# The probiotic Limosilactobacillus fermentum CECT5716 enhances the antihypertensive response to hydrochlorothiazide in spontaneously hypertensive rats

## TL;DR

A probiotic called LC40 improves the blood pressure-lowering effects of a diuretic drug in rats without causing side effects.

## Contribution

The study shows that combining a probiotic with a diuretic enhances antihypertensive effects through gut microbiota modulation.

## Key findings

- LC40 combined with HCTZ improved endothelial dysfunction and reduced blood pressure in hypertensive rats.
- LC40 normalized gut microbiota changes and reduced lipopolysaccharide biosynthesis and intestinal endotoxemia.
- Fecal microbiota transplantation replicated LC40's benefits, showing microbiota-dependent effects on hypertension.

## Abstract

Limosilactobacillus fermentum CECT5716 (LC40) consumption reduces hypertension and improves endothelial dysfunction in spontaneously hypertensive rats (SHRs). The diuretic hydrochlorothiazide (HCTZ) lowers blood pressure in SHR but disrupts the gut microbiota balance. In this study, we investigated whether the LC40 could enhance the antihypertensive effects of HCTZ. Interestingly, we found that coadministration of LC40 with HCTZ potentiated the beneficial effects of HCTZ on endothelial dysfunction and blood pressure without altering plasma HCTZ concentrations or exacerbating electrolyte imbalances. These protective effects were associated with normalization of microbiota alterations, including a reduction in the Firmicutes/Bacteroidota ratio, suppression of lipopolysaccharide biosynthesis, and an increase in acetate-producing bacteria. Additionally, LC40 reduced intestinal pathology and endotoxemia. Furthermore, the HCTZ + LC40-treated rats exhibited reduced neuroinflammation and sympathetic activity, along with an immunoregulatory effect characterized by increased regulatory T cell infiltration and a reduction of vascular oxidative stress in the aorta. The beneficial effects of LC40 in HCTZ-treated rats appeared to be microbiota dependent, as they were replicated through fecal microbiota transplantation in germ-depleted normotensive rats. Our findings identify the gut microbiota as a novel therapeutic target to enhance the antihypertensive effects of diuretics. The coadministration of LC40 with HCTZ modulates immune responses, providing a promising strategy to improve hypertension management.