Diminished Schwann cell repair responses underlie age-associated impaired axonal regeneration.

Diminished Schwann cell repair responses underlie age-associated impaired axonal regeneration.
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DOI:
10.1016/j.neuron.2014.06.016
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发表时间:
2014-07-16
期刊:
影响因子:
16.2
通讯作者:
Woolf CJ
Woolf CJ
中科院分区:
医学1区
文献类型:
--
作者:
Painter MW;Brosius Lutz A;Cheng YC;Latremoliere A;Duong K;Miller CM;Posada S;Cobos EJ;Zhang AX;Wagers AJ;Havton LA;Barres B;Omura T;Woolf CJ

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The regenerative capacity of the peripheral nervous system declines with age. Why this occurs, however, is unknown. We demonstrate that 24-month old mice exhibit an impairment of functional recovery after nerve injury compared to 2-month old animals. We find no difference in the intrinsic growth capacity between aged and young sensory neurons in vitro nor in their ability to activate growth-associated transcriptional programs after injury. Instead, using age-mismatched nerve transplants in vivo, we show that the extent of functional recovery depends on the age of the nerve graft, and not the age of the host. Molecular interrogation of the sciatic nerve reveals that aged Schwann cells (SCs) fail to rapidly activate a transcriptional repair program after injury. Functionally, aged SCs exhibit impaired de-differentiation, myelin clearance and macrophage recruitment. These results suggest that the age-associated decline in axonal regeneration results from diminished Schwann cell plasticity, leading to slower myelin clearance.
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