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Protective effect of low molecular weight polyethylene glycol on the repair of experimentally damaged neural membranes in rat's spinal cord.
MedLine Citation:
PMID:  23540410     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: Membrane disruption is one of the main factors that cause axonal damage and functional deficits manifested in spinal cord injury (SCI). In this study, we used polyethylene glycol (PEG) to induce immediate membrane sealing and to promote functional recovery after SCI.
METHODS: The effects of PEG (200-2000 Da) on the damaged membrane were monitored by means of spinal cord evoked potentials (SCEPs) in an SCI model in rats. In a parallel study, membranes of neural cells were mechanically damaged in culture by ultrasound waves (20 kHz) and the repairing effects of PEGs were examined afterwards at the single cell level.
RESULTS: Analysis of SCEPs showed that the smaller the PEG, the higher was the ultimate recovery of SCEP (i.e. 200 Da caused 49·5% and 2000 Da up to 16·3%). The rate of recovery was maximum with a polynomial trend, when the damaged spinal cord was treated with PEG200 for 25 minutes. The analysis of survival rate of mechanically damaged cells in culture, measured by MTT assay, showed that again smaller PEGs, caused higher membrane sealing rate; 77·8±3·5 for PEG400 (20% w/w) vs 32·1±6·9 for PEG2000 (20% w/w). The large ones (PEG1000 and 2000) that presented minor repair at low concentration, showed no significant sealing effects at high concentrations (>50%).
CONCLUSION: Our studies showed that the application of low molecular weight PEGs, (<50% w/w) can be considered as one of the effective early treatments for SCI.
Sogolie Kouhzaei; Iman Rad; Sara Mousavidoust; Hamid Mobasheri
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neurological research     Volume:  35     ISSN:  1743-1328     ISO Abbreviation:  Neurol. Res.     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-04-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7905298     Medline TA:  Neurol Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  415-23     Citation Subset:  IM    
University of Tehran, Tehran, Iran.
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