AJP - Endo AJP: Endocrinology and Metabolism
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Am J Physiol Endocrinol Metab 237: E147-E151, 1979;
0193-1849/79 $5.00
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AJP: Endocrinology and Metabolism, Vol 237, Issue 2, E147-E151
Copyright © 1979 by American Physiological Society

ARTICLES

Accumulation of radioiodine in thiouracil-hyperplastic thyroids of chicks

WS Newcomer

Kinetics of accumulation of radioiodine was studied in thyroids of chickens before, during, and following ingestion of 0.25% thiouracil (TU). After a latent period of about 5 days, weight of the thyroid gland increased, reaching its maximum (42 mg/100 g body wt) after 21 days of TU ingestion; thyroid weight decreased immediately on withdrawal of TU but tended to plateau at a higher level than that of controls. One-way clearance increased by day 4 of ingestion of TU and reached its peak early during hyperplasia; it very quickly reverted to a control level on withdrawal of TU. Exit-rate constant increased markedly during early hyperplasia and decreased to a level less than normal after withdrawal of TU. Concentration of 127I decreased by a factor of 18 by 2 wk of feeding TU; it increased to practically a normal level by 1 wk after withdrawal of TU.




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