Carboxylesterase 2 prevents liver steatosis by modulating lipolysis, endoplasmic reticulum stress, and lipogenesis and is regulated by hepatocyte nuclear factor 4 alpha in mice.
*Lipid Metabolism; Adiposity; Animals; Carboxylesterase/*metabolism; Carboxylic Ester Hydrolases/genetics/*metabolism; Diabetes Mellitus; Diet; Endoplasmic Reticulum Stress; Energy Metabolism; Experimental/enzymology; Gene Knockdown Techniques; Glucose Tolerance Test; Glucose/metabolism; Hepatocyte Nuclear Factor 4/*metabolism; High-Fat/adverse effects; Homeostasis; Humans; Inbred C57BL; Lipogenesis; Lipolysis; Liver/enzymology; Male; Mice; Non-alcoholic Fatty Liver Disease/*etiology/metabolism; Obesity/enzymology/etiology; Sterol Regulatory Element Binding Protein 1/metabolism
UNLABELLED: Nonalcoholic fatty liver disease (NAFLD) is a common liver disease that ranges from simple steatosis to nonalcoholic steatohepatitis (NASH). So far, the underlying mechanism remains poorly understood. Here, we show that hepatic carboxylesterase 2 (CES2) is markedly reduced in NASH patients, diabetic db/db mice, and high-fat diet (HFD)-fed mice. Restoration of hepatic CES2 expression in db/db or HFD-fed mice markedly ameliorates liver steatosis and insulin resistance. In contrast, knockdown of hepatic CES2 causes liver steatosis and damage in chow- or Western diet-fed C57BL/6 mice. Mechanistically, we demonstrate that CES2 has triglyceride hydrolase activity. As a result, gain of hepatic CES2 function increases fatty acid oxidation and inhibits lipogenesis, whereas loss of hepatic CES2 stimulates lipogenesis by inducing endoplasmic reticulum stress. We further show that loss of hepatic CES2 stimulates lipogenesis in a sterol regulatory element-binding protein 1 (SREBP-1)-dependent manner. Finally, we show that hepatocyte nuclear factor 4 alpha (HNF-4alpha) plays a key role in controlling hepatic CES2 expression in diabetes, obesity, or NASH. CONCLUSION: CES2 plays a protective role in development of NAFLD. Targeting the
Li Yuanyuan; Zalzala Munaf; Jadhav Kavita; Xu Yang; Kasumov Takhar; Yin Liya; Zhang Yanqiao
Hepatology (Baltimore, Md.)
2016
2016-06
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1002/hep.28472" target="_blank" rel="noreferrer noopener">10.1002/hep.28472</a>
Hepatocyte nuclear factor 4α prevents the steatosis-to-NASH progression by regulating p53 and bile acid signaling.
steatohepatitis; apoptosis; bile acid; HNF4α; lipolysis; P53
Hepatocyte nuclear factor 4α (HNF4α) is highly enriched in the liver, but its role in the progression of liver steatosis (NAFL) to non-alcoholic steatohepatitis (NASH) has not been elucidated. In this study, we investigated the effect of gain or loss of hepatocyte HNF4α function on the development and progression of non-alcoholic fatty liver disease (NAFLD) in mice. Over-expression of human HNF4α protected against high fat/cholesterol/fructose (HFCF) diet-induced steatohepatitis whereas loss of hepatocyte Hnf4α had opposite effects. HNF4α prevented hepatic triglyceride accumulation by promoting hepatic triglyceride lipolysis, fatty acid oxidation and VLDL secretion. Furthermore, HNF4α suppressed the progression of NAFL to NASH. Over-expression of human HNF4α inhibited HFCF diet-induced steatohepatitis in control mice but not in hepatocyte-specific p53(-/-) mice. In HFCF diet-fed mice lacking hepatic Hnf4α, recapitulation of hepatic expression of HNF4α targets cholesterol 7α-hydroxylase and sterol 12α-hydroxylase normalized hepatic triglyceride levels and attenuated steatohepatitis. CONCLUSIONS: The current study indicates that hepatocyte HNF4α protects against diet-induced development and progression of NAFLD by coordinating the regulation of lipolytic, p53 and bile acid signaling pathways. Targeting hepatic HNF4α may be useful for treatment of NASH.
Xu Y;Zhu Y;Hu S;Xu Y;Stroup D;Pan X;Bawa FC;Chen S;Gopoju R;Yin Liya;Zhang Y
Hepatology
2020
2020-10-23
journalArticle
<a href="http://doi.org/10.1002/hep.31604" target="_blank" rel="noreferrer noopener">10.1002/hep.31604</a>
Hepatocyte-specific expression of human carboxylesterase 2 attenuates non-alcoholic steatohepatitis in mice.
