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The association between the pathogenesis and natural course of nonalcoholic fatty liver disease (NAFLD) and skeletal muscle dysfunction is increasingly recognized. These obesity-associated disorders originate primarily from sustained caloric excess, gradually disrupting cellular and molecular mechanisms of the adipose–muscle–liver axis resulting in end-stage tissue injury exemplified by cirrhosis and sarcopenia. These major clinical phenotypes develop through complex organ–tissue interactions from the earliest stages of NAFLD. While the role of adipose tissue expansion and remodeling is well established in the development of NAFLD, less is known about the specific interplay between skeletal muscle and the liver in this process. Here, the relationship between skeletal muscle and liver in various stages of NAFLD progression is reviewed. Current knowledge of the pathophysiology is summarized with the goal of better understanding the natural history, risk stratification, and management of NAFLD.  相似文献   

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The role of adipose tissue insulin resistance in the pathogenesis of nonalcoholic fatty liver disease (NAFLD) remains unclear. To evaluate this, we measured in 207 patients with NAFLD (age = 51 ± 1, body mass index = 34.1 ± 0.3 kg/m(2) ) and 22 controls without NAFLD (no NAFLD) adipose tissue insulin resistance by means of a validated index (Adipo-IR(i) = plasma free fatty acids [FFA] x insulin [FPI] concentration) and as the suppression of plasma FFA during an oral glucose tolerance test and by a low-dose insulin infusion. We also explored the relationship between adipose tissue insulin resistance with metabolic and histological parameters by dividing them based on quartiles of adipose tissue insulin resistance (Adipo-IR(i) quartiles: Q1 = more sensitive; Q4 = more insulin resistant). Hepatic insulin resistance, measured as an index derived from endogenous glucose production x FPI (HIRi), and muscle insulin sensitivity, were assessed during a euglycemic insulin clamp with 3-[(3) H] glucose. Liver fat was measured by magnetic resonance imaging and spectroscopy, and a liver biopsy was performed to assess liver histology. Compared to patients without steatosis, patients with NAFLD were insulin resistant at the level of adipose tissue, liver, and skeletal muscle and had higher plasma aspartate aminotransferase and alanine aminotransferase, triglycerides, and lower high-density lipoprotein cholesterol and adiponectin levels (all P < 0.01). Metabolic parameters, hepatic insulin resistance, and liver fibrosis (but not necroinflammation) deteriorated as quartiles of adipose tissue insulin resistance worsened (all P < 0.01). CONCLUSION: Adipose tissue insulin resistance plays a key role in the development of metabolic and histological abnormalities of obese patients with NAFLD. Treatment strategies targeting adipose tissue insulin resistance (e.g., weight loss and thiazolidinediones) may be of value in this population.  相似文献   

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目的观察比较艾塞那肽和甘精胰岛素治疗对糖尿病大鼠脂肪细胞脂代谢的影响。方法7~8周龄雄性sD大鼠,体重180~200g,按随机数字表法分为2组(对照组8只,高脂组30只):对照组仅予普通饮食,高脂组予高脂喂养5周,联合小剂量链脲佐菌素(STZ)诱导糖尿病SD大鼠模型,3d后将成模大鼠随机分为3组进行不同干预:对照组和糖尿病组给予生理盐水,另外2组分别予艾塞那肽或甘精胰岛素干预4周。通过Westernblotting和实时定量聚合酶链式反应检测大鼠附睾周围脂肪组织中脂肪细胞脂质合成酶如磷酸烯醇式丙酮酸羧激酶(PEPCK)、脂肪酸合成酶(FAS)、乙酰辅酶A羧化酶-1(ACC-1)蛋白及基因表达,以及脂质水解相关酶如脂肪组织甘油三酯脂酶(ATGL)、色素上皮衍生因子(PEDF)基因表达。多组定量资料间比较采用方差分析,两两比较采用最小差异显著性分析。结果与对照组比较,糖尿病大鼠脂肪细胞脂质合成酶PEPCK和FAS基因及蛋白表达降低,ACC-1基因水平降低,脂质水解相关蛋白ATGL和PEDF基因表达升高(均P〈0.05)。艾塞那肽及甘精胰岛素治疗后,PEPCK、FAS基因及蛋白水平升高,ACC-1基因表达增加,ATGL、PEDF基因表达降低(均P〈0.05)。与甘精胰岛素组比较,艾塞那肽组PEPCK、FAS基因[艾塞那肽与甘精胰岛素:PEPCKmRNA(1.68±0.45)VS(1.15±0.24);FASmRNA(7.12±0.13)vs(1.18±0.16)]及蛋白[PEPCK(1.11±0.08)vs(0.87±0.08);FAS(1.95±0.10)VS(0.99±0.08)]水平明显升高(t=2.525、69.374、5.312、18.670,均P〈0.05)。结论艾塞那肽可促进脂肪组织甘油三酯合成、减少脂质分解,其作用强于甘精胰岛素。  相似文献   

