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Elsevier, Brain Research, (1358), p. 11-19, 2010

DOI: 10.1016/j.brainres.2010.08.020

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Age-dependent modifications in the mRNA levels of the rat excitatory amino acid transporters (EAATs) at 48hour reperfusion following global ischemia

This paper is available in a repository.
This paper is available in a repository.

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Abstract

This study reports the mRNA levels of some excitatory amino acid transporters (EAATs) in response to ischemia-reperfusion (I/R) in rat hippocampus and cerebral cortex. The study was performed in 3-month-old and 18-month-old animals to analyze the possible role of age in the I/R response of these transporters. The I/R resulted in a reduced transcription of both the neuronal EAAC1 (excitatory amino acid carrier-1) and the neuronal and glial GLT-1 (glial glutamate transporter 1), while the glial GLAST1a (l-glutamate/l-aspartate transporter 1a) transcription increased following I/R. The changes observed were more striking in 3-month-old animals than in 18-month-old animals. We hypothesize that increases in the GLAST1a mRNA levels following I/R insult can be explained by increases in glial cells, while the GLT-1 response to I/R mirrors neuronal changes. GLAST1a transcription increases in 3-month-old animals support the hypothesis that this transporter would be the main mechanism for extracellular glutamate clearance after I/R. Decreases in EAAC1 and GLT-1 mRNA levels would represent either neuronal changes due to the delayed neuronal death or a putative protective down-regulation of these transporters to decrease the amount of glutamate inside the neurons, which would decrease their glutamate release. This study also reports how the treatment with the anti-inflammatory agent meloxicam attenuates the transcriptional response to I/R in 3-month-old rats and decreases the survival of the I/R-injured animals.