radioligand

Sigma-2 Radioligand 2 (compound 4) exhibits low nanomolar affinity for the σ2 receptor (Ki=2.30 nM) and high subtype selectivity (Ki(σ1) Ki(σ2) > 1500).

Sigma-2 Radioligand 1 (compound 1) serves as a selective Sigma-2 ligand, demonstrating favorable biodistribution in mice and robust in vivo activity in rats. The [18F] modified version of Sigma-2 Radioligand 1 enhances the visualization of tumors in micro-PET CT imaging by providing high tumor uptake and an impressive tumor-to-background ratio. Additionally, experiments confirm that this compound binds with high specificity to U87MG glioma xenografts [1].

CB2 PET Radioligand 1 (compound [18F]9) is a positron emission tomography (PET) radioligand with high affinity for the human cannabinoid receptor 2 (hCB2, Ki=7.7 nM). It is synthesized via Cu-mediated 18F-fluorination and demonstrates significant brain uptake in a mouse model of neuroinflammation [1].

MRS 1754 is a selective antagonist radioligand for the A2B adenosine receptor, exhibiting very low affinity for A1 and A3 receptors in both humans and rats.

(S)-Desmethyl-NNC112 ((+)-Desmethyl-NNC112) is a selective PET radioligand that binds to D-dopamine receptors.

Lusaperidone (R107474) is a potent α2-adrenergic receptor antagonist, a potential radioligand for the α (2)-adrenergic receptor, with inhibitory effects on α2A and α2C, with Ki values of 0.13 and 0.15 nM, respectively.

Arotinolol hydrochloride(Arotinolol HCl) is a non-selective α β-adrenergic receptor blocker.Arotinolol hydrochloride inhibits the binding of the radioligand 125I-ICYP to the 5HT1B-hydroxytryptamine receptor. Arotinolol hydrochloride is an antihypertensive and anti-obesity agent that improves aortic stiffness in rats and is used to study obesity-related diseases.

3-aminopropylphosphonic acid (3-APPA) is a phosphonic analog of GABA that acts as a partial agonist of GABAB receptors (IC50 = 1.5 μM in a radioligand binding assay).

Leucomycin A13 is a macrolide antibiotic and a component of the leucomycin complex originally isolated from S. kitasatoensis. It is active against B. subtilis, S. aureus, M. luteus, and E. coli with MIC values of 0.16, 0.16, 0.08, and >10 μg ml, respectively. It binds to ribosomes with an IC50 value of 1.2 μM in a radioligand binding assay.

Deltorphin II is a peptide agonist of δ2-opioid receptors.1,2It is selective for δ-opioid receptors over μ- and κ-opioid receptors in radioligand bindings assays (Kis = 0.0033, >1, and >1 μM, respectively) and induces [35S]GTPγS binding in mouse brain membrane preparations (EC50= 0.034 μM). Deltorphin II (0.12 mg/kg) decreases the infarction zone:risk zone ratio in a rat model of myocardial ischemia-reperfusion injury induced by coronary occlusion, an effect that can be reversed by the δ2-opioid receptor antagonist naltriben but not the δ1-opioid receptor antagonist BNTX.3Intrathecal administration of deltorphin II (15 μg/animal) increases latency to withdraw in the paw pressure and tail-flick tests in rats.4 1.Raynor, K., Kong, H., Chen, Y., et al.Pharmacological characterization of the cloned κ-, δ-, and μ-opioid receptorsMol. Pharm.45(2)330-334(1994) 2.Scherrer, G., Befort, K., Contet, C., et al.The delta agonists DPDPE and deltorphin II recruit predominantly mu receptors to produce thermal analgesia: A parallel study of mu, delta and combinatorial opioid receptor knockout miceEur. J. Neurosci.19(8)2239-2248(2004) 3.Maslov, L.N., Barzakh, E.I., Krylatov, A.V., et al.Opioid peptide deltorphin II simulates the cardioprotective effect of ischemic preconditioning: role of δ2-opioid receptors, protein kinase C, and KATP channelsBull. Exp. Biol. Med.149(5)591-593(2010) 4.Labuz, D., Toth, G., Machelska, H., et al.Antinociceptive effects of isoleucine derivatives of deltorphin I and deltorphin II in rat spinal cord: A search for selectivity of delta receptor subtypesNeuropeptides32(6)511-517(1998)

