk Bláha
- Faculty of Science, RECETOX, Masaryk University, Kamenice 5, CZ62500 Brno, Czech Republic; (L.B.); (L.B.)
| |
Collapse
|
30
|
Xue D, Zhou X, Qiu J. Cytotoxicity mechanisms of plumbagin in drug-resistant tongue squamous cell carcinoma. J Pharm Pharmacol 2021; 73:98-109. [PMID: 33791802 DOI: 10.1093/jpp/rgaa027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 10/22/2020] [Indexed: 01/10/2023]
Abstract
OBJECTIVES To evaluate the inhibitory effect and mechanism of plumbagin (PLB) against drug-resistant tongue squamous cell carcinoma (TSCC), and whether its antitumour effect is not affected by tumour drug resistance. METHODS TSCC sensitive CAL27 cells and drug-resistant CAL27/RE cells were used to study the cytotoxicity and mechanism of PLB in vitro, including CCK-8 analysis, colony formation, DAPI staining, flow cytometry assay, transmission electron microscopy, western blotting assay, autophagy, apoptosis and ROS fluorescent probes. BALB/c nude mice xenograft models were used to study the growth inhibitory effect of PLB in vivo. KEY FINDINGS The results showed that the cell viability and proliferation inhibition and apoptosis induction abilities of PLB on drug-resistant cells were more obvious than that on sensitive cells. And PLB induced protective autophagy in TSCC cells. Mechanistically, PLB induced apoptosis and autophagy by generating reactive oxygen species to mediate JNK and AKT/mTOR pathways. Finally, the growth inhibitory effect of PLB against drug-resistant TSCC was also confirmed in vivo. CONCLUSIONS PLB will be a promising anticancer agent to overcome drug-resistant TSCC without being affected by its drug resistance properties.
Collapse
Affiliation(s)
- Danfeng Xue
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Xiongming Zhou
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Jiaxuan Qiu
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| |
Collapse
|
31
|
Cicuéndez B, Ruiz-Garrido I, Mora A, Sabio G. Stress kinases in the development of liver steatosis and hepatocellular carcinoma. Mol Metab 2021; 50:101190. [PMID: 33588102 PMCID: PMC8324677 DOI: 10.1016/j.molmet.2021.101190] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/31/2020] [Accepted: 02/09/2021] [Indexed: 02/07/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is an important component of metabolic syndrome and one of the most prevalent liver diseases worldwide. This disorder is closely linked to hepatic insulin resistance, lipotoxicity, and inflammation. Although the mechanisms that cause steatosis and chronic liver injury in NAFLD remain unclear, a key component of this process is the activation of stress-activated kinases (SAPKs), including p38 and JNK in the liver and immune system. This review summarizes findings which indicate that the dysregulation of stress kinases plays a fundamental role in the development of steatosis and are important players in inducing liver fibrosis. To avoid the development of steatohepatitis and liver cancer, SAPK activity must be tightly regulated not only in the hepatocytes but also in other tissues, including cells of the immune system. Possible cellular mechanisms of SAPK actions are discussed. Hepatic JNK triggers steatosis and insulin resistance, decreasing lipid oxidation and ketogenesis in HFD-fed mice. Decreased liver expression of p38α/β in HFD increases lipogenesis. Hepatic p38γ/δ drive insulin resistance and inhibit autophagy, which may lead to steatosis. Macrophage p38α/β promote cytokine production and M1 polarization, leading to lipid accumulation in hepatocytes. Myeloid p38γ/δ contribute to cytokine production and neutrophil migration, protecting against steatosis, diabetes and NAFLD. JNK1 and p38γ induce HCC while p38α blocks it. However, deletion of hepatic JNK1/2 induces cholangiocarcinoma. SAPK are potential therapeutic target for metabolic disorders, steatohepatitis and liver cancer.
Collapse
Affiliation(s)
- Beatriz Cicuéndez
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain
| | - Irene Ruiz-Garrido
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain
| | - Alfonso Mora
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain.
| | - Guadalupe Sabio
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain.
| |
Collapse
|
32
|
New insight and potential therapy for NAFLD: CYP2E1 and flavonoids. Biomed Pharmacother 2021; 137:111326. [PMID: 33556870 DOI: 10.1016/j.biopha.2021.111326] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 01/21/2021] [Accepted: 01/25/2021] [Indexed: 12/13/2022] Open
Abstract
Over the years, the prevalence of nonalcoholic fatty liver disease (NAFLD) has increased year by year; however, due to its complicated pathogenesis, there is no effective treatment so far. It is reported that Cytochrome P450 2E1 (CYP2E1) plays an indispensable role in the development of NAFLD, and numerous studies have shown that flavonoids have a hepatoprotective effect and can exert a beneficial effect on NAFLD by regulating the activity of CYP2E1. Therefore, flavonoids may become effective drugs for the treatment of NAFLD in the future. This prompted us to review the research progress of the pathological mechanism of NAFLD and the impact of CYP2E1 activity changes during the pathological process, and to summarize the protective effect of flavonoids against CYP2E1 activity.
