In vitro Conversion of Thyroxin to Triiodothyronine by Kidney Slices.

Abstract
Chromato-graphically pure I131-labeled l-thyroxin was added to surviving kidney slices which were incubated in a modified Krebs-Ringer phosphate solution. Following incubation, the slices were homogenized, extracted with butanol and the thyroxin and triiodothyronine were separated and identified by paper chromatog-raphy. The triiodothyronine was radioactive. This was taken as evidence of deiodination of thyroxin to triiodothyronine. Conversion of thyroxin to triiodothyronine was reduced by excess iodide and abolished by boiling the tissue or by addition of KCN to the media.

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