The CCL7-CCL2-CCR2 axis regulates IL-4 production in lungs and fungal immunity.

The CCL7-CCL2-CCR2 axis regulates IL-4 production in lungs and fungal immunity.
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DOI:
10.4049/jimmunol.0901316
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发表时间:
2009-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Deepe GS Jr
Deepe GS Jr
中科院分区:
其他
文献类型:
--
作者:
Szymczak WA;Deepe GS Jr

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趋化因子受体CCR2的表达对感染的解决是有害的,也可能是有益的。在这里,我们研究了CCR2是否是控制由二相性真菌组织胞浆体感染所必需的。被囊毛霉菌感染的−/−小鼠表现出炎症细胞募集、IL-4升高和进行性感染的缺陷。IL-4中和的CCR2−/−小鼠能够在不改变炎性细胞募集的情况下消除感染,这证明了CCR2−/−小鼠体内IL-4的增加主要是导致宿主抵抗力下降的原因。令人惊讶的是,大量的肺泡巨噬细胞和树突状细胞促进了CCR2−/−小鼠IL-4的产生。IL-4介导的−/−小鼠免疫功能受损与吞噬细胞的精氨酸酶-1和YM1转录增加以及转铁蛋白受体表达增加有关。尽管炎症细胞募集减少,但缺乏CCR2配体CCL2的小鼠的免疫力并未受到损害。在CCL2−/−小鼠中中和CCR2配体CCL7,但不是野生型,导致IL-4和真菌负荷增加。因此,CCL7和CCL2的结合限制了IL-4的产生,并控制了宿主的抗性。此外,在CCR2−/−小鼠中,吞噬细胞来源的IL-4的增加与交替激活的吞噬细胞的存在有关。
Expression of the chemokine receptor CCR2 can be detrimental or beneficial for infection resolution. Herein, we examined whether CCR2 was requisite for control of infection by the dimorphic fungus Histoplasma capsulatum. H. capsulatum-infected CCR2−/− mice manifested defects in inflammatory cell recruitment, increased IL-4, and progressive infection. Increased IL-4 in CCR2−/− mice primarily contributed to decreased host resistance as demonstrated by the ability of IL-4-neutralized CCR2−/− mice to resolve infection without altering inflammatory cell recruitment. Surprisingly, numerous alveolar macrophages and dendritic cells contributed to IL-4 production in CCR2−/− mice. IL-4-mediated impairment of immunity in CCR2−/− mice was associated with increased arginase-1 and YM1 transcription and increased transferrin receptor expression by phagocytic cells. Immunity in mice lacking the CCR2 ligand CCL2 was not impaired despite decreased inflammatory cell recruitment. Neutralization of the CCR2 ligand CCL7 in CCL2−/− mice, but not wild type, resulted in increased IL-4 and fungal burden. Thus, CCL7 in combination with CCL2 limits IL-4 generation and exerts control of host resistance. Furthermore, increased phagocyte-derived IL-4 in CCR2−/− mice is associated with the presence of alternatively activated phagocytic cells.
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