Potential Probiotic Properties of Blautia producta Against Lipopolysaccharide-Induced Acute Liver Injury.

Abstract

Blautia is a genus of anaerobic microbe extensively present in the intestine and feces of mammals. This study aims to investigate the influence of Blautia producta to prevent lipopolysaccharide (LPS)-induced acute liver injury (ALI) and elaborate on its hepatoprotective mechanisms. B. producta D4 and DSM2950 pretreatment decreased the activities of serum aspartate transferase (AST), and alanine transaminase (ALT) in mice with LPS treatment significantly decreased the levels of inflammatory tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-6) and increased the activities of antioxidative superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px). Compared with the model group, B. producta D4 and B. producta DSM2950 pretreatment slightly increased the levels of cecal propionic acid, isobutyric acid, butyric acid, valeric acid, and isovaleric acid (p > 0.05). Metagenomic analysis showed that B. producta D4 and DSM2950 pretreatment remarkably increased the relative abundance of [Eubacterium] xylanophilum group, Lachnospira, Ruminiclostridium, Ruminiclostridium 9, Coprococcus 2, Odoribacter, Roseburia, Alistipes, and Desulfovibrio in ALI mice, and their abundance is negatively related to the levels of inflammatory TNF-α, IL-1β, and IL-6 as revealed by Spearman's correlation analysis. Moreover, transcription and immunohistochemistry analysis revealed that B. producta D4 and B. producta DSM2950 intervention remarkably suppressed the transcription and expression levels of hepatic Tlr4, MyD88, and caspase-3 (p < 0.05). These data indicated that B. producta may be a good candidate for probiotics in the prevention of ALI.