Down-regulated expression of PPARalpha target genes, reduced fatty acid oxidation and altered fatty acid composition in the liver of mice transgenic for hTNFalpha
| Autor: | Therese H. Røst, Rolf K. Berge, Hege Wergedahl, Antony J. Mullen, Pål Aukrust, Heidi Glosli, Oddrun Anita Gudbrandsen, Hans Prydz, Bente Halvorsen |
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| Rok vydání: | 2004 |
| Předmět: |
Fatty Acid Desaturases
Hydroxymethylglutaryl-CoA Synthase Male Down-Regulation Mice Transgenic Fatty Acids Monounsaturated chemistry.chemical_compound Mice Free fatty acid receptor 1 Coenzyme A Ligases Animals PPAR alpha RNA Messenger adipocyte protein 2 Molecular Biology Beta oxidation Fatty acid synthesis chemistry.chemical_classification biology Fatty acid metabolism Tumor Necrosis Factor-alpha Fatty Acids Cell Biology Peroxisome Keto Acids Fatty acid synthase chemistry Biochemistry Liver Models Animal biology.protein Female Fatty Acid Synthases Oxidation-Reduction Stearoyl-CoA Desaturase Polyunsaturated fatty acid |
| Zdroj: | Biochimica et biophysica acta. 1734(3) |
| ISSN: | 0006-3002 |
| Popis: | The present study investigated the hepatic regulation of fatty acid metabolism in hTNFalpha transgenic mice. Reduced hepatic mRNA levels and activities of carnitine palmitoyltransferase-II (CPT-II) and mitochondrial HMG-CoA synthase were observed, accompanied by decreased fatty acid oxidation, fatty acyl-CoA oxidase and fatty acid synthase (FAS) activities and down-regulated gene expression of mitochondrial acetyl-CoA carboxylase 2 (ACC2). The mRNA levels of peroxisome proliferator-activated receptor alpha (PPARalpha) and PPARdelta were reduced. The hepatic fatty acid composition was altered, with increased amounts of saturated and polyunsaturated fatty acids. The relative amounts of Delta(9) desaturated fatty acids were decreased, as was Delta(9)desaturase mRNA. The CPT-I mRNA level remained unchanged. The PPARalpha targeted genes CPT-II and HMG-CoA synthase are potential regulators of mitochondrial fatty acid oxidation and ketogenesis in hTNFalpha transgenic mice, and the increased propionyl-CoA level found is a possible inhibitor of these processes. Reduced mitochondrial and peroxisomal fatty acid oxidation may explain the increased hepatic triglyceride level induced by TNFalpha. This is not due to de novo fatty acid synthesis as both FAS activity and gene expression of ACC2 were reduced. |
| Databáze: | OpenAIRE |
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