PLoS Biol:开发出修复脊柱损伤的新疗法

2014-08-11 佚名 生物谷

青蛙、狗以及鲸鱼都可以实现机体损伤后神经再生,而人类和灵长类动物却不行,近日,来自索尔克研究所的研究人员通过研究就发现,一种小分子可以促进损伤的神经再生,并且可以有效形成神经回路,这就为开发治疗严重脊髓损伤以及瘫痪个体的新型疗法提供了新的希望,相关研究刊登于国际之PLoS Biology上。 研究者Lee及同事表示,我们发现蛋白质p45可以通过解除轴突鞘(髓磷脂)的生长抑制作用而促进神经再

青蛙、狗以及鲸鱼都可以实现机体损伤后神经再生,而人类和灵长类动物却不行,近日,来自索尔克研究所的研究人员通过研究就发现,一种小分子可以促进损伤的神经再生,并且可以有效形成神经回路,这就为开发治疗严重脊髓损伤以及瘫痪个体的新型疗法提供了新的希望,相关研究刊登于国际之PLoS Biology上。[pdf free]

研究者Lee及同事表示,我们发现蛋白质p45可以通过解除轴突鞘(髓磷脂)的生长抑制作用而促进神经再生,然而对于人类、灵长类动物以及某些其他的高等动物来讲,其机体中并没有蛋白质p45,而研究者却在人类、灵长类动物以及某些其他的高等动物机体中发现了蛋白质p75,当在这些动物中发生神经损伤时,该蛋白质就可以结合轴突的髓磷脂,进而促进神经再生,p75实际上还可以抑制损伤神经的生长。

目前研究人员并不清楚为何神经再生不能够在人类机体中发生,他们推测人类大脑中并没有较多的神经连接,因此神经再生并不能够完全实现。这项研究中研究者发现蛋白质p75可以互相结合形成类似插销样的结构,从而附着在髓磷脂释放的抑制剂上。通过利用核磁共振技术来研究p75在溶液中的构象,研究人员发现生长促进蛋白p45可以破坏p75的结合配对。

而且p45可以结合到p75蛋白质的特殊区域,该特殊区域是p75配对的关键区域,这无疑就降低了p75结合配对的数量,因此研究人员就表示,如果可以开发一种有效破坏p75的制剂(p45或者其它的破坏性分子),那么或许就可以帮助开发治疗脊髓损伤的新型疗法。

目前一种治疗方法就是向损伤的神经元位置引入大量的p45蛋白来抑制p75的作用,下一步研究人员将会继续深入研究是否引入p45可以帮助实现人类神经的再生;相关研究由美国国立卫生研究院等机构提供资助。

原始出处:

Vilar M1, Sung TC2, Chen Z2, García-Carpio I3, Fernandez EM3, Xu J2, Riek R4, Lee KF2.Heterodimerization of p45-p75 Modulates p75 Signaling: Structural Basis and Mechanism of Action.PLoS Biol. 2014 Aug 5;12(8):e1001918. doi: 10.1371/journal.pbio.1001918. eCollection 2014.[pdf free]

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    2015-03-26 sunylz
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    2014-10-10 zyzyyan

    一个P45蛋白就可以吗?

    0

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    2014-08-13 doctorgxp

    脊髓损伤的预后一直是个难题。

    0

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    2014-08-13 kcb074