Botulinum Toxin Conditioning Enhances Motor Axon Regeneration in Mouse and Human Preclinical Models.

Abstract:

BACKGROUND:Peripheral axon regeneration is improved when the nerve lesion under consideration has recently been preceded by another nerve injury. This is known as the conditioning lesion effect (CLE). While the CLE is one of the most robust and well characterized means to enhance motor axon regeneration in experimental models, it is not considered a clinically feasible strategy. A pharmacological means to re-produce the CLE is highly desirable. OBJECTIVE:To test whether chemodenervation with a clinical grade formulation of botulinum toxin A (BoTX) would be sufficient to reproduce the CLE. METHODS:We examined the effects of a 1-week preconditioning administration of BoTX on motor axon regrowth in both a mouse tibial nerve injury and human embryonic stem cell (hESC)-based model. We assessed neuronal reinnervation in vivo (mice) with retrograde tracers and histological analysis of peripheral nerve tissue after injections into the triceps surae muscle group. We assessed motor neuron neurite outgrowth in vitro (hESC) after incubation in BoTX by immunohistochemistry and morphometric analysis. RESULTS:We found that BoTX conditioning treatment significantly enhanced outgrowth of both murine motor axons in vivo and human MN neurites in vitro. CONCLUSIONS:BoTX preconditioning represents a pharmacological candidate approach to enhance motor axon regeneration in specific clinical scenarios such as nerve transfer surgery. Further studies are needed to elucidate the molecular mechanism.

authors

Franz CK,Puritz A,Jordan LA,Chow J,Ortega JA,Kiskinis E,Heckman CJ

doi

10.1177/1545968318790020

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

735-745

issue

8

eissn

1545-9683

issn

1552-6844

journal_volume

32

pub_type

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