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Circ Res:血管重塑血管外膜sca1阳性祖细胞的来源及功能研究

2017-03-22 MedSci MedSci原创

血管外膜位于血管壁外层,是包含滋养微血管、神经、成纤维细胞、免疫细胞和原位祖细胞的复合层。外膜祖细胞表达干细胞标记物Sca1和CD34(外膜sca1阳性祖细胞简称AdvSca1),具有体外分化为多个谱系的潜力,并且可能促进体内内膜损伤。近日,美国学者发表题为《分化型平滑肌细胞依赖Klf4产生原位血管外膜祖细胞亚群》的研究文章于血管研究顶级期刊Circulation Research。越来越多的数据

血管外膜位于血管壁外层,是包含滋养微血管、神经、成纤维细胞、免疫细胞和原位祖细胞的复合层。外膜祖细胞表达干细胞标记物Sca1和CD34(外膜sca1阳性祖细胞简称AdvSca1),具有体外分化为多个谱系的潜力,并且可能促进体内内膜损伤。

近日,美国学者发表题为“分化型平滑肌细胞依赖Klf4产生原位血管外膜祖细胞亚群”的研究文章于血管研究顶级期刊Circulation Research。

越来越多的数据支持AdvSca1细胞的存在,本研究的目的是确定其起源、多能性和异质性,以及在血管重塑中的作用。

使用2种在体命运图谱分析方法并结合平滑肌细胞(SMC)表观遗传谱系标记,作者发现AdvSca1细胞亚群是由原位分化型SMC产生。数据证实血管外膜含有表型不同的表达SMC,骨髓和造血祖细胞样标记的祖细胞亚群,并且分化型SMC是不同程度的每种亚群的来源。 SMC来源的AdvSca1细胞表现出多潜能表型,即在体内可分化为成熟SMC,原位巨噬细胞和内皮样细胞。血管损伤后,SMC衍生的AdvSca1细胞数量增加促进外膜重塑。分化型SMC中转录因子Klf4激活对体内SMC的重编程是必需的,体外研究也发现Klf4对维持AdvSca1祖细胞表型是必需的。

分化型SMC产生原位血管祖细胞是正常的生理过程,构成血管干细胞池并在血管稳态及疾病中发挥重要作用。

原始出处:Majesky MW,Horita H,et al. Differentiated Smooth Muscle Cells Generate a Subpopulation of Resident Vascular Progenitor Cells in the Adventitia Regulated by Klf4. Circ Res. 2017 Jan 20;120(2):296-311.

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