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The cumulative concentration-response curves to them against ��1-adrenceptor agonist phenylephrine-induced contraction in BPH rat isolated prostate are shown in Figure?2f. They showed 74.59?��?5.19%, 69.24?��?4.47%, 49.49?��?5.06%, 57.95?��?6.02% and 64.16?��?2.04% relaxation activity at 10?��mol/L compared with the non-treatment group (P? http://www.selleckchem.com/products/bay-57-1293.html were significantly increased in the testosterone-treated group (Fig.?3a�Cc). P-ERK, p-MEK and Rho kinase-II activation were decreased in the KMUP-1 (2.5, 5?mg/kg/day) with testosterone group, sildenafil (5?mg/kg/day) with testosterone group and doxazosin (5?mg/kg/day) with testosterone group, respectively. In particular, KMUP-1 sharply reduced p-ERK (Fig.?3b). The protein expression of sGC��1 was significantly inhibited in the testosterone-treated prostates (Fig.?3d). The KMUP-1 (2.5, 5?mg/kg/day) with testosterone group, sildenafil (5?mg/kg/day) with testosterone group and doxazosin http://www.selleckchem.com/products/gsk2126458.html (5?mg/kg/day) with testosterone group all reversed the decreased sGC��1 in testosterone-treated prostates; sGC��1 and PKG expression were also increased in testosterone-treated prostates (Fig.?3e,g). Figure?3f shows that PDE-5A was increased in the testosterone-treated prostates, but inhibited by treatment with KMUP-1 (5?mg/kg/day) and sildenafil (5?mg/kg/day), respectively. Testosterone can significantly elevate intracellular Ca2+ by noradrenaline and phenylephrine.[11, 12] In addition, DHT, the metabolite of testosterone, enhances norepinephrine-induced cardiac hypertrophy.[22] KMUP-1 not only inhibits LNCaP cells growth,[18] but also testosterone- and DHT-sensitized contraction of http://www.selleck.cn/products/CAL-101.html prostate smooth muscle in the present study. MAPK cascades are involved in cell proliferation, and the MAPK signaling is associated with cancer and other diseases.[11-14] Androgen plays an important role in the progression of BPH and prostate cancer. Previous work has shown that androgen can activate or phosphorylate MAPK/ERK in neuron and Sertoli cells.[23] Besides BPH, hyperactivation of the ERK cascade is also observed in prostate cancer. In the present study, we found that testosterone activated the MAPK/ERK cascade associated with the development of BPH, and potentially expressed in prostate cancer cells. We also found that KMUP-1 inhibited the testosterone-induced increase in the prostate weight/bodyweight ratio, showing that KMUP-1 inhibited prostate cell proliferation in BPH. Many studies have shown that ��1-adrenoceptor blockers, including doxazosin, can inhibit cell growth through an ��1-adrenoceptor signaling independent pathway in the prostate. The current study showed that doxazosin and KMUP-1 can attenuate phosphorylation or activity of MEK and ERK. Drugs targeting the MAPK/ERK phosphorylation pathway could be an alternative treatment for BPH by inhibiting cell proliferation in the prostate.