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Dipartimento di Scienze e Tecnologie Biomediche [D. F., R. D. L., G. D.] and Dipartimento di Scienze Mediche e Morfologiche [C. D. L., C. A. B.], Università di Udine, Ospedale Gervasutta, via Gervasutta 48 Udine, and Cattedra di Endocrinologia, Università di Catania, Catania [A. B.], Italy
TTF-1 and PAX-8 are tissue-specific transcription factors expressed in the thyroid follicular cells, contributing to the maintenance of the differentiated phenotype. In fact, it has been demonstrated that TTF-1 and PAX-8 are able to activate transcription from thyroglobulin and thyroperoxidase (TPO) promoters, the transcriptional activity of which is in vivo restricted only to the thyroid follicular cell. In order to gain insight into how these transcription factors control in vivo the differentiation of the thyroid cell and to have a better molecular characterization of human thyroid tumors, TTF-1, PAX-8, thyroglobulin, and TPO mRNA levels were measured in nonmalignant and malignant human thyroid tissues. Results indicate that the expression of TTF-1 and PAX-8 is not sufficient per se for the expression of the thyroid-differentiated phenotype. Furthermore, in follicular adenomas, PAX-8 mRNA levels are strictly related to TPO mRNA levels, suggesting that the amount of PAX-8 could play a role in the modulation of TPO gene expression. TTF-1 mRNA is always well detectable in papillary carcinomas and, in contrast, always absent in anaplastic carcinomas. Identical results were obtained when the expression of TTF-1 protein was investigated using immunohistochemistry. Thus, TTF-1 gene expression could be a molecular marker in order to distinguish these two types of thyroid neoplasms.
1 This work is funded by the Progetto Finalizzato Oncologia of the Consiglio Nazionale delle Ricerche and by the Associazione Italiana Ricerca Cancro.
2 To whom requests for reprints should be addressed.
Received 3/16/94. Accepted 7/ 6/94.
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