PMID: 8999918Jan 24, 1997Paper

"Spot 14" protein functions at the pretranslational level in the regulation of hepatic metabolism by thyroid hormone and glucose.

The Journal of Biological Chemistry
S B BrownW B Kinlaw

Abstract

"Spot 14" protein appears rapidly in nuclei of hepatocytes exposed to glucose and thyroid hormone. Exposure of glucose- and T3-treated hepatocytes to a spot 14 antisense oligonucleotide inhibited induction of mRNAs encoding malic enzyme, ATP citrate-lyase, fatty acid synthase, liver-type pyruvate kinase, phosphoenolpyruvate carboxykinase, and type I deiodinase but not hydroxymethylglutaryl-CoA reductase, cytochrome c, and actin mRNAs. Induction of spot 14, ATP citrate-lyase, and fatty acid synthase polypeptides, but not propionyl-CoA carboxylase and mitochondrial pyruvate carboxylase, was inhibited. Antisense treatment of hepatocytes transfected with a reporter controlled by a glucose- and T3-inducible fragment of the pyruvate kinase gene promoter inhibited reporter activity, as did cotransfection of the reporter and a spot 14 antisense plasmid. Spot 14 protein acts in the induction of mRNAs coding for key lipogenic (malic enzyme, ATP citrate-lyase, fatty acid synthase), glycolytic (pyruvate kinase), and gluconeogenic enzymes (phosphoenolpyruvate carboxykinase), as well as the diet-responsive type I deiodinase, but not those involved in mitochondrial respiration (cytochrome c) or cholesterol synthesis (hydroxymethylglutaryl-CoA...Continue Reading

Citations

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