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  • Title: Thyroid-stimulating activity of human chorionic gonadotropin in sera of normal pregnant women.
    Author: Yoshimura M, Nishikawa M, Horimoto M, Yoshikawa N, Sawaragi S, Horikoshi Y, Sawaragi I, Inada M.
    Journal: Acta Endocrinol (Copenh); 1990 Sep; 123(3):277-81. PubMed ID: 1700569.
    Abstract:
    To ascertain the thyrotropic activity of human chorionic gonadotropin in sera of normal pregnant women, we examined the adenylate cyclase activation in the cultured FRTL-5 cells by extracted hCG from 7 normal pregnant women. hCG was extracted from the sera using anti-hCG-beta subunit monoclonal antibody-coated microwells, eluted with 2 mol/l guanidine-HCl, and reconstituted with hypotonic Hanks' solution. FRTL-5 cells were precultured in 5H medium, incubated for 2 h with the serum extracts, and the cAMP released into the medium was measured. hCG levels in serum extracts ranged from 1100 to 6800 IU/l; values corresponded to 1.4-19.8% compared with those in the original serum samples. Addition of the extracts to FRTL-5 cells resulted in significant increases in the cAMP accumulation, ranging from 9.8 to 59.0 nmol/l. cAMP levels were also increased in a dose-dependent manner by adding purified hCG as well as crude hCG and hTSH to FRTL-5 cells. These findings suggest that the thyroid gland of normal pregnant women may actually be stimulated by hCG itself.
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