Suppression of metastasis of rat prostate cancer by introduction of human chromosome 13.

Aim: Chromosome 13 is one of the most frequently altered chromosomes in prostate cancer. The present study was undertaken to examine the role of human chromosome 13 in the progression of prostate cancer. Methods: Human chromosome 13 was introduced into highly metastatic rat prostate cancer cells via microcell-mediated chromosome transfer. Results: Microcell hybrid clones containing human chromosome 13 showed suppression of metastasis to the lung without any suppression of tumorigenicity, except for one clone, which contained the smallest sized human chromosome 13 and did not show any suppression on lung metastasis. Expression of two known tumor suppressor genes, BRCA2 and RB1, which map to chromosome 13, was examined by reverse transcription- polymerase chain reaction analysis. BRCA2 was expressed only in the metastasis-suppressed microcell-hybrid clones, whereas RB1 was expressed in all clones. Conclusion: Human chromosome 13 contains metastasis suppressor gene (s) for prostate cancer derived from rat. Furthermore, the RB1 gene is unlikely to be involved in the suppression of metastasis evident in this system.