Charcot-Marie-Tooth causing HSPB1 mutations increase Cdk5-mediated phosphorylation of neurofilaments.

Charcot-Marie-Tooth causing HSPB1 mutations increase Cdk5-mediated phosphorylation of neurofilaments.
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DOI:
10.1007/s00401-013-1133-6
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发表时间:
2013-07
影响因子:
12.7
通讯作者:
Timmerman V
Timmerman V
中科院分区:
医学1区
文献类型:
--
作者:
Holmgren A;Bouhy D;De Winter V;Asselbergh B;Timmermans JP;Irobi J;Timmerman V

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小热休克蛋白HSPB1 (HSP27)的突变是轴突charco - marie - tooth神经病(CMT2F)和远端遗传性运动神经病的原因。为了更好地了解HSPB1突变对神经元细胞骨架的影响,我们稳定地用野生型和突变型HSPB1转导神经元细胞,并研究了神经丝(NFs)的轴突转运。我们观察到突变体HSPB1影响了NFs与顺行运动蛋白激酶的结合,减少了NFs的顺行运输。这些缺陷与NFs和周期蛋白依赖性激酶Cdk5磷酸化增加有关。由于Cdk5介导NF磷酸化,抑制Cdk5/p35可恢复突变型HSPB1神经元细胞中NF磷酸化水平以及NF与激酶的结合。总之,我们证明了HSPB1突变通过Cdk5诱导NFs的过度磷酸化,并减少NFs的顺行转运。本文的在线版本(doi:10.1007/s00401-013-1133-6)包含补充材料,仅供授权用户使用。
Mutations in the small heat shock protein HSPB1 (HSP27) are a cause of axonal Charcot–Marie–Tooth neuropathy (CMT2F) and distal hereditary motor neuropathy. To better understand the effect of mutations in HSPB1 on the neuronal cytoskeleton, we stably transduced neuronal cells with wild-type and mutant HSPB1 and investigated axonal transport of neurofilaments (NFs). We observed that mutant HSPB1 affected the binding of NFs to the anterograde motor protein kinesin, reducing anterograde transport of NFs. These deficits were associated with an increased phosphorylation of NFs and cyclin-dependent kinase Cdk5. As Cdk5 mediates NF phosphorylation, inhibition of Cdk5/p35 restored NF phosphorylation level, as well as NF binding to kinesin in mutant HSPB1 neuronal cells. Altogether, we demonstrate that HSPB1 mutations induce hyperphosphorylation of NFs through Cdk5 and reduce anterograde transport of NFs. The online version of this article (doi:10.1007/s00401-013-1133-6) contains supplementary material, which is available to authorized users.
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