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• W2003762787 abstract "We evaluated the vasorelaxation effects of formononetin, an isoflavone/phytoestrogen found abundantly in Astragalus mongholicus Bunge, on rat isolated aorta and the underlying mechanisms involved. Cumulative administration of formononetin, genistein, daidzein and biochanin A relaxed phenylephrine-preconstricted aorta. Formononetin and biochanin A caused a similar magnitude of relaxation whereas daidzein was least potent. Mechanical removal of endothelium, L-NAME (100 μM) and methylene blue (10 μM) suppressed formononetin-induced relaxation. Formononetin increased endothelial nitric oxide (NO) synthase (eNOS), but not inducible NO synthase, activity with an up-regulation of eNOS mRNA and p-eNOSSer1177 protein expression. In endothelium-denuded preparations, formononetin-induced vasorelaxation was significantly reduced by glibenclamide (3 μM) and iberiotoxin (100 nM), and a combination of glibenclamide (3 μM) plus iberiotoxin (100 nM) abolished the relaxation. In contrast, formononetin-elicited endothelium-independent relaxation was not altered by ICI 182,780 (10 μM, an estrogen receptor (ERα/ERβ) antagonist) or mifepristone (10 μM, a progesterone receptor antagonist). In single aortic smooth muscle cells, formononetin caused opening of iberiotoxin-sensitive Ca2+-activated K+ (BKCa) channels and glibenclamide-sensitive adenosine triphosphate (ATP)-dependent K+ (KATP) channels. Thus, our results suggest that formononetin caused vascular relaxation via endothelium/NO-dependent mechanism and endothelium-independent mechanism which involves the activation of BKCa and KATP channels." @default.
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• W2003762787 date "2010-07-01" @default.
• W2003762787 modified "2023-10-01" @default.
• W2003762787 title "Formononetin, an isoflavone, relaxes rat isolated aorta through endothelium-dependent and endothelium-independent pathways" @default.
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• W2003762787 doi "https://doi.org/10.1016/j.jnutbio.2009.03.010" @default.
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