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Isosorbide dinitrate

二硝酸異山梨醇酯
Mechanism of action:
Isosorbide dinitrate 是一種有機硝酸鹽類血管擴張劑(organic nitrate vasodilator)。Isosorbide dinitrate 進入體內後會代謝成 isosorbide mononitrate,在血管平滑肌中經酵素轉化釋放一氧化氮(NO)。一氧化氮會刺激可溶性鳥苷酸環化酶(guanylate cyclase),使 cGMP 濃度上升。cGMP 促進肌球蛋白輕鏈去磷酸化,降低鈣離子對收縮蛋白的作用,導致血管平滑肌放鬆。隨後靜脈擴張,降低回心血量,降低心室壁張力與心肌耗氧量。
Reference(s):
1. Villarroya M et al. (2005). Preclinical profile of PF9404C, a nitric oxide donor with beta receptor blocking properties. Cardiovasc Drug Rev.
2. Takabuchi S et al. (2004). The inhibitory effect of sodium nitroprusside on HIF-1 activation is not dependent on nitric oxide–soluble guanylyl cyclase pathway. Biochem Biophys Res Commun.
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