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  • Title: Possible role of microtubules in thyroid secretion.
    Author: Williams JA, Wolff J.
    Journal: Proc Natl Acad Sci U S A; 1970 Dec; 67(4):1901-8. PubMed ID: 4321351.
    Abstract:
    Colchicine and other microtubule-active agents have been found to block the release, stimulated by either thyroid-stimulating hormone or by dibutyryl cyclic adenosine 3':5'-monophosphate, of (131)I from previously (131)I-labeled mouse thyroid glands in vitro. The time and concentration characteristics of these inhibitors are consistent with their actions on microtubules in other systems. [(3)H]colchicine was also shown to be bound to a soluble 6S protein of bovine thyroid slices similar to the protein identified in other systems as a microtubular subunit. The demonstrated inhibition of colloid droplet formation and absence of an effect on thyroidal adenyl cyclase or cyclic 3':5'-phosphodiesterase suggests a colchicine-sensitive role for microtubules in colloid endocytosis in the thyroid gland.
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