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Long-term effects of early life deprivation on brain glia in Fischer rats


Leventopoulos, M; Rüedi-Bettschen, D; Knuesel, I; Feldon, J; Pryce, C R; Opacka-Juffry, J (2007). Long-term effects of early life deprivation on brain glia in Fischer rats. Brain Research, 1142:119-126.

Abstract

Both clinical and experimental studies have indicated that depression and depression-like animal conditions are associated with disruption of the intrinsic plasticity of the brain, resulting in neuronal atrophy. However, little is known about the brain glia in these conditions. Early life stress in the form of infant abuse or neglect constitutes a risk factor in the aetiology of major depressive disorder in later life. It is possible to model this relation between early life stress and depression in the rat through maternal deprivation; in adulthood, this postnatal manipulation is known to lead to depression-like behaviour. In the stress-hyperresponsive Fischer strain, P1-14 pups were isolated for 4 h/day (early deprivation, ED, n=6) or were nonhandled (NH, n=6); they were left undisturbed until adulthood. Postmortem quantitative analysis of regional astroglial distribution and morphology based on glial fibrillary acidic protein (GFAP) immunohistochemistry indicated a significant effect of ED on the density of GFAP-reactive astrocytes in brain areas implicated in stress-related behaviour. A moderate (10-22%) but consistent reduction in GFAP-reactive astrocyte density was seen in dorsal dentate gyrus, prefrontal cortex, ventral hippocampal CA1, cingulate cortex, dorsal hippocampal CA1 and basolateral amygdala. The ED-related reduction in GFAP-immunoreactive astrocyte density was more marked than the reduction in total cell density, which suggests that GFAP immunoreactivity, rather than the number of astrocytes, was reduced. This study provides evidence that early life stress leads to long-term changes in the density of astroglia in the brain regions involved in stress responses in the rat.

Both clinical and experimental studies have indicated that depression and depression-like animal conditions are associated with disruption of the intrinsic plasticity of the brain, resulting in neuronal atrophy. However, little is known about the brain glia in these conditions. Early life stress in the form of infant abuse or neglect constitutes a risk factor in the aetiology of major depressive disorder in later life. It is possible to model this relation between early life stress and depression in the rat through maternal deprivation; in adulthood, this postnatal manipulation is known to lead to depression-like behaviour. In the stress-hyperresponsive Fischer strain, P1-14 pups were isolated for 4 h/day (early deprivation, ED, n=6) or were nonhandled (NH, n=6); they were left undisturbed until adulthood. Postmortem quantitative analysis of regional astroglial distribution and morphology based on glial fibrillary acidic protein (GFAP) immunohistochemistry indicated a significant effect of ED on the density of GFAP-reactive astrocytes in brain areas implicated in stress-related behaviour. A moderate (10-22%) but consistent reduction in GFAP-reactive astrocyte density was seen in dorsal dentate gyrus, prefrontal cortex, ventral hippocampal CA1, cingulate cortex, dorsal hippocampal CA1 and basolateral amygdala. The ED-related reduction in GFAP-immunoreactive astrocyte density was more marked than the reduction in total cell density, which suggests that GFAP immunoreactivity, rather than the number of astrocytes, was reduced. This study provides evidence that early life stress leads to long-term changes in the density of astroglia in the brain regions involved in stress responses in the rat.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Pharmacology and Toxicology
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:20 April 2007
Deposited On:07 Oct 2009 12:24
Last Modified:05 Apr 2016 13:22
Publisher:Elsevier
ISSN:0006-8993
Publisher DOI:10.1016/j.brainres.2007.01.039
PubMed ID:17306230
Permanent URL: http://doi.org/10.5167/uzh-21087

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