Circ-Cardiovasc Gene:透明质酸酶2缺乏会增加间质细胞,导致先天性心脏病和心力衰竭

2017-02-18 xing.T MedSci原创

这些数据表明Hyal2−/−小鼠会扰乱正常的HA分解代谢,导致HA增加,可促进内皮细胞向间质细胞转化以及间质细胞的增殖。过量的内皮细胞间质转化,导致间充质细胞增多,是人类和小鼠心脏形态异常的可能原因。在小鼠中,这些异常会导致渐进性和严重的舒张功能障碍,最终发生心脏衰竭。

透明质酸(HA)是小鼠内皮细胞发生间质转化和心脏正常发育所必需的。透明质酸酶2缺失(Hyal2−/−)的小鼠和人会发生心脏异常提示HA的清除在正常心脏发育中很重要。最近,心血管领域权威杂志Circulation-cardiovascular genetics上发表了一篇研究文章,研究人员在Hyal2−/−小鼠中进行了一项关于心脏结构和功能的纵向研究,旨在确定Hyal2−/−在何时会如何导致这些异常的。

研究人员采用超声心动图发现Hyal2−/−小鼠在4周龄时心房扩大、心房组织肿块、瓣膜增厚以及舒张功能障碍并年龄的增长而进展。相比于对照小鼠,Hyal2−/−小鼠的这些异常与HA、波形蛋白阳性细胞和纤维化增加相关。根据心功能障碍的严重程度,Hyal2−/−小鼠被分为急性组和慢性组,分别在12周和25周死亡。Hyal2−/−胚胎心脏中增加的HA水平与骨髓间充质细胞,而不是血管内皮生长因子,表明HYAL2是抑制内皮细胞间质转型的重要因素。与此相一致,在野生型的胚胎中,很容易检测到HA和 HYAL2,并且HA水平随年龄增长而下降。

这些数据表明Hyal2−/−小鼠会扰乱正常的HA分解代谢,导致HA增加,可促进内皮细胞向间质细胞转化以及间质细胞的增殖。过量的内皮细胞间质转化,导致间充质细胞增多,是人类和小鼠心脏形态异常的可能原因。在小鼠中,这些异常会导致渐进性和严重的舒张功能障碍,最终发生心脏衰竭。

原始出处:


Biswajit Chowdhury,et al. Hyaluronidase 2 Deficiency Causes Increased Mesenchymal Cells, Congenital Heart Defects, and Heart Failure. Circulation-cardiovascular genetics. 2017.  https://doi.org/10.1161/CIRCGENETICS.116.001598

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    2017-10-21 cy0324
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    2017-05-28 quxin068
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    2017-02-20 huirong
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    2017-02-20 1e10c84am36(暂无匿称)

    文章真心不错耶

    0