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Related Experiment Videos

Nicotinic acetylcholine receptor-mediated synaptic potentials in rat neocortex.

Z G Chu1, F M Zhou, J J Hablitz

  • 1Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

Brain Research
|January 3, 2001
PubMed
Summary

Researchers found a novel excitatory postsynaptic current (EPSC) in neocortical pyramidal neurons resistant to standard antagonists. This suggests functional nicotinic acetylcholine receptors (nAChRs) are involved in fast excitatory synaptic transmission.

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Area of Science:

  • Neuroscience
  • Synaptic Physiology
  • Molecular Pharmacology

Background:

  • Fast excitatory synaptic transmission in the neocortex is typically mediated by excitatory amino acid (EAA) receptors.
  • Standard EAA receptor antagonists are commonly used to block these pathways.

Purpose of the Study:

  • To investigate the presence and characteristics of synaptic currents resistant to EAA receptor antagonists in neocortical pyramidal neurons.
  • To identify the potential receptor mechanisms underlying these resistant currents.

Main Methods:

  • Electrophysiological recordings (EPSCs) from layer II/III rat neocortical pyramidal neurons.
  • Application of EAA receptor antagonists (D-APV, CNQX, kynurenic acid) and GABA(A)-receptor antagonist (bicuculline).
  • Pharmacological manipulation using nicotinic acetylcholine receptor (nAChR) antagonists (DH beta E, mecamylamine) and acetylcholinesterase inhibitor (neostigmine).

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Main Results:

  • An EAA-antagonist resistant EPSC was observed in approximately 70% of tested neurons.
  • This EPSC exhibited a duration of ~20 ms, an amplitude of 61.5+/-6.8 pA at -70 mV, and a linear current-voltage relation reversing near 0 mV.
  • nAChR antagonists significantly reduced EPSC amplitude, indicating partial involvement of postsynaptic nAChRs.
  • The resistant EPSC persisted in the presence of antagonists for metabotropic glutamate, serotonergic (5-HT3), and purinergic (P2) receptors.

Conclusions:

  • A distinct excitatory postsynaptic current, resistant to conventional EAA receptor blockade, exists in rat neocortical pyramidal neurons.
  • This resistant current is, in part, mediated by the activation of postsynaptic nicotinic acetylcholine receptors (nAChRs).
  • These findings suggest the presence of functional synaptic nAChRs on neocortical pyramidal neurons, contributing to excitatory transmission.