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Isolated rat renal tubules prepared by collagenase digestion were used to study the effects of 3,3',5'-tri-iodothyronine ('reverse T3', rT3) and other iodothyronines on the formation of 3,3',5-tri-iodothyronine (T3) from thyroxine (T4). rT3 inhibited the conversion with a dose response over the concentration range 1.5nM-1.5microM. The inhibition was competitive in nature. Both 3,3'-di-iodothyronine and 3',5'-di-iodothyronine also inhibited the production of T3 and T4 in isolated rat renal tubules, but tetraiodothyroacetic acid and 3,5-di-iodothyronine were found to have no effect. These experiments demonstrate in an intact cell system that some naturally occurring iodothyronines have significant effects on T4 deiodination.

The effect of iodothyronines on the conversion of thyroxine into 3,3′-5-tri-iodothyronine in isolated rat renal tubules