Role of ceramide-to-dihydroceramide ratios for insulin resistance and non-alcoholic fatty liver disease in humans. Issue 2 (20th November 2020)

• Record Type: Journal Article
• Authors: Apostolopoulou, Maria; Gordillo, Ruth; Gancheva, Sofiya; Strassburger, Klaus; Herder, Christian; Esposito, Irene; Schlensak, Matthias; Scherer, Philipp E; Roden, Michael
• Is Part Of: BMJ open diabetes research and care. Volume 8:Issue 2(2020)
• Publication Date: 2020-11-20
• Subjects: insulin resistance -- non-alcoholic fatty liver disease -- inflammation -- obesity; Diabetes -- Periodicals; 616.462005
• DOI: 10.1136/bmjdrc-2020-001860
• Languages: English
• ISSNs: 2052-4897

Abstract

Abstract : Introduction: Sphingolipid 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 methods: Thus, 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. Results: Surprisingly, 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. Conclusion: These 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.