巨噬细胞产生的 VEGFC 通过清除作用诱导,改善心脏损伤和炎症。

Macrophage-produced VEGFC is induced by efferocytosis to ameliorate cardiac injury and inflammation.

机构信息

Department of Pathology.

Feinberg Cardiovascular and Renal Research Institute, and.

出版信息

J Clin Invest. 2022 May 2;132(9). doi: 10.1172/JCI140685.

Abstract

Clearance of dying cells by efferocytosis is necessary for cardiac repair after myocardial infarction (MI). Recent reports have suggested a protective role for vascular endothelial growth factor C (VEGFC) during acute cardiac lymphangiogenesis after MI. Here, we report that defective efferocytosis by macrophages after experimental MI led to a reduction in cardiac lymphangiogenesis and Vegfc expression. Cell-intrinsic evidence for efferocytic induction of Vegfc was revealed after adding apoptotic cells to cultured primary macrophages, which subsequently triggered Vegfc transcription and VEGFC secretion. Similarly, cardiac macrophages elevated Vegfc expression levels after MI, and mice deficient for myeloid Vegfc exhibited impaired ventricular contractility, adverse tissue remodeling, and reduced lymphangiogenesis. These results were observed in mouse models of permanent coronary occlusion and clinically relevant ischemia and reperfusion. Interestingly, myeloid Vegfc deficiency also led to increases in acute infarct size, prior to the amplitude of the acute cardiac lymphangiogenesis response. RNA-Seq and cardiac flow cytometry revealed that myeloid Vegfc deficiency was also characterized by a defective inflammatory response, and macrophage-produced VEGFC was directly effective at suppressing proinflammatory macrophage activation. Taken together, our findings indicate that cardiac macrophages promote healing through the promotion of myocardial lymphangiogenesis and the suppression of inflammatory cytokines.

摘要

细胞清除作用(efferocytosis)对于心肌梗死后的心脏修复是必要的。最近的报告表明,血管内皮生长因子 C(VEGFC)在心肌梗死后急性心脏淋巴管生成过程中具有保护作用。在这里,我们报告说,实验性心肌梗死后巨噬细胞的细胞清除作用缺陷导致心脏淋巴管生成和 Vegfc 表达减少。将凋亡细胞添加到培养的原代巨噬细胞中后,揭示了细胞内在的诱导 Vegfc 吞噬作用的证据,随后触发了 Vegfc 转录和 VEGFC 分泌。同样,心肌巨噬细胞在心肌梗死后上调了 Vegfc 表达水平,而骨髓源性 Vegfc 缺陷的小鼠表现出心室收缩功能障碍、不良的组织重塑和淋巴管生成减少。这些结果在永久性冠状动脉闭塞和临床相关缺血再灌注的小鼠模型中观察到。有趣的是,骨髓源性 Vegfc 缺陷也导致急性梗死面积增加,而急性心脏淋巴管生成反应的幅度之前就增加了。RNA-Seq 和心脏流式细胞术显示,骨髓源性 Vegfc 缺陷还表现出炎症反应缺陷,并且巨噬细胞产生的 VEGFC 直接有效抑制促炎巨噬细胞激活。总之,我们的研究结果表明,心脏巨噬细胞通过促进心肌淋巴管生成和抑制炎症细胞因子来促进愈合。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/989d/9057589/801df458cb94/jci-132-140685-g080.jpg

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