Volume 56, Issue 6 pp. E108-E118
Basic Science Research

Electrical stimulation delays reinnervation in denervated rat muscle

Clara M. Pinheiro-Dardis PhD

Clara M. Pinheiro-Dardis PhD

Fisioterapia Neurológica (LaFiN), Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luis, Km 235, C.P. 676 – CEP: 13565-905, São Carlos, SP, Brazil

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Bruna T. Erbereli PT

Bruna T. Erbereli PT

Fisioterapia Neurológica (LaFiN), Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luis, Km 235, C.P. 676 – CEP: 13565-905, São Carlos, SP, Brazil

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Davilene Gigo-Benato PhD

Davilene Gigo-Benato PhD

Fisioterapia Neurológica (LaFiN), Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luis, Km 235, C.P. 676 – CEP: 13565-905, São Carlos, SP, Brazil

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Paula A.T.S. Castro PhD

Paula A.T.S. Castro PhD

Laboratory of Muscle Plasticity, DFisio, UFSCar, São Carlos, São Paulo, Brazil

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Thiago L. Russo PhD

Corresponding Author

Thiago L. Russo PhD

Fisioterapia Neurológica (LaFiN), Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luis, Km 235, C.P. 676 – CEP: 13565-905, São Carlos, SP, Brazil

Correspondence to: T. L. Russo; e-mail: [email protected]Search for more papers by this author
First published: 24 January 2017
Citations: 12

Funding: This study was supported by FAPESP (2013/21321-6) and CAPES.

Conflicts of Interest: None of the authors has any conflict of interest to disclose.

ABSTRACT

Introduction

It is not clear if electrical stimulation (ES) can affect muscle reinnervation. This study aimed to verify if ES affects neuromuscular recovery after nerve crush injury in rats.

Methods

Denervated muscles were electrically stimulated daily for 6 or 14 days. Neuromuscular performance and excitability, and muscle morphology were determined. Muscle trophism markers (atrogin-1, MuRF-1, and myoD), as well as neuromuscular junction (NMJ) organization (muscle-specific receptor tyrosine kinase [MuSK], cytoplasmic protein downstream of kinase-7 [Dok-7], nicotinic ACh receptor [nAChR], and neural cell adhesion molecule [N-CAM]) were assessed.

Results

ES impaired neuromuscular recovery at day 14 postdenervation. Muscle hypoexcitability was accentuated by ES at 6 and 14 days postdenervation. Although ES reduced the accumulation of atrogin-1, MuRF1, and myoD mRNAs, it increased muscle atrophy. Gene expression of MuSK, Dok-7, nAChR, and the content of N-CAM protein were altered by ES.

Discussion

ES can delay the reinnervation process by modulating factors related to NMJ stability and organization, and inducing dysfunction, hypoexcitability, and muscle atrophy. Muscle Nerve 56: E108–E118, 2017

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