Growth inhibiting effects of terazosin on androgen-independent prostate cancer cell lines.

Objective To study the effects of an α1-adrenoceptor antagonist, terazosin on the androgen-independent prostate cancer cell lines PC-3 and DU145. Methods Two androgen independent cell lines, PC-3 and DU145, were used to determine cell viability, colony-forming ability, as well as cell cycle distribution, after exposure to terazosin. Western blot analysis was used to determine the expression of p21 WAF1 and p27KIP1. Results This study shows that terazosin inhibits not only prostate cancer cell growth but also its colony forming ability, both of which are main targets of clinical treatment. In addition, terazosin is shown to inhibit cell growth through G1 phase cell cycle arrest and the up-regulation of p27KIP1. Conclusion This study provides evidence that the α1-adrenoceptor antagonist terazosin may have therapeutic potential in the treatment of advanced hormone refractory prostate cancer.