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Shen X, Luo K, Yuan J, Gao J, Cui B, Yu Z, Lu Z. Hepatic DDAH1 mitigates hepatic steatosis and insulin resistance in obese mice: Involvement of reduced S100A11 expression. Acta Pharm Sin B 2023; 13:3352-3364. [PMID: 37655336 PMCID: PMC10465955 DOI: 10.1016/j.apsb.2023.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/16/2023] [Accepted: 04/03/2023] [Indexed: 09/02/2023] Open
Abstract
Dimethylarginine dimethylaminohydrolase 1 (DDAH1) is an important regulator of plasma asymmetric dimethylarginine (ADMA) levels, which are associated with insulin resistance in patients with nonalcoholic fatty liver disease (NAFLD). To elucidate the role of hepatic DDAH1 in the pathogenesis of NAFLD, we used hepatocyte-specific Ddah1-knockout mice (Ddah1HKO) to examine the progress of high-fat diet (HFD)-induced NAFLD. Compared to diet-matched flox/flox littermates (Ddah1f/f), Ddah1HKO mice exhibited higher serum ADMA levels. After HFD feeding for 16 weeks, Ddah1HKO mice developed more severe liver steatosis and worse insulin resistance than Ddah1f/f mice. On the contrary, overexpression of DDAH1 attenuated the NAFLD-like phenotype in HFD-fed mice and ob/ob mice. RNA-seq analysis showed that DDAH1 affects NF-κB signaling, lipid metabolic processes, and immune system processes in fatty livers. Furthermore, DDAH1 reduces S100 calcium-binding protein A11 (S100A11) possibly via NF-κB, JNK and oxidative stress-dependent manner in fatty livers. Knockdown of hepatic S100a11 by an AAV8-shS100a11 vector alleviated hepatic steatosis and insulin resistance in HFD-fed Ddah1HKO mice. In summary, our results suggested that the liver DDAH1/S100A11 axis has a marked effect on liver lipid metabolism in obese mice. Strategies to increase liver DDAH1 activity or decrease S100A11 expression could be a valuable approach for NAFLD therapy.
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Affiliation(s)
- Xiyue Shen
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Respiratory Medicine, Tongji University School of Medicine, Shanghai 200433, China
| | - Kai Luo
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Juntao Yuan
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Junling Gao
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bingqing Cui
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhuoran Yu
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhongbing Lu
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
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DDAH1 Protects against Acetaminophen-Induced Liver Hepatoxicity in Mice. Antioxidants (Basel) 2022; 11:antiox11050880. [PMID: 35624743 PMCID: PMC9137993 DOI: 10.3390/antiox11050880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/23/2022] [Accepted: 04/28/2022] [Indexed: 02/04/2023] Open
Abstract
In many developed countries, acetaminophen (APAP) overdose-induced acute liver injury is a significant therapeutic problem. Dimethylarginine dimethylaminohydrolase 1 (DDAH1) is a critical enzyme for asymmetric dimethylarginine (ADMA) metabolism. Growing evidence suggests that liver dysfunction is associated with increased plasma ADMA levels and reduced hepatic DDAH1 activity/expression. The purpose of this study was to investigate the involvement of DDAH1 in APAP-mediated hepatotoxicity using Ddah1-/- and DDAH1 transgenic mice. After APAP challenge, Ddah1-/- mice developed more severe liver injury than wild type (WT) mice, which was associated with a greater induction of fibrosis, oxidative stress, inflammation, cell apoptosis and phosphorylation of JNK. In contrast, overexpression of DDAH1 attenuated APAP-induced liver injury. RNA-seq analysis showed that DDAH1 affects xenobiotic metabolism and glutathione metabolism pathways in APAP-treated livers. Furthermore, we found that DDAH1 knockdown aggravated APAP-induced cell death, oxidative stress, phosphorylation of JNK and p65, upregulation of CYP2E1 and downregulation of GSTA1 in HepG2 cells. Collectively, our data suggested that DDAH1 has a marked protective effect against APAP-induced liver oxidative stress, inflammation and injury. Strategies to increase hepatic DDAH1 expression/activity may be novel approaches for drug-induced acute liver injury therapy.
