Mutnal Manohar B, Cheeran Maxim C-J, Hu Shuxian, Little Morgan R, Lokensgard James R
Neuroimmunology Laboratory, Center for Infectious Diseases and Microbiology Translational Research, University of Minnesota Medical School, Minneapolis, MN 55455, USA.
J Neuroimmunol. 2010 Oct 8;227(1-2):101-10. doi: 10.1016/j.jneuroim.2010.06.020. Epub 2010 Jul 24.
Wild-type mice control murine cytomegalovirus (MCMV) brain infection, but identical infection is lethal to animals deficient in interleukin (IL)-10. Here, we report that MCMV-infected IL-10 knockout (KO) mice displayed a marked increase in neutrophil infiltration into the infected, IL-10-deficient brain when compared to wild-type animals. Enhanced microglial cell activation, determined by MHC class II up-regulation, overexpression of CXCL2, and elevated P-selectin mRNA levels were observed. In vivo blocking of CXCL2 attenuated neutrophil infiltration and significantly improved the outcome of infection. Collectively, these data indicate that the absence of IL-10 results in pathologic neutrophil infiltration into MCMV-infected brains.
野生型小鼠能够控制鼠巨细胞病毒(MCMV)引起的脑部感染,但相同的感染对白细胞介素(IL)-10缺陷的动物却是致命的。在此,我们报告称,与野生型动物相比,感染MCMV的IL-10基因敲除(KO)小鼠的感染脑内中性粒细胞浸润显著增加。通过MHC II类分子上调、CXCL2过表达以及P-选择素mRNA水平升高确定,小胶质细胞活化增强。体内阻断CXCL2可减轻中性粒细胞浸润,并显著改善感染结果。总体而言,这些数据表明,IL-10的缺失导致病理性中性粒细胞浸润到感染MCMV的脑内。