Mills I, Barge RM, Silva JE, Larsen PR. Insulin stimulation of iodothyronine 5'-deiodinase in rat brown adipocytes.
Biochem Biophys Res Commun 1987;
143:81-6. [PMID:
3548728 DOI:
10.1016/0006-291x(87)90632-2]
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Abstract
Insulin (100-3333 microU/ml) stimulates iodothyronine 5'-deiodinase 3 to 4 fold in dispersed rat brown adipocytes. Deiodinase activity increased steadily from 1 to 4 hours. Insulin increased enzyme activity via an increase in the Vmax while the Km remained unchanged. Omission of glucose from the medium did not affect the insulin response. Studies with alpha-amanitin suggested that the increase in deiodinase activity was not due to an increase in the rate of transcription. The insulin effect was not additive to that of alpha 1-catecholamines, suggesting the two stimulators might have one or more common elements.
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