Document Detail

Experimental pediatric arterial ischemic stroke model reveals sex-specific estrogen signaling.
MedLine Citation:
PMID:  23349190     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND PURPOSE: Pediatric stroke, birth to 18 years, is a significant cause of long-term disability in the United States; however, there is currently little experimental data on the pathophysiology of childhood stroke owing to lack of animal models. We developed a novel mouse model of experimental childhood-onset arterial ischemic stroke to characterize the sex-specific response of the adolescent brain to cerebral ischemia and assess the neuroprotective effect of estrogen at this developmental stage.
METHODS: Postnatal day 20 to 25 mice were subjected to 90 minutes experimental stroke via the intraluminal filament middle cerebral artery occlusion model and ischemic damage assessed 22 hours after reperfusion. Real-time quantitative real-time polymerase chain reaction was performed 22 hours after middle cerebral artery occlusion to determine the effects of ischemia and estrogen treatment on the proapoptotic gene Bax.
RESULTS: Ischemic injury did not differ between male and female juvenile (postnatal day 20-25) mice after middle cerebral artery occlusion. However, estrogen reduced ischemic injury in female mice, whereas having no effect in juvenile males. No differences in estrogen receptor expression were observed on postnatal day between 20 males and females. In contrast, estrogen minimized the ischemia-induced increase in the proapoptotic gene Bax in female mice, whereas having no effect on Bax induction in the male brain.
CONCLUSIONS: Focal ischemia has fundamentally different effects in the juvenile brain compared with the adult, as evidenced by the lack of sex difference in ischemic injury in the murine postnatal day 20 to 25 middle cerebral artery occlusion model and the sexually dimorphic response to estrogen neuroprotection.
Paco S Herson; Chris G Bombardier; Susan M Parker; Takeru Shimizu; Jost Klawitter; Jelena Klawitter; Nidia Quillinan; Jennifer L Exo; Neil A Goldenberg; Richard J Traystman
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2013-01-24
Journal Detail:
Title:  Stroke; a journal of cerebral circulation     Volume:  44     ISSN:  1524-4628     ISO Abbreviation:  Stroke     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-02-26     Completed Date:  2013-06-20     Revised Date:  2014-03-19    
Medline Journal Info:
Nlm Unique ID:  0235266     Medline TA:  Stroke     Country:  United States    
Other Details:
Languages:  eng     Pagination:  759-63     Citation Subset:  IM    
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MeSH Terms
Aging / physiology*
Brain / drug effects,  metabolism,  physiopathology
Estrogens / pharmacology,  physiology*
Gene Expression Regulation, Developmental / drug effects
Infarction, Middle Cerebral Artery / complications
Mice, Inbred C57BL
Models, Animal*
Neuroprotective Agents / pharmacology
Sex Characteristics*
Signal Transduction / drug effects,  physiology*
Stroke / etiology,  physiopathology*,  prevention & control
bcl-2-Associated X Protein / metabolism
Grant Support
Reg. No./Substance:
0/Estrogens; 0/Neuroprotective Agents; 0/bcl-2-Associated X Protein

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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