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The Journal of Physiology
Article . 2006 . Peer-reviewed
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Functional somato‐dendritic α7‐containing nicotinic acetylcholine receptors in the rat basolateral amygdala complex

Authors: Rebecca C, Klein; Jerrel L, Yakel;

Functional somato‐dendritic α7‐containing nicotinic acetylcholine receptors in the rat basolateral amygdala complex

Abstract

Multiple subtypes of nicotinic acetylcholine receptors (nAChRs) are expressed in the CNS. The amygdala complex, the limbic structure important for emotional memory formation, receives cholinergic innervation from the basal forebrain. Although cholinergic drugs have been shown to regulate passive avoidance performance via the amygdala, the neuronal subtypes and circuits involved in this regulation are unknown. In the present study, whole‐cell patch‐clamp electrophysiological techniques were used to identify and characterize the presence of functional somato‐dendritic nAChRs within the basolateral complex of the amygdala. Pressure‐application of acetylcholine (ACh; 2 mm) evoked inward current responses in a subset of neurons from both the lateral (49%) and basolateral nuclei (72%). All responses displayed rapid activation kinetics, and were blocked by the α7‐selective antagonist methyllycaconitine. In addition, the α7‐selective agonist choline induced inward current responses that were similar to ACh‐evoked responses. Spiking patterns were consistent with pyramidal class I neurons (the major neuronal type in the basolateral complex); however, there was no correlation between firing frequency and the response to ACh. The local photolysis of caged carbachol demonstrated that the functional expression of nAChRs is located both on the soma and dendrites. This is the first report demonstrating the presence of functional nAChR‐mediated current responses from rat amygdala slices, where they may be playing a significant role in fear and aversively motivated memory.

Keywords

Neurons, Patch-Clamp Techniques, Photolysis, alpha7 Nicotinic Acetylcholine Receptor, Aconitine, Cholinergic Agents, Action Potentials, Dendritic Cells, Fear, Nicotinic Antagonists, Receptors, Nicotinic, Amygdala, Acetylcholine, Choline, Rats, Gene Expression Regulation, Memory, Animals, Carbachol, Evoked Potentials

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
51
Top 10%
Top 10%
Top 10%
bronze