Myelinated peripheral axons are more vulnerable to mechanical trauma in a model of enlarged axonal diameters

Author:

Gargareta Vasiliki‐Ilya1ORCID,Berghoff Stefan A.1ORCID,Krauter Doris1ORCID,Hümmert Sophie1ORCID,Marshall‐Phelps Katy L. H.2ORCID,Möbius Wiebke1ORCID,Nave Klaus‐Armin1ORCID,Fledrich Robert1ORCID,Werner Hauke B.13ORCID,Eichel‐Vogel Maria A.12ORCID

Affiliation:

1. Department of Neurogenetics Max Planck Institute for Multidisciplinary Sciences Göttingen Germany

2. Centre for Discovery Brain Sciences University of Edinburgh Edinburgh UK

3. Biology and Psychology University of Göttingen, Göttingen, Germany

Abstract

AbstractThe velocity of axonal impulse propagation is facilitated by myelination and axonal diameters. Both parameters are frequently impaired in peripheral nerve disorders, but it is not known if the diameters of myelinated axons affect the liability to injury or the efficiency of functional recovery. Mice lacking the adaxonal myelin protein chemokine‐like factor‐like MARVEL‐transmembrane domain‐containing family member‐6 (CMTM6) specifically from Schwann cells (SCs) display appropriate myelination but increased diameters of peripheral axons. Here we subjected Cmtm6‐cKo mice as a model of enlarged axonal diameters to a mild sciatic nerve compression injury that causes temporarily reduced axonal diameters but otherwise comparatively moderate pathology of the axon/myelin‐unit. Notably, both of these pathological features were worsened in Cmtm6‐cKo compared to genotype‐control mice early post‐injury. The increase of axonal diameters caused by CMTM6‐deficiency thus does not override their injury‐dependent decrease. Accordingly, we did not detect signs of improved regeneration or functional recovery after nerve compression in Cmtm6‐cKo mice; depleting CMTM6 in SCs is thus not a promising strategy toward enhanced recovery after nerve injury. Conversely, the exacerbated axonal damage in Cmtm6‐cKo nerves early post‐injury coincided with both enhanced immune response including foamy macrophages and SCs and transiently reduced grip strength. Our observations support the concept that larger peripheral axons are particularly susceptible toward mechanical trauma.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

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