巨噬细胞对于早期伤口愈合反应和纤维血管瘢痕的形成至关重要。

Macrophages are essential for the early wound healing response and the formation of a fibrovascular scar.

机构信息

Cutaneous Biology Research Center, Massachusetts General Hospital, and Department of Dermatology, Harvard Medical School, Charlestown, Massachusetts 02129, USA.

出版信息

Am J Pathol. 2013 Jun;182(6):2407-17. doi: 10.1016/j.ajpath.2013.02.032. Epub 2013 Apr 18.

Abstract

After wounding, multiple cell types interact to form a fibrovascular scar; the formation and cellular origins of these scars are incompletely understood. We used a laser-injury wound model of choroidal neovascularization in the eye to determine the spatiotemporal cellular events that lead to formation of a fibrovascular scar. After laser injury, F4/80(+) myeloid cells infiltrate the wound site and induce smooth muscle actin (SMA) expression in adjacent retinal pigment epithelial cells, with subsequent formation of a SMA(+)NG2(+) myofibroblastic scaffold, into which endothelial cells then infiltrate to form a fibrovascular lesion. Cells of the fibrovascular scaffold express the proangiogenic factor IL-1β strongly, whereas retinal pigment epithelial cells are the main source of VEGF-A. Subsequent choroidal neovascularization is limited to the area demarcated by this myofibroblastic scaffold and occurs independently of epithelial- or myeloid-derived VEGF-A. The SMA(+)NG2(+) myofibroblastic cells, F4/80(+) macrophages, and adjacent epithelial cells actively proliferate in the early phase of the wound healing response. Cell-lineage tracing experiments suggest that the SMA(+)NG2(+) myofibroblastic scaffold originates from choroidal pericyte-like cells. Targeted ablation of macrophages inhibits the formation of this fibrovascular scaffold, and expression analysis reveals that these macrophages are Arg1(+)YM1(+)F4/80(+) alternatively activated M2-like macrophages, which do not require IL-4/STAT6 or IL-10 signaling for their activation. Thus, macrophages are essential for the early wound healing response and the formation of a fibrovascular scar.

摘要

创伤后,多种细胞类型相互作用形成纤维血管瘢痕;这些瘢痕的形成和细胞来源尚不完全清楚。我们使用眼部脉络膜新生血管的激光损伤模型,来确定导致纤维血管瘢痕形成的时空细胞事件。激光损伤后,F4/80(+)髓样细胞浸润伤口部位,并诱导相邻视网膜色素上皮细胞表达平滑肌肌动蛋白(SMA),随后形成 SMA(+)NG2(+)肌成纤维细胞支架,其中内皮细胞随后浸润形成纤维血管病变。纤维血管支架中的细胞强烈表达促血管生成因子 IL-1β,而视网膜色素上皮细胞是 VEGF-A 的主要来源。随后的脉络膜新生血管仅限于这个肌成纤维支架所划定的区域发生,与上皮细胞或髓样细胞衍生的 VEGF-A 无关。SMA(+)NG2(+)肌成纤维细胞、F4/80(+)巨噬细胞和相邻的上皮细胞在伤口愈合反应的早期阶段积极增殖。细胞谱系追踪实验表明,SMA(+)NG2(+)肌成纤维细胞支架来源于脉络丛周细胞样细胞。巨噬细胞的靶向消融抑制了这种纤维血管支架的形成,表达分析显示这些巨噬细胞是 Arg1(+)YM1(+)F4/80(+)的替代激活的 M2 样巨噬细胞,它们的激活不需要 IL-4/STAT6 或 IL-10 信号通路。因此,巨噬细胞对于早期伤口愈合反应和纤维血管瘢痕的形成是必不可少的。

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