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Endocrinology, Vol 123, 1631-1635, Copyright © 1988 by Endocrine Society

ARTICLES

There is a nyctohemeral rhythm of type II iodothyronine 5'-deiodinase activity in rat anterior pituitary

M Murakami, K Tanaka and MA Greer
Department of Medicine, Oregon Health Sciences University, Portland 97201.

We found a nyctohemeral rhythm of type II iodothyronine 5'-deiodinase (5'-D-II) with a zenith at midnight in rat anterior pituitary, but not in brown adipose tissue. There was no nyctohemeral rhythm of 5'-D-I in anterior pituitary, liver, or kidney. Hypothyroidism abolished the nyctohemeral rhythmicity in anterior pituitary 5'-D-II. The rhythmicity of anterior pituitary 5'-D-II may play a role in setting the nyctohemeral rhythm of TSH secretion by regulating the degree of negative feedback by locally generated T3 in the thyrotroph.


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