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Berardo C, Di Pasqua LG, Cagna M, Richelmi P, Vairetti M, Ferrigno A. Nonalcoholic Fatty Liver Disease and Non-Alcoholic Steatohepatitis: Current Issues and Future Perspectives in Preclinical and Clinical Research. Int J Mol Sci 2020; 21:ijms21249646. [PMID: 33348908 PMCID: PMC7766139 DOI: 10.3390/ijms21249646] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 02/07/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a continuum of liver abnormalities often starting as simple steatosis and to potentially progress into nonalcoholic steatohepatitis (NASH), fibrosis, cirrhosis and hepatocellular carcinoma. Because of its increasing prevalence, NAFLD is becoming a major public health concern, in parallel with a worldwide increase in the recurrence rate of diabetes and metabolic syndrome. It has been estimated that NASH cirrhosis may surpass viral hepatitis C and become the leading indication for liver transplantation in the next decades. The broadening of the knowledge about NASH pathogenesis and progression is of pivotal importance for the discovery of new targeted and more effective therapies; aim of this review is to offer a comprehensive and updated overview on NAFLD and NASH pathogenesis, the most recommended treatments, drugs under development and new drug targets. The most relevant in vitro and in vivo models of NAFLD and NASH will be also reviewed, as well as the main molecular pathways involved in NAFLD and NASH development.
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Affiliation(s)
| | | | | | | | | | - Andrea Ferrigno
- Correspondence: (L.G.D.P.); (A.F.); Tel.: +39-0382-986-451 (L.G.D.P.)
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Yuan X, Diao J, Du A, Wen S, Zhou L, Pan Y. Circular RNA expression profiles and features in NAFLD mice: a study using RNA-seq data. J Transl Med 2020; 18:476. [PMID: 33308253 PMCID: PMC7731504 DOI: 10.1186/s12967-020-02637-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/27/2020] [Indexed: 12/22/2022] Open
Abstract
Background Nonalcoholic fatty liver disease (NAFLD) is primarily characterized by the hepatic cholesterol accumulation. Circular RNA (circRNA), one of noncoding RNA, involves in many liver diseases progression. However, no recent studies on circRNA expression profiles in NAFLD have been reported previously. Methods A NAFLD mouse model was constructed by providing high-fat diet (HFD) for 32 weeks. The circRNAs expression profile in normal mice and NAFLD mice were determined using high-output RNA sequencing method and bioinformatics methods, while the differentially expressed circRNAs were confirmed using Sanger sequencing and qRT-PCR. The circRNA-miRNA network was also predicted. The biological functions of circRNAs were annotated by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG). Results The results demonstrated the successful construction of NAFLD mice model by immunohistology and serology assay. In total, 93 dysregulated circRNAs were observed, including 57 upregulated circRNAs and 36 downregulated circRNAs, in the NAFLD group. The circRNA-miRNA network revealed the complex interaction between circRNAs and its potential miRNA targets in NAFLD. The characteristic of tissue-specific expression in circRNA was demonstrated. The differentially expressed circRNAs with important biological function were also annotated using GO and KEGG. Both DDAH1 and VAV3 genes were found to be associated with the NAFLD development. Conclusions Taken together, this study demonstrated the circRNAs expression profile and features in NAFLD, which may provide potential biological markers for the pathogenesis of NAFLD.
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Affiliation(s)
- Xinlu Yuan
- Department of Endocrinology and Metabolic Diseases, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China
| | - Jianjun Diao
- Department of Emergency, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China
| | - Anqing Du
- Department of Stomatology, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China
| | - Song Wen
- Department of Endocrinology and Metabolic Diseases, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China
| | - Ligang Zhou
- Department of Endocrinology and Metabolic Diseases, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China.
| | - Yangbin Pan
- Department of Nephrology, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gongwei Road, Pudong, Shanghai, 201399, China.
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Dragičević M, Košuta I, Kruezi E, Lovrenčić MV, Mrzljak A. Association of Asymmetric Dimethylarginine and Nitric Oxide with Cardiovascular Risk in Patients with End-Stage Liver Disease. MEDICINA (KAUNAS, LITHUANIA) 2020; 56:medicina56110622. [PMID: 33218157 PMCID: PMC7698953 DOI: 10.3390/medicina56110622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 11/11/2020] [Accepted: 11/16/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND OBJECTIVES Endothelial dysfunction has been proposed to be an underlying mechanism of the pronounced cardiovascular morbidity in end-stage liver disease (ESLD), but clinical evidence is still limited. In this study, we investigated the association of circulating levels of asymmetric dimethylarginine (ADMA) and nitric oxide (NO) with estimated cardiovascular risk in patients with ESLD awaiting liver transplantation. MATERIALS AND METHODS ADMA and NO levels were measured in the sera of 160 adult ESLD patients. The severity of hepatic dysfunction was assessed by the model for end-stage liver disease (MELD) score. The cardiovascular risk was estimated with the European Society of Cardiology Systematic Coronary Risk Estimation (SCORE) index, which was used to dichotomize patients in the subgroups depicting higher and lower cardiovascular risk. RESULTS Severe hepatic dysfunction (MELD ≥ 18) was present in 38% of the patients, and a higher cardiovascular risk was present in almost half of the patients (N = 74). ADMA and NO both significantly increased with the progression of liver disease and were independently associated with higher cardiovascular risk. Fasting glucose also independently predicted a higher cardiovascular risk, while HDL cholesterol and the absence of concomitant hepatocellular carcinoma were protective factors. CONCLUSIONS These results suggest a remarkable contribution of the deranged arginine/NO pathway to cardiovascular risk in patients with end-stage liver disease.
