Thyroid hormone inhibition of intermediary metabolism in dog thyroid slices stimulated by different agonists.

Abstract:

:The role of thyroid hormones in a short loop feedback in the thyroid is controversial. This process was studied in dog thyroid slices stimulated by TSH, carbachol and phorbol esters. Incubation of thyroid slices with T3 and T4 for 1 hour inhibited the subsequent stimulation of glucose oxidation induced by carbachol and phorbol esters but not by TSH. T3 also inhibited the stimulation of 32P incorporation into phospholipids stimulated by these two agonists. Glucose oxidation stimulated by TSH, carbachol and 12-0-tetradecanoyl-phorbol-13-acetate (TPA) was inhibited by rT3 and the inhibition was not reversed by methimazole, which did abolish the inhibition induced by iodide, MIT and DIT. TSH stimulation of cAMP was not blocked by T3 or T4 but was by rT3 and MIT- and DIT. The mechanism of such inhibition appears to be complex, possibly involving formation of iodide from rT3, MIT and DIT but also dependent on the intact iodothyronine. Moreover, our data suggest that T3 and T4 exert their inhibition on the thyroid through the phospholipids cascade and this mechanism is probably independent on the release of iodide from these iodocompounds.

journal_name

J Endocrinol Invest

authors

Pasquali D,Bellastella A,Field JB

doi

10.1007/BF03347936

subject

Has Abstract

pub_date

1991-11-01 00:00:00

pages

825-30

issue

10

eissn

0391-4097

issn

1720-8386

journal_volume

14

pub_type

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