Abstract:
:Respiratory motor output after cervical spinal cord injury (cSCI) is profoundly influenced by spinal serotonin. We hypothesized that intraspinal transplantation of embryonic midline brainstem (MB) cells rich in serotonergic raphé neurons would improve respiratory outcomes after cSCI. One week after hemisection of the 2nd cervical segment (C2Hx) a suspension of either embryonic (E14) MB cells, fetal spinal cord cells (FSC), or media only (sham) was delivered to the dorsal C3 spinal cord of adult male rats. Six weeks later, ventilation was evaluated using plethysmography; phrenic nerve activity was evaluated in a subset of rats. Seven of 12 rats receiving MB-derived grafts had clear histological evidence of serotonin-positive neurons in the C3-4 dorsal white matter. The transplantations had no impact on baseline breathing patterns, but during a brief respiratory challenge (7% inspired CO2) rats with successful MB grafts had increased ventilation compared to rats with failed MB grafts, FSC or sham grafts. Recordings from the phrenic nerve ipsilateral to C2Hx also indicated increased output during respiratory challenge in rats with successful MB grafts. We conclude that intraspinal allografting of E14 MB cells can have a positive impact on respiratory motor recovery following high cSCI.
journal_name
Exp Neuroljournal_title
Experimental neurologyauthors
Dougherty BJ,Gonzalez-Rothi EJ,Lee KZ,Ross HH,Reier PJ,Fuller DDdoi
10.1016/j.expneurol.2016.01.017subject
Has Abstractpub_date
2016-04-01 00:00:00pages
22-6eissn
0014-4886issn
1090-2430pii
S0014-4886(16)30016-4journal_volume
278pub_type
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