<i>Soat2</i> ties cholesterol metabolism to β‐oxidation and glucose tolerance in male mice
Camilla Pramfalk, Osman Ahmed, Matteo Pedrelli, Mirko E. Minniti, Serge Luquet, Raphaël GP Denis, Maria Olin, Jennifer Härdfeldt, Lise‐Lotte Vedin, Knut R Steffensen, Mikael Rydén, Leanne Hodson, Mats Eriksson, Paolo Parini
Abstract
Abstract Background Sterol O ‐acyltransferase 2 ( Soat2) encodes acyl‐coenzyme A:cholesterol acyltransferase 2 (ACAT2 ) , which synthesizes cholesteryl esters in hepatocytes and enterocytes fated either to storage or to secretion into nascent triglyceride‐rich lipoproteins. Objectives We aimed to unravel the molecular mechanisms leading to reduced hepatic steatosis when Soat2 is depleted in mice. Methods Soat2 −/− and wild‐type mice were fed a high‐fat, a high‐carbohydrate, or a chow diet, and parameters of lipid and glucose metabolism were assessed. Results Glucose, insulin, homeostatic model assessment for insulin resistance (HOMA‐IR), oral glucose tolerance (OGTT), and insulin tolerance tests significantly improved in Soat2 −/− mice, irrespective of the dietary regimes (2‐way ANOVA). The significant positive correlations between area under the curve (AUC) OGTT ( r = 0.66, p < 0.05), serum fasting insulin ( r = 0.86, p < 0.05), HOMA‐IR ( r = 0.86, p < 0.05), Adipo‐IR (0.87, p < 0.05), hepatic triglycerides (TGs) ( r = 0.89, p < 0.05), very‐low‐density lipoprotein (VLDL)‐TG ( r = 0.87, p < 0.05) and the hepatic cholesteryl esters in wild‐type mice disappeared in Soat2 −/− mice. Genetic depletion of Soat2 also increased whole‐body oxidation by 30% ( p < 0.05) compared to wild‐type mice. Conclusion Our data demonstrate that ACAT2‐generated cholesteryl esters negatively affect the metabolic control by retaining TG in the liver and that genetic inhibition of Soat2 improves liver steatosis via partitioning of lipids into secretory (VLDL‐TG) and oxidative (fatty acids) pathways.