Formation of microtubule-based traps controls the sorting and concentration of vesicles to restricted sites of regenerating neurons after axotomy.

Formation of microtubule-based traps controls the sorting and concentration of vesicles to restricted sites of regenerating neurons after axotomy.
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基于微管的陷阱的形成控制轴切开术后囊泡的分选和浓度。

DOI:
10.1083/jcb.200607098
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发表时间:
2007-02-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Spira ME
Spira ME
中科院分区:
其他
文献类型:
--
作者:
Erez H;Malkinson G;Prager-Khoutorsky M;De Zeeuw CI;Hoogenraad CC;Spira ME

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横断的轴突尖端转化为生长锥(GC)是导致神经元再生的级联反应中的关键步骤。再生的关键是囊泡的供应和浓度在有限的网站沿着切断轴突。这些过程背后的机制在很大程度上是未知的。使用在线共聚焦成像的横切,培养的Aaplasia californica神经元,我们报告,轴突切断导致重新定位的微管(MT)的极性和形成两个不同的MT为基础的囊泡陷阱在切断轴突端。在切割端近端约100 μm处,形成了一个用于顺行运输囊泡的选择性陷阱,这就是正端陷阱。在远端,形成一个负端陷阱,专门捕获逆行运输的囊泡。前陷阱中顺行运输的囊泡的浓度优化了轴突切断后GC的形成。
Transformation of a transected axonal tip into a growth cone (GC) is a critical step in the cascade leading to neuronal regeneration. Critical to the regrowth is the supply and concentration of vesicles at restricted sites along the cut axon. The mechanisms underlying these processes are largely unknown. Using online confocal imaging of transected, cultured Aplysia californica neurons, we report that axotomy leads to reorientation of the microtubule (MT) polarities and formation of two distinct MT-based vesicle traps at the cut axonal end. Approximately 100 μm proximal to the cut end, a selective trap for anterogradely transported vesicles is formed, which is the plus end trap. Distally, a minus end trap is formed that exclusively captures retrogradely transported vesicles. The concentration of anterogradely transported vesicles in the former trap optimizes the formation of a GC after axotomy.
DOI: 10.1016/s0896-6273(00)80083-5
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