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Endocrinology, Vol 124, 2046-2051, Copyright © 1989 by Endocrine Society

ARTICLES

Direct effect of methimazole on rat thyroidal cell growth induced by thyrotropin and insulin-like growth factor I

S Taniguchi, A Yoshida and H Mashiba
First Department of Internal Medicine, Tottori University School of Medicine, Yonago, Japan.

The direct effect of methimazole (MMI) on FRTL-5 cell growth was examined. TSH, (Bu)2cAMP, calf serum, insulin-like growth factor I, and Graves' immunoglobulin (IgG) increased [3H]thymidine incorporation into DNA during 72-h incubation. MMI (10(-3) M), which does not damage cell viability, significantly enhanced the increase in [3H]thymidine incorporation induced by TSH and (Bu)2cAMP. In contrast, MMI suppressed the increase in [3H]thymidine incorporation induced by calf serum, insulin-like growth factor I, and Graves' IgG. MMI had no effect on the production of cAMP by TSH. Accordingly, we concluded that MMI has opposite effects on cAMP- and non-cAMP-dependent cell growth pathways. Moreover, Graves' IgG, which has a modest effect on cAMP production, is believed to induce cell growth via the non-cAMP dependent cell growth pathway.


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T. Kimura, A. Van Keymeulen, J. Golstein, A. Fusco, J. E. Dumont, and P. P. Roger
Regulation of Thyroid Cell Proliferation by TSH and Other Factors: A Critical Evaluation of in Vitro Models
Endocr. Rev., October 1, 2001; 22(5): 631 - 656.
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