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Molecules. 2018 Jun 22;23(7). pii: E1511. doi: 10.3390/molecules23071511.

(-)-Epicatechin Reduces Blood Pressure and Improves Left Ventricular Function and Compliance in Deoxycorticosterone Acetate-Salt Hypertensive Rats.

Author information

1
School of Health and Biomedical Science, RMIT University, Bundoora, VIC 3083, Australia. douglas.jackson@rmit.edu.au.
2
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. douglas.jackson@rmit.edu.au.
3
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. k.connolly@cqu.edu.au.
4
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. r.j.batacan@cqu.edu.au.
5
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. k.r.ryan@cqu.edu.au.
6
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. r.vella@cqu.edu.au.
7
School of Health, Medical and Applied Sciences, CQUniversity Australia, Rockhampton, QLD 4071, Australia. a.fenning@cqu.edu.au.

Abstract

(&minus;)-Epicatechin (E) is a flavanol found in green tea and cocoa and has been shown to attenuate tumour necrosis factor alpha (TNF-&alpha;)-mediated inflammation, improve nitric oxide levels, promote endothelial nitric oxide synthase (eNOS) activation and inhibit NADPH oxidase. This study investigated the effect of 28 days of low epicatechin dosing (1 mg/kg/day) on the cardiovascular function of deoxycorticosterone acetate (DOCA)-salt hypertensive rats. Wistar rats (n = 120, 8 weeks of age) underwent uninephrectomy and were randomised into four groups (uninephrectomy (UNX), UNX + E, DOCA, DOCA + E). DOCA and DOCA + E rats received 1% NaCl drinking water along with subcutaneous injections of 25 mg deoxycorticosterone-acetate (in 0.4 mL of dimethylformamide) every fourth day. UNX + E and DOCA + E rats received 1 mg/kg/day of epicatechin by oral gavage. Single-cell micro-electrode electrophysiology, Langendorff isolated-heart assessment and isolated aorta and mesenteric organ baths were used to assess cardiovascular parameters. Serum malondialdehyde concentration was used as a marker of oxidative stress. Myocardial stiffness was increased and left ventricular compliance significantly diminished in the DOCA control group, and these changes were attenuated by epicatechin treatment (p < 0.05). Additionally, the DOCA + E rats showed significantly reduced blood pressure and malondialdehyde concentrations; however, there was no improvement in left ventricular hypertrophy, electrophysiology or vascular function. This study demonstrates the ability of epicatechin to reduce blood pressure, prevent myocardial stiffening and preserve cardiac compliance in hypertrophied DOCA-salt rat hearts.

KEYWORDS:

DOCA-salt; cardiac function; electrophysiology; epicatechin; hypertension

PMID:
29932135
DOI:
10.3390/molecules23071511
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