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Affiliation(s)
- Maro Dragičević
- Department of Cardiology, Merkur University Hospital, 10000 Zagreb, Croatia;
| | - Iva Košuta
- Department of Internal Medicine, University Hospital Centre, 10000 Zagreb, Croatia;
| | - Egon Kruezi
- Department of Gynaecology and Obstetrics, Sisters of Charity University Hospital Centre, 10000 Zagreb, Croatia;
| | - Marijana Vučić Lovrenčić
- Department of Clinical Chemistry and Laboratory Medicie, Merkur University Hospital, 10000 Zagreb, Croatia
- Correspondence: ; Tel.: +385-1-2353-861
| | - Anna Mrzljak
- Department of Gastroenterology, Merkur University Hospital, 10000 Zagreb, Croatia;
- School of Medicine, University of Zagreb, 10000 Zagreb, Croatia
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da Silva RP, Eudy BJ, Deminice R. One-Carbon Metabolism in Fatty Liver Disease and Fibrosis: One-Carbon to Rule Them All. J Nutr 2020; 150:994-1003. [PMID: 32119738 DOI: 10.1093/jn/nxaa032] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/14/2019] [Accepted: 01/30/2020] [Indexed: 02/07/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a term used to characterize a range of disease states that involve the accumulation of fat in the liver but are not associated with excessive alcohol consumption. NAFLD is a prevalent disease that can progress to organ damage like liver cirrhosis and hepatocellular carcinoma. Many animal models have demonstrated that one-carbon metabolism is strongly associated with NAFLD. Phosphatidylcholine is an important phospholipid that affects hepatic lipid homeostasis and de novo synthesis of this phospholipid is associated with NAFLD. However, one-carbon metabolism serves to support all cellular methylation reactions and catabolism of methionine, serine, glycine, choline, betaine, tryptophan, and histidine. Several different pathways within one-carbon metabolism that play important roles in regulating energy metabolism and immune function have received less attention in the study of fatty liver disease and fibrosis. This review examines what we have learned about hepatic lipid metabolism and liver damage from the study of one-carbon metabolism thus far and highlights unexplored opportunities for future research.
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Affiliation(s)
- Robin P da Silva
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Brandon J Eudy
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Rafael Deminice
- Department of Physical Education, State University of Londrina, Londrina, Paraná, Brazil
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Huang S, Xu Y, Peng WF, Cheng J, Li HH, Shen LS, Xia LL. Asymmetric dimethylarginine targets MAPK pathway to regulate insulin resistance in liver by activating inflammation factors. J Cell Biochem 2019; 120:7474-7481. [PMID: 30506883 DOI: 10.1002/jcb.28021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Accepted: 10/15/2018] [Indexed: 01/24/2023]
Abstract
Insulin resistance is associated with impaired glucose uptake and altered protein kinase B (Akt) signaling. Previous studies have suggested asymmetric dimethylarginine (ADMA) and inflammation are two distinguish factors that correlate with insulin resistance (IR). How ADMA and inflammation factors interact and synchronize in the regulation of IR in liver remain to be elucidated. In this study, we systematically investigated whether ADMA is involved in IR using primary hepatocytes, if yes, by via which molecular mechanism. Our results demonstrated that ADMA inhibits insulin sensitivity in a concentration-dependent manner by activating inflammation factors tumor necrosis factor (TNF)-α, interleukin (IL)-1, and IL-6 in primary hepatocytes. Further analysis revealed that mitogen-activated protein kinase (MAPK) signaling pathway act downstream of ADMA and inflammation factors, and inhibition of MAPK pathway rescued the IR. Furthermore, metformin effects has been found which could reverse ADMA-induced IR by suppressing MAPK signaling pathway. To our knowledge, we, for the first time, unveiled the complicated regulatory network and interactions among ADMA, inflammation, and MAPK signaling pathway, which advanced current research on the development and regulation of IR in liver. This study also certainly provided novel insights on comprehensive diagonistics roles of ADMA as a potential biomarker.
