Acid-sensing ion channels differentially affect ictal-like and non-ictal-like epileptic activities of mouse hippocampal pyramidal neurons in acidotic extracellular pH.
10.12122/j.issn.1673-4254.2020.07.09
- Author:
Shuai LIU
1
;
Rongqing CHEN
1
Author Information
1. Department of Neurobiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China.
- Publication Type:Journal Article
- Keywords:
ASICs;
acid-sensitive ion channels;
epilepsy;
extracellular acidosis;
field potential recording
- MeSH:
Acid Sensing Ion Channels;
Acidosis;
Animals;
Hippocampus;
Hydrogen-Ion Concentration;
Mice;
Pyramidal Cells
- From:
Journal of Southern Medical University
2020;40(7):972-980
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To investigate the effects of acid-sensing ion channels (ASICs) on electrophysiological epileptic activities of mouse hippocampal pyramidal neurons in the extracellular acidotic condition.
METHODS:We investigated effects of extracellular acidosis on epileptic activities induced by elevated extracellular K concentration or the application of an antagonist of GABA receptors in perfusate of mouse hippocampal slices under field potential recordings. We also tested the effects of extracellular acidosis on neuronal excitability under field potential recording and evaluated the changes in epileptic activities of the neurons in response to pharmacological inhibition of ASICs using a specific inhibitor of ASICs.
RESULTS:Extracellular acidosis significantly suppressed epileptic activities of the hippocampal neurons by converting ictal-like epileptic activities to non-ictal-like epileptic activities in both high [K ]o and disinhibition models, and also suppressed the intrinsic excitability of the neurons. ASICs inhibitor did not antagonize the inhibitory effect of extracellular acidosis on ictal epileptic activities and intrinsic neuronal excitability, but exacerbated non-ictal epileptic activities of the neurons in extracellular acidotic condition in both high [K]o and disinhibition models.
CONCLUSIONS:ASICs can differentially modulate ictal-like and non-ictallike epileptic activities via its direct actions on excitatory neurons.
