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Epigallocatechin-3-gallate exerts antihypertensive effects and improves endothelial function in spontaneously hypertensive rats

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Asian Pacific Journal of Tropical Biomedicine 2023年第7期13卷 287-295页

作者： yucinda yy khor Siew-Keah Lee Dharmani Devi M Wei Chih Ling Department of Pre-clinical Sciences M.Kandiah Faculty of Medicine and Health SciencesUniversiti Tunku Abdul RahmanSelangorMalaysia Department of Pharmacology Faculty of MedicineUniversiti MalayaKuala LumpurMalaysia

Objective:To investigate the effect of epigallocatechin-3-gallate(EGCG)on endothelial dysfunction in spontaneously hypertensive rats(SHR).Methods:Wistar-Kyoto(WKY)rats and SHR were divided into four groups;WKY control,SHR control and SHR treated with EGCG(50 mg/kg/day)or losartan(10 mg/kg/day).The treatment was given daily for 4 weeks by oral gavage and the blood pressure was monitored by tail-cuff method every 3 *** endothelium-dependent relaxations were assessed in isolated phenylephrine-precontracted aortic rings at the end of *** vascular levels of reactive oxygen species,nitric oxide,tetrahydrobiopterin,and cyclic guanosine monophosphate were also ***,the expression of angiotensinⅡtype 1(AT_(1))receptor protein was ***:The systolic blood pressure was significantly decreased in SHR treated with *** impaired endothelium-dependent relaxation was significantly improved in aortic ring isolated from the EGCG-treated SHR *** also significantly increased the levels of nitric oxide,tetrahydrobiopterin,and cyclic guanosine monophosphate,while decreasing the level of reactive oxygen species and the protein expression of AT_(1)receptor in ***:EGCG attenuates endothelial dysfunction in SHR by decreasing oxidative stress and increasing vascular nitric oxide bioavailability,which may be modulated partly by inhibition of vascular AT_(1)*** increase in endothelium-dependent relaxation may contribute to a decrease in blood pressure in hypertensive animals.

关键词： Epigallocatechin-3-gallate Vascular protection Antihypertension Tetrahydrobiopterin Cyclic guanosine monophosphate Angiotensin typeⅠreceptor Spontaneously hypertensive rats

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