In vitro study | Besides being an alpha 1-adrenoceptor antagonist, Naftopidil diHCl also has 5-HT1A Agonistic properties. Naftopidil has a growth inhibitory effect in androgen sensitive and insensitive human prostate cancer cell lines. Naftopidil inhibited the growth of androgen-sensitive LNCaP cells and androgen-insensitive PC-3 cells with an IC50 of 22.2 μm and 33.2 μm, respectively. The inhibition of cell growth by Naftopidil is due to the arrest of the G1 cell cycle. In Naftopidil-treated cells, p27 Naftopidil significantly attenuated enuresis against collagen-induced Ca Naftopidil compared to tamsulosin. In PCa cells and prscs, Naftopidil induces G(1) cell arrest. In Naftopidil treated prscs, total interleukin-6 was significantly reduced with increased inhibition of cell proliferation. |