Collapse
|
33
|
Rodriguez EA, Yamamoto BK. Toxic Effects of Methamphetamine on Perivascular Health: Co-morbid Effects of Stress and Alcohol Use Disorders. Curr Neuropharmacol 2021; 19:2092-2107. [PMID: 34344290 PMCID: PMC9185763 DOI: 10.2174/1570159x19666210803150023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 07/09/2021] [Accepted: 07/19/2021] [Indexed: 12/04/2022] Open
Abstract
Methamphetamine (Meth) abuse presents a global problem and commonly occurs with stress and/or alcohol use disorders. Regardless, the biological causes and consequences of these comorbidities are unclear. Whereas the mechanisms of Meth, stress, and alcohol abuse have been examined individually and well-characterized, these processes overlap significantly and can impact the neural and peripheral consequences of Meth. This review focuses on the deleterious cardio- and cerebrovascular effects of Meth, stress, alcohol abuse, and their comorbid effects on the brain and periphery. Points of emphasis are on the composition of the blood-brain barrier and their effects on the heart and vasculature. The autonomic nervous system, inflammation, and oxidative stress are specifically highlighted as common mediators of the toxic consequences to vascular and perivascular health. A significant portion of the Meth abusing population also presents with stress and alcohol use disorders, prompting a need to understand the mechanisms underlying their comorbidities. Little is known about their possible convergent effects. Therefore, the purpose of this critical review is to identify shared mechanisms of Meth, chronic stress, and alcohol abuse that contributes to the dysfunction of vascular health and underscores the need for studies that directly address their interactions.
Collapse
Affiliation(s)
- Eric A. Rodriguez
- Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Bryan K. Yamamoto
- Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| |
Collapse
|
34
|
Correia MA, Kwon D. Why Hepatic CYP2E1-Elevation by Itself Is Insufficient for Inciting NAFLD/NASH: Inferences from Two Genetic Knockout Mouse Models. BIOLOGY 2020; 9:biology9120419. [PMID: 33255949 PMCID: PMC7760898 DOI: 10.3390/biology9120419] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/19/2020] [Accepted: 11/20/2020] [Indexed: 02/07/2023]
Abstract
Hepatic cytochrome P450 CYP2E1 is an enzyme engaged in the metabolic biotransformation of various xenobiotics and endobiotics, resulting in both detoxification and/or metabolic activation of its substrates to more therapeutic or toxic products. Elevated hepatic CYP2E1 content is implicated in various metabolic diseases including alcoholic liver disease, nonalcoholic fatty liver disease (NAFLD)/nonalcoholic steatohepatitis (NASH), diabetes and obesity. While hepatic CYP2E1 elevation is considered essential to the pathogenesis of these liver diseases, our findings in two mouse models of E3 ubiquitin ligase genetic ablation fed a regular lab chow diet, argue that it is not sufficient for triggering NAFLD/NASH. Thus, albeit comparable hepatic CYP2E1 elevation and functional stabilization in these two models upon E3 ubiquitin ligase genetic ablation and consequent disruption of its ubiquitin-dependent proteasomal degradation, NAFLD/NASH was only observed in the mouse livers that exhibited concurrent SREBP1c-transcriptional upregulation of hepatic lipogenesis. These findings reinforce the critical complicity of an associated prolipogenic scenario induced by either an inherently upregulated hepatic lipogenesis or a high fat/high carbohydrate diet in CYP2E1-mediated NAFLD/NASH.
Collapse
Affiliation(s)
- Maria Almira Correia
- Departments of Cellular & Molecular Pharmacology, Pharmaceutical Chemistry, and Bioengineering and Therapeutic Sciences, and The Liver Center, University of California San Francisco, San Francisco, CA 94158-2517, USA
- Correspondence: ; Tel.: +1-415-476-5292
| | - Doyoung Kwon
- Departments of Cellular & Molecular Pharmacology, University of California San Francisco, San Francisco, CA 94158-2517, USA;
| |
Collapse
|
35
|
Chen X, Acquaah-Mensah GK, Denning KL, Peterson JM, Wang K, Denvir J, Hong F, Cederbaum AI, Lu Y. High-fat diet induces fibrosis in mice lacking CYP2A5 and PPARα: a new model for steatohepatitis-associated fibrosis. Am J Physiol Gastrointest Liver Physiol 2020; 319:G626-G635. [PMID: 32877213 PMCID: PMC8087345 DOI: 10.1152/ajpgi.00213.2020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Obesity is linked to nonalcoholic steatohepatitis. Peroxisome proliferator-activated receptor-α (PPARα) regulates lipid metabolism. Cytochrome P-450 2A5 (CYP2A5) is a potential antioxidant and CYP2A5 induction by ethanol is CYP2E1 dependent. High-fat diet (HFD)-induced obesity and steatosis are more severe in CYP2A5 knockout (cyp2a5-/-) mice than in wild-type mice although PPARα is elevated in cyp2a5-/- mice. To examine why the upregulated PPARα failed to prevent the enhanced steatosis in cyp2a5-/- mice, we abrogate the upregulated PPARα in cyp2a5-/- mice by cross-breeding cyp2a5-/- mice with PPARα knockout (pparα-/-) mice to create pparα-/-/cyp2a5-/- mice. The pparα-/-/cyp2a5-/- mice, pparα-/- mice, and cyp2a5-/- mice were fed HFD to induce steatosis. After HFD feeding, more severe steatosis was developed in pparα-/-/cyp2a5-/- mice than in pparα-/- mice and cyp2a5-/- mice. The pparα-/-/cyp2a5-/- mice and pparα-/- mice exhibited comparable and impaired lipid metabolism. Elevated serum alanine transaminase and liver interleukin-1β, liver inflammatory cell infiltration, and foci of hepatocellular ballooning were observed in pparα-/-/cyp2a5-/- mice but not in pparα-/- mice and cyp2a5-/- mice. In pparα-/-/cyp2a5-/- mice, although redox-sensitive transcription factor nuclear factor erythroid 2-related factor 2 and its target antioxidant genes were upregulated as a compensation, thioredoxin was suppressed, and phosphorylation of JNK and formation of nitrotyrosine adduct were increased. Liver glutathione was decreased, and lipid peroxidation was increased. Interestingly, inflammation and fibrosis were all observed within the clusters of lipid droplets, and these lipid droplet clusters were all located inside the area with CYP2E1-positive staining. These results suggest that HFD-induced fibrosis in pparα-/-/cyp2a5-/- mice is associated with steatosis, and CYP2A5 interacts with PPARα to participate in regulating steatohepatitis-associated fibrosis.
