本研究において通常環境下で飼育したSPFマウスの腸管にはインターフェロンガンマ (IFNγ)を産生するCD8T細胞が多く局在し、それが腸内細菌によって誘導されることを見出した。というのも、IFNγ産生CD8T細胞数は無菌マウスならびに抗生剤投与マウスで著しく少なく、無菌マウスにSPFマウス便の菌叢を定着させると誘導が認められる。また、マウスの飼育施設や同居実験の結果から特定の腸内細菌種がその誘導に関与することが明らかとなった。
In this study, we found that interferon-gamma; (IFNγ)-producing CD8+ T cells were highly abundant in the intestine of specific pathogen-free (SPF) mice and which were driven by microbiota. This is because IFNγ+CD8+ T cells were severly depleted in germ-free (GF) mice and SPF mice treated with antibiotics-mixture, and we could see the induction by oral inoculation of GF mice with SPF feces. Specific members of microbiota were corresponded to induce IFNγ+CD8+ T cell since the relative abundance of this cell population in SPF mice varied with housing conditions, and co-housing resulted in all mice ultimately displaying a high-frequency phenotype. Using our bacterial isolate which robustly induce IFNγ+CD8+ T cells in intestines, repetitive administrations of the mixture enhanced host resistance against Listeria monocytogenes infection.

研究種目 : 若手研究(B)
研究期間 : 2016～2018
課題番号 : 16K19165
研究分野 : 腸内細菌学, 免疫学