Inflammation triggers emergency granulopoiesis through a density-dependent feedback mechanism.

Inflammation triggers emergency granulopoiesis through a density-dependent feedback mechanism.
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DOI:
10.1371/journal.pone.0019957
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Kelsoe G
Kelsoe G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cain DW;Snowden PB;Sempowski GD;Kelsoe G

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通常,中性粒细胞池通过需要转录因子 C/EBPα 的稳态机制来维持。然而,炎症通过依赖于 C/EBPβ 的“紧急”粒细胞生成的独特途径诱导中性粒细胞增多。在这里,我们在小鼠中证明明矾通过 IL-1RI 依赖性诱导 G-CSF 触发紧急粒细胞生成。 G-CSF/G-CSF-R 中和会损害造血干细胞和祖细胞 (HSPC) 对明矾的增殖反应,但也会消除 BM 中性粒细胞的急性动员,这增加了 HSPC 对炎症反应是 BM 中性粒细胞储备耗尽的间接结果的可能性。通过用 Gr-1 mAb 耗竭或骨髓特异性消融 Mcl-1 诱导中性粒细胞减少症,通过 IL-1RI 独立途径引发 G-CSF,刺激粒细胞生成反应,这与佐剂诱导的粒细胞生成反应没有区别。值得注意的是,C/EBPβ被认为是增强BM生成能力所必需的,但对于HSPC增殖增加到明矾或中性粒细胞减少症来说是可有可无的,但在粒细胞生成恢复期间的终末中性粒细胞分化中发挥作用。我们得出的结论是,明矾通过 IL-1RI 引起 G-CSF 产生短暂增加,以动员 BM 中性粒细胞,但密度依赖性反馈维持 G-CSF 加速粒细胞生成。
Normally, neutrophil pools are maintained by homeostatic mechanisms that require the transcription factor C/EBPα. Inflammation, however, induces neutrophilia through a distinct pathway of “emergency” granulopoiesis that is dependent on C/EBPβ. Here, we show in mice that alum triggers emergency granulopoiesis through the IL-1RI-dependent induction of G-CSF. G-CSF/G-CSF-R neutralization impairs proliferative responses of hematopoietic stem and progenitor cells (HSPC) to alum, but also abrogates the acute mobilization of BM neutrophils, raising the possibility that HSPC responses to inflammation are an indirect result of the exhaustion of BM neutrophil stores. The induction of neutropenia, via depletion with Gr-1 mAb or myeloid-specific ablation of Mcl-1, elicits G-CSF via an IL-1RI-independent pathway, stimulating granulopoietic responses indistinguishable from those induced by adjuvant. Notably, C/EBPβ, thought to be necessary for enhanced generative capacity of BM, is dispensable for increased proliferation of HSPC to alum or neutropenia, but plays a role in terminal neutrophil differentiation during granulopoietic recovery. We conclude that alum elicits a transient increase in G-CSF production via IL-1RI for the mobilization of BM neutrophils, but density-dependent feedback sustains G-CSF for accelerated granulopoiesis.
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