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西地那非的中枢神经系统作用 被引量:2

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摘要 西地那非是一种高度选择性磷酸二酯酶5(PDE5)抑制剂,目前主要应用于治疗男性勃起功能障碍.PDE5在阴茎海绵体中高度表达,西地那非通过选择性抑制PDE5,增强一氧化氮(NO)-环磷酸鸟苷(cGMP)途径,升高cGMP水平而导致阴茎海绵体平滑肌松弛,使勃起功能障碍患者对性刺激产生自然的勃起反应.PDEs具有水解细胞内第二信使环磷酸腺苷(cAMP)或cGMP的功能,降解细胞内cAMP或cGMP,从而终结这些第二信使所传导的生化作用.PDEs有11个亚型分布于身体的各个部位,PDE5能够特异性调节细胞内cGMP水平,其主要分布在肺、血小板、各种平滑肌和几个脑区.
出处 《中华临床医师杂志(电子版)》 CAS 2012年第10期140-141,共2页 Chinese Journal of Clinicians(Electronic Edition)
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