Abstract：
INTRODUCTION:C2 spinal cord hemisection interrupts descending bulbospinal respiratory axons coursing through the cervical spinal cord. One consequence of this type of spinal cord injury is the partial deafferentation of the ipsilateral phrenic nucleus, which renders the hemidiaphragm paralysed. The biochemical properties of the intact or denervated locomotor skeletal muscles have been studied extensively, whereas the biochemical properties of the diaphragm after a cervical spinal cord injury received relatively little attention. This seems unfortunate, given that the diaphragm is the most important mammalian respiratory muscle and is the only skeletal muscle considered essential for survival. Therefore, the purpose of this work was to analyse the bioenergetic characteristics of the diaphragm following a cervical spinal cord injury. METHODS:Segments of the crural diaphragm from rat were homogenised to determine the activities of a glycolytic enzyme, lactate dehydrogenase (LDH), and a Krebs cycle enzyme, citrate synthase (CS). RESULTS:Data show a significant decrease of the CS activity on the ipsilateral hemidiaphragm to the cervical hemisection. No change in the LDH is observed between the animal without or with a cervical spinal cord injury. CONCLUSIONS:These data suggested that the CS activity could be dependent of the nervous influx from the central respiratory rhythm generator and that LDH activity could be maintained by a peripheral respiratory activity or by the cross phrenic phenomenon activation. Biochemical data should be considered in subjects presenting respiratory deficiency induced by a cervical spinal cord injury. Furthermore, the diaphragmatic muscle metabolic activity could be used to evaluate the functional respiratory recovery observed spontaneously or experimentally after using repair strategies of the spinal cord.
journal_name
Rev Mal Respirjournal_title
Revue des maladies respiratoiresauthors
Marqueste T,Decherchi Psubject
Has Abstractpub_date
2003-12-01 00:00:00pages
889-95issue
6 Pt 1eissn
0761-8425issn
1776-2588pii
MDOI-RMR-12-2003-20-6-0761-8425-101019-ART12journal_volume
20pub_type
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