Document Detail


Estrogen is not neuroprotective in a rodent model of optic nerve stroke.
MedLine Citation:
PMID:  17982415     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Nonarteritic anterior ischemic optic neuropathy (NAION) is an optic nerve (ON) infarct of retinal ganglion cell (RGC) axons, and the most common cause of ON-related sudden vision loss. Estrogen has been previously proposed as a neuroprotective treatment for central nervous system ischemia. We evaluated estrogen's potential in post-ON infarct treatment to reduce neuronal loss following a model of NAION, rodent anterior ischemic optic neuropathy (rAION). METHODS: We used the rat rAION model, coupled to array and northern analyses, to evaluate estrogen-associated, early post-infarct retinal gene expression changes. rAION was induced in ovariectomized female rats, which were then treated with either estrogen or vehicle. Stereological analysis of post-rAION RGC numbers was performed, using retrograde RGC fill-labeling with fluorogold. RESULTS: rAION induces an early increase in estrogen expressed transcript-1 (EET-1), but EET-1 expression is not affected by systemic estrogen pretreatment. Post-rAION, there is no significant increase in RGC numbers in estrogen treated animals compared with vehicle-treated controls. Estrogen treatment following stroke does not increase preservation of ON structure, compared with vehicle controls. CONCLUSIONS: While the rAION-axonal stroke model is a useful adjunct for evaluating potential AION neuroprotective treatments, post-stroke estrogen administration does not appear neuroprotective in this form of central nervous system insult. Similarly, estrogen is likely to be ineffective in improving ON structural integrity following an ischemic infarct.
Authors:
Steven L Bernstein; Zara Mehrabyan; Yan Guo; Nima Moianie
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2007-10-09
Journal Detail:
Title:  Molecular vision     Volume:  13     ISSN:  1090-0535     ISO Abbreviation:  Mol. Vis.     Publication Date:  2007  
Date Detail:
Created Date:  2007-11-05     Completed Date:  2007-12-06     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  9605351     Medline TA:  Mol Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1920-5     Citation Subset:  IM    
Affiliation:
Department of Ophthalmology, University of Maryland School of Medicine, Baltimore, MD 21201, USA. slbernst@umaryland.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Count
Estrogens / pharmacology*
Female
Fluorescent Dyes
Infarction / etiology*,  pathology*
Neuroprotective Agents / pharmacology*
Optic Neuropathy, Ischemic / complications*
Ovariectomy
Rats
Rats, Sprague-Dawley
Retina / metabolism,  pathology
Retinal Ganglion Cells / drug effects,  pathology
Stilbamidines
Grant Support
ID/Acronym/Agency:
R01-EY015304/EY/NEI NIH HHS
Chemical
Reg. No./Substance:
0/2-hydroxy-4,4'-diamidinostilbene, methanesulfonate salt; 0/Estrogens; 0/Fluorescent Dyes; 0/Neuroprotective Agents; 0/Stilbamidines
Comments/Corrections

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