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The Journal of Neuroscience, August 15, 1999, 19(16):6844-6854
Subtype-Dependence of NMDA Receptor Channel Open Probability
Nansheng Chen1, Tao Luo1, and Lynn A. Raymond1, 2, 3 1 Kinsmen Laboratory of Neurological Research,
Department of Psychiatry, 2 Department of Physiology, and 3 Division of Neurology, Department of Medicine, University of British Columbia, Vancouver, British Columbia V6T 1Z3 Canada NMDA receptor-mediated calcium transients play a critical role in synaptogenesis, synaptic plasticity, and excitotoxicity. NMDA receptors are heteromeric complexes of NR1A combined with NR2A, NR2B, NR2C, and/or NR2D subunits. The NR2 subunits determine a variety of electrophysiological and pharmacological properties of the NMDA receptor complex. In this report, we provide evidence for the first time that there is also a significant difference in peak channel open probability (Po) between NMDA receptors composed of NR1A/NR2A and those of NR1A/NR2B subunits. First, whole-cell patch-clamp recordings from human embryonic kidney (HEK) 293 cells expressing NMDA receptors revealed that NR1A/NR2A-mediated peak current densities are approximately four times larger than those of NR1A/NR2B. We show that this fourfold difference is unlikely caused by differences in receptor surface expression, since these levels were similar for the two subtypes by Western blot analysis. To determine whether Po contributed to the difference in peak current densities, we used two different open channel antagonists, MK-801 and 9-aminoacridine, in a variety of experimental paradigms. Our results indicate that peak Po is significantly higher (twofold to fivefold) for NR1A/NR2A than NR1A/NR2B, with estimated values of ~0.35 and 0.07, respectively. These results suggest that a change in the relative expression levels of NR2A and NR2B can regulate peak amplitude of NMDA receptor-mediated excitatory postsynaptic potentials and therefore may play a role in mechanisms underlying synaptic plasticity.
Key words: patch-clamp recording; transient transfection; recombinant receptors; use-dependent block; tail current; charge transfer
Copyright © 1999 Society for Neuroscience 0270-6474/99/19166844-11$05.00/0
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