title: Stearoyl-CoA desaturase-1 deficiency attenuates obesity and insulin resistance in leptin-resistant obese mice.
abstract: Obesity and adiposity greatly increase the risk for secondary conditions such as insulin resistance. Mice deficient in the enzyme stearoyl-CoA desaturase-1 (SCD1) are lean and protected from diet-induced obesity and insulin resistance. In order to determine the effect of SCD1 deficiency on various mouse models of obesity, we introduced a global deletion of the Scd1 gene into leptin-deficient ob/ob mice, leptin-resistant Agouti (A(y)/a) mice, and high-fat diet-fed obese (DIO) mice. SCD1 deficiency lowered body weight, adiposity, hepatic lipid accumulation, and hepatic lipogenic gene expression in all three mouse models. However, glucose tolerance, insulin, and leptin sensitivity were improved by SCD1 deficiency only in A(y)/a and DIO mice, but not ob/ob mice. These data uncouple the effects of SCD1 deficiency on weight loss from those on insulin sensitivity and suggest a beneficial effect of SCD1 inhibition on insulin sensitivity in obese mice that express a functional leptin gene.
authors.affiliation: Department of Biochemistry, University of Wisconsin-Madison, 433, Babcock Drive, Madison, WI 53706, USA.
authors.forename: Makoto
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Harini
authors.initials: H
authors.lastname: Sampath
authors.forename: Xueqing
authors.initials: X
authors.lastname: Liu
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Flowers
authors.forename: Kiki
authors.initials: K
authors.lastname: Chu
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Dobrzyn
authors.forename: James M
authors.initials: JM
authors.lastname: Ntambi