threo Ifenprodil hemitartrate is a σ receptor agonist, with Kis of 59.1 and 2 nM for σ1 and σ2 receptors, respectively. threo Ifenprodil hemitartrate is also a NR2B subunit-selective NMDA receptor antagonist (IC50=0.22 μM). threo Ifenprodil hemitartrate is a hERG potassium channel inhibitor, with an IC 50 of 88 nM, showing antiarrhythmic activity[1][2][3].
KB-5492 free base is a potent and selective inhibitor of sigma receptor, inhibits specific [3H]1,3-di(2-tolyl)guanidine (DTG) binding to the sigma receptor with an IC50 of 3.15 μM. KB-5492 free base is an anti-ulcer agent[1][2].
Siramesine(Lu 28-179) is a selective sigma-2 receptor agonist, which has been shown to trigger cell death of cancer cells and to exhibit a potent anticancer activity in vivo. IC50 value:Target: sigma-2 receptor; lysosome-destabilizing agentsiramesine can induce rapid cell death in a number of cell lines at concentrations above 20 μM. In HaCaT cells, cell death was accompanied by caspase activation, rapid loss of mitochondrial membrane potential (MMP), cytochrome c release, cardiolipin peroxidation and typical apoptotic morphology, whereas in U-87MG cells most apoptotic hallmarks were not notable, although MMP was rapidly lost [1]. Siramesine, a sigma-2 receptor agonist originally developed as an anti-depressant, can induce cell death in transformed cells through a mechanism involving lysosomal destabilization [2].in vivo: SA4503 or siramesine given jointly with MEM (as well as with AMA) decreased the immobility time in rats. The effect of SA4503 and AMA co-administration was antagonized by progesterone, a sigma1 receptor antagonistic neurosteroid. Combined treatment with siramesine and AMA was modified by neither progesterone nor BD1047 (a novel sigma antagonist with preferential affinity for sigma1 sites) [3]
Sigma-2 Radioligand 1 (compound 1) is a Sigma-2 selective ligand. Sigma-2 Radioligand 1 has good biodistribution in mice and good in vivo activity in rats. [18F] Modified Sigma-2 Radioligand 1 for visualization of tumors in micro-PET/CT imaging, exhibiting high tumor uptake and tumor-to-background ratio. Experiments show that Sigma-2 Radioligand 1 binds highly specifically in U87MG glioma xenografts[1].
PD 144418 oxalate is a highly affinity, potent and selective sigma 1 (σ1) receptor ligand (Ki values of 0.08 nM and 1377 nM for σ1 and σ2 respectively). PD 144418 oxalate devoids of any significant affinity for other receptors, ion channels and enzymes. PD 144418 oxalate shows potential antipsychotic activity[1][2].
SKF83959 is a potent and selective dopamine D1-like receptor partial agonist. SKF83959 Ki values for rat D1, D5, D2 and D3 receptors are 1.18, 7.56, 920 and 399 nM, respectively. SKF83959 is a potent allosteric modulator of sigma (σ)-1 receptor. SKF83959 belongs to benzazepine family and has improvements on cognitive dysfunction. SKF83959 can be used for the research of Alzheimer's disease and depression[1][2][3][4].
Sigma-LIGAND-1 hydrochloride is a selective sigma receptor ligand with an IC50s of 16 nM, 19 nM at the DTG site and the PPP site, respectively. Sigma-LIGAND-1 hydrochloride has a Ki of 4000 nM at the dopamine D2 receptor[1].
OPC-14523 hydrochloride is an orally active sigma and 5-HT1A receptor agonist, with high affinity for sigma receptors (σ1/2 IC50=47/56 nM), the 5-HT1A receptor (IC50=2.3 nM), and the 5-HT transporter (IC50=80 nM). OPC-14523 hydrochloride shows antidepressant-like activity[1][2].
OPC-14523 free base is an orally active sigma and 5-HT1A receptor agonist, with high affinity for sigma receptors (σ1/2 IC50=47/56 nM), the 5-HT1A receptor (IC50=2.3 nM), and the 5-HT transporter (IC50=80 nM). OPC-14523 free base shows antidepressant-like activity[1][2].
