Pyruvate dehydrogenase kinase 4 (PDK4) regulates pyruvate oxidation through the phosphorylation and inhibition of the pyruvate dehydrogenase complex (PDC). The PDC catalyzes the conversion of pyruvate to acetyl-CoA and it is an important control point in glucose and pyruvate metabolism. Previous studies have showed that PDK4 gene expression is induced by thyroid hormone (T3), however, these studies did not investigate the mechanisms by which T3 regulated PDK4 gene expression. In this book, I have examined the role of the thyroid hormone receptor (TR), transcriptional coactivators especially...