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Autophagy:自噬蛋白影响大脑发育

2017-12-25 海北 MedSci原创

我们已知哺乳动物ULK1(unc-51样激酶1)和ULK2,秀丽隐杆线虫UNC-51,和黑腹果蝇Atg1是丝氨酸/苏氨酸激酶,其可以响应各种类型的细胞应激,进而调节细胞自噬通量。

我们已知哺乳动物ULK1(unc-51样激酶1)和ULK2,秀丽隐杆线虫UNC-51,和黑腹果蝇Atg1是丝氨酸/苏氨酸激酶,其可以响应各种类型的细胞应激,进而调节细胞自噬通量。 已有的研究显示,线虫的UNC-51和果蝇的Atg1也能促进轴突生长和去分化。如果破坏这些基因,会导致无脊椎动物的轴突导向有缺陷。尽管已知在体外破坏ULK1 / 2功能会损害正常神经突的生长,但至今为止,ULK1和ULK2在发育中的大脑中的作用仍然没有得到很好的表征。

近日,来自圣裘德儿童研究医院的研究人员发现,ULK1和ULK2是轴突在前脑正确投影所必需的。在中枢神经系统中缺少Ulk1和Ulk2的小鼠表现出胼胝体,前连合,皮质丘脑轴突,和丘脑皮层轴突的轴突寻路和轴突解聚的缺陷。这些缺陷损害了胼胝体轴突的中线穿越,造成了前连合体的发育不全和躯体感觉皮层的组织紊乱。

在缺乏其他自噬基因的小鼠(即,Atg7或Rb1cc1 [RB1])中无法重现ulk1 / 2双敲除小鼠和中枢神经系统特异性(Nes-Cre)Ulk1 / 2-条件双敲除小鼠中观察到的轴突指导缺陷。Ulk1 / 2缺陷小鼠的大脑没有显示由ambra1(自噬/ Beclin1调节因子1)和Rb1cc1缺陷,或SQSTM1(半胱氨酸蛋白酶体1)以及泛素沉积物的累积导致的干细胞缺陷。

总之,这些数据表明ULK1和ULK2是通过非典型(即自噬非依赖性)途径在哺乳动物大脑发育期间调节轴突指导。


原始出处:

Bo Wang et al. The autophagy-inducing kinases, ULK1 and ULK2, regulate axon guidance in the developing mouse forebrain via a noncanonical pathwayAutophagy, 2017. doi: https://doi.org/10.1080/15548627.2017.1386820


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    2018-01-03 1209e435m98(暂无昵称)

    学习了.谢谢分享

    0

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    2017-12-27 neurowu
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    2017-12-25 1ddf0692m34(暂无匿称)

    学习了.涨知识

    0

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