D-Serine inhibits AMPA receptor-mediated current in rat hippocampal neurons.

Abstract:

:D-Serine, a recently identified gliotransmitter, serves as an endogenous coagonist binding to the glycine site of N-methyl-D-aspartate (NMDA) receptors. However, it is not clear whether this native ligand is able to bind to and modulate alpha-amino-3-hydroxyl-5-methyl-4-isoxazolepropionate (AMPA) receptors. In the present study, we showed that D-serine was able to concentration-dependently inhibit kainate-induced AMPA receptor-mediated current in acutely isolated hippocampal neurons. The blocking action of D-serine on AMPA receptors was characterized by a shift in concentration-response curve of kainate-induced current to the right with no change in the maximal response and independent of holding potential in the range of -80 to +60 mV. This is consistent with a model that D-serine is a competitive antagonist on AMPA receptors. In contrast, L-serine did not exert such an inhibitory action. Consistent with this observation, we found that several D-isoforms, but not L-isoforms, of endogenous and exogenous amino acids were able to block AMPA receptors. These results indicate that there is a low affinity and stereo-selective site at the agonist binding pocket of AMPA receptors for these D-amino acids. More importantly, vesicular-released endogenous D-serine from astrocytes could potentially modulate AMPA receptors in synaptic transmission in hippocampus.

authors

Gong XQ,Zabek RL,Bai D

doi

10.1139/y07-040

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

546-55

issue

5

eissn

0008-4212

issn

1205-7541

pii

y07-040

journal_volume

85

pub_type

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