GH and insulin affect fatty acid synthase activity in isolated porcine adipocytes in culture without any modifications of sterol regulatory element binding protein-1 expression.
The ability of GH to decrease fatness and insulin-regulated events such as lipogenic enzyme activities is well known in pigs. Nevertheless, the precise mechanism underlying these actions has not been elucidated yet. Expression of the transcription factor sterol regulatory element binding protein (SREBP)-1 has been reported as a key mediator of insulin action in rat hepatocytes and adipose cell lines. The present study aimed to determine whether the regulation of lipogenesis by GH and/or insulin in porcine adipocytes also involved SREBP-1. Isolated adipocytes, obtained from perirenal or s.c. adipose tissue samples of female pigs (51+/-0.4 kg; n=17), were cultured in serum-free medium in the absence or presence of these hormones for up to 4 days. Glucose incorporation and fatty acid synthase activity were increased by insulin in a dose-dependent manner in adipocytes of both sites. The increase was maximal at 1.7 and 17 nM in s.c. and perirenal adipocytes respectively, suggesting inter-depot differences in the regulation of lipogenesis by insulin. These insulin-stimulated events were decreased by GH (1 nM). No change in SREBP-1 mRNA levels was observed in response to GH and/or insulin. Taken together, these data indicate that the regulation of lipogenesis by insulin and GH appears to not involve changes in SREBP-1 mRNA levels in porcine adipocytes.
Louveau
I
I
Institut National de la Recherche Agronomique, Unité Mixte de Recherches sur le Veau et le Porc, 35590 Saint Gilles, France. louveau@st-gilles.rennes.inra.fr
Gondret
F
F
D017667:Adipocytes / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D015153:Blotting, Western / Q000379:methods; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism*; D002478:Cells, Cultured; D004268:DNA-Binding Proteins / Q000378:metabolism*; D064429:Fatty Acid Synthases / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry; D013006:Growth Hormone / Q000494:pharmacology*; D007328:Insulin / Q000494:pharmacology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051780:Sterol Regulatory Element Binding Protein 1; D013552:Swine; D014157:Transcription Factors
D022762:CCAAT-Enhancer-Binding Proteins; D004268:DNA-Binding Proteins; D007328:Insulin; D051780:Sterol Regulatory Element Binding Protein 1; D014157:Transcription Factors; D013006:Growth Hormone; D064429:Fatty Acid Synthases