N20C hydrochloride is a selective and noncompetitive open NMDA receptor open channel blocker, with micromolar affinity, fast on-off blockade kinetics, and strong voltage dependence. Neuroprotective activity[1].
NMDAR/TRPM4-IN-2 free base (compound 8) is a potent NMDAR/TRPM4 interaction interface inhibitor. NMDAR/TRPM4-IN-2 free base shows neuroprotective activity. NMDAR/TRPM4-IN-2 free base prevents NMDA-induced cell death and mitochondrial dysfunction in hippocampal neurons, with an IC50 of 2.1 μM. NMDAR/TRPM4-IN-2 free base protects mice from MCAO-induced brain damage and NMDA-induced retinal ganglion cell loss[1].
Flupirtine(D 9998) is a selective neuronal potassium channel opener that also has NMDA receptor antagonist properties.IC50 Value: Target: Potassium channel; NMDA receptorin vitro: High concentrations of flupirtine antagonized inward currents to NMDA(200 microM) at -70 mV with an lC50 against steady-state responses of 182.1+/-12.1 microM. The effects of flupirtine were voltage-independent and not associated with receptor desensitization making actions within the NMDA receptor channel or at the glycine modulatory site unlikely. NMDA receptor antagonism probably has little relevance for the clinical efficacy of flupirtine as the concentrations needed were far higher than those achieved in clinical practice. However, the activation of a G-protein-regulated inwardly rectifying K+ channel was identified as an interesting molecular target site of flupirtine. In the next stage, the central nervous spectrum of action of experimental K+ channel openers (PCO) was considered. As far as they have been studied, experimental K+ channel openers display a spectrum of action comparable to that of flupirtine [1]. Therapeutic flupirtine concentrations (≤10 ?M) did not affect voltage-gated Na(+) or Ca(2+) channels, inward rectifier K(+) channels, nicotinic acetylcholine receptors, glycine or ionotropic glutamate receptors. Flupirtine shifted the gating of K(V)7 K(+) channels to more negative potentials and the gating of GABA(A) receptors to lower GABA concentrations [2]. Cell exposure to flupirtine decreased the amplitude of delayed rectifier K(+) current (I(K(DR))) with a concomitant raise in current inactivation in NSC-34 neuronal cells [4].in vivo: Rats were trained to discriminate the novel analgesic flupirtine (10.0 mg/kg i.p., 10 min) from no drug under a two-choice fixed-ratio 5 shock-termination schedule. Flupirtine yielded a dose-response curve with an ED50 of 3.87 mg/kg. The opioid analgesics pentazocine, codeine and tramadol failed to produce flupirtine appropriate responding. The opioid antagonist naltrexone did not antagonize the discriminative effects of flupirtine [3]. Both morphine (ED?? =?0.74?mg/kg) and flupirtine (ED???=?3.32?mg/kg) caused dose-related anti-hyperalgesia at doses that did not cause sedation [5]. Toxicity: Based on study-end data, hepatotoxicity was detected in 31% of patients receiving flupirtine for ≥ 6 weeks [6].
24(S)-Hydroxycholesterol (24S-OHC), the major brain cholesterol metabolite, plays an important role to maintain homeostasis of cholesterol in the brain. 24(S)-Hydroxycholesterol (24S-OHC) is one of the most efficient endogenous LXR agonist known and is present in the brain and in the circulation at relatively high levels. 24(S)-Hydroxycholesterol (24S-OHC) is a very potent, direct, and selective positive allosteric modulator of NMDARs with a mechanism that does not overlapthat of other allosteric modulators[1][2][3].
Philanthotoxin 74 dihydrochloride (PhTx 74) is an AMPAR antagonist; inhibits GluR3 and GluR1 with IC50s of 263 and 296 nM, respectively.
Sepimostat exhibits neuroprotective activity via NR2B N-methyl-D-aspartate receptor antagonism at the Ifenprodil-binding site of the NR2B subunit. Sepimostat inhibits the Ifenprodil binding with a Ki value of 27.7 µM[1].
Irampanel (BIIR 561) is an AMPA receptor and voltage-dependent sodium channel blocker. Irampanel inhibits kainate-induced currents in rat cortical neurons[1].
