Elsevier

Brain Research

Volume 1018, Issue 1, 20 August 2004, Pages 141-146
Brain Research

Short communication
Age-related changes in erythropoietin immunoreactivity in the cerebral cortex and hippocampus of rats

https://doi.org/10.1016/j.brainres.2004.05.078Get rights and content

Abstract

Although oxidative stress may influence the fluid properties of blood, resulting in a potential decrement in blood flow and oxygen delivery to the brain during aging, very little is known about age-related changes in Epo expression. Therefore, we examined age-related changes in Epo expression in the cerebral cortex and hippocampus with an immunohistochemical technique. In aged rats, there was a significant decrease in Epo immunoreactivity in the pyramidal cells in the cortical regions. In the hippocampus of adult rats, a distinct immunoreactivity pattern was observed in the CA1-3 areas and dentate gyrus. In aged hippocampus, Epo immunoreactivity was significantly deceased in the pyramidal layer of CA1 regions, and the granule cell layer of dentate gyrus. It was noted that there was distinct pattern of Epo immunoreactivity in the pyramidal layer of CA2–CA3 region of aged rats. Epo immunoreactivity was relatively strong, but was observed only in the periphery of the cytoplasm. The first demonstration of age-related decreases in Epo expression in the cerebral cortex and hippocampus may provide useful data for investigating the pathogenesis of age-related neurodegenerative diseases, suggesting that age-related decreases in Epo may contribute to degenerative events following age-related decreases in brain flow and oxygen supply.

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Acknowledgements

This work was supported by Korean Ministry of Health and Welfare Research Foundation Grant (0405-NS01-0704-0001). This study was supported in part by year 2004 BK21 project for Medicine, Dentistry and Pharmacy.

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