Collapse
Affiliation(s)
- Xue Chen
- 1Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia
| | - George K. Acquaah-Mensah
- 2Department of Pharmaceutical Sciences, Massachusetts College of Pharmacy and Health Sciences, Worcester, Massachusetts
| | - Krista L. Denning
- 3Department of Pathology, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia
| | - Jonathan M. Peterson
- 4Department of Health Sciences, College of Public Health, East Tennessee State University, Johnson City, Tennessee
| | - Kesheng Wang
- 5Department of Family and Community Health, School of Nursing, Health Sciences Center, West Virginia University, Morgantown, West Virginia
| | - James Denvir
- 1Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia
| | - Feng Hong
- 6Institute of Liver Diseases, Affiliated Hospital of Jining Medical University, Jining, China
| | - Arthur I. Cederbaum
- 7Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Yongke Lu
- 1Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia,8Department of Clinical and Translational Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia
| |
Collapse
|
36
|
Ishii N, Homma T, Guo X, Yamada KI, Yamada S, Fujii J. Ascorbic acid prevents N-nitrosodiethylamine-induced hepatic injury and hepatocarcinogenesis in Akr1a-knockout mice. Toxicol Lett 2020; 333:192-201. [PMID: 32805337 DOI: 10.1016/j.toxlet.2020.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 07/13/2020] [Accepted: 08/10/2020] [Indexed: 12/11/2022]
Abstract
To gain insights into the benefits of ascorbic acid (AsA) in hepatoprotection, we examined the status of Akr1a-/- (KO) mice, which biosynthesize AsA at about 10% the rate as Akr1a+/+ (WT) mice, in terms of their response to an N-nitrosodiethylamine (NDEA)-induced hepatic injury. The intraperitoneal injection of NDEA (35 mg/kg) started at 4 weeks of age and was performed at weekly intervals thereafter. While the fatality rate was substantial in the KO mice, AsA supplementation (1.5 mg/ml in the drinking water) greatly extended their life-spans. Only two out of 54 KO mice survived to 28 weeks, and both contained approximately an order of magnitude greater number of tumor nodules compared to WT mice or KO mice with AsA supplementation. Histological and biochemical examinations at 20 weeks indicated that AsA potently protected against the hepatotoxic action of NDEA. Interestingly, the AsA levels in the liver were higher in the AsA-supplemented KO mouse groups that had received the NDEA treatment compared to the corresponding control group. While the protein levels of Cyp2e1, an enzyme that plays a major role in the bioactivation of NDEA, had declined to a similar extent among the experimental groups, p-nitrophenol-oxidizing activity was sustained at high levels in the KO mouse livers but AsA supplementation suppressed this activity. These findings confirm that AsA is a potent micronutrient that copes with hepatic injury and cancer development caused by exposure to NDEA in the livers of Akr1a-knockout mice.
Collapse
Affiliation(s)
- Naoki Ishii
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, 990-9585, Japan
| | - Takujiro Homma
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, 990-9585, Japan
| | - Xin Guo
- Department of Pathology and Laboratory Medicine, Kanazawa Medical University, 1-1 Uchinada, Ishikawa, 920-0293, Japan
| | - Ken-Ichi Yamada
- Physical Chemistry for Life Science Laboratory, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi Higashi-ku, Fukuoka 812-8582, Japan; AMED-CREST, Japan Agency for Medical Research and Development, Tokyo, Japan
| | - Sohsuke Yamada
- Department of Pathology and Laboratory Medicine, Kanazawa Medical University, 1-1 Uchinada, Ishikawa, 920-0293, Japan
| | - Junichi Fujii
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, 990-9585, Japan.
| |
Collapse
|
37
|
Involvement of JNK/FOXO1 pathway in apoptosis induced by severe hypoxia in porcine granulosa cells. Theriogenology 2020; 154:120-127. [PMID: 32562827 DOI: 10.1016/j.theriogenology.2020.05.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/09/2020] [Accepted: 05/12/2020] [Indexed: 12/21/2022]
Abstract
In ovaries, follicles undergo a periodic process of degeneration, namely atresia, during each stage of development. Granulosa cell (GC) apoptosis is believed as the hallmark of follicular atresia. The avascular environment within the granulosa compartment is supposed to cause hypoxic conditions. The effects of hypoxia on organs, tissues, cells can be either positive or negative, depending on the severity and context. The present study aimed to explore whether and how severe hypoxia under in vitro conditions functions in apoptosis of porcine GCs. The current results showed that the apoptosis in porcine GCs exposed to severe hypoxia (1% O2) was correlated with enhanced activation of c-Jun N-terminal kinase (JNK), nuclear accumulation of FOXO1, as well as elevated level of cleaved caspase-3 and decreased ratio of BCL-2/BAX. Further investigations revealed that severe hypoxia-mediated JNK activation was required for the apoptotic death of porcine GCs and the nuclear transport of FOXO1. Moreover, inhibition of FOXO1 reduced GCs apoptosis upon severe hypoxia exposure. Together, these findings suggested that severe hypoxia might act through JNK/FOXO1 axis to induce apoptosis in porcine GCs.
