Aging exacerbates intracerebral hemorrhage-induced brain injury.

Abstract:

:Aging may be an important factor affecting brain injury by intracerebral hemorrhage (ICH). In the present study, we investigated the responses of glial cells and monocytes to intracerebral hemorrhage in normal and aged rats. ICH was induced by microinjecting autologous whole blood (15 microL) into the striatum of young (4 month old) and aged (24 month old) Sprague-Dawley rats. Age-dependent relations of brain tissue damage with glial and macrophageal responses were evaluated. Three days after ICH, activated microglia/macrophages with OX42-positive processes and swollen cytoplasm were more abundantly distributed around and inside the hemorrhagic lesions. These were more dramatic in aged versus the young rats. Western blot and immunohistochemistry analyses showed that the expression of interleukin-1beta protein after ICH was greater in aged rats, whereas the expression of GFAP and ciliary neurotrophic factor protein after ICH was significantly lower in aged rats. These results suggest that ICH causes more severe brain injury in aged rats most likely due to overactivation of microglia/macrophages and concomitant repression of reactive astrocytes.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Lee JC,Cho GS,Choi BO,Kim HC,Kim WK

doi

10.1089/neu.2008.0630

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

1567-76

issue

9

eissn

0897-7151

issn

1557-9042

journal_volume

26

pub_type

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