AVex-73 hydrochloride is a Sigma-1 Receptor agonist with an IC50 of 860 nM.
PB28 is a cyclohexylpiperazine derivative and a high affinity and selective sigma 2 (σ2) receptor agonist with a Ki of 0.68 nM. PB28 is also a σ1 antagonist with a Ki of 0.38 nM. PB28 is less affinity for other receptors. PB28 inhibits electrically evoked twitch in guinea pig bladder and ileum with EC50 values of 2.62 μM and 3.96 μM, respectively. PB28 can modulate SARS-CoV-2-human protein-protein interaction. PB28 induces caspase-independent apoptosis and has antitumor activity[1][2][3][4][5].
SARS-CoV-2-IN-57 (compound (+)-R-26) is a potent inhibitor of SARS-CoV-2 (IC50: 80 nM). SARS-CoV-2-IN-57 has high affinity for Sigma Receptor with Kis of 13.6 nM (S1R) and 14.4 nM (S2R) respectively[1].
PRE-084 hydrochloride is a high affinity, selective σ1 agonist, has an IC50 of 44 nM in the sigma receptor assay.IC50 value: 44 nMTarget: sigma receptorin vitro: PRE-084 has an IC50 of more than 100,000 nM for PCP receptors and an IC50 higher than 10,000 nM in a variety of other receptor systems. [1]in vivo: PRE-084 improves motor neuron survival and motor performance in wobbler mice. PRE-084 enhances BDNF-mediated trophic support.[2]
Blarcamesine (AVex-73;AE-37) is an orally bioavailable Sigma-1 receptor agonist and muscarinic receptor modulator, with anticonvulsant, anti-amnesic, neuroprotective and antidepressant properties. Blarcamesine ameliorates neurologic impairments in a mouse model of Rett syndrome[1].
UNC0642 is a potent and selective G9a/GLP inhibitor, with an IC50 of less than 2.5 nM.
4-IBP is a selective σ1 agonist with a high level of affinity for the σ1 receptor (Ki = 1.7 nM) and a moderate affinity for the σ2 receptor (Ki = 25.2 nM) .IC50 value: 1.7 nM (Ki)Target: σ1in vitro: 4-IBP is a σ1 receptor agonist, decreases the migration of human cancer cells, including glioblastoma cells. 4-IBP is used to investigate whether targeting theσ1 receptor could modify in vitro the migration rates of human cancer cells and increase the sensitivity of metastasizing human A549 NSCLC cells and infiltrating human glioblastoma cells to cytotoxic insults of either proapoptotic or proautophagic drugs.[1]in vivo: 4-IBP increases the antitumor effects of temozolomide and irinotecan in immunodeficient mice that were orthotopically grafted with invasive cancer cells.[1]
(2S,3S)-E1R (Compound 2d) is an enantiomer of E1R. (2S,3S)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) for the treatment of cognition/memory disorders[1].
Phenyltoloxamine (Bistrimin) is an antihistamine agent with sedative and analgesic effects. Phenyltoloxamine also has potent Sigma-1 receptor binding affinity (Ki: 160 nM)[1][2][3].
Dimemorfan phosphate is a sigma 1 receptor agonist, used as a potent antitussive.
PRE-084 is a highly selective σ1 receptor (S1R) agonist, with an IC50 of 44 nM. PRE-084 exhibits good neuroprotective effects, can improve motor function and motor neuron survival in mice. PRE-084 also can ameliorate myocardial ischemia-reperfusion injury in rats by activating the Akt-eNOS pathway[1][2][3][4].
Ditolylguanidine (1,3-Di-o-tolylguanidine; DTG) is an agonist of sigma receptor (σ1/σ2 receptor)[1].
