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  • Title: The human Y chromosome suppresses the tumorigenicity of PC-3, a human prostate cancer cell line, in athymic nude mice.
    Author: Vijayakumar S, Garcia D, Hensel CH, Banerjee M, Bracht T, Xiang R, Kagan J, Naylor SL.
    Journal: Genes Chromosomes Cancer; 2005 Dec; 44(4):365-72. PubMed ID: 16080199.
    Abstract:
    The loss of the Y chromosome is a frequent numerical chromosomal abnormality observed in human prostate cancer. In cancer, loss of specific genetic material frequently accompanies simultaneous inactivation of tumor suppressor genes. It is not known whether the Y chromosome harbors such genes. To address the role of genes on the Y chromosome in human prostate cancer, we transferred a tagged Y chromosome into PC-3, a human prostate cancer cell line lacking a Y chromosome. A human Y chromosome was tagged with the hisD gene and transferred to PC-3 by microcell-mediated chromosome transfer. Tumorigenicity of these PC-3 hybrids was tested in vivo and in vitro, and the results were compared with those of the polymerase chain reaction analyses conducted on the PC-3 hybrids using Y chromosome-specific markers. Among 60 mice injected with 12 different PC-3 hybrids (five mice per hybrid), tumor growth was apparent in only one mouse, whereas tumors grew in all mice injected with the parental PC-3 cells. An in vitro assay showed that the Y chromosome did not suppress anchorage-independent growth of PC-3 cells. We found that addition of the Y chromosome suppressed tumor formation by PC-3 in athymic nude mice, and that this block of tumorigenesis was independent of the in vitro growth properties of the cells. This observation suggests the presence of a gene important for prostate tumorigenesis on the Y chromosome.
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