Collapse
|
38
|
Chen K, Guo N, Zhang R, Wei C, Guo R. CYP2E1 and miRNA‐378a‐3p contribute to acetaminophen‐ or tripterygium glycosides‐induced hepatotoxicity. Basic Clin Pharmacol Toxicol 2019; 126:153-165. [PMID: 31468699 DOI: 10.1111/bcpt.13313] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 08/21/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Keguang Chen
- Institute of Clinical Pharmacology Qilu Hospital of Shandong University Jinan China
| | - Nan Guo
- Institute of Clinical Pharmacology Qilu Hospital of Shandong University Jinan China
| | - Rui Zhang
- Institute of Clinical Pharmacology Qilu Hospital of Shandong University Jinan China
| | - Chunmin Wei
- Center for Drug Evaluation National Medical Products Administration Beijing China
| | - Ruichen Guo
- Institute of Clinical Pharmacology Qilu Hospital of Shandong University Jinan China
| |
Collapse
|
39
|
Xia T, Zhang B, Duan W, Li Y, Zhang J, Song J, Zheng Y, Wang M. Hepatoprotective efficacy of Shanxi aged vinegar extract against oxidative damage in vitro and in vivo. J Funct Foods 2019. [DOI: 10.1016/j.jff.2019.103448] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
40
|
Liu Y, Liao L, Chen Y, Han F. Effects of daphnetin on lipid metabolism, insulin resistance and oxidative stress in OA‑treated HepG2 cells. Mol Med Rep 2019; 19:4673-4684. [PMID: 30957185 PMCID: PMC6522799 DOI: 10.3892/mmr.2019.10139] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 03/27/2019] [Indexed: 01/07/2023] Open
Abstract
Non‑alcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease, and has high rates of morbidity and mortality worldwide. Daphnetin (DAP) possesses notable antioxidative, anti‑inflammatory and anticoagulant activities; DAP is an active ingredient extracted from Daphne Koreana Nakai. To investigate the effects and the underlying mechanism of DAP on NAFLD, we treated HepG2 cells with oleic acid (OA) and DAP simultaneously and non‑simultaneously. In the simultaneous treatment condition, HepG2 cells were co‑treated with 0.5 mM OA and DAP (5, 20, and 50 µM) for 24 h. In the non‑simultaneous treatment conditions, HepG2 cells were pretreated with 0.5 mM OA for 24 h, and then treated with DAP (5, 20 and 50 µM) for 24 h. Following the aforementioned treatments, the biochemical indexes associated with NAFLD were measured as follows: i) The intracellular contents of triglyceride (TG), reactive oxygen species (ROS) and fluorescent glucose 2‑[N‑(7‑nitrobenz‑2‑oxa‑1,3‑diazol‑4‑yl) amino]‑2‑deoxyglucose were analyzed with corresponding detection kits; and ii) the cellular expression levels of glycolipid metabolism‑ and oxidative stress‑related genes, including 5'AMP‑activated protein kinase (AMPK), sterol regulatory element‑binding protein‑1C (SREBP‑1C), patatin‑like phospholipase domain‑containing protein 3 (PNPLA3), peroxisome proliferator‑activated receptor α (PPARα), phosphoinositide 3‑kinase (PI3K), protein kinase B (AKT), nuclear factor‑like 2 (Nrf2), cytochrome P450 (CYP) 2E1 and CYP4A were determined by reverse transcription‑quantitative polymerase chain reaction and western blotting. The results revealed the potential mechanism underlying the effects of DAP on NAFLD in vitro: i) By increasing the phosphorylation of AMPK, DAP inhibited the expression of SREBP‑1C and PNPLA3, and induced that of PPARα. Lipid accumulation within hepatocytes was reduced; ii) by upregulating PI3K expression and pAKT/AKT levels, DAP may alleviate insulin resistance and promote hepatocellular glucose uptake; and iii) by upregulating the expression of Nrf2, DAP downregulated the expression of CYP2E1 and CYP4A, and the levels of reactive oxygen species in hepatocytes.
Collapse
Affiliation(s)
- Yayun Liu
- Hubei Province Key Laboratory of Biotechnology of Chinese Traditional Medicine, National and Local Joint Engineering Research Center of High-throughput Drug Screening Technology, Hubei University, Wuhan, Hubei 430062, P.R. China
| | - Lu Liao
- Hubei Province Key Laboratory of Biotechnology of Chinese Traditional Medicine, National and Local Joint Engineering Research Center of High-throughput Drug Screening Technology, Hubei University, Wuhan, Hubei 430062, P.R. China
| | - Yong Chen
- Hubei Province Key Laboratory of Biotechnology of Chinese Traditional Medicine, National and Local Joint Engineering Research Center of High-throughput Drug Screening Technology, Hubei University, Wuhan, Hubei 430062, P.R. China
| | - Fengmei Han
- Hubei Province Key Laboratory of Biotechnology of Chinese Traditional Medicine, National and Local Joint Engineering Research Center of High-throughput Drug Screening Technology, Hubei University, Wuhan, Hubei 430062, P.R. China
| |
Collapse
|
41
|
Li H, Liu Y, Li J, Liu Y, Dong L, Yin Y, Yu Y, Zhou J, Zhang L, Lu X, Chen Z, Zuo D. Mannan-binding lectin attenuates acetaminophen-induced hepatotoxicity by regulating CYP2E1 expression via ROS-dependent JNK/SP1 pathway. Eur J Immunol 2019; 49:564-575. [PMID: 30706943 DOI: 10.1002/eji.201847830] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 12/31/2018] [Accepted: 01/31/2019] [Indexed: 01/08/2023]
Abstract
Mannan-binding lectin (MBL) acts as a soluble pattern recognition molecule in the innate immune system, which is primarily produced by the liver. MBL deficiency occurs with high frequency in the population and is reported to be associated with susceptibility to several liver diseases. In the present study, we investigated the pathophysiological role of MBL in acetaminophen (APAP)-induced hepatotoxicity. After APAP treatment, MBL-deficient (MBL-/- ) mice had significantly higher mortality and aggravated hepatic necrosis as well as elevated serum lactate dehydrogenase and alanine aminotransferase levels compared to control mice. The enhanced hepatotoxicity in MBL-/- mice was associated with increased concentration of APAP toxic metabolisms. Furthermore, we demonstrated here that genetic ablation of MBL resulted in excessive reactive oxygen species (ROS) production and enhanced c-Jun N-terminal kinase (JNK) activation, leading to up-regulated specificity protein 1 (SP1) nuclear expression, thus promoted CYP2E1 hepatic expression and consequently exacerbated APAP-induced liver injury in mice. Importantly, we have validated that MBL protected against APAP toxicity in human HepaRG cells in vitro with the same mechanism. Our study revealed an unexpected function of MBL in drug metabolism, thus providing new insight into the drug-induced liver injury in patients with MBL deficiency.
