Epiboxidine hydrochloride is a potent and selective neural nAChR agonist with Kis of 0.46 nM and 1.2 nM for rat and human α4β2 nAChRs, respectively. Epiboxidine hydrochloride is a methylisoxazole analog of the alkaloid Epibatidine, and is also an analog of another nAChR agonist, ABT 418[1].
Xanthoplanine, isolated from theroot of Xylopia parviflora, fully inhibits the EC50 ACh responses of both alpha7 and alpha4beta2 nACh receptors with estimated IC50 values of 9 μM (alpha7) and 5 μM (alpha4beta2)[1].
NS9283 is a positive positive allosteric modulator of (α4)3(β2)2 nicotinic ACh receptors. NS9283 can be used in a series of neurological conditions such as attention deficit hyperactivity disorder (ADHD), schizophrenia, Parkinson's disease and Alzheimer's disease[1].
Simpinicline (OC-02), a highly selective nicotinic acetylcholine receptor (nAChR) agonist, shows potent antiviral activity against the SARS-CoV-2 variants in cell culture with an IC50 of 0.04 µM[1].
APS3 is a GABA and nACh receptors inhibitor, with a LC50 of 7.2423 μg/mL against Plutella xylostella[1].
COG 133 is a fragment of Apolipoprotein E (APOE) peptide. COG 133 competes with the ApoE holoprotein for binding the LDL receptor, with potent anti-inflammatory and neuroprotective effects. COG 133 is also a nAChR antagonist with an IC50 of 445 nM[1][2].
CP-601932 ((1S,5R)-CP-601927) is a high-affinity partial agonist at α3β4 nAChR (EC50=~ 3 μM). CP-601932 has the same high-binding affinity at α3β4 (Ki=21 nM) as at α4β2 nAChRs (Ki=21 nM) and an order of magnitude lower affinity for α6 and α7 nAChR subtypes. CP-601932 selectively decreases ethanol but not sucrose consumption and operant self-administration following long-term exposure. CP-601932 readily penetrates the CNS[1].
Cyclodrine hydrochloride is a cholinergic (muscarinic, nicotinic) (mAChR and nAChR) receptor antagonist.
Dinotefuran is an insecticide of the neonicotinoid class, its mechanism of action involves disruption of the insect's nervous system by inhibiting nicotinic acetylcholine receptors.Target: nAChR, Antiparasitic
Lobeline hydrochloride, a nicotinic receptor agonist, acting as a potent antagonist at both α3β2 and α4β2 neuronal nicotinic receptor subtypes.
Waglerin-1, a 22-amino acid peptide, is a competitive antagonist of the muscle nicotinic receptor (nAChR)[1].
α-Bungarotoxin is a competitive antagonist at nicotinic acetylcholine receptors (nAChRs). α-Bungarotoxin, a selective α7 receptor blocker, blocks α7 currents with an IC50 of 1.6 nM and has no effects on α3β4 currents at concentrations up to 3 μM[1][2].
Desformylflustrabromine hydrochloride is a selective agonist of α4β2 neuronal nicotinic acetylcholine receptor (nAChR) with a pEC50 of 6.48.
ACV1 (Vc1.1), an α-Conotoxin, is a selective α9α10 nAChR antagonist with an IC50 of 19 nM. ACV1 is ~100-fold less potent on human α9α10 vs. rat nAChRs[1].
TC-2559 idifumarate is a CNS-selective, orally active α4β2 subtype of nicotinic acetylcholine receptor (nAChR) partial agonist (EC50=0.18 μM). TC-2559 difumarate shows selectivity for α4β2 over α2β4, α4β4 and α3β4 receptors, with EC50s in the range of 10-30 µM. Antinociceptive effect[1][2].