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AIM:To explore associations between nonalcoholic fatty liver disease(NAFLD)and benign gastrointestinal and pancreato-biliary disorders.METHODS:Patient demographics,diagnoses,and hospital outcomes from the 2010 Nationwide Inpatient Sample were analyzed.Chronic liver diseases were identified using International Classification of Diseases,the 9thRevision,Clinical Modification codes.Patients with NAFLD were compared to those with other chronic liver diseases for the endpoints of total hospital charges,disease severity,and hospital mortality.Multivariable stepwise logistic regression analyses to assess for the independent association of demographic,comorbidity,and diagnosis variables with the event of NAFLD(vs other chronic liver diseases)were also performed.RESULTS:Of 7800441 discharge records,32347(0.4%)and 271049(3.5%)included diagnoses of NAFLD and other chronic liver diseases,respectively.NAFLD patients were younger(average 52.3 years vs55.3 years),more often female(58.8%vs 41.6%),less often black(9.6%vs 18.6%),and were from higher income areas(23.7%vs 17.7%)compared to counterparts with other chronic liver diseases(all P<0.0001).Diabetes mellitus(43.4%vs 28.9%),hypertension(56.9%vs 47.6%),morbid obesity(36.9%vs 8.0%),dyslipidemia(37.9%vs 15.6%),and the metabolic syndrome(28.75%vs 8.8%)were all more common among NAFLD patients(all P<0.0001).The average total hospital charge($39607 vs$51665),disease severity scores,and intra-hospital mortality(0.9%vs6.0%)were lower among NALFD patients compared to those with other chronic liver diseases(all P<0.0001).Compared with other chronic liver diseases,NAFLD was significantly associated with diverticular disorders[OR=4.26(3.89-4.67)],inflammatory bowel diseases[OR=3.64(3.10-4.28)],gallstone related diseases[OR=3.59(3.40-3.79)],and benign pancreatitis[OR=2.95(2.79-3.12)]on multivariable logistic regression(all P<0.0001)when the latter disorders were the principal diagnoses on hospital discharge.Similar relationships were observed when the latter disorders were a  相似文献   

