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. 1996 Sep 3;93(18):9443–9448. doi: 10.1073/pnas.93.18.9443

Peroxisome proliferators induce mouse liver stearoyl-CoA desaturase 1 gene expression.

C W Miller 1, J M Ntambi 1
PMCID: PMC38447  PMID: 8790349

Abstract

Peroxisome proliferators induce stearoyl-CoA desaturase activity (EC 1.14.99.5) in liver [Kawashima, Y., Hanioka, N., Matsumura, M. & Kozuka, H. (1983) Biochim. Biophys. Acta 752, 259-264]. We analyzed the changes in stearoyl-CoA desaturase 1 (SCD1) mRNA to further define the molecular mechanism for the induction of stearoyl-CoA desaturase by peroxisome proliferators. SCD1 mRNA was analyzed from the livers of BALB/c mice that had been fed diets supplemented with clofibrate or gemfibrozil. Clofibrate was found to induce liver SCD1 mRNA levels 3-fold within 6 hr to a maximum of 22-fold in 30 hr. Gemfibrozil administration resulted in a similar induction pattern. This induction is primarily due to an increase in transcription of the SCD1 gene, as shown by nuclear run-on transcription assays and DNA deletion analysis of transfected SCD1-chloramphenicol acetyltransferase fusion genes. The cis-linked response element for peroxisome proliferator-activated receptor (PPAR) was localized to an AGGTCA consensus sequence between base pairs -664 to -642 of the SCD1 promoter. Clofibrate-mediated induction of SCD1 mRNA was shown to be independent of polyunsaturated fatty acids, with peroxisome proliferators and arachidonic acid having opposite effects on SCD1 mRNA levels. Additionally, the activation of SCD1 mRNA by clofibrate was inhibited 77% by cycloheximide administration. Levels of liver beta-actin and albumin mRNAs were unchanged by these dietary manipulations. Our data show that hepatic SCD1 gene expression is regulated by PPARs and suggest that peroxisome proliferators and poly-unsaturated fatty acids act through distinct mechanisms.

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