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Protective Roles of γδ T Cells and Interleukin-15 in Escherichia coli Infection in Mice

机译:γδT细胞和白细胞介素15在大肠杆菌感染小鼠中的保护作用

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The number of γδ T cells in the peritoneal cavity was increased after an intraperitoneal (i.p.) infection with Escherichia coli in lipopolysaccharide (LPS)-responsive C3H/HeN mice but not in LPS-hyporesponsive C3H/HeJ mice. The γδ T cells preferentially expressed invariant Vγ6 and Vδ1 chains and proliferated to produce a large amount of gamma interferon in the presence of LPS. Mice depleted of γδ T cells by T-cell receptor δ gene mutation showed impaired resistance against E. coli as assessed by bacterial growth. Macrophages from C3H/HeN mice infected with E. coli expressed higher levels of interleukin-15 (IL-15) mRNA than those from the infected C3H/HeJ mice. Administration of anti-IL-15 monoclonal antibody inhibited, albeit partially, the appearance of γδ T cells in C3H/HeN mice after E. coli infection and diminished the host defense against the infection. These results suggest that LPS-stimulated γδ T cells play an important role in the host defense against E. coli infection and that IL-15 may be partly involved in the protection via an increase in the γδ T cells.
机译:脂多糖(LPS)响应的C3H / HeN小鼠腹腔内(ip)感染大肠埃希菌后腹膜腔γδT细胞数量增加,而低脂多糖低反应性C3H / HeJ小鼠腹膜内γδT细胞数量增加。 γδT细胞优先表达不变的Vγ6和Vδ1链,并在LPS存在下增殖以产生大量的γ干扰素。通过T细胞受体δ基因突变耗尽γδT细胞的小鼠对Eem的抵抗力减弱。通过细菌生长评估大肠杆菌。来自感染了 E的C3H / HeN小鼠的巨噬细胞。大肠杆菌表达的白细胞介素15(IL-15)mRNA水平高于感染的C3H / HeJ小鼠。抗IL-15单克隆抗体的施用尽管在一定程度上抑制了 E后C3H / HeN小鼠中γδT细胞的出现。感染,削弱了宿主抵抗感染的防御能力。这些结果表明,LPS刺激的γδT细胞在宿主防御 E中起着重要作用。感染以及IL-15可能通过增加γδT细胞而部分参与了保护工作。

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