Interferon-gamma coordinates CCL3-mediated neutrophil recruitment in vivo.

Interferon-gamma coordinates CCL3-mediated neutrophil recruitment in vivo.
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DOI:
10.1186/1471-2172-10-14
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发表时间:
2009-03-19
期刊:
影响因子:
3
通讯作者:
Domachowske JB
Domachowske JB
中科院分区:
医学4区
文献类型:
--
作者:
Bonville CA;Percopo CM;Dyer KD;Gao J;Prussin C;Foster B;Rosenberg HF;Domachowske JB

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我们先前已表明,呼吸道病原体小鼠肺炎病毒(PVM)的急性感染会导致促炎性趋化因子CCL3在局部产生,并且在CCL3 -/-小鼠中,对PVM感染作出反应的中性粒细胞募集显著减少。 在这项工作中,我们证明CCL3介导的中性粒细胞募集是由干扰素 -γ(IFNγ)协调的。在IFNγ受体基因缺失的小鼠中,对PVM感染作出反应的中性粒细胞募集减少了五倍,尽管来自IFNγR -/-小鼠的中性粒细胞表达CCL3受体CCR1的转录本,并且在体外对CCL3有功能性反应。同样,在没有PVM感染的情况下,在没有IFNγ时,仅CCL3过表达不能引起中性粒细胞募集。有趣的是,尽管补充IFNγ恢复了中性粒细胞募集,并导致CCL3过表达的IFNγ -/-小鼠体重持续下降,但仅CCL3介导的中性粒细胞募集不会导致严重病毒感染所特有的肺水肿或呼吸衰竭,这表明CCL3和IFN -γ一起足以促进中性粒细胞募集,但不会导致病理性激活。 我们的研究结果揭示了IFNγ和CCL3之间一种此前未被认识到的层级相互作用,这表明IFNγ对于体内CCL3介导的中性粒细胞募集至关重要。
We have shown previously that acute infection with the respiratory pathogen, pneumonia virus of mice (PVM), results in local production of the proinflammatory chemokine, CCL3, and that neutrophil recruitment in response to PVM infection is reduced dramatically in CCL3 -/- mice. In this work, we demonstrate that CCL3-mediated neutrophil recruitment is coordinated by interferon-gamma (IFNγ). Neutrophil recruitment in response to PVM infection was diminished five-fold in IFNγ receptor gene-deleted mice, although neutrophils from IFNγR -/- mice expressed transcripts for the CCL3 receptor, CCR1 and responded functionally to CCL3 ex vivo. Similarly, in the absence of PVM infection, CCL3 overexpression alone could not elicit neutrophil recruitment in the absence of IFNγ. Interestingly, although supplemental IFNγ restored neutrophil recruitment and resulted in a sustained weight loss among CCL3-overexpressing IFNγ -/- mice, CCL3-mediated neutrophil recruitment alone did not result in the pulmonary edema or respiratory failure characteristic of severe viral infection, suggesting that CCL3 and IFN-γ together are sufficient to promote neutrophil recruitment but not pathologic activation. Our findings reveal a heretofore unrecognized hierarchical interaction between the IFNγ and CCL3, which demonstrate that IFNγ is crucial for CCL3-mediated neutrophil recruitment in vivo.
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