A specific microbial consortium enhances Th1 immunity, improves LCMV viral clearance but aggravates LCMV disease pathology in mice

Anti-viral immunity can vary tremendously from individual to individual but mechanistic understanding is still scarce. Here, we show that a defined, low complex bacterial community (OMM(12)) but not the general absence of microbes in germ-free mice leads to a more potent immune response compared to the microbiome of specific-pathogen-free (SPF) mice after a systemic viral infection with LCMV Clone-13. Consequently, gnotobiotic mice colonized with OMM(12) have more severe LCMV-induced disease pathology but also enhance viral clearance in the intestinal tract. Mechanistically, single-cell RNA sequencing analysis of adoptively transferred virus-specific T helper cells and endogenous T helper cells in the intestinal tract reveal a stronger pro-inflammatory Th1 profile and a more vigorous expansion in OMM(12) than SPF mice. Altogether, our work highlights the causative function of the intestinal microbiome for shaping adaptive anti-viral immunity with implications for vaccination strategies and anti-cancer treatment regimens.

• Kolland, D.
• Kuhlmann, M.
• de Almeida, G. P.
• Köhler, A.
• Arifovic, A.
• von Strempel, A.
• Pourjam, M.
• Bolsega, S.
• Wurmser, C.
• Steiger, K.
• Basic, M.
• Neuhaus, K.
• Schmidt-Weber, C. B.
• Stecher, B.
• Zehn, D.
• Ohnmacht, C.