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From the Istituto di Endocrinologia ed Oncologia Sperimentale del Consiglio Nazionale Delle Ricerche c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare,* Facoltà di Medicina e Chirurgia, Università di Napoli "Federico II", Naples, Italy; the Istituto Nazionale dei Tumori, Fondazione Senatore Pascale, Napoli, Italy; the Dipartimento di Scienze Biologiche ed Ambientali, Università del Sannio, Benevento, Italy; Anatomia Patologica,|| Ospedale Bellaria, Facoltà di Medicina e Chirurgia, Università di Bologna, Bologna, Italy; the Department of Internal Medicine, Franklin Square Hospital Center, Baltimore Maryland; and the Department of Pathology,¶ Yale University School of Medicine, New Haven, Connecticut
Activating germ-line point mutations in the RET receptor are responsible for multiple endocrine neoplasia type 2-associated medullary thyroid carcinoma (MTC), whereas somatic RET rearrangements are prevalent in papillary thyroid carcinomas (PTCs). Some rare kindreds, carrying point mutations in RET, are affected by both cancer types, suggesting that, under specific circumstances, point mutations in RET can drive the generation of PTC. Here we describe a family whose siblings, affected by both PTC and MTC, carried a germ-line point mutation in the RET extracellular domain, converting cysteine 634 into serine. We tested on thyroid follicular cells the transforming activity of RET(C634S), RET(K603Q), another mutant identified in a kindred with both PTC and MTC, RET(C634R) a commonly isolated allele in MEN2A, RET(M918T) responsible for MEN2B and also identified in kindreds with both PTC and MTC, and RET/PTC1 the rearranged oncogene that characterizes bona fide PTC in patients without MTC. We show that the various RET point mutants, but not wild-type RET, scored constitutive kinase activity and exerted mitogenic effects for thyroid PC Cl 3 cells, albeit at significantly lower levels compared to RET/PTC1. The low mitogenic activity of RET point mutants paralleled their reduced kinase activity compared to RET/PTC. Furthermore, RET point mutants maintained a protein domain, the intracellular juxtamembrane domain, that exerted negative effects on the mitogenic activity. In conclusion, RET point mutants can behave as dominant oncogenes for thyroid follicular cells. Their transforming activity, however, is rather modest, providing a possible explanation for the rare association of MTC with PTC.
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