PEPA is an allosteric modulator of AMPA receptors; binds to the GluA2o and GluA3o LBDs and can be utilized as an indicator of AMPA receptor heterogeneity.IC50 value:Target: AMPAR modulatorin vitro: PEPA dose-dependently potentiated AMPA-induced increase of [Ca2+]i. In 90% (72 out of 80) of the cells in which cyclothiazide acts, PEPA potentiated the increased [Ca2+]i induced by AMPA with pronounced cell-to-cell variation in rat hippocampal cultures [1]. PEPA bound to the binding domains of the GluA2 and GluA3 flop isoforms of AMPA receptors [2]. coapplication of AMPA with PEPA protected hippocampal CA1 neurons from brain ischemia-induced death. Coapplication of AMPA with PEPA could prevent downregulated expression of GluR2 subunit caused by ischemia and increase BDNF expression via Lyn-ERK1/2-CREB signaling [4].in vivo: PEPA (3, 10, 30mg/kg body weight) or vehicle was intraperitoneally administered into stressed mice once before the first extinction session. The significant decrease of the freezing response in the extinction sessions was only seen in the 30mg/kg PEPA-administered stressed mice, compared with vehicle-administered stressed mice [3].
Unifiram (DM232) is acts as a potent cognition enhancer through the activation of the AMPA-mediated neurotransmission system. Unifiram (DM232) has the potential for amnesia prevention and neurodegenerative disorder research[1][2].
D-Cycloserine is an analog of the amino acid D-alanine.Target: AntibacterialD-Cycloserine selectively potentiated the duration of motor cortical excitability enhancements induced by anodal tDCS. D-Cycloserine alone did not modulate excitability [1]. Participants receiving d-cycloserine in addition to exposure therapy reported significantly less social anxiety compared with patients receiving exposure therapy plus placebo. Controlled effect sizes were in the medium to large range [2]. Chronic D-cycloserine significantly reduced nicotine self-administration selectively in rats with low baseline nicotine use, but was ineffective with the rats with higher levels of baseline nicotine self-administration [3].
Traxoprodil (CP101,606) is a potent and selective NMDA antagonist and protect hippocampal neurons with an IC50 of 10 nM.
GV-196771A is the sodium salt form of GV196771, is an NMDA receptor antagonist.
IEM-1754, a dicationic adamantane derivative, is a potent blocker of open channels of native ionotropic glutamate receptors including quisqualate-sensitive receptors in insect muscles, NMDAR in cultured rat cortical neurons, and AMPAR in freshly isolated hippocampal cells. IEM-1754 shows anticonvulsant potency in vivo[1][2].
UBP618 is a GluN1/GluN2 receptors pan-inhibitor.
UBP141 is a GluN2C/2D (NR2C/2D)-preferring receptor antagonist, with Kds of 2.8, 4.2, 14.2, and 19.3 μM for NMDA receptor subtypes: GluN2C, 2D, 2A, and 2B, respectively. UBP141 can induce potent motor impairment in WT mice[1][2].
Caroverine hydrochloride is a potent, competitive and reversible antagonist of NMDA and AMPA glutamate receptor. Caroverine hydrochloride is also an antioxidant and calcium-blocking agent that exhibits vasorelaxant action. Caroverine hydrochloride can be used for the research of inner ear tinnitus[1][2][3].
Salfaprodil (Neu2000 potassium) is an NR2B-selective and uncompetitive antagonist of N-methyl-D-aspartate (NMDA), and a free radical scavenger. Salfaprodil has excellent neuroprotection against NMDA- and free radical-induced cell death[1][2].
NMDAR/TRPM4-IN-2 (compound 8) is a potent NMDAR/TRPM4 interaction interface inhibitor. NMDAR/TRPM4-IN-2 shows neuroprotective activity. NMDAR/TRPM4-IN-2 prevents NMDA-induced cell death and mitochondrial dysfunction in hippocampal neurons, with an IC50 of 2.1 μM. NMDAR/TRPM4-IN-2 protects mice from MCAO-induced brain damage and NMDA-induced retinal ganglion cell loss[1].
LY 235959 is a competitive N-methyl-D-aspartate (NMDA)-receptor antagonist. LY 235959 potentiates the anticonvulsant action of antiepileptics[1].
Tat-NR2BAA is the control peptide of Tat-NR2B9c (HY-P0117), inactive. The sequence of Tat-NR2BAA is similar to Tat-NR2B9c, but it has a double-point mutation in the COOH terminal tSXV motif, making it incapable of binding PSD-95. Tat-NR2B9c is a membrane-permeant peptide and disrupts PSD-95/NMDAR binding, correlate with uncoupling NR2B- and/or NR2A-type NMDARs from PSD-95[1][2].