Collapse
Affiliation(s)
- Huifang Li
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Department of Pathology, Anhui Chest Hospital, Hefei, China
| | - Yan Liu
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Junru Li
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Department of Rheumatology and Immunology, Puyang People's Hospital, Puyang, China
| | - Yunzhi Liu
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Lijun Dong
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Yue Yin
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yu Yu
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Jia Zhou
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Liyun Zhang
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xiao Lu
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Zhengliang Chen
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Proteomics, Southern Medical University, Guangzhou, China
| | - Daming Zuo
- Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Proteomics, Southern Medical University, Guangzhou, China
| |
Collapse
|
42
|
Nie X, Wang W, Wang Q, Zhu D, Song H. Intranasal erythropoietin ameliorates neurological function impairments and neural pathology in mice with chronic alcoholism by regulating autophagy‑related Nrf2 degradation. Mol Med Rep 2018; 19:1139-1149. [PMID: 30535439 PMCID: PMC6323205 DOI: 10.3892/mmr.2018.9706] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 11/01/2018] [Indexed: 12/22/2022] Open
Abstract
The neurological disorders and neural pathology brought about by chronic alcoholism are difficult to be reversed. Increasing evidence highlights the protective roles of erythropoietin (EPO) in neurodegenerative diseases and injuries of the central nervous system. In the present study, we investigated the therapeutic effects of EPO on the neurological function deficits and neural pathology caused by chronic alcoholism and the regulatory mechanisms. Using the canonical mouse model of chronic alcohol exposure designed to mimic the repeated cycles of heavy abuse typical of chronic alcoholism, it was found that EPO delivered via intranasal route effectively restored the alcohol-impaired motor cooperation in rotarod and beam walk tests, reversed alcoholic cognitive and emotional alterations in the novel location recognition task and open-filed test, and rescued alcohol-disrupted nervous conduction in the somatosensory-evoked potential (SSEP) test. Consistently, the intranasally administered EPO promoted the remyelination and synapse formation in chronic alcohol-affected neocortex and hippocampus as evidenced by immunofluorescence staining and transmission electron microscopy. Additionally, we discovered that the exogenous rhEPO, which entered the cerebrum through intranasal route, activated the erythropoietin receptor (EPOR) and the downstream ERKs and PI3K/AKT signaling, and suppressed autophagy-related degradation of nuclear factor, erythroid 2-like 2 (Nrf2). Furthermore, the intranasal EPO-exerted neuroprotection was almost abolished when the specific Nrf2 antagonist ATRA was administered intraperitoneally prior to intranasal EPO treatment. Collectively, our data demonstrated the repairing potential of EPO for the neurological disorders and neural pathology caused by chronic alcoholism, and identified the Nrf2 activity as the key mechanism mediating the protective effects of EPO.
Collapse
Affiliation(s)
- Xuedan Nie
- Department of Neurology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Wenbo Wang
- Intensive Care Unit, The Fifth Affiliated Hospital of Qiqihar Medical University (Daqing Longnan Hospital), Daqing, Heilongjiang 163453, P.R. China
| | - Qin Wang
- Department of Nephrology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Dan Zhu
- Department of Nephrology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Hongshan Song
- Department of Neurology, The Fifth Affiliated Hospital of Qiqihar Medical University (Daqing Longnan Hospital), Daqing, Heilongjiang 163453, P.R. China
| |
Collapse
|
43
|
Hepatoprotective Effect of Loquat Leaf Flavonoids in PM 2.5-Induced Non-Alcoholic Fatty Liver Disease via Regulation of IRs-1/Akt and CYP2E1/JNK Pathways. Int J Mol Sci 2018; 19:ijms19103005. [PMID: 30275422 PMCID: PMC6213634 DOI: 10.3390/ijms19103005] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/23/2018] [Accepted: 09/26/2018] [Indexed: 12/20/2022] Open
Abstract
Ambient air particulate matter (PM) represents a class of heterogeneous substances present in polluted air, which contains many harmful components. Exposure to ambient particulate matter in fine rages (PM2.5) is associated with non-alcoholic fatty liver disease (NAFLD). Loquat Leaf possesses pharmacological actions on NAFLD. As the main biological active ingredients, the potential therapeutic role of total flavonoids (TF) isolated from Loquat Leaf in PM2.5-induced NAFLD model remains unclear. The present study was designed to explore the hepatoprotective effect of TF in PM2.5-induced NAFLD mice with its related mechanisms of action. Mice were exposed to PM2.5 to induce NAFLD, and body weight, the ratio of liver to body weight, and blood lipids increased significantly compared with the control group. It was found that TF significantly reduced the above parameters in PM2.5-induced NAFLD mice. TF treatment alleviated oxidative stress by preventing the accumulation of oxidative product malondialdehyde (MDA) and by strengthening the anti-oxidative capacity of superoxide dismutase (SOD). TF was also found to reduce the alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activity in the PM2.5 group. In addition, TF repaired the PM2.5-induced decline of insulin receptor substrate-1 (IRs-1) and protein kinase B (Akt) phosphorylation. Meanwhile, the data showed TF suppressed the expression of cytochrome P450 2E1(CYP2E1) and the phosphorylation of c-jun N-terminal kinase (JNK) in PM2.5-induced NAFLD. Taken together, these findings show that TF alleviate PM2.5-induced NAFLD via regulation of IRs-1/Akt and CYP2E1/JNK pathways, which may have potential for further development as novel therapeutic agents for NAFLD.
