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Variation in hippocampal glial cell numbers in food-caching birds from different climates.
MedLine Citation:
PMID:  23382130     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Enhancements to memory are associated with enhanced neural structures that support those capabilities. A great deal of work has examined this relationship in the context of natural variation in spatial memory capability and hippocampal structure (hereafter Hp). Most studies have focused on volumetric and neuron measures, but have seldom examined the role of glial cells. Once considered only involved in supportive functions associated with neurons, the importance of glial cells in cognitive processes, including memory, is gaining more attention. Building upon our previous work on the relationship between the brain, memory, and environmental severity in food-caching birds, we compared the total number of Hp glial cells in wild-sampled and in lab-reared (common garden) black-capped chickadees (Poecile atricapillus) originating from two different environmental extremes. We found that birds from the more harsh climate tended to have significantly more Hp glial cells than those from the more mild climate and that lab-reared chickadees had significantly fewer Hp glial cells compared to the wild-sampled birds. These results suggest that population differences in glial numbers may be controlled, at least in part, by heritable mechanisms, but glial numbers appear to be additionally regulated by an individual's environment. The pattern of Hp glial cell abundance among our treatment groups closely followed that of the Hp volume, suggesting that Hp glial cell number may be associated with the Hp volume. Unlike hippocampal neurons, however, the number of Hp glial cells may be, at least in part, affected by an individual's experiences and environment.
Authors:
Timothy C Roth; Dominique M Chevalier; Lara D Ladage; Vladimir V Pravosudov
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-5
Journal Detail:
Title:  Developmental neurobiology     Volume:  -     ISSN:  1932-846X     ISO Abbreviation:  Dev Neurobiol     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101300215     Medline TA:  Dev Neurobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Wiley Periodicals, Inc., a Wiley company.
Affiliation:
Department of Psychology, Franklin and Marshall College, Lancaster, PA 17604, USA.
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