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AIM: To investigate the association of PNPLA3 polymorphisms with concurrent chronic hepatitis B (CHB) and nonalcoholic fatty liver disease (NAFLD).METHODS: A cohort of Han patients with biopsy-proven CHB, with or without NAFLD (CHB group, n = 51; CHB + NAFLD group, n = 57), and normal controls (normal group, n = 47) were recruited from Northern (Tianjin), Central (Shanghai), and Southern (Zhangzhou) China. Their PNPLA3 polymorphisms were genotyped by gene sequencing. The association between PNPLA3 polymorphisms and susceptibility to NAFLD, and clinical characteristics of NAFLD were evaluated on the basis of physical indices, liver function tests, glycolipid metabolism, and histopathologic scoring. The association of PNPLA3 polymorphisms and hepatitis B virus (HBV) load was determined by the serum level of HBV DNA.RESULTS: After adjusting for age, sex, and body mass index, we found that four linked single nucleotide polymorphisms (SNPs) of PNPLA3, including the rs738409 G allele (CHB + NAFLD group vs CHB group: odds ratio [OR] = 2.77, 95% confidence interval [CI]: 1.18-6.54; P = 0.02), rs3747206 T allele (CHB + NAFLD group vs CHB group: OR = 2.77, 95%CI: 1.18-6.54; P = 0.02), rs4823173 A allele (CHB + NAFLD group vs CHB group: OR = 2.73, 95%CI: 1.16-6.44; P = 0.02), and rs2072906 G allele (CHB + NAFLD group vs CHB group: OR = 3.05, 95%CI: 1.28-7.26; P = 0.01), conferred high risk to NAFLD in CHB patients. In patients with both CHB and NAFLD, these genotypes of PNPLA3 polymorphisms were associated with increased susceptibility to nonalcoholic steatohepatitis (NASH) (NAFLD activity score ≥ 3; P = 0.01-0.03) and liver fibrosis (> 1 Metavir grading; P = 0.01-0.04). As compared to those with C/C and C/G at rs738409, C/C and C/T at rs3747206, G/G and G/A at rs4823173, and A/A and A/G at rs2072906, patients in the CHB + NAFLD group with G/G at rs738409, T/T at rs3747206, A/A at rs4823173, and G/G at rs2072906 showed significantly lower serum levels of HBV DNA (P < 0.01-0.05).CONCLUSION: Four linked SNPs of PNPLA3 (rs738409, rs3747206, rs4823173, and rs2072906) are correlated with susceptibility to NAFLD, NASH, liver fibrosis, and HBV dynamics in CHB patients.  相似文献   

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目的 观察艾塞那肽对T2DM合并非酒精性脂肪性肝病(NAFLD)患者血糖、体重和肝酶学指标的治疗效果. 方法 T2DM合并NAFLD患者117例,随机分为艾塞那肽组和二甲双胍组,治疗12周,观察体重、血糖、血脂、胰岛素抵抗指数(HOMA-IR)、肝酶学指标、脂联素(APN)及高敏C反应蛋白(hsC-RP)的变化. 结果 与二甲双胍组相比,艾塞那肽组体重[(76.09±9.85)vs(77.22±10.15)kg]、WHR[(0.94±0.05)vs(0.96±0.04)]、谷丙转氨酶[(39.82±14.05)vs(51.48±18.89)U/L]、谷草转氨酶[(25.61±7.87) vs (31.54±10.75)U/L]、谷氨酰转肽酶[(47.53±15.80) vs (53.44±15.00)U/L]和hsC-RP[(2.18±0.34)vs(2.69±0.53) mg/L]明显降低(P<0.05或P<0.01);APN水平[(10.44±3.29)vs(8.48±2.67) mg/L]明显升高. 结论 与二甲双胍相比,艾塞那肽用于T2DM合并NAFLD患者在有效控制血糖及降低体重的同时可更好地改善肝酶学指标.  相似文献   

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AIM:To investigate the potential association of circulating zonulin with the stage of liver disease in obese children with biopsy-confirmed nonalcoholic fatty liver disease(NAFLD).METHODS:A case-control study was performed.Cases were 40 obese children with NAFLD.The diagnosis of NAFLD was based on magnetic resonance imaging(MRI)with high hepatic fat fraction(HFF≥5%),and confirmed by liver biopsy with≥5%of hepatocytes containing macrovesicular fat.Controls were selected from obese children with normal levels of aminotransferases,and without MRI evidence of fatty liver as well as of other causes of chronic liver diseases.Controls were matched(1-to 1)with the cases on age,gender,pubertal stage and as closely as possible on body mass index-standard deviation score.All participants underwent clinical examination,laboratory testsincluding zonulin,inflammatory and metabolic parameters,and MRI for measurement of HFF and visceral adipose tissue.RESULTS:Zonulin values were significantly greater in obese subjects with NAFLD than in those without NAFLD[median(interquartile range),4.23(3.18-5.89)vs 3.31(2.05-4.63),P<0.01].In patients with NAFLD,zonulin concentrations increased significantly with the severity of steatosis and the Spearman’s coefficient revealed a positive correlation between zonulin values and steatosis(r=0.372,P<0.05);however,we did not find a significant correlation between zonulin and lobular inflammation(P=0.23),ballooning(P=0.10),fibrosis score(P=0.18),or presence of nonalcoholic steatohepatitis(P=0.17).Within the entire study population,zonulin levels were positively associated with gamma-glutamyl transferase,2-h insulin,HFF,and negatively associated with whole-body insulin sensitivity index(WBISI),after adjustment for age,gender and pubertal status.When the associations were restricted to the group of NAFLD patients,2-h insulin,hepatic fat,and WBISI retained statistical significance.CONCLUSION:Circulating zonulin is increased in children and adolescents with NAFLD and correlates with the severity of steatosis.  相似文献   

