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Bone morphogenetic protein (BMP)-2, a multifunctional member of the transforming growth factor (TGF)-beta superfamily with powerful osteoinductive effects, has various biological activities in a variety of cells. We observed that BMP-2 inhibits cell proliferation in the androgen-dependent human prostate cancer cell line, LNCaP. To investigate the mechanism of inhibition of androgen-dependent growth by BMP-2, we compared the gene expression in LNCaP cells treated with dihydrotestosterone (DHT) to that of LNCaP cells treated with DHT and BMP-2, using DNA microarray analysis. Of 8,400 human genes on the gene chip, 38 genes were up-regulated by >2.0-fold and 48 genes were down-regulated by <0.5-fold by treatment with BMP-2. These genes were involved in a variety of cellular functions, including signal transduction, transcription regulation, enzymes, transporters, structural molecules and translation. RT-PCR analysis showed that CH1CL and BMX were up-regulated and DACH1 and WNT5A were down-regulated by treatment with BMP-2. Furthermore, we detected an increase of WNT5A protein in the medium by DHT and inhibition of the increase by BMP-2. In the present study, we identified several BMP-2-responsive genes in LNCaP cells. Further studies of the roles of these genes may clarify the mechanisms underlying the inhibition of cell proliferation by BMP-2 and identify better approaches for the prevention and treatment of prostate cancer.

Alteration of gene expression in response to bone morphogenetic protein-2 in androgen-dependent human prostate cancer LNCaP cells