Schwann cells direct peripheral nerve regeneration through the Netrin-1 receptors, DCC and Unc5H2

Glia
C A WebberDouglas W Zochodne

Abstract

In the peripheral nervous system, Schwann cells (SCs) promote nerve regeneration by the secretion of trophic support molecules and the establishment of a supportive growth matrix. Elucidating factors that promote SC outgrowth following nerve injury is an important strategy for improving nerve regeneration. We identified the Netrin-1 receptors, Deleted in Colorectal Cancer (DCC) and Uncoordinated (Unc)5H2 as SC receptors that influence nerve regeneration by respectively promoting or inhibiting SC outgrowth. Significantly, we show both DCC and Unc5H2 receptors are distributed within SCs. In adult nerves, DCC is localized to the paranodes and Schmidt-Lantermann incisures of myelinating SCs, as well as along unmyelinated axons. After axotomy, DCC is prominently expressed in activated SCs at the regenerating nerve front. In contrast, Unc5H2 receptor is robustly distributed in myelinating SCs of the intact nerve and it is found at low levels in the SCs of the injury site. Local in vivo DCC siRNA mRNA knockdown at the growing tip of an injured nerve impaired SC activation and, in turn, significantly decreased axon regeneration. This forced DCC inhibition was associated with a dramatic reciprocal upregulation of Unc5H2 in the remaining...Continue Reading

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