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Retinoblastoma is the most common childhood tumor of the eye, arising from cells that are defective in both copies of the retinoblastoma susceptibility gene (RB1). Most retinoblastoma tumor cells eventually undergo programmed cell death (i.e., apoptosis); however, some cells can acquire the ability to metastasize and become immortal. Transfection of immortal retinoblastoma cells with DNA sequences encoding wild-type p53 protein induces cell death, suggesting that the loss of both RB1 and p53 functions may be required for cell immortalization. We have examined this possibility by characterizing the p53 protein and messenger RNA in six independently isolated, immortalized retinoblastoma cell lines.

Nuclear Exclusion of Wild-Type p53 in Immortalized Human Retinoblastoma Cells