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Cell Growth & Differentiation Vol. 11, 517-526, October 2000
© 2000 American Association for Cancer Research


Articles

Retinoic Acid Induces Neuronal Differentiation of Embryonal Carcinoma Cells by Reducing Proteasome-dependent Proteolysis of the Cyclin-dependent Inhibitor p271

Gustavo Baldassarre, Angelo Boccia, Paola Bruni, Claudia Sandomenico, Maria Vittoria Barone, Stefano Pepe, Tiziana Angrisano, Barbara Belletti, Maria Letizia Motti, Alfredo Fusco and Giuseppe Viglietto2

Servizio Oncologia Sperimentale E, Istituto Nazionale Tumori, 80131 Naples, Italy [G. B., A. B., P. B., T. A., B. B., M. L. M., G. V.]; Cattedra Oncologia Medica, c/o Dipartimento di Oncologia ed Endocrinologia Molecolare e Clinica [C. S., S. P.] and Dipartimento di Biologia e Patologia Cellulare e Molecolare "L.Califano" [M. V. B.], Facoltà di Medicina e Chirurgia, Università di Napoli "Federico II," 80131 Naples, Italy; and Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia di Catanzaro, Università Magna Graecia, 88100 Catanzaro, Italy [A. F.]

Abstract

Retinoic acid (RA) treatment of embryonal carcinoma cell line NTERA-2 clone D1 (NT2/D1) induces growth arrest and terminal differentiation along the neuronal pathway. In the present study, we provide a functional link between RA and p27 function in the control of neuronal differentiation in NT2/D1 cells. We report that RA enhances p27 expression, which results in increased association with cyclin E/cyclin-dependent kinase 2 complexes and suppression of their activity; however, antisense clones, which have greatly reduced RA-dependent p27 inducibility (NT2-p27AS), continue to synthesize DNA and are unable to differentiate properly in response to RA as determined by lack of neurite outgrowth and by the failure to modify surface antigens. As to the mechanism involved in RA-dependent p27 up-regulation, our data support the concept that RA reduces p27 protein degradation through the ubiquitin/proteasome-dependent pathway. Taken together, these findings demonstrate that in embryonal carcinoma cells, p27 expression is required for growth arrest and proper neuronal differentiation.




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Molecular Cancer Research Cell Growth & Differentiation
Copyright © 2000 by the American Association of Cancer Research.