Winquist R J, Faison E P, Waldman S A, Schwartz K, Murad F, Rapoport R M
Proc Natl Acad Sci U S A. 1984 Dec;81(23):7661-4. doi: 10.1073/pnas.81.23.7661.
A 26 amino acid synthetic peptide fragment of atrial natriuretic factor (ANF) relaxed isolated rabbit aortic segments in which the endothelium was either intact or functionally destroyed. The relaxations were temporally associated with increases in levels of cGMP with no change in the levels of cAMP. The ANF-induced increases in cGMP were also observed in aortic segments pretreated with calcium-free buffer or the cGMP phosphodiesterase inhibitor M&B 22,948. Qualitatively similar results were obtained for sodium nitroprusside. ANF selectively activated particulate guanylate cyclase, having no effect on the soluble form of the enzyme. Thus, the direct (endothelium-independent) vasodilator effect of ANF may be mediated via increased tissue levels of cGMP. ANF appears to increase vascular cGMP levels by activation of particulate guanylate cyclase.
心房利钠因子(ANF)的一个26个氨基酸的合成肽片段可使内皮完整或功能受损的离体兔主动脉段舒张。这种舒张在时间上与cGMP水平升高相关,而cAMP水平无变化。在用无钙缓冲液或cGMP磷酸二酯酶抑制剂M&B 22,948预处理的主动脉段中也观察到ANF诱导的cGMP升高。硝普钠也得到了定性相似的结果。ANF选择性激活颗粒型鸟苷酸环化酶,对该酶的可溶性形式无影响。因此,ANF的直接(不依赖内皮)血管舒张作用可能是通过增加组织cGMP水平介导的。ANF似乎通过激活颗粒型鸟苷酸环化酶来增加血管cGMP水平。