首页> 外文期刊>Journal of Neuroimmunology: Official Bulletin of the Research Committee on Neuroimmunology of the World Federation of Neurology >Differential and time-dependent expression of monocyte chemoattractant protein-1 mRNA by astrocytes and macrophages in rat brain: effects of ischemia and peripheral lipopolysaccharide administration.
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Differential and time-dependent expression of monocyte chemoattractant protein-1 mRNA by astrocytes and macrophages in rat brain: effects of ischemia and peripheral lipopolysaccharide administration.

机译:星形胶质细胞和巨噬细胞在大鼠脑中单核细胞趋化蛋白-1 mRNA的差异和时间依赖性表达:缺血和外周脂多糖给药的影响。

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Increasing evidence indicates a key role of chemoattractant cytokines in the accumulation of leukocytes in the central nervous system (CNS) during the course of inflammatory processes. Monocyte chemoattractant protein (MCP-1/JE), a member of the beta-chemokine (C-C chemokine) family, functions as a potent chemoattractant and activator for monocytes. We have investigated the induction of MCP-1 mRNA using in situ hybridization histochemistry (ISH) and characterized its cellular source by combination of ISH and immunocytochemistry in ischemic rat brains as well as in brains of endotoxin-treated rats. Our results show that 6 h-2 d after middle cerebral artery occlusion (MCAO), MCP-1 mRNA is present in astrocytes surrounding the ischemic tissue (penumbra). At later time points (after 4 d), MCP-1 mRNA is found in macrophages and reactive microglia in the infarcted tissue. Peripheral administration of the bacterial lipopolysaccharide (LPS) induced MCP-1 mRNA throughout the brain in a time-dependent manner (1 h-1 d, peak of expression 6-8 h) and was found in astrocytes. In summary, we have found expression of MCP-1 in (a) astrocytes and to a lesser extent in macrophages/reactive microglia after MCA-occlusion and in (b) astrocytes after peripheral administration of LPS. These findings support that MCP-1 is involved in the CNS response to acute trauma or infection and thus may play a key role in inflammatory processes of the brain.
机译:越来越多的证据表明,在炎症过程中,趋化性细胞因子在中枢神经系统(CNS)中白细胞的积累中起着关键作用。单核细胞趋化蛋白(MCP-1 / JE)是β-趋化因子(C-C趋化因子)家族的成员,具有强大的单核细胞趋化因子和激活剂的功能。我们已经研究了使用原位杂交组织化学(ISH)诱导MCP-1 mRNA的情况,并通过ISH和免疫细胞化学的结合对MCP-1 mRNA的细胞来源进行了表征,结果表明它在缺血大鼠脑以及经内毒素处理的大鼠脑中均有效。我们的研究结果表明,大脑中动脉闭塞(MCAO)后6 h-2 d,MCP-1 mRNA存在于缺血组织(半影)周围的星形胶质细胞中。在稍后的时间点(4天后),在梗死组织的巨噬细胞和反应性小胶质细胞中发现了MCP-1 mRNA。细菌脂多糖(LPS)的外周给药以时间依赖性方式(1 h-1 d,表达峰值6-8 h)在整个大脑中诱导了MCP-1 mRNA,并在星形胶质细胞中发现。总之,我们发现MCP-1在MCA闭塞后(a)星形胶质细胞和巨噬细胞/反应性小胶质细胞中以及在LPS外周给药后(b)星形胶质细胞中表达较低。这些发现支持MCP-1参与了CNS对急性创伤或感染的反应,因此可能在脑部炎症过程中起关键作用。

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