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[Cancer Research 59, 1120-1126, March 1, 1999]
© 1999 American Association for Cancer Research
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[Cancer Research 59, 1120-1126, March 1, 1999]
© 1999 American Association for Cancer Research

Tumor Biology

Ret-mediated Mitogenesis Requires Src Kinase Activity1

Rosa Marina Melillo, Maria Vittoria Barone, Gelsy Lupoli, Anna Maria Cirafici, Francesca Carlomagno, Roberta Visconti, Brona Matoskova, Pier Paolo Di Fiore, Giancarlo Vecchio, Alfredo Fusco and Massimo Santoro2

Centro 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 di Napoli, Università di Napoli "Federico II," 80131, Naples [R. M. M., M. V. B., G. L., A. M. C., F. C., R. V., G. V., M. S.]; IEO, European Institute of Oncology, 20141, Milan [P. P. D. F., B. M.]; Istituto di Microbiologia, Università di Bari, Bari [P. P. D. F.]; and Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia di Catanzaro, Università di Catanzaro [A. F.], Italy

The proto-oncogene RET encodes a transmembrane growth neurotrophic receptor with tyrosine kinase (TK) activity. RET mutations are associated with several human neoplastic and nonneoplastic diseases, including thyroid papillary carcinoma, multiple endocrine neoplasia type 2 syndromes, and Hirschsprung’s disease. Activation of receptor TKs results in the binding and activation of downstream signaling proteins, among which are nonreceptor TKs of the Src family. To test the involvement of c-Src in Ret-mediated signaling, we measured the levels of c-Src activity in NIH3T3 cells coexpressing Ret and the accessory GFR {alpha}-1 receptor or an epidermal growth factor receptor/Ret chimeric receptor when the cells were stimulated by glial cell line-derived neurotrophic factor or epidermal growth factor, respectively. Ret stimulation resulted in the activation of c-Src. We also measured the levels of Src kinase activity in cell lines expressing isoforms of the Ret receptor activated by different mutations. These cells showed higher Src kinase activity than the normal counterpart. Furthermore, we show that Ret is able to associate with the SH2 domain of Src in a phosphotyrosine-dependent fashion. Microinjection of a kinase inactive mutant of c-Src blocked Ret-mediated mitogenic effect. These experiments demonstrate that activated Ret is able to bind and stimulate c-Src kinase and that Src activation is essential for the mitogenic activity of Ret.




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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cancer Prevention Research
Cancer Prevention Journals Portal Cancer Reviews Online
Annual Meeting Education Book Meeting Abstracts Online
Copyright © 1999 by the American Association for Cancer Research.