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AIM: To investigate bone mineral density (BMD) in obese children with and without nonalcoholic fatty liver disease (NAFLD); and the association between BMD and serum adipokines, and high-sensitivity C-reactive protein (HSCRP). METHODS: A case-control study was performed. Cases were 44 obese children with NAFLD. The diagnosis of NAFLD was based on magnetic resonance imaging (MRI) with high hepatic fat fraction (≥ 5%). Other causes of chronic liver disease were ruled out. Controls were selected from obese children with normal levels of aminotransferases, and without MRI evidence of fatty liver as well as of other causes of chronic liver diseases. Controls were matched (1-to 1-basis) with thecases on age, gender, pubertal stage and as closely as possible on body mass index-SD score. All participants underwent clinical examination, laboratory tests, and whole body (WB) and lumbar spine (LS) BMD by dual energy X-ray absorptiometry. BMDZ-scores were calcu- lated using race and gender specific LMS curves. RESULTS: Obese children with NAFLD had a significantly lower LS BMDZ-score than those without NAFLD [mean, 0.55 (95%CI: 0.23-0.86) vs 1.29 (95%CI: 0.95-1.63); P < 0.01]. WB BMD Z-score was also decreased in obese children with NAFLD compared to obese children with no NAFLD, though borderline significance was observed [1.55 (95%CI: 1.23-1.87) vs 1.95 (95%CI: 1.67-2.10); P = 0.06]. Children with NAFLD had significantly higher HSCRP, lower adiponectin, but similar leptin levels. Thirty five of the 44 children with MRI-diagnosed NAFLD underwent liver biopsy. Among the children with biopsy-proven NAFLD, 20 (57%) had nonalcoholic steatohepatitis (NASH), while 15 (43%) no NASH. Compared to children without NASH, those with NASH had a significantly lower LS BMD Z-score [mean, 0.27 (95%CI: -0.17-0.71) vs 0.75 (95%CI: 0.13-1.39); P < 0.05] as well as a significantly lower WB BMD Z-score [1.38 (95%CI: 0.89-1.17) vs 1.93 (95%CI: 1.32-2.36); P < 0.05]. In multiple regression analysis, NASH (standardized β coefficient,  相似文献   

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目的 探讨高脂饮食诱导的胰岛素抵抗(IR)小鼠visfatin表达的改变及有氧运动对visfatin表达及脂代谢的影响.方法 雄性C57BL/6小鼠24只,按随机数字表随机分为普通饮食组(n=12)和高脂饮食组(n=12),后者喂养8周高脂饲料建立IR模型,再各自分为普通饮食对照组(n=6)、普通饮食运动组(n=6)、高脂饮食对照组(n=6)、高脂饮食运动组(n=6).两个运动组进行6周跑台训练,各组饮食不变.14周后ELISA检测小鼠血清visfatin,Western印迹检测腓肠肌、肝脏及睾周脂肪visfatin表达.结果 8周后,与普通饮食组相比,高脂饮食组空腹胰岛素水平升高,血糖曲线下面积增加(t=6.32,17.44,P均<0.01).14周后,高脂饮食运动组血清visfatin水平低于高脂饮食对照组,而普通饮食运动组血清visfatin水平高于普通饮食对照组(F=43.59,P<0.05).高脂饮食运动组骨骼肌、肝脏、内脏脂肪组织中visfatin蛋白表达水平较高脂饮食对照组降低(F=29.33~85.17,P均<0.05),普通饮食运动组骨骼肌visfatin表达较普通饮食对照组升高(F=52.79,P<0.05),但肝脏、内脏脂肪组织visfatin蛋白表达在普通饮食组间无明显变化(P均>0.05).结论 高脂饮食可以增加IR模型动物visfatin水平,有氧运动能有效下调visfatin的表达,改善脂代谢紊乱.  相似文献   

