Eosinophils improve cardiac function after myocardial infarction.

Eosinophils improve cardiac function after myocardial infarction.
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嗜酸性粒细胞可改善心肌梗塞后的心脏功能。

DOI:
10.1038/s41467-020-19297-5
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发表时间:
2020-12-16
影响因子:
16.6
通讯作者:
Shi GP
Shi GP
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu J;Yang C;Liu T;Deng Z;Fang W;Zhang X;Li J;Huang Q;Liu C;Wang Y;Yang D;Sukhova GK;Lindholt JS;Diederichsen A;Rasmussen LM;Li D;Newton G;Luscinskas FW;Liu L;Libby P;Wang J;Guo J;Shi GP

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临床研究表明,血液嗜酸性粒细胞计数和嗜酸性粒细胞阳离子蛋白的变化可能是人类冠心病的危险因素。在这里,我们报告了心肌梗死(MI)后人类和小鼠血液或心脏嗜酸性粒细胞计数的增加,主要发生在梗死区域。遗传性或诱导性嗜酸性粒细胞耗竭会加剧心肌梗死后的心功能障碍、细胞死亡和纤维化,同时伴有心脏急性增高和脾中性粒细胞和单核细胞慢性增高。机制研究揭示了嗜酸性粒细胞IL4和阳离子蛋白mEar1在阻断H2O2和缺氧诱导的小鼠和人心肌细胞死亡、TGF-β诱导的心脏成纤维细胞Smad2/3活化和TNF-α诱导的心脏内皮细胞单层中性粒细胞粘附中的作用。体外培养的WT小鼠嗜酸性粒细胞或重组mEar1蛋白,而不是来自il4缺陷小鼠的嗜酸性粒细胞,有效地纠正了嗜酸性粒细胞缺陷的∆dblGATA小鼠加重的心功能障碍。本研究确立了嗜酸性粒细胞在心肌梗死后心脏中的保护作用。
Clinical studies reveal changes in blood eosinophil counts and eosinophil cationic proteins that may serve as risk factors for human coronary heart diseases. Here we report an increase of blood or heart eosinophil counts in humans and mice after myocardial infarction (MI), mostly in the infarct region. Genetic or inducible depletion of eosinophils exacerbates cardiac dysfunction, cell death, and fibrosis post-MI, with concurrent acute increase of heart and chronic increase of splenic neutrophils and monocytes. Mechanistic studies reveal roles of eosinophil IL4 and cationic protein mEar1 in blocking H2O2- and hypoxia-induced mouse and human cardiomyocyte death, TGF-β-induced cardiac fibroblast Smad2/3 activation, and TNF-α-induced neutrophil adhesion on the heart endothelial cell monolayer. In vitro-cultured eosinophils from WT mice or recombinant mEar1 protein, but not eosinophils from IL4-deficient mice, effectively correct exacerbated cardiac dysfunctions in eosinophil-deficient ∆dblGATA mice. This study establishes a cardioprotective role of eosinophils in post-MI hearts.
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