Article thumbnail

Zinc inhibition of rat NR1/NR2A N-methyl-d-aspartate receptors

By Kevin Erreger and Stephen F Traynelis


Zinc ions (Zn2+) are localized in presynaptic vesicles at glutamatergic synapses and released in an activity-dependent manner. Modulation of NMDA-type glutamate receptors by extracellular Zn2+ may play an important role under physiological conditions and during pathologies such as ischaemia or seizure. Zn2+ inhibits NMDA receptors containing the NR2A subunit with an IC50 value in the low nanomolar concentration range. Here we investigate at the single-channel level the mechanism of high affinity Zn2+ inhibition of recombinant NR1/NR2A receptors expressed in HEK293 cells. Zn2+ reversibly decreases the mean single-channel open duration and channel open probability determined in excised outside-out patches, but has no effect on single-channel current amplitude. A parallel series of experiments demonstrates that lowering extracellular pH (increasing proton concentration) has a similar effect on NR1/NR2A single-channel properties as Zn2+. Fitting the sequence of single-channel events with kinetic models suggests that the association of Zn2+ with its binding site enhances proton binding. Modelling further suggests that protonated channels are capable of opening but with a lower open probability than unprotonated channels. These data and analyses are consistent with Zn2+-mediated inhibition of NMDA receptors primarily reflecting enhancement of proton inhibition

Topics: Neuroscience
Publisher: Blackwell Science Inc
OAI identifier:
Provided by: PubMed Central
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.pubmedcentral.nih.g... (external link)

  • To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.

    Suggested articles