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Tonic current through GABA A receptors and hyperpolarization‐activated cyclic nucleotide‐gated channels modulate resonance properties of rat subicular pyramidal neurons
Author(s) -
Sah Nirnath,
Sikdar Sujit K.
Publication year - 2014
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1111/ejn.12581
Subject(s) - neuroscience , tonic (physiology) , chemistry , subiculum , hyperpolarization (physics) , hippocampal formation , excitatory postsynaptic potential , electrophysiology , inhibitory postsynaptic potential , thalamus , biology , dentate gyrus , organic chemistry , nuclear magnetic resonance spectroscopy
The subiculum, considered to be the output structure of the hippocampus, modulates information flow from the hippocampus to various cortical and sub‐cortical areas such as the nucleus accumbens, lateral septal region, thalamus, nucleus gelatinosus, medial nucleus and mammillary nuclei. Tonic inhibitory current plays an important role in neuronal physiology and pathophysiology by modulating the electrophysiological properties of neurons. While the alterations of various electrical properties due to tonic inhibition have been studied in neurons from different regions, its influence on intrinsic subthreshold resonance in pyramidal excitatory neurons expressing hyperpolarization‐activated cyclic nucleotide‐gated ( HCN ) channels is not known. Using pharmacological agents, we show the involvement of α5βγ GABA A receptors in the picrotoxin‐sensitive tonic current in subicular pyramidal neurons. We further investigated the contribution of tonic conductance in regulating subthreshold electrophysiological properties using current clamp and dynamic clamp experiments. We demonstrate that tonic GABA ergic inhibition can actively modulate subthreshold properties, including resonance due to HCN channels, which can potentially alter the response dynamics of subicular pyramidal neurons in an oscillating neuronal network.