GABA Receptor Inhibitor

Basmisanil (RG1662) is a highly selective orally active α subunit-containing GABAA receptors (GABAAα5) negative allosteric modulator (NAMs). Basmisanil can inhibit GABAA-α5 with a K_i value of 5 nM and IC₅₀ value of 8 nM, respectively. Basmisanil can be used for the research of multiple cognitive and psychiatric disorders.

BPDBA is a selective and noncompetitive betaine/GABA transporter (BGT-1) inhibitor with IC₅₀s of 20 μM and 35 μM against human BGT-1 and mouse GAT2, respectively.

Tiagabine (NO050328; NO328; TGB) is an orally active, highly selective, and reversible GAT-1 inhibitor and anticonvulsant that crosses the blood-brain barrier. By blocking the reuptake of GABA in neurons and glial cells, tiagabine increases extracellular GABA levels to enhance inhibitory signal transduction, thereby exerting multiple activities such as anticonvulsant, neuroprotective, and antioxidant effects. Tiagabine exhibits linear pharmacokinetic properties. Although it is metabolized by CYP3A and has a high protein binding rate, it carries a low risk of cognitive impairment. Tiagabine is widely used in research on related diseases including epilepsy (including refractory partial seizures), alcohol withdrawal symptoms, and Huntington's disease.

Guvacine hydrochloride is an alkaloid from the nut of Areca catechu, acts as an inhibitor of GABA transporter, and dispalys modest selectivity for cloned GABA transporters with IC₅₀s of 14 μM (human GAT-1), 39 μM (rat GAT-1), 58 μM (rat GAT-2), 119 μM (human GAT-3), 378 μM (rat GAT-3), and 1870 μM (human BGT-3).

L-655708 is a potent α5 subunit-selective GABAA receptor inverse agonist (K_i=0.45 nM).

NNC 05-2090 hydrochloride is a GABA uptake inhibitor and inhibitor of the β-GABA transporter (BGT-1) (IC_{50< /sub>}: 10.6 μM). NNC 05-2090 hydrochloride also inhibits mGAT2 with a K_i value of 1.4 μM. NNC 05-2090 has anticonvulsant activity and can be used in the study of epilepsy and neurological diseases.

γ-Acetylenic GABA (GAG) hydrochloride is an irreversible inhibitor of GABA-transaminase. γ-Acetylenic GABA hydrochloride can increase the concentration of GABA in rat brain. γ-Acetylenic GABA (hydrochloride) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.

FG 7142 (ZK 39106; LSU-65), a non-selectively benzodiazepine inverse agonist, has high affinity for the α1 subunit-containing GABAA receptor (K_i=91 nM). FG 7142 (ZK 39106; LSU-65) also modulates GABA-induced chloride flux at GABAA receptors expressing the α1 subunit (EC₅₀= 137 nM). FG 7142 (ZK 39106; LSU-65) can increase tyrosine hydroxylation and cause upregulation of β-adrenoceptors in mouse cerebral cortex.

NNC-711 (NO-711 hydrochloride) is a potent and selective inhibitor of GAT-1 (GABA transporter 1) with IC₅₀ values of 0.04, 0.38, 171, 1700, 349, 622 μM for human GAT-1, rat GAT-1, rGAT-2, hGAT-3, rGAT-3, hBGT-3, respectively. NNC-711 has anticonvulsant and analgesic effect in vivo and exhibits cognition-enhancing activity.

SKF89976A hydrochloride is a selective GABA transporter (GAT-1) inhibitor with IC₅₀s of 0.28 μM, 137.34 μM and 202.8 μM for GAT-1, GAT-2 and GAT-3 in CHO cells, respectively.

L-DABA (L-2,4-Diaminobutyric acid) is a week GABA transaminase inhibitor with an IC₅₀ of larger than 500 μM; exhibits antitumor activity in vivo and in vitro.

Arecaidine is a GABA transport system inhibitor. Arecaidine inhibits the proliferation of oral mucosal fibroblasts, increases the secretion of IL-6, TGF-β and TNF-α in cells, downregulates the expression of PPAR-γ and PCK1 in cells, and upregulates the expression of TGF-β1. Arecaidine inhibits the uptake of γ-aminobutyric acid and β-alanine by the central nervous system of cats. Arecaidine inhibits hPAT1-mediated L-[³H]proline uptake in cells. Arecaidine can be used in research related to neurological diseases.

Spinacine ((S)-Spinacine) is a GABA uptake inhibitor. Spinacine enhances synaptic GABA effects via inhibition of gamma-aminobutyric acid uptake in cerebral cortex slices. Spinacine inhibits reflex responses of ventral roots in isolated spinal cord. Spinacine inhibits motor activity and reduces approaches to water dispensers in conflict situations. Spinacine raises pain sensitivity threshold via subarachnoidal injection.

SCS (Salicylidene salicylhydrazide) is a potent, allosteric and selective inhibitor of β1-containing GABA_A receptors with an IC₅₀ of 32 nM against α2β1γ1θ by VIPR measurement. SCS is also a chelator of metal ions.

DL-Gabaculine hydrochloride is a neurotoxin that irreversibly inhibits bacterial pyridoxal phosphate linked γ-aminobutyric acid-α-ketoglutaric acid transaminase with a K_i of 2.86 μM.

DMCM hydrochloride is a nonselective full inverse agonist of benzodiazepine. DMCM shows bnding afinity at human recombinant GABAA αxβ3γ2 receptor subtypes with K_is of 10 nM, 13 nM, 7.5 nM, 2.2 nM for α1, α2, α3, and α5 receptors, respectively.

Arecaidine hydrochloride is a GABA transport system inhibitor. Arecaidine hydrochloride inhibits the proliferation of oral mucosal fibroblasts, increases the secretion of IL-6, TGF-β and TNF-α in cells, downregulates the expression of PPAR-γ and PCK1 in cells, and upregulates the expression of TGF-β1. Arecaidine hydrochloride inhibits the uptake of γ-aminobutyric acid and β-alanine by the central nervous system of cats. Arecaidine hydrochloride inhibits hPAT1-mediated L-[³H]proline uptake in cells. Arecaidine hydrochloride can be used in research related to neurological diseases.

Fipronil sulfone is the major metabolite of Fipronil.Fipronil sulfone selectively inhibits GABA receptor with IC₅₀ of 175 nM (assayed by displacement of 4′-ethynyl-4-n-[2,3-3H2]- propylbicycloorthobenzoate ([3H]EBOB) from the noncompetitive blocker site).

DL-Pyroglutamic acid (CAE) as an inactivator of hepatitis B surface, inactivates vaccinia virus, herpes simplex virus, and influenza virus except poliovirus. DL-Pyroglutamic acid is also a possible inhibitor of GABA transaminase, increases GABA amount with antiepileptic action.

1-Phenyl-2-pyrrolidinone (1-Phenylpyrrolidin-2-one) is a phenyl analogue of GABA with sedative effect, decreasing the exploratory behavior of rats at 50-100 mg/kg (i.v.). 1-Phenyl-2-pyrrolidinone also has been proved to inhibit emotional reactions in dogs and cats. 1-Phenyl-2-pyrrolidinone induces decreases in the pressor reaction to emotional stress without accompanied by normalization of the function of baroreceptor reflexes.