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

• Authors: Kevin Erreger, Emory University; Stephen Traynelis, Emory University
• Journal Title: Journal of Physiology
• Volume: Volume 586, Number Pt 3
• Publisher: Wiley | 2008-02-01, Pages 763-778
• Type of Work: Article | Post-print: After Peer Review
• Publisher DOI: http://doi.org/10.1113/jphysiol.2007.143941
• Subjects: Health Sciences, Pharmacology; Biology, Physiology; Chemistry, General

Abstract

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.