GABA Regulation of Burst Firing in Hippocampal Astrocyte Neural Circuit: A Biophysical Model

Liu, Junxiu, McDaid, Liam, Araque, Alfonso, Wade, John, Harkin, Jim, Karim, Shvan, Henshall, David C., Connolly, Niamh M. C., Johnson, Anju P., Tyrrell, Andy M., Timmis, Jonathan, Millard, Alan G., Hilder, James and Halliday, David M. (2019) GABA Regulation of Burst Firing in Hippocampal Astrocyte Neural Circuit: A Biophysical Model. Frontiers in Cellular Neuroscience, 13. p. 335. ISSN 1662-5102

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Abstract

It is now widely accepted that glia cells and gamma-aminobutyric acidergic (GABA) interneurons dynamically regulate synaptic transmission and neuronal activity in time and space. This paper presents a biophysical model that captures the interaction between an astrocyte cell, a GABA interneuron and pre/postsynaptic neurons. Specifically, GABA released from a GABA interneuron triggers in astrocytes the release of calcium (Ca<sup>2+</sup>) from the endoplasmic reticulum via the inositol 1, 4, 5-trisphosphate (IP<sub>3</sub>) pathway. This results in gliotransmission which elevates the presynaptic transmission probability rate (PR) causing weight potentiation and a gradual increase in postsynaptic neuronal firing, that eventually stabilizes. However, by capturing the complex interactions between IP<sub>3</sub>, generated from both GABA and the 2-arachidonyl glycerol (2-AG) pathway, and PR, this paper shows that this interaction not only gives rise to an initial weight potentiation phase but also this phase is followed by postsynaptic bursting behavior. Moreover, the model will show that there is a presynaptic frequency range over which burst firing can occur. The proposed model offers a novel cellular level mechanism that may underpin both seizure-like activity and neuronal synchrony across different brain regions.

Item Type: Article
Subjects: Computing > Artificial Intelligence
Sciences > Biomedical Sciences
Divisions: Faculty of Technology > School of Computer Science
Depositing User: Jonathan Timmis
Date Deposited: 24 Mar 2020 14:02
Last Modified: 17 Jul 2020 13:42
URI: http://sure.sunderland.ac.uk/id/eprint/11851

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