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Affiliation(s)
- Shan Huang
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yong Xu
- Department of Nephrology, Huai'an Second People's Hospital, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, China
| | - Wen-Fang Peng
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jie Cheng
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hui-Hua Li
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li-Sha Shen
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li-Li Xia
- Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Sorrenti V, Di Giacomo C, Acquaviva R, Cosenza J, Carota G, Galvano F. Blond and blood juice supplementation in high fat diet fed mice: effect on antioxidant status and DDAH/ADMA pathway. RSC Adv 2019; 9:11406-11412. [PMID: 35520248 PMCID: PMC9063282 DOI: 10.1039/c9ra00669a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 04/05/2019] [Indexed: 12/27/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is the most common liver disease spread throughout the world. The most frequent causes of death in NAFLD patients are due both to liver and cardiovascular damage. Several pathways, including the dimethylarginine dimethylaminohydrolase (DDAH)/asymmetric dimethylarginine (ADMA) pathway, are involved in the pathogenesis of NAFLD. It has been reported that ADMA plasmatic levels are increased in patients with hepatic dysfunction such as NAFLD. Although many studies demonstrated that some foods are effective in the treatment of NAFLD, few studies have evaluated their effects with respect to the prevention of the disease. It has been reported that sweet orange juice (OJ) consumption may be associated with potential health benefits. However, some varieties of sweet orange are more effective than others. The aim of the present paper was to investigate the effect of blond and blood sweet orange juice in prevention of NAFLD by evaluating its ability to improve liver steatosis in mice with diet-induced obesity, reducing oxidative stress and affecting the DDAH/ADMA pathway. Results obtained in our experimental conditions evidenced that blood orange juice rather than blond orange juice was more effective. Blood orange juice or blond orange juice enriched in anthocyanins may represent a promising dietary option for the prevention of fatty liver disease. Non-alcoholic fatty liver disease (NAFLD) is the most common liver disease spread throughout the world.![]()
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Affiliation(s)
- V. Sorrenti
- Department of Drug Sciences
- Section of Biochemistry
- University of Catania
- Catania
- Italy
| | - C. Di Giacomo
- Department of Drug Sciences
- Section of Biochemistry
- University of Catania
- Catania
- Italy
| | - R. Acquaviva
- Department of Drug Sciences
- Section of Biochemistry
- University of Catania
- Catania
- Italy
| | - J. Cosenza
- Department of Drug Sciences
- Section of Biochemistry
- University of Catania
- Catania
- Italy
| | - G. Carota
- Department of Drug Sciences
- Section of Biochemistry
- University of Catania
- Catania
- Italy
| | - F. Galvano
- Department of Biomedical and Biotechnological Sciences
- University of Catania
- Catania
- Italy
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Abstract
Nonalcoholic fatty liver disease is the most common cause of chronic liver disease in North America and is growing as a cause of chronic liver disease in many other parts of the world as well. It has 2 principal clinical-pathologic phenotypes: (1) nonalcoholic fatty liver and (2) nonalcoholic steatohepatitis. The development of both phenotypes is tightly linked to excess body weight and insulin resistance. This review discusses the emerging tools for the analysis of the microbiome, their limitations, and the existing literature with respect to the intestinal microbiome and their role in nonalcoholic fatty liver.
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Relationship between immune parameters and non-alcoholic fatty liver disease in obese children. Indian Pediatr 2017; 54:825-829. [DOI: 10.1007/s13312-017-1143-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Mohamed AA, Sabry S, Abdallah AM, Elazeem NAA, Refaey D, Algebaly HAF, Fath GAE, Omar H. Circulating adipokines in children with nonalcoholic fatty liver disease: possible noninvasive diagnostic markers. Ann Gastroenterol 2017; 30:457-463. [PMID: 28655985 PMCID: PMC5480001 DOI: 10.20524/aog.2017.0148] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 03/27/2017] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The growing obesity pandemic is the leading cause for increasing prevalence of nonalcoholic fatty liver disease (NAFLD) in children. Histopathological evaluation of the liver remains the gold standard for NAFLD diagnosis, but it is an invasive procedure with a low but real risk of morbidity and mortality. The current study evaluated circulating chemerin and adiponectin as possible noninvasive diagnostic markers for NAFLD in obese non-diabetic children. METHODS A prospective case-control study was conducted, which included 101 obese children with biopsy-proven NAFLD and 57 age- and sex-matched controls. The overall mean age of the children was 10.08±3.12 years. All underwent a full clinical assessment, routine laboratory investigation, and abdominal ultrasound. Homeostatic model assessment-insulin resistance was calculated and circulating chemerin and adiponectin were evaluated using ELISA. RESULTS Elevated serum chemerin and decreased serum adiponectin were significantly associated with an increased likelihood of exhibiting NAFLD. Receiver operator characteristic curve analysis for differentiation of NAFLD patients from those in the control group demonstrated that chemerin, at a cutoff value of 186.7 ng/mL, yielded a sensitivity and specificity of 56.44% and 87.72% respectively (P<0.001), whereas adiponectin, at a cutoff value of 2.4 µg/mL, had a sensitivity and specificity of 74.26% and 3.51% respectively (P<0.001). Furthermore, body mass index, aspartate transaminase, alanine transaminase, triglycerides, and gamma-glutamyl transferase had significant positive correlations with chemerin and significant negative correlations with adiponectin (P≤0.001). CONCLUSION Circulating chemerin and adiponectin could serve as simple noninvasive diagnostic markers for NAFLD in non-diabetic obese children.
