Functional comparison of D-serine and glycine in rodents: the effect on cloned NMDA receptors and the extracellular concentration
- PMID: 7790891
- DOI: 10.1046/j.1471-4159.1995.65010454.x
Functional comparison of D-serine and glycine in rodents: the effect on cloned NMDA receptors and the extracellular concentration
Abstract
We compared the activity of free D-Ser on the potentiation of cloned NMDA receptors with that of Gly by using a Xenopus oocyte expression system. The extracellular concentration of free D-Ser and Gly was further studied by means of microdialysis. The ED50 values of D-Ser were three to four times lower than those of Gly in any combination of epsilon 1, epsilon 2, epsilon 3, or epsilon 4 and zeta 1. Site-directed mutagenesis of zeta 1 subunits revealed that some aromatic residues necessary for the action of Gly affected the ED50 value of D-Ser. This result showed that the residues play crucial roles in the action of D-Ser. In vivo microdialysis of rodent brain revealed that the extracellular concentration of free D-Ser in the frontal cortex (6.5 microM) was high enough to saturate the Gly site on the NMDA receptor, but that in the cerebellum was not. These findings suggest that D-Ser is a candidate of the endogenous potentiator of the NMDA receptor in the rodent frontal cortex.
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