# Vine Tea (Ampelopsis grossedentata) Extract Mitigates High-Salt-Diet-Induced Hypertension by Remodeling the Gut Microbiota–Metabolite Axis in Mice

## TL;DR

Vine tea extract lowers high blood pressure caused by a high-salt diet in mice by improving gut bacteria and related metabolites.

## Contribution

This study reveals a gut microbiota-dependent mechanism by which vine tea mitigates salt-induced hypertension.

## Key findings

- VTE significantly reduced systolic blood pressure and cardiorenal injury in mice.
- VTE enriched short-chain fatty acid-producing gut microbes and suppressed harmful species.
- VTE normalized key metabolic pathways and its effects were lost with microbiota depletion.

## Abstract

Hypertension is a major global health challenge, with excessive dietary salt intake recognized as a key environmental factor contributing to its pathogenesis. However, safe and effective dietary interventions for salt-sensitive hypertension remain limited. Vine tea (Ampelopsis grossedentata), a traditional herbal tea widely consumed for centuries in southern China, has been reported to exhibit antioxidant, anti-inflammatory, and hepatoprotective activities, yet its antihypertensive efficacy and underlying mechanisms remain unclear. In this study, the chemical profile of vine tea aqueous extract (VTE) was characterized by UPLC–Q–TOF–MS, identifying dihydromyricetin, isoquercitrin, and myricetin as the predominant flavonoids. The protective effects of VTE were evaluated in C57BL/6J mice with high-salt-diet (HSD)-induced hypertension. VTE treatment significantly lowered systolic blood pressure and ameliorated cardiac and renal injury, accompanied by reduced inflammation, fibrosis, and cardiac stress-related gene expression. Gut microbiota analysis using 16S rRNA gene sequencing revealed that VTE restored microbial richness and diversity, enriching short-chain fatty acid-producing taxa while suppressing pathogenic Desulfovibrio and Ruminococcus torques. Untargeted plasma metabolomic profiling based on UPLC–Q–TOF–MS further showed that VTE normalized tryptophan, bile acid, and glycerophospholipid metabolism, decreasing the uremic toxin indoxyl sulfate while increasing tauroursodeoxycholic acid. Notably, these protective effects were abolished under antibiotic-induced microbiota depletion, confirming that VTE acts through a gut microbiota-dependent mechanism. Collectively, VTE mitigates salt-induced hypertension and cardiorenal injury by remodeling the gut microbiota–metabolite axis, supporting its potential as a natural dietary intervention for managing hypertension.