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. 1995 Oct 10;92(21):9692–9696. doi: 10.1073/pnas.92.21.9692

Glutamate as a hippocampal neuron survival factor: an inherited defect in the trisomy 16 mouse.

L L Bambrick 1, P J Yarowsky 1, B K Krueger 1
PMCID: PMC40868  PMID: 7568199

Abstract

The survival of cultured mouse hippocampal neurons was found to be greatly enhanced by micromolar concentrations of the excitatory neurotransmitter glutamate. Blockade of kainate/AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) glutamate receptors increased the rate of neuron death, suggesting that endogenous glutamate in the cultures promotes survival. Addition of glutamate (0.5-1 microM) further increased neuron survival, whereas glutamate in excess of 20 microM resulted in increased death. Thus, the survival vs. glutamate dose-response relation is bell-shaped with an optimal glutamate concentration near 1 microM. We found that hippocampal neurons from mice with the genetic defect trisomy 16 (Ts16) died 2-3 times faster than normal (euploid) neurons. Moreover, glutamate, at all concentrations tested, failed to increase survival of Ts16 neurons. In contrast, the neurotrophic polypeptide basic fibroblast growth factor did increase the survival of Ts16 and euploid neurons. Ts16 is a naturally occurring mouse genetic abnormality, the human analog of which (Down syndrome) leads to altered brain development and Alzheimer disease. These results demonstrate that the Ts16 genotype confers a defect in the glutamate-mediated survival response of hippocampal neurons and that this defect can contribute to their accelerated death.

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Selected References

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