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α7nAchR/NMDAR coupling affects NMDAR function and object recognition.

Shupeng Li, Qiang Nai, Tatiana V Lipina

¹Department of Neuroscience, Centre for Addiction and Mental Health, Clarke Division, 250 College Street, Toronto, Ontario M5T 1R8, Canada. f.liu.a@utoronto.ca.

Molecular Brain

|December 24, 2013

Summary

This summary is machine-generated.

The interaction between alpha7 nicotinic acetylcholine receptors (α7nAChR) and NMDA glutamate receptors (NMDAR) influences NMDAR function. Disrupting this α7nAChR-NMDAR complex selectively impacts learning and memory.

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Area of Science:

Neuroscience
Molecular Biology
Pharmacology

Background:

Alpha-7 nicotinic acetylcholine receptors (α7nAChRs) and NMDA glutamate receptors (NMDARs) are crucial ion channels involved in neuronal signaling.
Previous research indicates functional crosstalk between α7nAChRs and NMDARs, but the underlying molecular mechanisms are not fully understood.
A protein-protein interaction between α7nAChR and NMDAR has been previously identified, forming a functional complex.

Purpose of the Study:

To investigate the role of the α7nAChR-NMDAR protein complex in the functional modulation of NMDAR activity by α7nAChR.
To determine if disrupting the α7nAChR-NMDAR interaction affects NMDAR-mediated currents and synaptic plasticity.
To assess the behavioral consequences of interfering with the α7nAChR-NMDAR complex in vivo.

Main Methods:

Electrophysiological recordings (whole-cell currents, mEPSC) in cultured hippocampal neurons.
Development and application of an interfering peptide to disrupt the α7nAChR-NMDAR complex.
Behavioral testing in mice, including novel object recognition and Morris water maze.

Main Results:

Activation of α7nAChR enhances NMDAR-mediated currents and long-term potentiation (LTP) of miniature excitatory postsynaptic currents (mEPSCs) in hippocampal neurons.
The observed upregulation of NMDAR function by α7nAChR activation was abolished by the interfering peptide.
In vivo administration of the interfering peptide impaired novel object recognition performance in mice, but did not affect Morris water maze performance.

Conclusions:

The α7nAChR-NMDAR interaction is critical for the functional modulation of NMDARs by α7nAChR.
α7nAChR/NMDAR coupling selectively influences specific aspects of learning and memory, as evidenced by impaired novel object recognition.
Targeting the α7nAChR-NMDAR complex may offer a novel therapeutic strategy for cognitive deficits associated with altered cholinergic and glutamatergic signaling.