Gamma-aminobutyric acid signaling pathway (GABA signaling)

The Gamma-aminobutyric acid (GABA) signaling pathway is the primary inhibitory neurotransmitter system in the mammalian central nervous system, essential for maintaining the balance of neuronal activity (StatPearls, 2023 [https://www.ncbi.nlm.nih.gov/books/NBK513311/]). It encompasses the synthesis of GABA from glutamate by glutamic acid decarboxylase (GAD), its vesicular release, and its interaction with two distinct receptor classes: the ionotropic GABA-A receptors and the metabotropic GABA-B receptors (Neuroscience, 2nd edition [https://www.ncbi.nlm.nih.gov/books/NBK10896/]). GABA-A receptors are ligand-gated chloride channels that mediate fast inhibitory postsynaptic potentials, while GABA-B receptors are G protein-coupled receptors that provide slower, prolonged inhibition by modulating potassium and calcium conductance (Frontiers in Molecular Neuroscience, 2012 [https://doi.org/10.3389/fnmol.2012.00098]). Dysregulation of this pathway is a hallmark of various neurological and psychiatric disorders, including epilepsy, anxiety, insomnia, and spasticity (Journal of Pharmacological Sciences, 2011 [https://doi.org/10.1254/jphs.11r05cp]). Pharmacological modulation of the GABA signaling pathway is a cornerstone of clinical neurology, utilizing positive allosteric modulators like benzodiazepines, direct agonists like baclofen, and inhibitors of GABA degradation or reuptake (Nature Reviews Drug Discovery, 2010 [https://doi.org/10.1038/nrd3132]). Despite their efficacy, therapeutic agents targeting this pathway often present challenges such as sedation, cognitive impairment, and the potential for tolerance or physical dependence (Molecular Pharmacology, 2021 [https://doi.org/10.1124/molpharm.120.000165]).

Other names

GABAergic systemGABAergic signalingGamma-aminobutyric acid neurotransmission

Drugs targeting this pathway primarily act through positive allosteric modulation of GABA-A receptors, direct agonism of GABA-B receptors, inhibition of the GABA-degrading enzyme GABA transaminase, or blockade of the GABA transporter GAT-1 (StatPearls, 2023 [https://www.ncbi.nlm.nih.gov/books/NBK513311/]).