Collapse
|
44
|
Wang DX, Pan YQ, Liu B, Dai L. Cav-1 promotes atherosclerosis by activating JNK-associated signaling. Biochem Biophys Res Commun 2018; 503:513-520. [PMID: 29746866 DOI: 10.1016/j.bbrc.2018.05.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 05/06/2018] [Indexed: 12/16/2022]
Abstract
The objective of the study is to calculate the role and underlying the molecular mechanisms of caveolin-1 (Cav-1) in atherosclerosis (AS). Cav-1 was mainly expressed in the endothelial cells of atherosclerotic lesions in both human patients and apolipoprotein E deficient (ApoE-/-) mice. Cav-1 deficiency (Cav-1-/-) attenuated high-fat diet (HFD)-induced atherosclerotic lesions in ApoE-/- mice, supported by the reduced aortic plaques. Cav-1-/- reduced the macrophage content and decreased the release of inflammation-related cytokines or chemokine in serum or abdominal aortas, accompanied with the inactivation of inhibitor κB kinase κ (IKKβ)/p65/IκBα signaling pathway. Also, the activity of mitogen-activated protein kinases 7/c-Jun-N-terminal kinase (MKK7/JNK) signaling was decreased by Cav-1-/-. In addition, oxidative stress induced by HFD in ApoE-/- mice was alleviated by Cav-1-/-. In response to HFD, Cav-1-/- markedly reduced triglyceride (TG), total cholesterol (TC), low-density lipoprotein-cholesterol (LDLC) and very low-density lipoprotein-cholesterol (VLDLC) in serum of HFD-fed ApoE-/- mice, whereas enhanced high-density lipoprotein-cholesterol (HDLC) contents. Consistent with these findings, haematoxylin and eosin (H&E) and Oil Red O staining showed fewer lipid droplets in the liver of Cav-1-deficient mice. Further, real time-quantitative PCR (RT-qPCR) analysis indicated that Cav-1-/- alleviated dyslipidemia both in liver and abdominal aortas of ApoE-/- mice fed with HFD. Cav-1 inhibition-induced attenuation of inflammatory response, oxidative stress and dyslipidemia were confirmed in vitro using mouse vascular smooth muscle cells (VSMCs) treated with ox-LDL. Surprisingly, the processes regulated by Cav-1-knockdown could be abolished through promoting JNK activation in ox-LDL-treated VSMCs. In conclusion, Cav-1 expression could promote HFD-induced AS in a JNK-dependent manner.
Collapse
Affiliation(s)
- Dong-Xia Wang
- The First Affiliated Hospital of Dalian Medical University, 222 zhongshan Road, Dalian 116011, China
| | - Yong-Quan Pan
- The Second Affiliated Hospital of Dalian Medical University, 467 zhongshan Road, Dalian 116011, China
| | - Bing Liu
- The Second Affiliated Hospital of Dalian Medical University, 467 zhongshan Road, Dalian 116011, China
| | - Li Dai
- The Second Affiliated Hospital of Dalian Medical University, 467 zhongshan Road, Dalian 116011, China.
| |
Collapse
|
45
|
Mishra M, Jiang H, Chawsheen HA, Gerard M, Toledano MB, Wei Q. Nrf2-activated expression of sulfiredoxin contributes to urethane-induced lung tumorigenesis. Cancer Lett 2018; 432:216-226. [PMID: 29906488 DOI: 10.1016/j.canlet.2018.06.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/05/2018] [Accepted: 06/07/2018] [Indexed: 12/15/2022]
Abstract
Lung cancer is the leading cause of cancer death worldwide. Cigarette smoking and exposure to chemical carcinogens are among the risk factors of lung tumorigenesis. In this study, we found that cigarette smoke condensate and urethane significantly stimulated the expression of sulfiredoxin (Srx) at the transcript and protein levels in cultured normal lung epithelial cells, and such stimulation was mediated through the activation of nuclear related factor 2 (Nrf2). To study the role of Srx in lung cancer development in vivo, mice with Srx wildtype, heterozygous or knockout genotype were subjected to the same protocol of urethane treatment to induce lung tumors. By comparing tumor multiplicity and volume between groups of mice with different genotype, we found that Srx knockout mice had a significantly lower number and smaller size of lung tumors. Mechanistically, we demonstrated that loss of Srx led to a decrease of tumor cell proliferation as well as an increase of tumor cell apoptosis. These data suggest that Srx may have an oncogenic role that contributes to the development of lung cancer in smokers or urethane-exposed human subjects.