Pentoxyverine-d8 (Carbetapentane-d8) is the deuterium labeled Pentoxyverine. Pentoxyverine (Carbetapentane) is a sigma-1 receptor agonist, with a Ki of 75 nM on guinea-pig brain membranes. Pentoxyverine is a centrally-acting cough suppressant with antimuscarinic and anticonvulsant properties. Pentoxyverine can be used for inhibiting bronchial interceptor, weakening of cough reflex, bronchial smooth muscle relaxation and reduction of airway resistance[1][2][3][4].
KSK68 is a high-affinity dual sigma-1 and histamine H3 receptor antagonist, with Kis of 7.7, 3.6, 22.4 nM for H3 receptor, sigma-1, sigma-2 receptor respectively. KSK68 has negligible affinity at the other histamine receptor subtypes. KSK68 can be used for research of nociceptive and neuropathic pain[1].
DuP 734 is a sigma receptor antagonist. DuP 734 is a selective and potent sigma and 5-HT2 receptor ligand with weak affinity for D2 receptors. DuP 734 may have antipsychotic activity without the liability of motor side effects typical of neuroleptics[1][2][3].
KSK67 is a high-affinity dual sigma-2 and histamine H3 receptor antagonist, with Kis of 3.2, 1531, 101 nM for H3 receptor, sigma-1, sigma-2 receptor respectively. KSK67 can be used for research of nociceptive and neuropathic pain[1].
S1RA(E-52862) is a potent and selective sigma-1 receptor(σ1R, Ki=17 nM) antagonist, showed good selectivity against σ2R (Ki > 1000 nM).IC50 value: 17 nM (Ki) [1]Target: σ1Rin vitro: S1RA behaved as a highly selective σ1 receptor antagonist. It showed high affinity for human (Ki= 17 nM) and guinea pig (Ki= 23.5 nM) σ1 receptors but no significant affinity for the σ2 receptors (Ki > 1000 nM for guinea pig and rat σ2 receptors). Moderate affinity (Ki= 328 nM) and antagonistic activity, with very low potency (IC50= 4700 nM) was found at the human 5-HT2B receptor. S1RA showed no significant affinity (Ki > 1 μM or % inhibition at 1 μM < 50%) for other additional 170 targets (receptors, transporters, ion channels and enzymes) [2].in vivo: Control (non-operated) and nerve-injured mice received a single or repeated (twice daily for 12 days) i.p. administration of S1RA at 25 mg·kg?1, the same dose used for the assessment of behavioural hypersensitivity in the chronic treatment study. Acute treatment was given on day 12 post-surgery and repeated treatment with S1RA started the day of surgery, as in the behavioural studies [2]. Intrathecal pre-treatment with idazoxan prevented the systemic S1RA antinociceptive effect, suggesting that the S1RA antinociception depends on the activation of spinal α2 -adrenoceptors which, in turn, could induce an inhibition of formalin-evoked glutamate release. When administered locally, intrathecal S1RA inhibited only the flinching behavior, whereas intracerebroventricularly or intraplantarly injected also attenuated the lifting/licking behavior [3].
A potent, mixed sigma2 agonist and sigma1 antagonist with Ki of 0.28 and 13.0 nM, respectively; inhibits cancer cell growth, modulates P-glycoprotein, and synergizes with doxorubicin in MCF7 and MCF ADR cells with IC50 in nanomolar range; increase G0-G1-phase fraction and caspase-independent apoptosis, also reduces P-gp expression.
(2R,3S)-E1R (Compound 2c) is an enantiomer of E1R. (2R,3S)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) for the treatment of cognition/memory disorders[1].
WLB-89462 (Compound 20c) is a selective σ2 receptor ligand (Ki: 13 nM). WLB-89462 has neuroprotective activity. WLB-89462 improves short-term memory impairment induced by Aβ peptide in rats. WLB-89462 has good ADMET profile (good solubility, no CYP inhibition, good metabolic stability, high permeability, brain penetration, and high oral exposure in rodents)[1].
PD 144418 is a highly affinity, potent and selective sigma 1 (σ1) receptor ligand (Ki values of 0.08 nM and 1377 nM for σ1 and σ2 respectively), devoid of any significant affinity for other receptors, ion channels and enzymes. PD 144418 shows potential antipsychotic activity[1][2].