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Journal of Clinical Endocrinology & Metabolism, Vol 63, 1170-1173, Copyright © 1986 by Endocrine Society

ARTICLES

Expression of the myc cellular proto-oncogene in human thyroid tissue

S Yamashita, J Ong, JA Fagin and S Melmed

The expression of cellular oncogenes was examined in human thyroid tissue. Four thyroid adenomas and three thyroid carcinomas expressed c- myc oncogene mRNA transcripts, which were not expressed in normal thyroid tissues. Agarose gel electrophoresis of poly(A) RNA extracts of adenoma tissues followed by hybridization with v-myc DNA yielded two distinct c-myc mRNA species [2.1 and 4.0 kilobases (kb)]. Thyroid cancer tissue poly(A) RNA revealed a predominant larger c-myc mRNA species (approximately 6 kb) and a smaller 2.1-kb species. After enzymatic dispersion of thyroid adenoma cells, cytoplasmic dot blot hybridization of immobilized thyroid adenoma RNA extracts with the v- myc cDNA probe showed stimulation of c-myc mRNA expression by TSH in a dose- and time-dependent manner. After 72-h pretreatment with serum- free medium, the quiescent adenoma cells yielded a negligible hybridization signal which was stimulated by TSH (10 mU/ml) after 6 h of treatment. Although normal cultured thyroid cells did not contain detectable c-myc mRNA, TSH also stimulated the myc protooncogene expression in a time-dependent manner in normal thyroid cells. These results demonstrate the expression of c-myc mRNA in human thyroid tumors and the in vitro induction of c-myc mRNA in both normal and adenoma thyroid cell cultures by TSH.


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