Attenuates Inflammation in Septic Mice Mediated by Gut Microbiota.

Sepsis is a life-threatening organ dysfunction condition caused by a dysregulated host response to infection and lack of effective treatment method. Supplementation of probiotics has emerged as a potential biotherapy for inflammatory diseases in recent years, but its role in protecting viscera against the damage caused by sepsis and the underlying mechanism is poorly understood. 19 is one of the most well-studied probiotics, which is selected in this study among seven strains isolated from homemade yogurt due to its optimal ability of suppressing the inflammation response . It showed significant decrease in the expression of TNF-α, IL-1β, and IL-6 in the co-culture of 19 and LPS-treated mouse macrophage. The effect of 19 in mice and the response of mice gut microbiota were subsequently investigated. In LPS-induced septic mouse model, 19 was highly resistant to LPS and exhibited significantly decreased expressions of inflammatory factors compared to LPS-treated mice. A MiSeq-based 16S rDNA sequence analysis revealed that the decrease of gut microbial diversity in mice intraperitoneally injected with 1 mg/ml LPS were mitigated by the administration of 19. significantly decreased during the development of sepsis and rose again after supplement strain 19, while showed the opposite trend, which demonstrated these two genera were the key bacteria that may function in the mice gut microbiota for alleviation of LPS-induced inflammation reaction. To conclude, 19 may be a potential candidate for novel biotherapeutic interventions against inflammation caused by sepsis.