Distribution and temporal regulation of the immune response in the rat brain to intracerebroventricular injection of interferon-γ

被引:22
作者
Peng, ZC [1 ]
Kristensson, K
Bentivoglio, M
机构
[1] Univ Verona, Fac Med, Inst Anat & Histol, I-37100 Verona, Italy
[2] Karolinska Inst, Dept Neurosci, Stockholm, Sweden
关键词
microglia; major histocompatibility complex; CD4+ T cells; CD8+ T cells; cytokines; periventricular brain regions; white matter;
D O I
10.1006/exnr.1998.6943
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The response to intracerebroventricular administration of interferon (IFN)-gamma was examined in the adult Wistar rat brain: major histocompatibility complex (MHC) antigens class I and II, CD8 and CD4 antigens, and the macrophage/microglia antigen OX42 were analyzed in respect to saline-injected cases over 1 week. The glial cell type expressing MHC antigens was characterized with double labeling. IFN-gamma was thus found to induce MHC class I and II expression in microglia, identified by tomato lectin histochemistry, and not in GFAP-immunostained astrocytes. MHC antigen-expressing microglia was detected in the periventricular parenchyma, several fields of the cerebral cortex, cerebellum, major fiber tracts, and brainstem superficial parenchyma. Different gradients of density and staining intensity of the MHC-immunopositive elements were observed in these regions, in which MHC class I antigens persisted up to 1 week, when MHC class II induction had declined. Quantitative analysis pointed out the proliferation of OX42-immunoreactive cells in periventricular and basal brain regions. CD8+ T cells were observed in periventricular regions, basal forebrain, and fiber tracts 3 days after IFN-gamma injection and their density markedly increased by 7 days. CD4+ T cells were also seen and they were fewer than CD8+ ones. However, numerous CD4+ microglial cells were observed in periventricular and subpial regions, especially 1 week after IFN-gamma injection. Our data indicate that this proinflammatory cytokine mediates in vivo microglia activation and T cell infiltration in the brain and that the cells involved in this immune response display a regional selectivity and a different temporal regulation of antigen expression. (C) 1998 Academic Press.
引用
收藏
页码:403 / 417
页数:15
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