کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8344753 1541589 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Residual NO modulates contractile responses and membrane potential in isolated rat mesenteric arteries
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Residual NO modulates contractile responses and membrane potential in isolated rat mesenteric arteries
چکیده انگلیسی
Shear stress or vasocontriction causes endothelial nitric oxide (NO) release resulting in the regulation of vascular smooth muscle tone in small resistance arteries. Generation of NO is inhibited by nitric oxide synthase (NOS) inhibitors. In this study, we investigated the effect of residual NO, released even in the presence of NOS inhibitors, on the membrane depolarization and phenylephrine-induced contractions of smooth muscle. For this purpose, we used hydroxocobalamin (HC), an NO scavenger, in the presence of NOS inhibitiors, Nω-nitro- L-arginine (L-NA) or Nω-nitro-L-arginine methyl ester (L-NAME) in mesenteric arteries isolated from rats. Phenylephrine (0,01-10 μM), an α1-adrenoceptor agonist, led to depolarisation and concentration-dependent contraction in mesenteric arteries. The depolarisation and contractile responses were augmented by L-NA or L-NAME. Hydroxocobalamine (HC) or carboxy-PTIO (c-PTIO) also caused to further increase the membrane depolarization and contractions induced by phenylephrine in the presence of NOS inhibitors. Chemical removal of endothelium by saponin, tyrosin kinase inhibitor erbstatin A, but not calmodulin inhibitor calmidazolium inhibited the additional membrane depolarisation and contractile responses induced by L-NA or L-NAME and L-NA or L-NAME plus HC. These findings show that residual NO modulates the contractile responses in isolated rat mesenteric arteries by exerting a tonic inhibitor effect on the depolarization and vasoconstriction induced by phenylephrine.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nitric Oxide - Volume 71, 1 December 2017, Pages 21-26
نویسندگان
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