Abstract

In studies using primary cultures of adult rat hepatocytes in serum-free medium, peroxisomal fatty acyl-CoA oxidase activity was not altered by the presence of 3,5,3'-triiodothyronine, whereas time- and dose-dependent increases in the thyroid hormone-responsive enzyme mitochondrial glycero-3-phosphate dehydrogenase were seen. Activity of peroxisomal oxidase was stimulated with clofibric acid in the absence of 3,5,3'-triiodothyronine. The results demonstrate that hepatic peroxisomal fatty acyl-CoA oxidase activity is not directly regulated by 3,5,3'-triiodothyronine and that stimulation of peroxisomal fatty acyl-CoA oxidase activity by clofibric acid does not require thyroid hormone.

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