The microtubule minus-end-binding protein patronin/PTRN-1 is required for axon regeneration in C. elegans.

The microtubule minus-end-binding protein patronin/PTRN-1 is required for axon regeneration in C. elegans.
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DOI:
10.1016/j.celrep.2014.09.054
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发表时间:
2014-11-06
期刊:
影响因子:
8.8
通讯作者:
Chisholm AD
Chisholm AD
中科院分区:
生物学1区
文献类型:
--
作者:
Chuang M;Goncharov A;Wang S;Oegema K;Jin Y;Chisholm AD

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微管动力学的精确调控越来越被认为是轴突再生的关键决定因素。与发育中的神经元相反,成熟的轴突表现为非中心体微管核化。轴突再生中调节非中心体MT构筑的因素仍然知之甚少。我们报道了线虫Patronin/哪吒/CAMSAP微管负端结合蛋白家族的成员PTRN-1对体内高效的轴突再生至关重要。PTRN-1缺失突变体一般显示正常的发育轴突生长,但显著损害激光切断术后的再生再生。出乎意料的是,在ptrn-1突变体中,成熟轴突在损伤前后显示出动态轴突MT的数量增加,表明PTRN-1抑制了MT的动力学。PTRN-1的CKK结构域对于其轴突再生和MT动力学功能是必要和充分的,并且似乎不依赖于负端定位而稳定MTS。而在发育中的神经元中,PTRN-1抑制DLK-1 MAPK级联的活性,我们发现在再生过程中,PTRN-1和DLK-1共同发挥促进轴突再生的作用。
Precise regulation of microtubule (MT) dynamics is increasingly recognized as a critical determinant of axon regeneration. In contrast to developing neurons, mature axons exhibit noncentrosomal microtubule nucleation. The factors regulating noncentrosomal MT architecture in axon regeneration remain poorly understood. We report that PTRN-1, the C. elegans member of the Patronin/Nezha/CAMSAP family of microtubule minus end binding proteins, is critical for efficient axon regeneration in vivo. ptrn-1 null mutants display generally normal developmental axon outgrowth but significantly impaired regenerative regrowth after laser axotomy. Unexpectedly, mature axons in ptrn-1 mutants display elevated numbers of dynamic axonal MT before and after injury, suggesting PTRN-1 inhibits MT dynamics. The CKK domain of PTRN-1 is necessary and sufficient for its functions in axon regeneration and MT dynamics, and appears to stabilize MTs independent of minus end localization. Whereas in developing neurons PTRN-1 inhibits activity of the DLK-1 MAPK cascade, we find that in regeneration PTRN-1 and DLK-1 function together to promote axonal regrowth.
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