Collapse
Affiliation(s)
- Murli Mishra
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, 40536, USA
| | - Hong Jiang
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, 40536, USA; Markey Cancer Center, University of Kentucky, Lexington, KY, 40536, USA
| | - Hedy A Chawsheen
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, 40536, USA
| | - Matthieu Gerard
- Epigenetic Regulation and Cancer Group, Institut de Biologie et de Technologies de Saclay (iBiTecS), CEA-Saclay, 91191, Gif-sur-Yvette, France
| | - Michel B Toledano
- Oxidative Stress and Cancer Group (LSOC), Institut de Biologie et de Technologies de Saclay (iBiTecS), CEA-Saclay, 91191, Gif-sur-Yvette, France
| | - Qiou Wei
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, 40536, USA; Markey Cancer Center, University of Kentucky, Lexington, KY, 40536, USA.
| |
Collapse
|
46
|
Koneru M, Sahu BD, Mir SM, Ravuri HG, Kuncha M, Mahesh Kumar J, Kilari EK, Sistla R. Capsaicin, the pungent principle of peppers, ameliorates alcohol-induced acute liver injury in mice via modulation of matrix metalloproteinases. Can J Physiol Pharmacol 2018; 96:419-427. [DOI: 10.1139/cjpp-2017-0473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Alcohol, the most common cause for hepatic injury, may further deteriorate the hepatic tissue when left unattended. Capsaicin, the pungent principle of chilli peppers, possesses antioxidant and anti-inflammatory properties and is a proven dietary antioxidant in various ailments. However, its role in alcohol-induced hepatic injury is unclear. In this study, we investigated the effects of capsaicin on the hepatic tissue of mice treated with alcohol. Acute liver injury was induced in mice by oral gavage of 5 doses of 10 mL/kg of 50% ethyl alcohol at an interval of 12 h. The tissue antioxidant levels along with the mitochondrial functional parameters and matrix metalloproteinase levels were evaluated in the hepatic tissues of mice following alcohol challenge. The results showed that alcohol intake significantly attenuated the hepatic antioxidant levels and mitochondrial function. These changes were accompanied by enhanced serum hepatic injury markers and matrix metalloproteinases. However, capsaicin treatment (10 and 20 mg/kg, oral) throughout the experimental period caused a drastic improvement in the hepatic tissue of the alcohol-treated mice, reflected by the normalization of hepatic enzyme and protein levels along with restored histological alterations. These results indicate that capsaicin, as a dietary intervention, may prevent alcohol-induced acute liver injury.
Collapse
Affiliation(s)
- Meghana Koneru
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Bidya Dhar Sahu
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Salma Mukhtar Mir
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Halley Gora Ravuri
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Madhusudana Kuncha
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Jerald Mahesh Kumar
- Animal House Facility, CSIR-Centre for Cellular and Molecular Biology, Hyderabad 500007, India
| | - Eswar Kumar Kilari
- Department of Pharmacology, A.U. College of Pharmaceutical Sciences, Andhra University, Visakhapatnam 530003, India
| | - Ramakrishna Sistla
- Medicinal Chemistry and Pharmacology Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| |
Collapse
|
47
|
Tomasi ML, Ramani K, Ryoo M, Cossu C, Floris A, Murray BJ, Iglesias-Ara A, Spissu Y, Mavila N. SUMOylation regulates cytochrome P450 2E1 expression and activity in alcoholic liver disease. FASEB J 2018; 32:3278-3288. [PMID: 29401608 DOI: 10.1096/fj.201701124r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Alcohol acts through numerous pathways leading to alcoholic liver disease (ALD). Cytochrome P450 (CYP2E1), an ethanol-inducible enzyme, metabolizes ethanol-producing toxic reactive oxygen species (ROS) and is regulated at the posttranslational level. Small ubiquitin-like modifier (SUMO)ylation is a posttranslational modification that involves the addition of SUMOs, which modulate protein stability, activity, and localization. We demonstrated that ubiquitin-conjugation enzyme 9, the SUMO-conjugating enzyme, is induced in the livers of an intragastric ethanol mouse model. Our aim is to examine whether SUMOylation could regulate ethanol-induced CYP2E1 expression in ALD and to elucidate the molecular mechanism(s). CYP2E1 and UBC9 expression in vitro and in vivo was detected by real-time PCR and immunoblotting/immunostaining. SUMOylation was assayed by mass spectrometry and coimmunoprecipitation. Ubc9 expression was induced in ethanol-fed mouse livers, and silencing inhibited ethanol-mediated CYP2E1 microsomal retention and enzymatic activity. CYP2E1 SUMOylation was found to be induced by ethanol in vitro and in vivo. Ubc9 silencing prevents ethanol-induced lipid accumulation and ROS production. UBC9 was highly expressed in human ALD livers. Finally, we found that lysine 410 is a key SUMOylated residue contributing to CYP2E1 protein stability and activity preventing CYP2E1 SUMOylation. Ethanol-mediated up-regulation of CYP2E1 via SUMOylation enhancing its protein stability and activity and may have important implications in ALD.-Tomasi, M. L., Ramani, K., Ryoo, M., Cossu, C., Floris, A., Murray, B. J., Iglesias-Ara, A., Spissu, Y., Mavila, N. SUMOylation regulates cytochrome P450 2E1 expression and activity in alcoholic liver disease.
