An abundant tissue macrophage population in the adult murine heart with a distinct alternatively-activated macrophage profile.

An abundant tissue macrophage population in the adult murine heart with a distinct alternatively-activated macrophage profile.
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成年小鼠心脏中存在丰富的组织巨噬细胞群,具有独特的交替激活巨噬细胞特征。

DOI:
10.1371/journal.pone.0036814
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Rosenthal NA
Rosenthal NA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Pinto AR;Paolicelli R;Salimova E;Gospocic J;Slonimsky E;Bilbao-Cortes D;Godwin JW;Rosenthal NA

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心脏组织巨噬细胞(cTM)是一种以前未表征的细胞类型,我们已经确定,并在这里作为一个丰富的GFP+人口在成年Cx 3cr 1GFP/+敲入小鼠心脏。它们包括心肌中的主要髓样细胞群,并且在整个心肌间质空间中发现,与毛细血管内皮细胞和心肌细胞直接相互作用。基于流式细胞术的免疫表型分析显示,cTM表现出典型的巨噬细胞标志物。基因表达分析表明,cTM(CD 45 + CD 11b +GFP+)与从成年Cx 3cr 1GFP/+小鼠的脾和脑中分选的单核CD 45 + CD 11b +GFP+细胞不同。基因表达谱分析显示,cTM非常类似于交替激活的抗炎M2巨噬细胞,表达许多M2标志物,包括Mrc 1,CD 163和Lyve-1。虽然cTM执行正常组织巨噬细胞稳态功能,但它们也表现出独特的表型,涉及有益因子(包括IGF-1)的分泌和免疫调节。总之,在细胞和分子水平上对cTM的表征定义了这些细胞在心脏稳态中的潜在重要作用。
Cardiac tissue macrophages (cTMs) are a previously uncharacterised cell type that we have identified and characterise here as an abundant GFP+ population within the adult Cx3cr1GFP/+ knock-in mouse heart. They comprise the predominant myeloid cell population in the myocardium, and are found throughout myocardial interstitial spaces interacting directly with capillary endothelial cells and cardiomyocytes. Flow cytometry-based immunophenotyping shows that cTMs exhibit canonical macrophage markers. Gene expression analysis shows that cTMs (CD45+CD11b+GFP+) are distinct from mononuclear CD45+CD11b+GFP+ cells sorted from the spleen and brain of adult Cx3cr1GFP/+ mice. Gene expression profiling reveals that cTMs closely resemble alternatively-activated anti-inflammatory M2 macrophages, expressing a number of M2 markers, including Mrc1, CD163, and Lyve-1. While cTMs perform normal tissue macrophage homeostatic functions, they also exhibit a distinct phenotype, involving secretion of salutary factors (including IGF-1) and immune modulation. In summary, the characterisation of cTMs at the cellular and molecular level defines a potentially important role for these cells in cardiac homeostasis.
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