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Rats fed a high carbohydrate diet containing 10 or 100 ppm cimaterol for 4 weeks gained 41% to 59% less fat and 70% to 76% more protein than controls, with no major changes in either energy gain or efficiency of energy retention. Effects of cimaterol on lipid metabolism in these rats were assessed. Cimaterol stimulated lipolysis in vivo and in vitro, but failed to influence rates of de novo fatty acid synthesis in either liver or white adipose tissue. Activities of fatty acid synthetase and malic enzyme in these tissues were also unaffected by cimaterol. Cimaterol administered in vivo failed to affect lipoprotein lipase activity in white adipose tissue, but elevated enzyme activity 67% to 75% in the extensor digitorium longus muscle. Lipoprotein lipase activity in the extensor digitorum longus muscle was also elevated by 66% during a 2 hour incubation with 1 mmol/L cimaterol. We conclude that cimaterol selectively stimulates both lipolysis in white adipose tissue and lipoprotein lipase activity in skeletal muscle, to direct energy away from adipose tissue deposition toward skeletal muscle accretion.  相似文献   

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CONTEXT: The recently discovered hormone resistin is linked to the development of insulin resistance, but direct evidence of resistin levels in humans with nonalcoholic fatty liver disease (NAFLD) is lacking. METHODS: We conducted this study to assess the relationship between serum resistin and NAFLD. We measured serum resistin and biochemical, hormonal, and histological correlates in 28 NAFLD patients, 33 controls, and 30 obese patients [body mass index (BMI), >30 kg/m2] without NAFLD. RESULTS: Resistin and adiponectin expression were measured in sc adipose tissue by quantitative RT-PCR. Resistin was higher in NAFLD patients compared with controls (5.87 +/- 0.49 vs. 4.30 +/- 0.20 ng/ml; P = 0.002) and obese patients (4.37 +/- 0.27 ng/ml; P = 0.002). Increased resistin mRNA was also found in the adipose tissue of NAFLD patients compared with controls and obese subjects. CONCLUSIONS: Both NAFLD and obese patients had lower adiponectin levels, whereas leptin was increased only in the obese group. No correlation was found between resistin and high-sensitivity C-reactive protein, BMI, homeostasis model assessment, insulin, glucose, transaminases, and lipid values. A positive correlation was found between resistin and histological inflammatory score. These data report increased resistin in NAFLD patients that is related to the histological severity of the disease, but do not support a link between resistin and insulin resistance or BMI in these patients.  相似文献   

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Chronic elevations in alanine aminotransferase (ALT) levels are associated with body composition. The aim of this study was to evaluate the relationship between elevated liver enzyme levels and the visceral tissue area in subjects with and without nonalcoholic fatty liver disease (NAFLD).An observational cohort study was conducted with subjects undergoing general health examinations. To evaluate the visceral and subcutaneous abdominal adipose tissue area, a computed tomography scan was performed. NAFLD was diagnosed if a person demonstrated fatty liver on ultrasonography without a history of significant alcohol consumption or chronic liver disease. Abnormal liver enzyme levels were based on ALT elevations according to the updated Asian definition.Of the 5100 subjects, 3712 (72.8%) met the inclusion criteria, and NAFLD was found in 1185 subjects. Elevated ALT values were positively correlated with body mass index, waist circumference, and subcutaneous and visceral adipose tissue area. These relationships were attenuated, although they remained significant in a dose-dependent manner, after adjusting for multiple liver injury risk factors. In addition, when body mass index and subcutaneous and visceral tissue areas were finally considered in combination, only visceral adipose tissue remained independently associated with elevated ALT levels in the ultrasonographically diagnosed NAFLD group (P for trend <0.001 for men and women).Elevated ALT levels were independently and dose-dependently associated with visceral fat accumulation in the healthy general population, especially in ultrasonographically diagnosed NAFLD patients. These results reemphasize the importance of visceral fat in the pathogenesis of NAFLD.  相似文献   

