Doxapram hydrochloride hydrate inhibits TASK-1, TASK-3, TASK-1/TASK-3 heterodimeric channel function with EC50 of 410 nM, 37 μM, 9 μM, respectively.Target: Potassium ChannelDoxapram is a respiratory stimulant. Doxapram (15-150 microM) also evoked 3H overflow in a concentration dependent manner, and doxapram-evoked release was inhibited by the Ca2+ channel blocker nifedipine (5 microM). Analysis of released tritiated compounds suggested that doxapram preferentially stimulated the release of dopamine. Our results indicate that the mechanism of action of doxapram shares similarities with that of hypoxia in the carotid body [1]. Doxapram (1-100 microM) caused rapid, reversible and dose-dependent inhibitions of K+ currents recorded in type I cells (IC50 approximately 13 microM). doxapram was also seen to directly inhibit Ca(2+)-independent K+ currents. Doxapram was a more potent inhibitor of the Ca(2+)-activated K+ currents recorded under control conditions. Doxapram (10 microM) was without effect on L-type Ca2+ channel currents recorded under conditions where K+ channel activity was minimized and was also without significant effect on K+ currents recorded in the neuronal cell line NG-108 15, suggesting a selective effect on carotid body type I cells. The effects of doxapram on type I cells show similarities to those of the physiological stimuli of the carotid body, suggesting that doxapram may share a similar mechanism of action in stimulating the intact organ [2].
Quinate is an antiarrhythmic agent. Quinate is a potent, orally active, selective cytochrome P450db inhibitor. Quinate is also a K+ channel blocker with an IC50 of 19.9 μM. Quinate can be used for malaria research[1][2][3].
RuBi-4AP, a derivative of 4-aminopyridine (4AP; HY-B0604), is a caged Kv channel blocker. RuBi-4AP contains a photolabile protecting group, allowing its effect to be controlled precisely in both space and time with light. RuBi-4AP can be used for the research of neuronal excitability, synaptic transmission, and signal propagation[1][2].
ShK toxin blocks voltage-dependent potassium channel (Kv1.3 channel). ShK toxin can be isolated from the whole body extract of the Caribbean sea anemone (Stichodactylu helianthus). ShK toxin competes with dendrotoxin I and α-dendrotoxin for binding to synaptosomal membranes of rat brain, facilitates acetylcholine release. ShK toxin suppresses K+ currents in cultured rat dorsal root ganglion neurons. ShK toxin also inhibits T lymphocyte proliferation[1][2].
Almitrine mesylate, a peripheral chemoreceptor agonist, inhibits selectively the Ca2+-dependent K+ channel.
Rimtuzalcap (CAD-1883) is a first-in-class selective positive allosteric modulator of small-conductance calcium-activated potassium channels (SK channels). Rimtuzalcap can be used for the research of movement disorders including essential tremor (ET) and spinocerebellar ataxia (SCA)[1].
Maurotoxin is a 34-residue and four disulde-bridged toxin that can be isolated from the chactoid scorpion (Scorpio maurus). Maurotoxin inhibits the Shaker potassium channels (ShB) K+ current with an IC50 of 2 nM[1][2].
Ropivacaine hydrochloride is an inhibitor of K2P (two-pore domain potassium channel) TREK-1 with an IC50 of 402.7 μM.
Gliclazide D4 (S1702 D4) is the deuterium labeled Gliclazide. Gliclazide (S1702) is a whole-cell beta-cell ATP-sensitive potassium currents blocker with an IC50 of 184 nM. Gliclazide is used as an antidiabetic[1].
VU0134992 is a selective inward rectifier potassium (Kir) channel Kir4.1 blocker with an IC50 of 0.97 µM[1].
Almokalant is a class III antiarrhythmic drug, acts as a potassium channel blocker, and inhibits a specific component (Ikr) of the time-dependent delayed rectifier K+ current.
(Thr4,Gly7)-Oxytocin, an Oxytocin analogue, is a specific OT receptor agonist. (Thr4,Gly7)-Oxytocin also excites subicular neurons via activation of TRPV1 channels, and depression of K+ channels. [1][2].
Mesoridazine (TPS-23) , a metabolite of Thioridazine (HY-B0965A), acts as an orally active phenothiazine antipsychotic agent. Mesoridazine is a potent and rapid open-channel blocker of human ether-a-go-go related gene (hERG) channels and blocks hERG currents with an IC50 of 550 nM (at 0 mV) in human embryonic kidney 293 cells[1].Mesoridazine can be used for the research of schizophrenia, as well as certain other psychiatric disorders[1][2].
