While the etiology of depressive disorders is multifactorial, spanning diverse polygenic
origins and environmental exposures, its impact on an aberrant cortical inhibition-excitation
balance is one of the final common pathophysiological processes [
1
,
2
,
3
]. Gamma-aminobutyric acid (GABA) – an abundant inhibitory neurotransmitter in the
nervous system, along with glutamate – an excitatory neurotransmitter, is vital in
maintaining an optimal balance required for healthy brain functions. One of the contributing
factors to the cortical excitation-inhibition imbalance in depression is GABAergic
dysfunction [
[4]
]. This is evident from observations of significantly lower cerebrospinal fluid GABA
levels [
[5]
], reduced magnetic resonance spectroscopy-measured GABA concentrations in the anterior
cingulate [
[6]
], and reduced Transcranial Magnetic Stimulation (TMS)-measured short interval intracortical
inhibition – a measure of GABAA neurotransmission and cortical silent period – a measure of GABAB neurotransmission – in the motor cortex of patients with depressive disorders [
[7]
].- Radhu N.
- de Jesus D.R.
- Ravindran L.N.
- Zanjani A.
- Fitzgerald P.B.
- Daskalakis Z.J.
A meta-analysis of cortical inhibition and excitability using transcranial magnetic
stimulation in psychiatric disorders.
Clin Neurophysiol Off J Int Fed Clin Neurophysiol. 2013; 124: 1309-1320https://doi.org/10.1016/j.clinph.2013.01.014
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Article Info
Publication History
Published online: August 02, 2019
Accepted:
July 31,
2019
Received in revised form:
July 25,
2019
Received:
June 23,
2019
Identification
Copyright
© 2019 Elsevier Inc. All rights reserved.