Circulation:循环单核细胞缺陷可改善马凡综合征患者的瓣膜黏液样变性的进展

2020-01-28 QQY MedSci原创

瓣膜黏液样变性(MVD)涉及心脏瓣膜进行性增厚和变性,导致瓣膜脱垂、血流回流和心功能受损。近期,在黏液样变性的瓣膜中发现了主要由巨噬细胞组成的白细胞,但这些细胞出现的时间和在MVD进展中的作用尚不清楚。研究人员通过MFS小鼠(Fbn1C1039G/+)、基因编辑的MFS猪(FBN1Glu433AsnfsX98/+)和MFS患者来源的二尖瓣在马凡氏综合征的背景下研究MVD的进展、巨噬细胞和瓣膜微环境

瓣膜黏液样变性(MVD)涉及心脏瓣膜进行性增厚和变性,导致瓣膜脱垂、血流回流和心功能受损。近期,在黏液样变性的瓣膜中发现了主要由巨噬细胞组成的白细胞,但这些细胞出现的时间和在MVD进展中的作用尚不清楚。

研究人员通过MFS小鼠(Fbn1C1039G/+)、基因编辑的MFS猪(FBN1Glu433AsnfsX98/+)和MFS患者来源的二尖瓣在马凡氏综合征的背景下研究MVD的进展、巨噬细胞和瓣膜微环境。分别用无症状的人和犬粘液样变性瓣膜进行组织学和转录本分析。用移植了mTomato+骨髓细胞的MFS小鼠或携带RFP标记的2型C-C趋化因子受体(CCR2)的MFS小鼠来研究巨噬细胞的个体发生。

MFS小鼠在2个月大时可再现粘液性瓣膜病的组织病理学特征,包括二尖瓣增厚、小叶细胞增多、以蛋白多糖积累和胶原破碎为特征的细胞外基质异常。MFS小鼠的病变二尖瓣同时还表现出浸润细胞(MHCII+, CCR2+)和滞留的巨噬细胞(CD206+, CCR2–)显著增多,伴随趋化因子活性和炎性胞外基质变性显著增强。基因编辑的MFS猪和MFS患者的二尖瓣样本显示单核细胞和巨噬细胞(CD14+、CD64+、CD68+和CD163+)增加。对遗传性(MFS小鼠)和获得性(人和犬)MVD的比较转录组评估揭示了病变瓣膜中共有的上调炎症反应。值得注意的是,单核细胞的缺乏对MVD进展具有保护作用,导致MHCII巨噬细胞显著减少、小叶增厚最小,二尖瓣完整得以保留。

总而言之,本研究表明无菌性炎症是疾病进展的新模式,本研究首次提示单核细胞或可作为MVD的候选治疗靶点。

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    2020-01-30 1478fa69m73暂无昵称

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    2020-01-30 huangdf
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