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This Article Full Text Full Text (PDF) All Versions of this Article: 288/3/E599    most recent 00439.2004v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (32) Citing Articles via Google Scholar Google Scholar Articles by Dobrzyn, A. Articles by Ntambi, J. M. Search for Related Content PubMed PubMed Citation Articles by Dobrzyn, A. Articles by Ntambi, J. M.

Stearoyl-CoA desaturase-1 deficiency reduces ceramide synthesis by downregulating serine palmitoyltransferase and increasing -oxidation in skeletal muscle

Departments of ¹Biochemistry and ⁵Nutritional Sciences, University of Wisconsin-Madison, Madison, Wisconsin; ²Laboratory of Molecular Genetics and ⁴Howard Hughes Medical Institute, The Rockefeller University, New York, New York; and ³Division of Molecular Physiology, School of Life Sciences, Dundee University, Dundee, United Kingdom

Submitted 15 September 2004 ; accepted in final form 15 November 2004

Stearoyl-CoA desaturase (SCD) has recently been shown to be a critical control point of lipid partitioning and body weight regulation. Lack of SCD1 function significantly increases insulin sensitivity in skeletal muscles and corrects the hypometabolic phenotype of leptin-deficient ob/ob mice, indicating the direct antilipotoxic action of SCD1 deficiency. The mechanism underlying the metabolic effects of SCD1 mutation is currently unknown. Here we show that SCD1 deficiency reduced the total ceramide content in oxidative skeletal muscles (soleus and red gastrocnemius) by 40%. The mRNA levels and activity of serine palmitoyltransferase (SPT), a key enzyme in ceramide synthesis, as well as the incorporation of [¹⁴C]palmitate into ceramide were decreased by 50% in red muscles of SCD1^–/– mice. The content of fatty acyl-CoAs, which contribute to de novo ceramide synthesis, was also reduced. The activity and mRNA levels of carnitine palmitoyltransferase I (CPT I) and the rate of -oxidation were increased in oxidative muscles of SCD1^–/– mice. Furthermore, SCD1 deficiency increased phosphorylation of AMP-activated protein kinase (AMPK), suggesting that AMPK activation may be partially responsible for the increased fatty acid oxidation and decreased ceramide synthesis in red muscles of SCD1^–/– mice. SCD1 deficiency also reduced SPT activity and ceramide content and increased AMPK phosphorylation and CPT I activity in muscles of ob/ob mice. Taken together, these results indicate that SCD1 deficiency reduces ceramide synthesis by decreasing SPT expression and increasing the rate of -oxidation in oxidative muscles.

adenosine 5'-monophosphate-activated protein kinase; ob/ob mouse; leptin; carnitine palmitoyltransferase

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