– Some studies have reported upregulated expression of certain GABA receptor subunits (e.g., GABA_A receptor subunits) in breast tumors.
– Increased expression has been associated with enhanced cell proliferation and migration, with some reports linking this to a poorer prognosis.
-GABAergic transmission is deficient in anxiety.
-Neurons expressing GABAA α1 receptors can mediate sedation,
-while those expressing GABAA α2 receptors mediate anxiolytic.
-In addition, extra-synaptic GABAA α5 receptors can also regulate the activity of hippocampal pyramidal cells, thereby affecting associative temporal and spatial memory
Gamma-aminobutyric acid — Gamma-aminobutyric acid is an endogenous non-protein amino acid, inhibitory neurotransmitter, metabolic intermediate, and signaling ligand commonly abbreviated GABA. As a database target, it represents changes in GABA concentration, synthesis, secretion, uptake, extracellular accumulation, or GABA-shunt utilization rather than modulation of a specific GABA receptor. GABA is synthesized from glutamate by GAD1/GAD67 and GAD2/GAD65, transported by GABA transporters, and metabolized primarily by ABAT/GABA transaminase. In cancer, GABA may be produced by tumor, neural, stromal, or immune cells and can influence proliferation, invasion, mitochondrial metabolism, β-catenin signaling, and antitumor immunity. Its biological direction is strongly tumor-, receptor-, concentration-, and compartment-dependent.
Typical cancer modulation: Variable/context-dependent. GABA production, secretion, extracellular accumulation, uptake, or GABA-shunt utilization may be ↑ in tumors that exploit GABA for metabolic adaptation, β-catenin activation, growth, invasion, or immune evasion. GABA signaling may instead suppress proliferation or migration in tumors expressing inhibitory GABA receptor configurations.
Normal-cell relevance: GABA generally reduces neuronal excitability through GABA receptor signaling and also regulates pancreatic, immune, gastrointestinal, vascular, and endocrine functions. In Alzheimer’s disease, reduced phasic inhibition and excessive astrocyte-derived tonic GABA may coexist in different circuits; therefore total GABA direction alone may not indicate whether GABAergic function is beneficial or pathological.
Target classification: Neurotransmitter; amino-acid metabolite; signaling ligand; tumor-microenvironment mediator; metabolic substrate.
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