Effects of organic and inorganic mercurials on thyroidal functions.

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Abstract
Acute effects of methylmercuric chloride and mercuric chloride on thyroid functions were examined. The organic mercurial concentration of 4 .times. 10-5 M inhibited Na+K+ATPase by 50% in a membrane preparation from hog thyroid, and 6 .times. 10-7 M of the inorganic mercurial showed the same extent of inhibition. The Mg2+ ATPase activity in the preparation was affected neither by CH3HgCl up to a concentration of 2 .times. 10-3 M, nor by HgCl2 up to 1 .times. 10-4 M. After an i.p. injection of 5 .mu.g mercurial/g body wt to mice daily for 2 consecutive days, the 4 h and the 24 h uptakes of 131I by the thyroids were partially reduced by both organic and inorganic mercurials. A significant reduction in percentages of labeled iodothyronines was demonstrated. Mercurial may cause a coupling defect in the synthesis of iodothyronines. Incubation of hog thyroglobulin with 8 .times. 10-3 M of methylmercuric chloride caused no observable aberration in slab disc electrophoreogram, but the protein was apparently denatured by the same concentration of mercuric chloride, suggesting that thyroglobulin may carry a large binding capacity against either mercurial, but the inorganic mercurial can be a more potent denaturant of the protein. The in vitro lysosomal hydrolysis of the mercurial-pretreated rat thyroglobulin which was labeled with 125I in vivo and fortified with the carrier hog thyroglobulin was not affected, but the direct addition of either mercurial in the medium resulted in a significant inhibition of the proteolytic action. Iodotyrosine deiodinase in the thyroid was inhibited by both mercurials in in vitro and in vivo systems. A partial reduction in the serum bound 131I-iodide in both mercurial-treated groups was observed at 4 h and 24 h after the radioiodide administration. The blood thyroxine levels estimated by radioimmunoassay were quite reduced in the inorganic mercurial-treated group and also moderately reduced in the methylmercurial-treated group, indicating that the hormone secretion was affected by mercurials.

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