IL-4 directly signals tissue-resident macrophages to proliferate beyond homeostatic levels controlled by CSF-1.

IL-4 directly signals tissue-resident macrophages to proliferate beyond homeostatic levels controlled by CSF-1.
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DOI:
10.1084/jem.20121999
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发表时间:
2013-10-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Allen JE
Allen JE
中科院分区:
其他
文献类型:
--
作者:
Jenkins SJ;Ruckerl D;Thomas GD;Hewitson JP;Duncan S;Brombacher F;Maizels RM;Hume DA;Allen JE

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IL-4 and CSF-1 both contribute to macrophage proliferation during nematode infection, but IL-4 permits increased tissue macrophage density without the coincident monocyte infiltration associated with elevated CSF-1 levels. Macrophages (MΦs) colonize tissues during inflammation in two distinct ways: recruitment of monocyte precursors and proliferation of resident cells. We recently revealed a major role for IL-4 in the proliferative expansion of resident MΦs during a Th2-biased tissue nematode infection. We now show that proliferation of MΦs during intestinal as well as tissue nematode infection is restricted to sites of IL-4 production and requires MΦ-intrinsic IL-4R signaling. However, both IL-4Rα–dependent and –independent mechanisms contributed to MΦ proliferation during nematode infections. IL-4R–independent proliferation was controlled by a rise in local CSF-1 levels, but IL-4Rα expression conferred a competitive advantage with higher and more sustained proliferation and increased accumulation of IL-4Rα+ compared with IL-4Rα− cells. Mechanistically, this occurred by conversion of IL-4Rα+ MΦs from a CSF-1–dependent to –independent program of proliferation. Thus, IL-4 increases the relative density of tissue MΦs by overcoming the constraints mediated by the availability of CSF-1. Finally, although both elevated CSF1R and IL-4Rα signaling triggered proliferation above homeostatic levels, only CSF-1 led to the recruitment of monocytes and neutrophils. Thus, the IL-4 pathway of proliferation may have developed as an alternative to CSF-1 to increase resident MΦ numbers without coincident monocyte recruitment.
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