5q11, 8p11, and 10q22 are recurrent chromosomal breakpoints in prostate cancer cell lines

Prostate cancer cell lines have been widely used as model systems character izing pathogenetic, functional, and therapeutic aspects of prostate cancer development. However, their chromosomal compositions are poorly characteriz ed. In this study, five prostate cancer cell lines-TSU-Prl, JCA-1, NCl-H660 , ALVA-31, and PPC-1-were investigated by G-banding, comparative genomic hy bridization (CGH), and spectral karyotyping. The results were combined with our previous findings in the prostate cancer cell lines PC-3, DU145, and L NCaP. By comparative genomic hybridization (CGH), the most frequent losses were observed at 13q, 8p, 9p, and 4q, whereas gains were most commonly seen at 8q, 10q, and 18p. The composite karyotypes were characterized by multip le numerical and structural chromosomal aberrations. Recurrent breakpoints at 5q11, 8p11, and 10q22 were observed to participate in deletion and trans location events in five of the cell lines, suggesting the importance of tum or suppressor and/or oncogenes in these regions. ALVA-31 and PPC-1 shared n ine identical derivative chromosomes, two of which have also been detected in PC-3. In addition, the identification of the same homozygous deletion at D10S541 and of an identical TP53 gene mutation in all three cell lines sug gests a common origin of these cell lines. (C) 2001 Wiley-Liss, Inc.