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Open Access Highly Accessed Research article

Chronic NMDA administration to rats increases brain pro-apoptotic factors while decreasing anti-Apoptotic factors and causes cell death

Hyung-Wook Kim, Yunyoung C Chang, Mei Chen, Stanley I Rapoport and Jagadeesh S Rao*

Author Affiliations

Brain Physiology and Metabolism Section, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892, USA

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BMC Neuroscience 2009, 10:123  doi:10.1186/1471-2202-10-123

Published: 28 September 2009

Abstract

Background

Chronic N-Methyl-D-aspartate (NMDA) administration to rats is reported to increase arachidonic acid signaling and upregulate neuroinflammatory markers in rat brain. These changes may damage brain cells. In this study, we determined if chronic NMDA administration (25 mg/kg i.p., 21 days) to rats would alter expression of pro- and anti-apoptotic factors in frontal cortex, compared with vehicle control.

Results

Using real time RT-PCR and Western blotting, chronic NMDA administration was shown to decrease mRNA and protein levels of anti-apoptotic markers Bcl-2 and BDNF, and of their transcription factor phospho-CREB in the cortex. Expression of pro-apoptotic Bax, Bad, and 14-3-3ΞΆ was increased, as well as Fluoro-Jade B (FJB) staining, a marker of neuronal loss.

Conclusion

This alteration in the balance between pro- and anti-apoptotic factors by chronic NMDA receptor activation in this animal model may contribute to neuronal loss, and further suggests that the model can be used to examine multiple processes involved in excitotoxicity.