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  • Title: Resveratrol via activation of AMPK lowers blood pressure in DOCA-salt hypertensive mice.
    Author: Sun GQ, Li YB, Du B, Meng Y.
    Journal: Clin Exp Hypertens; 2015; 37(8):616-21. PubMed ID: 26114354.
    Abstract:
    OBJECTIVE: Resveratrol, a phytoalexin, is reported to activate AMP-activated protein kinase (AMPK) in vascular cells. Activation of AMPK induces vasorelaxation to lower blood pressure (BP). Whether resveratrol via activation of AMPK decreases, BP remains unknown. METHODS: Male wild-type (WT) mice and mice deficient in AMPKα2 (AMPKα2(-/-)) were fed with resveratrol (400 mg/kg). After 7 d, mice were implanted with deoxycorticosterone acetate (DOCA)-salt (150 mg/kg) for 35 d. BP was detected by the radiotelemetry method. Vessel contraction was determined by organ chamber. Active RhoA, Rho-associated kinase (ROCK) activity, phosphorylations of myosin light chain (MLC), and myosin phosphatase targeting subunit 1 (MYPT1) were assayed by western blot. RESULTS: Implantation of DOCA-salt dramatically increased systemic BPs (systolic BP and diastolic BP) in WT and AMPKα2(-/-) mice. However, treatment of resveratrol significantly decreased systemic BP in WT mice but not in AMPKα2(-/-) mice. In the organ chamber study, resveratrol inhibited agonist-induced vessel relaxation in WT mice aortas. Loss of AMPKα2 or AMPK inhibition by compound C reversed resveratrol-suppressed vasoconstriction in isolated mice aortas. In cultured vascular smooth muscle cells (VSMCs), activation of AMPK by resveratrol inhibited phenylephrine-enhanced MLC phosphorylation in a dose-dependent manner. CONCLUSIONS: Resveratrol via activation of AMPK lowers BP in DOCA-hypertensive mice through an AMPK/RhoA/ROCK2/MLCMLC pathway.
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