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A GABA reuptake inhibitor (GRI) is a type of drug which acts as a reuptake inhibitor for the neurotransmitter gamma-Aminobutyric acid (GABA) by blocking the action of the gamma-Aminobutyric acid transporters (GATs). This in turn leads to increased extracellular concentrations of GABA and therefore an increase in GABAergic neurotransmission. [1]
A GABAergic or GABAnergic agent is any chemical that modifies the effects of GABA in the body or brain. Some different classes of GABAergic drugs include agonists, antagonists, modulators, reuptake inhibitors and enzymes. [1]
DABA's main action is being an inhibitor of GABA transaminase, an enzyme that converts GABA back to glutamate. When the enzyme is inhibited, this conversion cannot happen, therefore, GABA levels are elevated. [1] It has also been observed that 2,4-diaminobutyric acid is a GABA reuptake inhibitor. [2] This action further elevates levels of GABA.
A subclass of ionotropic GABA receptors, insensitive to typical allosteric modulators of GABA A receptor channels such as benzodiazepines and barbiturates, [27] [28] [29] was designated GABA ะก receptor. [30] [31] Native responses of the GABA C receptor type occur in retinal bipolar or horizontal cells across vertebrate species. [32] [33] [34] [35]
The ionotropic GABA A receptor protein complex is also the molecular target of the benzodiazepine class of tranquilizer drugs. Benzodiazepines do not bind to the same receptor site on the protein complex as does the endogenous ligand GABA (whose binding site is located between α- and β-subunits), but bind to distinct benzodiazepine binding sites situated at the interface between the α- and ...
Gabapentin, sold under the brand name Neurontin among others, is an anticonvulsant medication primarily used to treat neuropathic pain and also for partial seizures [10] [7] of epilepsy. It is a commonly used medication for the treatment of neuropathic pain caused by diabetic neuropathy , postherpetic neuralgia , and central pain . [ 11 ]
The effect on sodium channels could be of particular relevance for seizure protection. Although topiramate does inhibit high-voltage-activated calcium channels, its relevance to clinical activity is uncertain. Effects on specific GABA-A receptor isoforms could also contribute to the antiseizure activity of the drug.
In general these drugs produce stimulant and convulsant effects, and are mainly used for counteracting overdoses of sedative drugs. Examples include bicuculline, securinine and metrazol, and the benzodiazepine GABA A receptor antagonist flumazenil. Other agents which may have GABA A receptor antagonism include the antibiotic ciprofloxacin, [1 ...