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Affiliation(s)
- Amal Ahmed Mohamed
- Department of Biochemistry, National Hepatology and Tropical Medicine Institute, Egypt (Amal Ahmed Mohmmed)
| | - Said Sabry
- Clinical Pathology, Damanhur National Medical Institute, Egypt (Said Sabry)
| | - Asmaa Mahmoud Abdallah
- Department of Clinical Nutrition, Faculty of Applied Medical Science, King Abdul-Aziz University, Jeddah, Kingdom of Saudi Arabia (Asmaa Mahmoud Abdallah)
| | - Naglaa Adly Abd Elazeem
- Medical Biochemistry Department, Faculty of Medicine, Beni Suef University (Naglaa Adly Abd Elazeem)
| | - Doaa Refaey
- Pediatric Department, Faculty of Medicine, Benha University, Egypt (Doaa Refaey)
| | | | - Gamal Abo El Fath
- Pediatric Department, Genetic Unit, Faculty of Medicine, Ain Shams University (Gamal Abo El Fath)
| | - Heba Omar
- Endemic Medicine and Hepatology Department, Faculty of Medicine, Cairo University (Heba Omar), Egypt
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Li T, Feng R, Zhao C, Wang Y, Wang J, Liu S, Cao J, Wang H, Wang T, Guo Y, Lu Z. Dimethylarginine Dimethylaminohydrolase 1 Protects Against High-Fat Diet-Induced Hepatic Steatosis and Insulin Resistance in Mice. Antioxid Redox Signal 2017; 26:598-609. [PMID: 27565538 DOI: 10.1089/ars.2016.6742] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
AIMS High plasma concentrations of asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor, are associated with hepatic dysfunction in patients with nonalcoholic fatty liver disease (NAFLD). However, it is unknown whether ADMA is involved in the pathogenesis of NAFLD. Dimethylarginine dimethylaminohydrolase 1 (DDAH1) is an enzyme that degrades ADMA. In this study, we used Ddah1-/- mice to investigate the effects of the ADMA/DDAH1 pathway on high-fat diet (HFD)-induced hepatic steatosis. RESULTS After HFD feeding for 20 weeks, Ddah1-/- mice were more obese and had developed more severe hepatic steatosis and worse insulin resistance compared with wild-type (WT) mice. In the livers of HFD-fed mice, loss of DDAH1 resulted in higher levels of lipogenic genes, lower expression of β-oxidation genes, and greater induction of oxidative stress, endoplasmic reticulum stress, and inflammation than in the WT livers. Furthermore, ADMA treatment in HepG2 cells led to oxidative stress and steatosis, whereas overexpression of DDAH1 attenuated palmitic acid-induced steatosis, oxidative stress, and inflammation. Innovation and Conclusion: Our results provide the first direct evidence that the ADMA/DDAH1 pathway has a marked effect on hepatic lipogenesis and steatosis induced by HFD feeding. Our findings suggest that strategies to increase DDAH1 activity in hepatocytes may provide a novel approach to attenuate NAFLD development. Antioxid. Redox Signal. 26, 598-609.
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Affiliation(s)
- Tianhe Li
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Run Feng
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Chenyang Zhao
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Yue Wang
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Jian Wang
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Shasha Liu
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Jianwei Cao
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Hongyun Wang
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Ting Wang
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Yuting Guo
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
| | - Zhongbing Lu
- College of Life Science, University of Chinese Academy of Sciences , Beijing, China
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