CES2; Fatty acid oxidation; Lipolysis; Lipotoxicity; Steatohepatitis
Human carboxylesterase 2 (CES2) has triacylglycerol hydrolase (TGH) activities and plays an important role in lipolysis. In this study, we aim to determine the role of human CES2 in the progression or reversal of steatohepatitis in diet-induced or genetically obese mice. High-fat/high-cholesterol/high-fructose (HFCF) diet-fed C57BL/6 mice or db/db mice were i.v. injected with an adeno-associated virus expressing human CES2 under the control of an albumin promoter. Human CES2 protected against HFCF diet-induced non-alcoholic fatty liver disease (NAFLD) in C57BL/6J mice and reversed steatohepatitis in db/db mice. Human CES2 also improved glucose tolerance and insulin sensitivity. Mechanistically, human CES2 reduced hepatic triglyceride and free fatty acid levels by inducing lipolysis and fatty acid oxidation and inhibiting lipogenesis via suppression of sterol regulatory element-binding protein 1. Furthermore, human CES2 overexpression improved mitochondrial respiration and glycolytic function, and inhibited gluconeogenesis, lipid peroxidation, apoptosis and inflammation. Our data suggest that hepatocyte-specific expression of human CES2 prevents and reverses steatohepatitis. Targeting hepatic CES2 may be an attractive strategy for treatment of NAFLD.
Xu Y; Pan X; Hu S; Zhu Y; Cassim BF; Li Y; Yin L; Zhang Y
American Journal of Physiology-Gastrointestinal and Liver Physiology
2020
2020-12-16
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
journalArticle
<a href="http://doi.org/10.1152/ajpgi.00315.2020" target="_blank" rel="noreferrer noopener">10.1152/ajpgi.00315.2020</a>
Hepatocyte-specific expression of human carboxylesterase 2 attenuates nonalcoholic steatohepatitis in mice.
steatohepatitis; LABORATORY mice; FATTY liver; lipotoxicity; CES2; fatty acid oxidation; lipolysis; FATTY acid oxidation; INSULIN sensitivity; STEROL regulatory element-binding proteins
Human carboxylesterase 2 (CES2) has triacylglycerol hydrolase (TGH) activities and plays an important role in lipolysis. In this study, we aim to determine the role of human CES2 in the progression or reversal of steatohepatitis in diet-induced or genetically obese mice. High-fat/high-cholesterol/high-fructose (HFCF) diet-fed C57BL/6 mice or db/db mice were intravenously injected with an adeno-associated virus expressing human CES2 under the control of an albumin promoter. Human CES2 protected against HFCF diet-induced nonalcoholic fatty liver disease (NAFLD) in C57BL/6J mice and reversed steatohepatitis in db/db mice. Human CES2 also improved glucose tolerance and insulin sensitivity. Mechanistically, human CES2 reduced hepatic triglyceride (T) and free fatty acid (FFA) levels by inducing lipolysis and fatty acid oxidation and inhibiting lipogenesis via suppression of sterol regulatory element-binding protein 1. Furthermore, human CES2 overexpression improved mitochondrial respiration and glycolytic function, and inhibited gluconeogenesis, lipid peroxidation, apoptosis, and inflammation. Our data suggest that hepatocyte-specific expression of human CES2 prevents and reverses steatohepatitis. Targeting hepatic CES2 may be an attractive strategy for treatment of NAFLD. NEW & NOTEWORTHY Human CES2 attenuates high-fat/cholesterol/fructose diet-induced steatohepatitis and reverses steatohepatitis in db/db mice. Mechanistically, human CES2 induces lipolysis, fatty acid and glucose oxidation, and inhibits hepatic glucose production, inflammation, lipid oxidation, and apoptosis. Our data suggest that human CES2 may be targeted for treatment of non-alcoholic steatohepatitis (NASH). [ABSTRACT FROM AUTHOR]
Xu Y;Pan X; Shuwei H;Zhu Y; Bawa FC;Li Y; Yin L; Zhang Y
American Journal Of Physiology: Gastrointestinal & Liver Physiology
2021
2021-02
journalArticle
<a href="http://doi.org/10.1152/ajpgi.00315.2020" target="_blank" rel="noreferrer noopener">10.1152/ajpgi.00315.2020</a>
Hepatocyte-specific expression of human carboxylesterase 2 attenuates nonalcoholic steatohepatitis in mice.
Human carboxylesterase 2 (CES2) has triacylglycerol hydrolase (TGH) activities and plays an important role in lipolysis. In this study, we aim to determine the role of human CES2 in the progression or reversal of steatohepatitis in diet-induced or genetically obese mice. High-fat/high-cholesterol/high-fructose (HFCF) diet-fed C57BL/6 mice or db/db mice were intravenously injected with an adeno-associated virus expressing human CES2 under the control of an albumin promoter. Human CES2 protected against HFCF diet-induced nonalcoholic fatty liver disease (NAFLD) in C57BL/6J mice and reversed steatohepatitis in db/db mice. Human CES2 also improved glucose tolerance and insulin sensitivity. Mechanistically, human CES2 reduced hepatic triglyceride (T) and free fatty acid (FFA) levels by inducing lipolysis and fatty acid oxidation and inhibiting lipogenesis via suppression of sterol regulatory element-binding protein 1. Furthermore, human CES2 overexpression improved mitochondrial respiration and glycolytic function, and inhibited gluconeogenesis, lipid peroxidation, apoptosis, and inflammation. Our data suggest that hepatocyte-specific expression of human CES2 prevents and reverses steatohepatitis. Targeting hepatic CES2 may be an attractive strategy for treatment of NAFLD.
Xu Y;Pan X; Shuwei H;Zhu Y; Bawa FC;Li Y; Yin L; Zhang Y
American Journal Of Physiology: Gastrointestinal & Liver Physiology
2021
2021-02-01
Copyright © 2021 the American Physiological Society
Journal Article
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