Glutamatergic and GABAergic neurotransmitter systems

The **glutamatergic and GABAergic neurotransmitter systems** are the fundamental excitatory and inhibitory signaling networks in the mammalian brain. **Glutamatergic neurons** release *glutamate*, which activates ionotropic (NMDA, AMPA, kainate) and metabotropic (mGluR1-8) glutamate receptors, promoting neuronal excitation involved in learning, memory, and overall CNS function. **GABAergic neurons** release *gamma-aminobutyric acid (GABA)*, binding to ionotropic (GABA(A)) and metabotropic (GABA(B)) receptors to inhibit neuronal activity and provide essential brake on excitability; GABA is synthetized from glutamate via glutamate decarboxylase. Balanced interplay between these systems is essential for brain homeostasis, and disturbances contribute to a wide range of neurologic and psychiatric disorders. Both systems encompass numerous receptors, transporters, and metabolic enzymes, many of which represent individual therapeutic targets. However, the label "Glutamatergic and GABAergic neurotransmitter systems" as a collective descriptor is not a single druggable target but rather a conceptual framework encompassing complementary molecular entities.

Other names

Glutamatergic systemGABAergic systemExcitatory and inhibitory neurotransmitter systems

Allosteric modulation of receptor function (e.g., benzodiazepines at GABA(A)); Direct agonism or antagonism of ion channels (e.g., NMDA receptor antagonists); Inhibition of neurotransmitter degradation (e.g., vigabatrin inhibits GABA transaminase); Alteration of neurotransmitter reuptake/transport (e.g., affecting EAATs or GABA transporters)