Department of Biochemistry, WHO Immunology Research and Training Center, University of Lausannne, Epalinges, Switzerland.
PLoS Pathog. 2010 Feb 5;6(2):e1000755. doi: 10.1371/journal.ppat.1000755.
Neutrophils are rapidly and massively recruited to sites of microbial infection, where they can influence the recruitment of dendritic cells. Here, we have analyzed the role of neutrophil released chemokines in the early recruitment of dendritic cells (DCs) in an experimental model of Leishmania major infection. We show in vitro, as well as during infection, that the parasite induced the expression of CCL3 selectively in neutrophils from L. major resistant mice. Neutrophil-secreted CCL3 was critical in chemotaxis of immature DCs, an effect lost upon CCL3 neutralisation. Depletion of neutrophils prior to infection, as well as pharmacological or genetic inhibition of CCL3, resulted in a significant decrease in DC recruitment at the site of parasite inoculation. Decreased DC recruitment in CCL3(-/-) mice was corrected by the transfer of wild type neutrophils at the time of infection. The early release of CCL3 by neutrophils was further shown to have a transient impact on the development of a protective immune response. Altogether, we identified a novel role for neutrophil-secreted CCL3 in the first wave of DC recruitment to the site of infection with L. major, suggesting that the selective release of neutrophil-secreted chemokines may regulate the development of immune response to pathogens.
中性粒细胞迅速大量募集到微生物感染部位,在该处可影响树突状细胞(DC)的募集。在此,我们分析了在利什曼原虫感染的实验模型中,中性粒细胞释放的趋化因子在早期树突状细胞(DC)募集中的作用。我们体外实验以及感染过程中发现,寄生虫诱导抵抗型利什曼原虫小鼠中性粒细胞选择性表达 CCL3。中性粒细胞分泌的 CCL3 对未成熟 DC 的趋化作用至关重要,而中和 CCL3 后该作用消失。在感染前耗尽中性粒细胞,或使用趋化因子 CCL3 的药理学或基因抑制剂,均可导致寄生虫接种部位 DC 募集显著减少。CCL3(-/-) 小鼠中 DC 募集减少可通过在感染时转移野生型中性粒细胞来纠正。中性粒细胞早期释放的 CCL3 对保护性免疫反应的发展也有短暂影响。总之,我们发现中性粒细胞分泌的 CCL3 在利什曼原虫感染部位的初始 DC 募集中具有新的作用,表明中性粒细胞分泌的趋化因子的选择性释放可能调节对病原体的免疫反应的发展。
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