GTS-21 dihydrochloride is a selective α7 nicotinic acetylcholine receptor agonist, has recently been established as a promising treatment for inflammation. Target: nAChRin vitro: GTS-21 is one of the most potent α7nAChR agonists, has been reported to attenuate pro-inflammatory cytokine production, improve outcomes in sepsis models, pancreatitis, and ischemia-reperfusion injury, and inhibit the production of endotoxin-induced TNF in lung tissue. In addition, recent studies have demonstrated that GTS-21 inhibits the activities of endothelial cells and monocyte macrophages, as well as the secretion of pro-inflammatory cytokines in peripheral blood samples, by regulating the JAK2-STAT3 pathway. [1] in vivo: In septic animals, GTS-21 significantly ameliorated GI motility, lowered systemic and colonic levels of IL-6, decreased colonic permeability, and decreased the number of positive cultures obtained from blood and mesenteric lymph nodes. Splenectomy prevented animals from developing sepsis-induced ileus. Chrna7 mice displayed a more severe septic phenotype, whereas GTS-21 remarkably was also beneficial in these animals. [2]
N-Methylcytisine (Caulophylline), a tricyclic quinolizidine alkaloid, exerts hypoglycaemic, analgesic and anti-inflammatory activities. N-methylcytisine is a selective ligand of nicotinic receptors of acetylcholine in the central nervous system and has a high affinity (Kd = 50 nM) to nicotinic acetylcholine receptors (nAChR) from squid optical ganglia[1][2].
SSR180711 hydrochloride is an orally active, selective and reversible α7 acetylcholine nicotinic receptor (n-AChRs) partial agonist. SSR180711 hydrochloride can act on rat α7 n-AChR (Ki=22 nM; IC50=30 nM) and human α7 n-AChR (Ki=14 nM; IC50=18 nM). SSR180711 hydrochloride increases glutamatergic neurotransmission, ACh release and long-term potentiation (LTP) in the hippocampus[1].
D-Tubocurarine chloride pentahydrate is the chloride salt form of Tubocurarine, a nicotinic acetylcholine receptors (AChR) antagonist, and can be used as a skeletal muscle relaxant during surgery or mechanical ventilation. D-Tubocurarine chloride pentahydrate is also a potent neuromuscular blocking agent[1][2][3].
bPiDDB is a potent nAChR antagonist. bPiDDB potently (IC50=2 nM) inhibits nicotine-evoked striatal dopamine (DA) release through an interaction with α6β2-containing nAChRs[1].
PNU-282987 is a selective α7 nicotinic acetylcholine receptor(α7 nAChR) agonist with Ki of 26 nM; no affinity for α1β1γδ and α3β4 nAChRs (IC50 ≥ 60 μM).IC50 value: 26 nM(Ki) [1]Target: α7 nAChR agonistin vitro: Treatment with PNU-282987 resulted in an attenuation of neuroinflammation in the MPTP-lesioned SN. Furthermore, PNU-282987 attenuated MPTP-induced dopaminergic cell loss in the SN and reduced striatal dopamine depletion [3].in vivo: Mice were subjected to 70% partial hepatic I/R for 60 min and pretreated with either vehicle or with PNU-282987, and blood and hepatic tissue samples were collected at 3, 6, and 12 h following reperfusion. pretreatment with PNU-282987 decreased serum transaminase levels and ameliorated liver injury after hepatic I/R. Moreover, pretreatment with PNU-282987 suppressed NF-κB activation, cytokine production (tumor necrosis factor α, interleukin 1β), and HMGB1 expression in liver after hepatic I/R [2]. Mice treated with 2.5 and 10 mg/kg of PNU devoted less time to rearing into open arms. In the HB task, MC mice displayed higher exploratory activity reflected in more head-dips (HD) during the first minute than EE and SE, whereas EE displayed low exploration levels reflected in total HD (5 min) [4].
(-)-Sparteine (sulfate) is a quinolizidine alkaloid that can be extracted from Lupinus. (-)-Sparteine (sulfate) inhibits the release of acetylcholine and has anticonvulsant effects[1].
α-Conotoxin GI has high affinity for nAChR.α-Conotoxin GI is a short peptide toxin that can be isolated from the venom of Conus geographus.α-Conotoxin GI has the similar activity with neuromuscular blocking agent[1][2][3].
