title: Substituting dietary polyunsaturated fat with monounsaturated fat increases insulin sensitivity in cultured rat hepatocytes.
abstract: Increased dietary fat intake generally, and saturated fat specifically, will lead to impairment of insulin action and to development of metabolic syndrome. The aim of this study was to find out changing of hepatic glucose output in dependence of high monounsaturated and high polyunsaturated fat diet and possible direct action of insulin in hepatocytes. Hepatocytes were isolated by a collagenase perfusion technique and cultured for 24 h in M 199 serum-free medium. The glucose production in hepatocytes isolated from rats on high polyunsaturated fat diet, as well as those isolated from rats on high monounsaturated fat diet was significantly higher than in standard controls. Insulin significantly decreased glucose production but only in hepatocytes obtained from rats on high monounsaturated fat diet. On the other side energy expenditure was significantly higher in rats on high monounsaturated fat diet and significantly lower in rats on high polyunsaturated fat diet comparable with animals on standard diet. Monounsaturated fat in Mediterranean diet could have beneficial effect on the development of the metabolic syndrome by increasing insulin sensitivity and energy expenditure.
authors.affiliation: Department of Physiology, School of Dentistry, University of Zagreb, Zagreb, Croatia. jrosa@mef.hr
authors.forename: Jagoda
authors.initials: J
authors.lastname: Rosa
authors.forename: Anja
authors.initials: A
authors.lastname: Baraba
authors.forename: Petra
authors.initials: P
authors.lastname: Bucević
authors.forename: Darija
authors.initials: D
authors.lastname: Dordijevski
authors.forename: Ivan
authors.initials: I
authors.lastname: Antolković
authors.forename: Josip
authors.initials: J
authors.lastname: Rosa
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004042:Dietary Fats, Unsaturated / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism; D022781:Hepatocytes / Q000378:metabolism*; D007333:Insulin Resistance; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D015430:Weight Gain
chemical_list: D004042:Dietary Fats, Unsaturated; D005947:Glucose