Potential Role of Overexpression of 11β-Hydroxysteroid Dehydrogenase Type 1 in Visceral Adipose Tissue and Portal Hypercortisolism in the Pathogenesis of Non-Alcoholic Fatty Liver Disease

2011 ◽  
Vol 140 (5) ◽  
pp. S-904
Author(s):  
Roberto Candia ◽  
Arnoldo Riquelme ◽  
Rene Baudrand ◽  
Cristian A. Carvajal ◽  
Mauricio Morales ◽  
...  
2010 ◽  
Vol 7 (2) ◽  
pp. 96 ◽  
Author(s):  
An Verrijken ◽  
Sven Francque ◽  
Luc Van Gaal ◽  
◽  
◽  
...  

Non-alcoholic fatty liver disease (NAFLD), the most common cause of chronic liver disease in Western countries, comprises a disease spectrum ranging from simple steatosis to non-alcoholic steatohepatitis (NASH), advanced fibrosis and cirrhosis. Fatty liver develops when fatty acid uptake and de novo fatty acid synthesis exceed fatty acid oxidation and export as very low-density lipoprotein/triglycerides. Because of its high prevalence and its association with obesity, metabolic syndrome, type 2 diabetes, dyslipidaemia and hypertension, NAFLD has become an important public health problem. The pathogenesis of NAFLD has to date not been completely clarified. Research has been conducted regarding the role of insulin resistance, lipotoxicity, oxidative stress and chronic inflammation. Visceral adipose tissue has increasingly been recognised as a biologically active organ contributing to the pathogenesis of NAFLD. Its role in the development of fatty liver might be situated at several levels: as a source of free fatty acids, by the production of adipocytokines, as a cause of insulin resistance and by inflammation.


2020 ◽  
Vol 131 ◽  
pp. 110785
Author(s):  
Samukelisiwe C. Shabalala ◽  
Phiwayinkosi V. Dludla ◽  
Lawrence Mabasa ◽  
Abidemi P. Kappo ◽  
Albertus K. Basson ◽  
...  

2020 ◽  
Vol 8 (2) ◽  
pp. e001860
Author(s):  
Maria Apostolopoulou ◽  
Ruth Gordillo ◽  
Sofiya Gancheva ◽  
Klaus Strassburger ◽  
Christian Herder ◽  
...  

IntroductionSphingolipid accumulation has been linked to obesity, type 2 diabetes and non-alcoholic fatty liver disease (NAFLD). A recent study showed that depletion of dihydroceramide desaturase-1 (DES-1) in adipose and/or liver tissue decreases ceramide-to-dihydroceramide ratios (ceramide/dihydroceramide) in several tissues and improves the metabolic profile in mice. We tested the hypothesis that ceramide/dihydroceramide would also be elevated and relate positively to liver fat content and insulin resistance in humans.Research design and methodsThus, we assessed total and specific ceramide/dihydroceramide in various biosamples of 7 lean and 21 obese volunteers without or with different NAFLD stages, who were eligible for abdominal or bariatric surgery, respectively. Biosamples were obtained from serum, liver, rectus abdominis muscle as well as subcutaneous abdominal and visceral adipose tissue during surgery.ResultsSurprisingly, certain serum and liver ceramide/dihydroceramide ratios were reduced in both obesity and non-alcoholic steatohepatitis (NASH) and related inversely to liver fat content. Specifically, hepatic ceramide/dihydroceramide (species 16:0) related negatively to hepatic mitochondrial capacity and lipid peroxidation. In visceral adipose tissue, ceramide/dihydroceramide (species 16:0) associated positively with markers of inflammation.ConclusionThese results failed to confirm the relationships of ceramide/dihydroceramide in humans with different degree of insulin resistance. However, the low hepatic ceramide/dihydroceramide favor a role for dihydroceramide accumulation in NASH, while a specific ceramide/dihydroceramide ratio in visceral adipose tissue suggests a role of ceramides in obesity-associated low-grade inflammation.


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