Collapse
Affiliation(s)
- Maria Lauda Tomasi
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Komal Ramani
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Minjung Ryoo
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Carla Cossu
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy
| | - Andrea Floris
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Department of Medical Sciences, University of Cagliari, Cagliari, Italy
| | - Ben J Murray
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Ainhoa Iglesias-Ara
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Ylenia Spissu
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy
| | - Nirmala Mavila
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| |
Collapse
|
48
|
Baicalin attenuates diet induced nonalcoholic steatohepatitis by inhibiting inflammation and oxidative stress via suppressing JNK signaling pathways. Biomed Pharmacother 2017; 98:111-117. [PMID: 29247950 DOI: 10.1016/j.biopha.2017.12.026] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 12/02/2017] [Accepted: 12/05/2017] [Indexed: 02/08/2023] Open
Abstract
Nonalcoholic steatohepatitis may develop into hepatic cirrhosis. The therapeutic drugs for NASH are absent. Baicalin (BC) has hepatoprotective effect, while whether BC could prevent the development of NASH is unknown. This study aimed to investigate the effect of BC on the development of diet induced NASH and the possible mechanisms involved. Mice were fed with high fat and high cholesterol (HFC) diet to establish a NASH model, BC (0.5% w/w) was added into the diet to evaluate its effect on NASH. Mice fed an HFC diet developed NASH in 12 weeks. BC administration attenuated hepatic steatosis, inflammation and fibrosis induced by HFC diet. The NALFD activity score (NAS) was sharply decreased by BC. Mice serum ALT and AST were decreased in the BC group. BC decreased hepatic inflammatory cell infiltration, inflammatory genes (MCP-1, TNFα) and fibrosis genes (COL1, α-SMA, TGFβ) mRNA expression. BC has antioxidant function evidenced by upregulated hepatic GSH and SOD levels and downregulated MDA levels. BC restored some oxidative stress markers including 4-HNE, 8-OHdG in liver. Western blot analysis stated that BC suppressed pro-inflammatory COX-2 levels, pro-oxidative CYP2E1 levels and phosphorylation of JNK in mice liver. Collectively, BC can attenuate diet induced NASH and the mechanism in which possibly due to its anti-inflammatory and anti-oxidant effects via blockade of the activation of JNK.
Collapse
|
49
|
Ramadori P, Cubero FJ, Liedtke C, Trautwein C, Nevzorova YA. Alcohol and Hepatocellular Carcinoma: Adding Fuel to the Flame. Cancers (Basel) 2017; 9:cancers9100130. [PMID: 28946672 PMCID: PMC5664069 DOI: 10.3390/cancers9100130] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/15/2017] [Accepted: 09/19/2017] [Indexed: 02/06/2023] Open
Abstract
Primary tumors of the liver represent the fifth most common type of cancer in the world and the third leading cause of cancer-related death. Case-control studies from different countries report that chronic ethanol consumption is associated with an approximately 2-fold increased odds ratio for hepatocellular carcinoma (HCC). Despite the substantial epidemiologic data in humans demonstrating that chronic alcohol consumption is a major risk factor for HCC development, the pathways causing alcohol-induced liver cancer are poorly understood. In this overview, we summarize the epidemiological evidence for the association between alcohol and liver cancer, review the genetic, oncogenic, and epigenetic factors that drive HCC development synergistically with ethanol intake and discuss the essential molecular and metabolic pathways involved in alcohol-induced liver tumorigenesis.
Collapse
Affiliation(s)
- Pierluigi Ramadori
- Department of Internal Medicine III, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany.
| | - Francisco Javier Cubero
- Department of Immunology, Complutense University School of Medicine, Madrid 28040, Spain.
- 13 de Octubre Health Research Institute (imas12), Madrid 28041, Spain.
| | - Christian Liedtke
- Department of Internal Medicine III, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany.
| | - Christian Trautwein
- Department of Internal Medicine III, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany.
| | - Yulia A Nevzorova
- Department of Internal Medicine III, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany.
- Department of Animal Physiology II, Faculty of Biology, Complutense University, Madrid 28040, Spain.
| |
Collapse
|
50
|
The Contribution of Singlet Oxygen to Insulin Resistance. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:8765972. [PMID: 29081894 PMCID: PMC5610878 DOI: 10.1155/2017/8765972] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 08/07/2017] [Indexed: 12/21/2022]
Abstract
Insulin resistance contributes to the development of diabetes and cardiovascular dysfunctions. Recent studies showed that elevated singlet oxygen-mediated lipid peroxidation precedes and predicts diet-induced insulin resistance (IR), and neutrophils were suggested to be responsible for such singlet oxygen production. This review highlights literature suggesting that insulin-responsive cells such as endothelial cells, hepatocytes, adipocytes, and myocytes also produce singlet oxygen, which contributes to insulin resistance, for example, by generating bioactive aldehydes, inducing endoplasmic reticulum (ER) stress, and modifying mitochondrial DNA. In these cells, nutrient overload leads to the activation of Toll-like receptor 4 and other receptors, leading to the production of both peroxynitrite and hydrogen peroxide, which react to produce singlet oxygen. Cytochrome P450 2E1 and cytochrome c also contribute to singlet oxygen formation in the ER and mitochondria, respectively. Endothelial cell-derived singlet oxygen is suggested to mediate the formation of oxidized low-density lipoprotein which perpetuates IR, partly through neutrophil recruitment to adipose tissue. New singlet oxygen-involving pathways for the formation of IR-inducing bioactive aldehydes such as 4-hydroperoxy-(or hydroxy or oxo)-2-nonenal, malondialdehyde, and cholesterol secosterol A are proposed. Strategies against IR should target the singlet oxygen-producing pathways, singlet oxygen quenching, and singlet oxygen-induced cellular responses.
Collapse
|