STM:未成熟的干细胞可修复肺损伤

2015-02-02 MedSci MedSci原创

目前,在急性肺损伤中存活下来的病人的肺部功能都可恢复,这意味着成人的肺组织可在某种程度上再生。根据不同肺损伤的成因或严重性,许多不同种类的始祖细胞都可成功帮助小鼠肺部再生,这些始祖细胞包括肺泡II型细胞以及气道末梢肝细胞。近日,Vaughan和他的团队发现未成熟的隐形内皮谱系始祖细胞(LNEP cells)可以恢复因流感病毒或博来霉素而引起的肺损伤。LNEP细胞在正常小鼠的肺末梢中是处于休眠状态的

目前,在急性肺损伤中存活下来的病人的肺部功能都可恢复,这意味着成人的肺组织可在某种程度上再生。根据不同肺损伤的成因或严重性,许多不同种类的始祖细胞都可成功帮助小鼠肺部再生,这些始祖细胞包括肺泡II型细胞以及气道末梢肝细胞。近日,Vaughan和他的团队发现未成熟的隐形内皮谱系始祖细胞(LNEP cells)可以恢复因流感病毒或博来霉素而引起的肺损伤。


LNEP细胞在正常小鼠的肺末梢中是处于休眠状态的,并且它们不会表达包括CC10蛋白和肺表面活化蛋白C(SPC)在内的成熟谱系标记。可是,研究人员证明了LNEP细胞会在肺损伤后移动到损伤部位帮助肺部重建。Vaughan等研究员使用细胞谱追踪以及细胞移植的方法发现LNEP细胞是一种多能细胞,它们可以分化成俱乐部细胞(club cells)和 肺泡细胞,但成熟了的内皮谱系细胞并没有这个功能。

有趣的是,尽管大量Notch信号可以活化LNEP细胞,但如果Notch信号停留时间过长会导致小鼠出现蜂窝肺,这意味着残留的Notch信号会抑制肺泡细胞的分裂从而导致肺组织再生失败。同时,他们在患有特发性肺纤维化和肺硬化的病人中得到的肺中发现了过分活跃的Notch信号以及蜂窝性囊肿,这证实了不同的Notch信号会影响模拟LNEP人类肺始祖细胞的分化。这个实验证明了调节Notch信号以及LNEP细胞的活化程度可以帮助减缓人类肺纤维化的成长。

原始出处:

J. Sun, Breathing fresh: Rare stems cells repair injured lung. Sci.Transl.Med. 7, 271ec12 (2015).

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    2015-11-18 gdsun
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    2015-02-08 xjtumed09

    长知识了!

    0

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    2015-02-04 tastas
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    2015-02-02 MedSci客户端网友

    好的现象!

    0

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    2015-02-02 ioslove

    stm !

    0

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