CP-465022 is a potent, and selective noncompetitive AMPA receptor antagonist with anticonvulsant activity. CP-465022 is against Kainate-induced response with an IC50 of 25 nM in rat cortical neurons. CP-465022 provides a new tool to investigate the role of AMPA receptors in physiological and pathophysiological processes[1][2].
Tulrampator (CX-1632) is an orally bioavailable positive allosteric modulator of AMPA receptor (AMPAR)[1]. Antidepressant[1].
SDZ 220-581 ammonium salt is a potent, competitive antagonist at the NMDA glutamate receptor subtype(pKi= 7.7). IC50 Value: Target: NMDA receptorin vitro: Wake-promoting doses of LSN2463359 and LSN2814617 attenuated deficits in performance induced by the competitiveNMDA receptor antagonist SDZ 220,581 in two tests of operant behaviour: the variable interval 30 s task and the DMTP task [1].in vivo: Administration of SDZ 220-581 or CGS 19755 was associated with a robust reduction in PPI, whereas L-701,324, 4-Cl-KYN or MLA failed to alter PPI [2]. With the most active agent, SDZ 220-581, full protection against maximal electroshock seizures (MES) was obtained at oral doses of 10 mg/kg in rats and in mice. The compound had a fast onset (< or = 1 hr) and a long duration (> or = 24 hr) of action [3]. Rats were pretreated with clozapine (0 or 5.0 mg/kg) or haloperidol (0 or 0.1 mg/kg), together with SDZ 220-581 (0 or 2.5 mg/kg), and tested. SDZ 220-581 and SDZ EAB-515 decreased PPI without affecting startle magnitude [4].
Ensaculin free base (KA-672) is a NMDA antagonist and have high affinities to serotonergic 5-HT1A and 5-HT7 receptors, adrenergic α1, and dopaminergic D2 and D3 receptors. Ensaculin free base is a memory-enhancing agent. Ensaculin free base has the potential as an antidementia agent acting on various transmitter systems[1].
LY 274614 is an orally active, competitive NMDA receptor antagonist. LY 274614 can be used for Neurological Disease study[1].
Kynurenic acid, an endogenous tryptophan metabolite, is a broad-spectrum antagonist targeting NMDA, glutamate, α7 nicotinic acetylcholine receptor. Kynurenic acid is also a selective ligand of the GPR35 receptor.
UBP-282 is a potent, selective and competitive AMPA and kainate receptor antagonist. UBP-282 inhibits the fast component of the dorsal root-evoked ventral root potential (fDR-VRP) with an IC50 value of 10.3 μM. UBP-282 antagonizes kainate-induced depolarisations of dorsal roots with a pA2 value of 4.96[1][2].
Kynurenic acid, an endogenous tryptophan metabolite, is a broad-spectrum antagonist targeting NMDA, glutamate, α7 nicotinic acetylcholine receptor. Kynurenic acid is also a selective ligand of the GPR35 receptor.
Withanone is an active constituent from Withania somnifera roots with multifunctional neuroprotective effect in alleviating cognitive dysfunction. Withanone affords protection against N-methyl-D-aspartate (NMDA)-induced excitotoxicity in Neuron-like cells[1][2].
SDZ 220-581 Hcl is a potent, competitive antagonist at the NMDA glutamate receptor subtype(pKi= 7.7).IC50 Value: Target: NMDA receptorin vitro: Wake-promoting doses of LSN2463359 and LSN2814617 attenuated deficits in performance induced by the competitiveNMDA receptor antagonist SDZ 220,581 in two tests of operant behaviour: the variable interval 30 s task and the DMTP task [1].in vivo: Administration of SDZ 220-581 or CGS 19755 was associated with a robust reduction in PPI, whereas L-701,324, 4-Cl-KYN or MLA failed to alter PPI [2]. With the most active agent, SDZ 220-581, full protection against maximal electroshock seizures (MES) was obtained at oral doses of 10 mg/kg in rats and in mice. The compound had a fast onset (< or = 1 hr) and a long duration (> or = 24 hr) of action [3]. Rats were pretreated with clozapine (0 or 5.0 mg/kg) or haloperidol (0 or 0.1 mg/kg), together with SDZ 220-581 (0 or 2.5 mg/kg), and tested. SDZ 220-581 and SDZ EAB-515 decreased PPI without affecting startle magnitude [4].