Rapid diaphragm atrophy following cervical spinal cord hemisection

L. C. Gill, H. H. Ross, K. Z. Lee, E. J. Gonzalez-Rothi, B. J. Dougherty, A. R. Judge, D. D. Fuller

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A cervical (C2) hemilesion (C2Hx), which disrupts ipsilateral bulbospinal inputs to the phrenic nucleus, was used to study diaphragm plasticity after acute spinal cord injury. We hypothesized that C2Hx would result in rapid atrophy of the ipsilateral hemidiaphragm and increases in mRNA expression of proteolytic biomarkers. Diaphragm tissue was harvested from male Sprague-Dawley rats at 1 or 7 days following C2Hx. Histological analysis demonstrated reduction in cross-sectional area (CSA) of type I and IIa fibers in the ipsilateral hemidiaphragm at 1 but not 7 days. Type IIb/x fibers, however, had reduced CSA at 1 and 7 days. A targeted gene array was used to screen mRNA changes for genes associated with skeletal muscle myopathy and myogenesis; this was followed by qRT-PCR validation. Changes in diaphragm gene expression suggested that profound myoplasticity is initiated immediately following C2Hx including activation of both proteolytic and myogenic pathways. We conclude that an immediate myoplastic response occurs in the diaphragm after C2Hx with atrophy occurring in ipsilateral myofibers within 1 day.

Original languageEnglish (US)
Pages (from-to)66-73
Number of pages8
JournalRespiratory Physiology and Neurobiology
Volume192
Issue number1
DOIs
StatePublished - Feb 1 2014

Bibliographical note

Funding Information:
We thank Dr. Ashley Smuder for comments on an earlier draft of this manuscript. This work was supported by NIH 1R01- HD-052682-01A1 (DDF). LCG was supported by an NIH T32 Training Grant ( HD043730 ).

Keywords

  • Atrophy
  • Diaphragm
  • Genes
  • Proteolysis
  • Spinal cord injury

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