PMID: 9192669Jun 24, 1997Paper

Loss of the retinoblastoma protein-related p130 protein in small cell lung carcinoma

Proceedings of the National Academy of Sciences of the United States of America
K HelinP Norgaard

Abstract

The retinoblastoma gene family consists of the tumor suppressor protein pRB and its two relatives p107 and p130. These proteins have been implicated in the regulation of cell cycle progression, in part, through inactivation of members of the E2F transcription factor family. Overexpression of pRB, p107, or p130 leads to growth arrest in the G1 phase of the cell cycle, and this arrest is abolished by complex formation with the adenovirus E1A, human papilloma virus E7, or simian virus 40 T oncoproteins. Inactivation of pRB by gross structural alterations or point mutations in the RB-1 gene has been described in a variety of human tumors, including retinoblastomas, osteosarcomas, and small cell lung carcinomas. Despite the structural and functional similarity between pRB, p107, and p130, alterations in the latter two proteins have not been identified in human tumors. We have screened a panel of 17 small cell lung carcinoma cell lines for the presence of functional p107 and p130 by evaluating their ability to form complexes with E1A in vitro. In the GLC2 small cell lung carcinoma cells no p130 protein was detected. The loss of the p130 protein is the result of a single point mutation within a splice acceptor sequence in the GLC2 gen...Continue Reading

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