PAR2 (1-6) amide is a synthetic peptide agonist of proteinase-activated receptor 2 (PAR2) that corresponds to residues 1-6 of the amino terminal tethered ligand sequence of human PAR2 and residues 37-42 of the full-length sequence.1It binds to NCTC 2544 cells expressing human PAR2 (Ki= 9.64 μM in a radioligand binding assay) and induces calcium mobilization in the same cells (EC50= 0.075 μM).2PAR2 (1-6) amide (100 μM) reduces colony formation of A549 lung cancer cells.1It induces superoxide production and degranulation in isolated human eosinophils when used at a concentration of 500 μM.3PAR2 (1-6) amide (5 μmol/kg) induces tear secretion in rats when used in combination with amastatin .4 1.Bohm, S.K., Kong, W., Bromme, D., et al.Molecular cloning, expression and potential functions of the human proteinase-activated receptor-2Biochem. J.314(Pt 3)1009-1016(1996) 2.Kanke, T., Ishiwata, H., Kabeya, M., et al.Binding of a highly potent protease-activated receptor-2 (PAR2) activating peptide, [3H]2-furoyl-LIGRL-NH2, to human PAR2Br. J. Pharmacol.145(2)255-263(2005) 3.Miike, S., McWilliam, A.S., and Kita, H.Trypsin induces activation and inflammatory mediator release from human eosinophils through protease-activated receptor-2J. Immunol.167(11)6615-6622(2001) 4.Nishikawa, H., Kawai, K., Tanaka, M., et al.Protease-activated receptor-2 (PAR-2)-related peptides induce tear secretion in rats: Involvement of PAR-2 and non-PAR-2 mechanismsJ. Pharmacol. Exp. Ther.312(2)324-331(2005)

N-(1-(3,4-Dihydroxyphenyl)propan-2-yl)oleamide binds to the cannabinoid 1 (CB1) receptor with a Ki value of 365 nM in a radioligand binding assay using rat brain homogenate. It has an EC50 value of 698 nM for the peroxisome proliferator-activated receptor α (PPARα) in a luciferase reporter assay and, in rats, it decreases food intake. It does not inhibit fatty acid amide hydrolase (FAAH).

Taurolithocholic Acid-d5 Sodium Salt (Major) is a deuterated compound of Taurolithocholic Acid Sodium Salt. Taurolithocholic Acid Sodium Salt has a CAS number of 6042-32-6. The major human metabolite, a bile acid which inhibits radioligand binding to muscarinic M1, but not to M2 or M3 receptors.

GSK-215083 is a PET radioligand for the 5-HT6 receptor. GSK 215083 is a quinoline based compounds and acts by antagonising the 5-HT6 receptor. GSK-215083 binds to receptors 5-hydroxytrypamine-6 (5HT6) in the striatum and 5-hydroxytryptamine-2A (5HT2A) in

AZD-2184 is a radioligand for detecting beta-amyloid deposits.

SB 224289 is a selective antagonist of 5-HT1B receptor with pKi of 8.2. It is a centrally active following oral administration in vivo. SB 224289 displays 60-fold selectivity over 5-HT1D, 5-HT1A, 5-HT1E, 5-HT1F, 5-HT2A and 5-HT2C receptors in radioligand

Mefway F-18 is a PET radioligand specific to serotonin-1A receptors.

Altanserin can binds to the 5-HT2A receptor. Labeled with the isotope fluorine-18 it is used as a radioligand in positron emission tomography (PET) studies of the brain.

RBP4 ligand-1 is a non-retinoid ligand for retinol-binding protein 4 (RBP4). It exhibits hRBP4SPA IC50 and RBP4-TTR FRET IC50 values of 0.23±0.11 μM and 0.13±0.12 μM, respectively, in radioligand binding and FRET assays. The measured concentration was 0.12 μM.

ORM-13070 is a selective antagonist radioligand for the α2C adrenoceptor subtype. ORM-13070 C-11 is under investigation in clinical trial.

ER176 is a novel PET radioligand utilized for the visualization of 18 kDa translocator protein (TSPO), a neuroinflammation biomarker, marking the advancement in imaging technology.

PK14105 has been evaluated biologically as a potential radioligand for positron emission tomography (PET) studies targeting peripheral benzodiazepine binding sites (PBBS) receptors. When administered to rats with unilaterally lesioned striata, PK14105 was observed to quickly cross the blood-brain barrier, displaying significant radioactivity retention in the lesioned striatum, in contrast to the unlesioned striatum or cerebellar vermis. Additionally, PK14105 has the capability to inhibit receptor ligands, calcium channel ligands, and co-transporters in all salivary glands.

STING18 is a competitive ligand of stimulator of interferon genes (STING; IC50 = 0.068 μM in a radioligand binding assay).1 It inhibits cGAMP-induced IFN-β production (IC50 = 11 μM) but does not stimulate IFN-β production (EC50 = >30 μM) in THP-1 cells. |1. Siu, T., Altman, M.D., Baltus, G.A., et al. Discovery of a novel cGAMP competitive ligand of the inactive form of STING. Med. Chem. Lett. 10(1), 92-97 (2019).

Atomoxetine-d3 hydrochloride, the deuterium-labeled form of Atomoxetine hydrochloride, acts as a potent and selective noradrenalin re-uptake inhibitor with Ki values of 5, 77, and 1451 nM for the inhibition of radioligand binding to human NET, SERT, and DAT, respectively [1] [2].