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Excitatory transmission in the basolateral amygdala.
D G Rainnie1, E K Asprodini, P Shinnick-Gallagher
1Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston 77550.
Journal of Neurophysiology
|September 1, 1991
Summary
This study reveals distinct glutamatergic receptor roles in amygdala circuits. Non-NMDA and NMDA receptors mediate fast and slow excitatory postsynaptic potentials, respectively, influencing synaptic efficacy.
Area of Science:
- Neuroscience
- Molecular Biology
- Electrophysiology
Background:
- The basolateral nucleus of the amygdala (BLA) plays a crucial role in emotional processing.
- Understanding the synaptic mechanisms within the BLA is essential for deciphering fear and anxiety circuits.
Purpose of the Study:
- To characterize postsynaptic potentials in BLA neurons.
- To elucidate the contribution of glutamatergic receptor subtypes to excitatory postsynaptic potentials (EPSPs) elicited by stria terminalis (ST) or lateral amygdala (LA) stimulation.
Main Methods:
- Intracellular current-clamp recordings from BLA neurons.
- Pharmacological analysis using NMDA (DL)-2-amino-5-phosphonovaleric acid (APV) and non-NMDA (6-cyano-7-nitro-quinoxaline-2,3-dione, CNQX) receptor antagonists.
- Analysis of basic membrane properties and postsynaptic potentials.
Main Results:
- BLA neurons exhibit intrinsic regulation of synaptic efficacy.
- EPSPs consist of dual fast (non-NMDA mediated) and slow (NMDA mediated) components.
- Inhibitory postsynaptic potentials can influence EPSP amplitude and duration, suggesting shunting inhibition.
Conclusions:
- Distinct glutamatergic receptor subtypes mediate fast and slow EPSPs in the BLA.
- Synaptic transmission in the BLA is modulated by intrinsic neuronal properties and interactions between excitatory and inhibitory inputs.
- Pharmacological agents like CNQX and APV suggest tonic excitatory amino acid release and feed-forward inhibition within the BLA.