High salt intake damages the heart through activation of cardiac (Pro) renin receptors even at an early stage of hypertension

16Citations
Citations of this article
24Readers
Mendeley users who have this article in their library.

Abstract

Objective It has not yet been fully elucidated whether cardiac tissue levels of prorenin, renin and (P) RR are activated in hypertension with a high salt intake. We hypothesized that a high salt intake activates the cardiac tissue renin angiotensin system and prorenin-(pro)renin receptor system, and damages the heart at an early stage of hypertension. Methods Wistar Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) received regular (nor-mal-salt diet, 0.9%) and high-salt (8.9%) chow for 6 weeks from 6 to 12 weeks of age. The systolic blood pressure, plasma renin activity (PRA) and plasma angiotensin II concentration were measured, and the protein expressions of prorenin, (pro)renin receptor, angiotensinogen, angiotensin II AT1 receptor, ERK1/2, TGF-β, p38MAPK and HSP27 in the myocardium were investigated. The cardiac function was assessed by echocardiography, and histological analysis of the myocardium was performed. Results The high-salt diet significantly increased the systolic blood pressure, and significantly reduced the PRA and plasma angiotensin II concentration both in the WKYs and SHRs. Cardiac expressions of prorenin, renin, (P)RR, angiotensinogen, angiotensin II AT1 receptor, phosphorylated (p)-ERK1/2, p-p38MAPK, TGF- β and p-HSP27 were significantly increased by the high salt diet both in the WKYs and SHRs. The high-salt diet significantly increased the interventricular septum thickness and cardiomyocyte size, and accelerated cardiac interstitial and perivascular fibrosis both in the WKYs and SHRs. On the other hand, dilatation of left ventricular end-diastolic dimension and impairment of left ventricular fractional shortening was shown only in salt loaded SHRs. Conclusion The high-salt diet markedly accelerated cardiac damage through the stimulation of cardiac (P)RR and angiotensin II AT1 receptor by increasing tissue prorenin, renin and angiotensinogen and the activation of ERK1/2, TGF-β, p38MAPK and HSP27 under higher blood pressure.

Cite

CITATION STYLE

APA

Hayakawa, Y., Aoyama, T., Yokoyama, C., Okamoto, C., Komaki, H., Minatoguchi, S., … Minatoguchi, S. (2015). High salt intake damages the heart through activation of cardiac (Pro) renin receptors even at an early stage of hypertension. PLoS ONE, 10(3). https://doi.org/10.1371/journal.pone.0120453

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free