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Adipose triglyceride lipase (ATGL) null (-/-) mice store vast amounts of triacylglycerol in key glucoregulatory tissues yet exhibit enhanced insulin sensitivity and glucose tolerance. The mechanisms underpinning these divergent observations are unknown but may relate to the reduced availability of circulating fatty acids. The aim of this study was to determine whether the enhancements in insulin stimulated glucose metabolism in ATGL-/- mice persist when challenged with a high-fat diet. ATGL-/- mice fed a low-fat diet exhibit improved whole-body insulin sensitivity and glucose tolerance compared with wild-type mice. Wild-type mice became hyperlipidemic and insulin-resistant when challenged with a high-fat diet (HFD, 60% fat) for 4 wk. ATGL-/- mice fed a HFD had elevated circulating fatty acids but had reduced fasting glycemia compared to pre-high-fat diet levels and were refractory to glucose intolerance and insulin resistance. This protection from high-fat diet-induced metabolic perturbations was associated with a preference for fatty acid utilization but reduced energy expenditure and no change in markers of mitochondrial capacity or density. The protection from high-fat diet-induced insulin resistance in ATGL-/- mice was due to increased cardiac and liver insulin-stimulated glucose clearance despite increased lipid content in these tissues. Additionally, there was no difference in skeletal muscle insulin-stimulated glucose disposal, but there was a reduction observed in brown adipose tissue. Overall, these results show that ATGL-/- mice are protected from HFD-induced insulin resistance and reveal a tissue specific disparity between lipid accumulation and insulin sensitivity.  相似文献   

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It has been demonstrated the involvement of branched-chain amino acids (BCAA) on obesity and related metabolic disorder. We investigated the effects of branched-chain amino acids (BCAA) on obesity and on glucose/fat homeostasis in mice fed on a high-fat (45%) diet. BCAA was dissolved in 0.5% methylcellulose and added to the drinking water (BCAA-treated group). A high-fat diet was provided for 6 weeks and BCAA was given for 2 weeks. The BCAA-treated group gained almost 7% less body weight and had less epididymal adipose tissue (WAT) mass than the control group (p<0.05). BCAA supplementation also reduced the hepatic and skeletal muscle triglyceride (TG) concentrations (p<0.05). The hepatic levels of PPAR-alpha and uncoupling protein (UCP) 2, and the level of PPAR-alpha and UCP3 in the skeletal muscle were greater in the BCAA-treated group than in the control mice (p<0.05). These results demonstrate that the liver and muscle TG concentration are less in BCAA-treated group. BCAA affects PPAR-alpha and UCP expression in muscle and liver tissue.  相似文献   

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Background. There is sparse literature on the association of adipose tissue with liver histology in patients with nonalcoholic fatty liver disease (NAFLD).Aim. To study the correlation of visceral adipose tissue (VAT), subcutaneous adipose tissue (SAT) and total adipose tissue (TAT) with liver histology in Indian patients with NAFLD.Material and methods. A single slice CT scan at the level of L4-L5 vertebrae was done to assess the abdominal VAT and SAT volumes in 21 patients with histological diagnosis of NAFLD. Adult treatment panel III criteria with modified abnormal waist were used to define metabolic syndrome (MS). Histological grading was done according to the NAFLD activity score (NAS).Results. Twenty-one patients with NAFLD [13 males, median age: 35 years, median BMI: 25.97 kg/m2] were included prospectively. Even though overweight/obese patients had severe liver disease, there was no difference in the volume of VAT adjusted for BMI between 6 (28.5%) lean and 15 (71.5%) overweight/obese patients. Patients with NASH and borderline NASH were older, obese with higher VAT and SAT volumes than no-NASH group. SAT volume (SATV) correlated significantly with hepatic steatosis but none of the adipose tissue volumes had any correlation with other histological variables. Both SATV and TAT volume (TATV) correlated significantly with severity of liver disease as determined by NAS score whereas presence of MS or insulin resistance had no correlation with histological severity.Conclusion. Both subcutaneous and total adipose tissue volume are related to the disease severity as determined by NAFLD activity score in Indian patients with NAFLD.  相似文献   

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