Functional evidence for the presence of tumor suppressor gene on chromosome 10p15 in human prostate cancers

Oncogene
H FukuharaY Murakami

Abstract

Loss of heterozygosity on chromosome 10p was observed frequently in human prostate cancers. Studies have demonstrated that the introduction of the short arm of human chromosome 10 into a human prostate cancer cell line, PPC-1, by microcell-mediated chromosome transfer (MMCT), suppressed the malignant phenotype, suggesting the presence of a prostate tumor suppressor gene(s) within a region of 17 cM at distal 10p. To narrow down the candidate region harboring the tumor suppressor gene, a series of 10p fragments were transferred into PPC-1 cells by MMCT using a panel of hamster-human hybrid cells containing various portions of 10p. Four of the six hybrid cells obtained showed decreased tumorigenicity when injected subcutaneously into athymic nude mice. Tumors developed only at six of 40 injection sites for these four hybrid cells. In contrast, the other two hybrid cells, as well as parental PPC-1 cells, were judged to be fully tumorigenic because tumors appeared at a total 26 of 32 sites for the two hybrid cells and 15 of 16 sites for PPC-1. Allelotyping of 10p combined with fluorescence in situ hybridization in these hybrid cells suggested that a prostate tumor suppressor gene was located within a fragment of approximately 1.2 Mb...Continue Reading

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