Abstract
The reduction of glutamate content has been observed in the spinal cord of the wobbler mouse, a purported model of amyotrophic lateral sclerosis (ALS). To elucidate glutamate receptors in the wobbler spinal cord, we measured densities of N-methyl- d-aspartate (NMDA), kainate, α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) and metabotropic glutamate (mGlu) binding sites using in vitro autoradiography. In wobbler mice, NMDA, kainate, and AMPA binding sites were increased in the dorsal horn and kainate binding sites were also increased in the intermediate zone. However, mGlu binding was unchanged. These results disagree with those observed in ALS spinal cords, in which NMDA and kinate binding sites are decreased. The wobbler mouse may have the glutamate dysfunction, but in a different way from ALS.
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