Cisatracurium Besylate is a nondepolarizing neuromuscular blocking agent, antagonizing the action of acetylcholine by inhibiting neuromuscular transmission.Target: AChR alpha-2Cisatracurium is a neuromuscular-blocking drug or skeletal muscle relaxant in the category of non-depolarizing neuromuscular-blocking drugs, used adjunctively in anesthesia to facilitate endotracheal intubation and to provide skeletal muscle relaxation during surgery or mechanical ventilation. It is a bisbenzyltetrahydroisoquinolinium agent with an intermediate duration of action. Cisatracurium is one of the ten isomers of the parent molecule, atracurium. Moreover, cisatracurium represents approximately 15% of the atracurium mixture [1, 2].
Dihydro-β-erythroidine (DHβE) hydrobromide is a potent, orally active, and competitive antagonist of neuronal nAChRs. Dihydro-β-erythroidine hydrobromide shows selectivity for α4β4 and α4β2 nAChRs, with IC50s of 0.19 and 0.37 μM, respectively. Antidepressant-like activities[1][2][3].
UB-165 is a nAChR agonist, being a full agonist of the α3β2 isoform and a partial agonist of the α4β2* isoform, with a Ki value of 0.27 nM for [3H]-nicotine binding in rat brain[1].
PNU-120596 (NSC 216666 ) is a potent and selective positive allosteric α7 nAChR modulator with an EC50 of 0.2 μM.IC50 value: 0.2 uM (EC50) [1] Target: α7in vitro: PNU-120596 increases agonist (Ach)-evoked calcium flux mediated by an engineered variant of the human α7 nAChR. PNU-120596 increases agonists (choline and ACh)-evoked currents mediated by wild-type receptors and also demonstrates a pronounced prolongation of the evoked response in the continued presence of agonist in Xenopus oocytes. PNU-120596 increases the channel mean open time ofα7 nAChRs but has no effect on ion selectivity and relatively little, if any, effect on unitary conductance. When applied to acute hippocampal slices, PNU-120596 increases the frequency of ACh-evoked GABAergic postsynaptic currents measured in pyramidal neurons; this effect is suppressed by TTX, suggesting that PNU-120596 modulates the function of α7 nAChRs located on the somatodendritic membrane of hippocampal interneurons [1]. Besides the positive modulation to α7 nAChR, PNU-120596 induces a profound retardation of the kinetics of desensitization, raising the potential of Ca2+-induced toxicity through excessive stimulation of α7 nAChR [2]. PNU-120596 causes changes in cysteine accessibility at the inner beta sheet, transition zone and agonist binding site while binding to α7 nAChR. Binding sites for PNU-120596 are not in the agonist-binding sites and PNU-120596 enhances agonist-evoked gating of nicotinic receptors by eliciting conformational effects that are similar but nonidentical to the gating conformations promoted by Ach [3].in vivo: Systemic administration of PNU-120596 (1 mg/kg) to rats improves the auditory gating deficit caused by amphetamine, a model proposed to reflect a circuit level disturbance associated with schizophrenia. [1] When administered prior to Carrageenan, 30 mg/kg PNU-1230596 significantly blunts mechanical hyperalgesia and weight bearing deficits for up to 4 hours. PNU-120596 attenuates the carrageenan-induced increase in levels of TNF-α and IL-6 within the hindpaw oedema, diclofenac only attenuated IL-6 levels. Established mechanical hyperalgesia induced by Carrageenan or CFA is also partially reversed by PNU-120596 [4].
nAChR agonist CMPI hydrochloride is a potent and selective positive allosteric modulator (PAM) of nAChR containing a α4:α4 subunit interface. nAChR agonist CMPI hydrochloride enhances the response of (α4)3(β2)2 nAChR to ACh (10 µM) with an EC50 of 0.26 µM. nAChR agonist CMPI hydrochloride has potential for the research of nicotine dependence and many neuropsychiatric conditions associated with decreased brain cholinergic activity[1][2].
Anagyrine is an alkaloid that has been found in L. albus and has nematocidal and anticancer activities[1].It binds to muscarinic and nicotinic acetylcholine receptors (AChRs) with IC50 values of 132 and 2096 µM respectively[2].
3-Pyr-Cytisine (3-Pyr-Cyt) is a cytisine derivative. 3-Pyr-Cytisine is a very weak α4β2 nAChR partial agonist that has been studied as an antidepressant[1].