Butyric Acid, a Gut Bacteria Metabolite, Lowers Arterial Blood Pressure Via Colon-vagus Nerve Signaling and GPR41/43 Receptors

Overview

Journal Pflugers Arch

Specialty Physiology

Date 2019 Nov 16

PMID 31728701

Citations 71

Authors

Maksymilian Onyszkiewicz

Marta Gawrys-Kopczynska

Piotr Konopelski

Marta Aleksandrowicz

Aneta Sawicka

Ewa Kozniewska

Emilia Samborowska

Marcin Ufnal

Affiliations

Soon will be listed here.

Abstract

Butyric acid (BA) is a short-chain fatty acid (SCFA) produced by gut bacteria in the colon. We hypothesized that colon-derived BA may affect hemodynamics. Arterial blood pressure (BP) and heart rate (HR) were recorded in anesthetized, male, 14-week-old Wistar rats. A vehicle, BA, or 3-hydroxybutyrate, an antagonist of SCFA receptors GPR41/43 (ANT) were administered intravenously (IV) or into the colon (IC). Reactivity of mesenteric (MA) and gracilis muscle (GMA) arteries was tested ex vivo. The concentration of BA in stools, urine, portal, and systemic blood was measured with liquid chromatography coupled with mass spectrometry. BA administered IV decreased BP with no significant effect on HR. The ANT reduced, whereas L-NAME, a nitric oxide synthase inhibitor, did not affect the hypotensive effect of BA. In comparison to BA administered intravenously, BA administered into the colon produced a significantly longer decrease in BP and a decrease in HR, which was associated with a 2-3-fold increase in BA colon content. Subphrenic vagotomy and IC pretreatment with the ANT significantly reduced the hypotensive effect. Ex vivo, BA dilated MA and GMA. In conclusion, an increase in the concentration of BA in the colon produces a significant hypotensive effect which depends on the afferent colonic vagus nerve signaling and GPR41/43 receptors. BA seems to be one of mediators between gut microbiota and the circulatory system.

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