Mefloquine (Mefloquin), an orally active and potent quinoline antimalarial agent, is an anti-SARS-CoV-2 entry inhibitor. Mefloquine is also a K+ channel (KvQT1/minK) antagonist with an IC50 of ~1 μM. Mefloquine can be used for malaria, systemic lupus erythematosus and cancer research[1][2][3].
O-Nornuciferine, an aporphine-type alkaloid from lotus leaf, is a potent hERG channel inhibitor[1].
Senicapoc (ICA-17043) is a potent and selective Gardos channel blocker with IC50 value of 11 nM. It blocks Ca2+-induced rubidium flux from human RBCs with an IC50 value of 11 nM and inhibits RBC dehydration with IC50 of 30 nM.
SKA-121 is a selective KCa3.1 activator. SKA-121 exhibits EC50s of 109 nM and 4.4 μM for KCa3.1 and KCa2.3, respectively.
Quinine sulfate (2:1) (Qualaquin) is an orally active alkaloid extracted from cinchona bark and can be used in anti-malarial studies. Quinine sulfate (2:1) is a potassium channel inhibitor that inhibits WT mouse Slo3 (KCa5.1) channel currents evoked by voltage pulses to +100 mV with an IC50 of 169 μM[1][2].
Anticancer agent 72 (compound 8c) is a potent inhibitor of K+ channel. Anticancer agent 72 induces apoptosis[1].
Clofilium tosylate, a potassium channel blocker, induces apoptosis of human promyelocytic leukemia (HL-60) cells via Bcl-2-insensitive activation of caspase-3. Antiarrhythmic agent[1].
Dibutyryl-cGMP sodium (Bt2cGMP sodium) is a cell-permeable cGMP analogue. Dibutyryl-cGMP sodium preferentially activates cGMP-dependent protein kinase (PKG). Dibutyryl-cGMP sodium inhibits the release of [3H]-arachidonic acid from γ thrombin-stimulated human platelets. Dibutyryl-cGMP sodium induces peripheral antinociception via activation of ATP-sensitive K+ channels[1][2][3].
Pandinotoxin Kα, isolated from the venom of Pandinus imperator, is the inhibitor of A-type potassium channel[1].
Amiodarone-d10 hydrochloride is the deuterium labeled Amiodarone. Amiodarone hydrochloride is an antiarrhythmic drug for inhibition of ATP-sensitive potassium channel with an IC50 of 19.1 μM[1][2].
GSK369796 Dihydrochloride is an affordable and effective antimalarial and inhibits hERG potassium ion channel repolarization with an IC50 of 7.5 μM.
Y-26763 is a K+ channel opener and active metabolite of Y-27152[1]. Y-26763 is an ATP-sensitive K+ (KATP) channel activator[2].
Clobutinol hydrochloride is a compound that has anti-tussive effects. Clobutinol hydrochloride affects heart rate and blood pressure, it can be used for cough related research[1][2][3].
Noxiustoxin is a toxin from the venom of the Mexican scorpion Centruroides noxius which block voltage-dependent potassium channel (Kv1.3, IC50 = 360 nM), and calcium-activated potassium channel. Noxiustoxin plays an important role in neuroinflammatory disease[1][2].
AMP-PNP tetralithium (Adenylyl-imidodiphosphate tetralithium) is a non-hydrolysable analogue of ATP and inhibits KATP channels[1][2].
IK1 inhibitor PA-6 (PA-6), a pentamidine analogue, is a selective and potent IK1 (KIR2.x ion-channel-carried inward rectifier current) inhibitor, with IC50 values of 12-15 nM for human and mouse KIR2.x currents. IK1 inhibitor PA-6 (PA-6) elevates KIR2.1 protein expression and induces intracellular KIR2.1 accumulation. IK1 inhibitor PA-6 (PA-6) has the potential to treat atrial fibrillation and arrhythmia[1][2][3].
Dendrotoxin-I is a potent K+ channels blocker and targets voltage-gated potassium channel subunits KV1.1 and KV1.2. Dendrotoxin-I is a neurotoxin isolated from thevenom of Dendroaspis snakes[1][2][3].