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Mixed Lineage Kinase Domain-like Protein MLKL Breaks Down Myelin following Nerve Injury.
Molecular Cell ( IF 14.548 ) Pub Date : 2018-Nov-0 , DOI: 10.1016/j.molcel.2018.09.011
Zhengxin Ying, Chenjie Pan, Tianyu Shao, Liqing Liu, Lin Li, Dejia Guo, Sitao Zhang, Tianyi Yuan, Ran Cao, Zhaodi Jiang, She Chen, Fengchao Wang, Xiaodong Wang

Successful regeneration of severed peripheral nerves requires the breakdown and subsequent clearance of myelin, tightly packed membrane sheaths of Schwann cells that protect nerve fibers and harbor nerve growth-inhibitory proteins. How Schwann cells initiate myelin breakdown in response to injury is still largely unknown. Here we report that, following sciatic nerve injury, MLKL, a pseudokinase known to rupture cell membranes during necroptotic cell death, is induced and targets the myelin sheath membrane of Schwann cells to promote myelin breakdown. The function of MLKL in disrupting myelin sheaths requires injury-induced phosphorylation of serine 441, an activation signal distinct from the necroptosis-inducing phosphorylation by RIP3 kinase. Mice with Mlkl specifically knocked out in Schwann cells showed delayed myelin sheath breakdown. Lack of MLKL reduced nerve regeneration following injury, whereas overexpression of MLKL accelerated myelin breakdown and promoted the regeneration of axons.
更新日期:2018-10-19

 

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