Nature Medicine
3, 913 - 916 (1997)
doi:10.1038/nm0897-913
The retinoblastoma gene family pRb/p105, p107, pRb2/p130 and simian virus-40 large T-antigen in human mesotheliomasAntonio De Luca1, *, Alfonso Baldi1, *, Vincenzo Esposito1, 2, *, Candace M. Howard1, Luigi Bagella1, Paoloa Rizzo3, Mario Caputi2, Harvey I. Pass4, Giovan Giacomo Giordano5, Feliciano Baldi5, Michele Carbone3
& Antonio Giordano1, 6
1Department of Pathology, Anatomy & Cell Biology and Sbarro Institute for Cancer Research and Molecular Medicine, Jefferson Medical College, 1020 Locust Street, Philadelphia Pennsylvania 19107, USA
2Istituto di Tisiologia e Malattie Respiratorie "S. Marcatili," Facoltà di Medicina, II Università di Napoli, Via L. Bianchi, Napoli 80122, Italy
3Cardinal Bemardin Cancer Center, Cancer Immunology Program, Department of Pathology, Loyola University, 2160 South First Avenue, Chicago, Maywood, Illinois 60153, USA
4Karmanos Cancer Institute, Wayne State University, 3990 John Road, Detroit, Michigan 48201, USA
5Istituto di Anatomia Patologica, Facoltà di Medicina, II Università di Napoli, Via L. Armanni, Napoli 80122, Italy
6Correspondence should be addressed to A.G.
*The first three authors contributed equally to this work The oncoprotein of simian virus-40, SV40 large T-antigen (Tag), is reported to target and to inactivate growth suppressive proteins such as the retinoblastoma family1−3 and p53 (ref. 4, 5), leading to transformation of human cell lines in vitro, tumor production in rodents6, and detection of Tag in several human cancers including mesotheliomas7,8. The retinoblastoma family contains three members, pRb, p107 and pRb2/p130 (ref. 9), that are phosphorylated in a cell cycle-dependent manner10,11, have cell growth suppressive properties12 and bind to specific members of the E2F family and various cyclins13. Even though mesotheliomas are among the most aggressive human cancers, alterations of important cell-cycle "controllers," such as the Rb family genes, have never been reported in these tumors. We found the presence of SV40-like sequences in 86% of 35 archival specimens of mesothelioma. We also demonstrated that SV40 Tag, isolated from frozen biopsies of human mesothelioma, binds each of the retinoblastoma family proteins, pRb, p107 and pRb2/p130, in four of four specimens. We propose that the tumorigenic potential of SV40 Tag in some human mesotheliomas may arise from its ability to interact with and thereby inactivate several tumor and/or growth suppressive proteins.
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