Opioid Receptor Antagonist

Naloxone hydrochloride is an antagonist of Opioid receptor. Naloxone hydrochloride alleviates opioid-overdose-induced respiratory depression. Naloxone hydrochloride may cause pulmonary edema and cardiac arrhythmias.

Naloxone is an antagonist of Opioid receptor. Naloxone alleviates opioid-overdose-induced respiratory depression. Naloxone may cause pulmonary edema and cardiac arrhythmias.

Norbinaltorphimine dihydrochloride (nor-Binaltorphimine dihydrochloride; nor-BNI dihydrochloride) is a selective, long-acting competitive antagonist of the κ-opioid receptor. Norbinaltorphimine dihydrochloride blocks κ-opioid receptor-mediated analgesic effects, and inhibits butorphanol-induced changes in κ-opioid receptor binding kinetics, desensitization and down-regulation. Norbinaltorphimine dihydrochloride suppresses specific opioid withdrawal symptoms, precipitates withdrawal behaviors in butorphanol-dependent rats, and serves as a molecular probe for studying κ-opioid receptor-agonist interactions. Norbinaltorphimine dihydrochloride is applicable to research related to neurological disorders such as pain.

Naltrexone is an orally active, long-acting opioid receptor (opioid receptor) antagonist. Naltrexone blocks the euphoric effects of exogenous opioids and reduces alcohol craving by blocking opioid receptors (μ, κ, and δ) as well as opioid growth factor receptors. Low doses of Naltrexone are used to relieve chronic pain, treat inflammatory diseases and inhibit tumor growth, while high doses or continuous administration exert pro-inflammatory or pro-proliferative effects. Naltrexone relieves intractable pruritus caused by psoriasis, atopic dermatitis and other conditions, and its combination with Bupropion (HY-B0403) inhibits food craving, thereby reducing body weight.

Aticaprant (CERC-501) is a potent and centrally-penetrant kappa opioid receptor antagonist with a K_i of 0.807 nM.

JDTic (dihydrochloride) is a potent antagonist of kappa-opioid receptors (KOR), blocking the κ-agonist U50, 488-induced antinociception.

JTC-801 is a selective opioid receptor-like1 (ORL1) receptor antagonist, binding to ORL1 receptor with a K_i value of 8.2 nM.

Naltriben mesylate is a potent δ2-opioid receptor antagonist and a TRPM7 activator. Naltriben mesylate shows K_i values of 0.013 nM, 19 nM and 152 nM for δ, μ and κ receptors, respectively. Naltriben mesylate enhances glioblastoma cell migration and invasion. Naltriben mesylate can be used in research into neurological diseases and cancer.

Naloxegol oxalate (NKTR-118 oxalate; AZ-13337019 oxalate) is an orally active peripherally acting μ-opioid receptor antagonist with a target K_i of 7.42 nM. Naloxegol oxalate inhibits the binding of opioids to μ-opioid receptors in the gastrointestinal tract, and alleviates opioid-induced gastrointestinal hypomotility, delayed transit, hypertonicity, and increased fluid reabsorption. Naloxegol oxalate is applicable to research related to opioid-induced constipation.

nor-Binaltorphimine (Norbinaltorphimine; NorBNI) is a selective, long-acting competitive antagonist of the κ-opioid receptor. nor-Binaltorphimine blocks κ-opioid receptor-mediated analgesic effects, and inhibits butorphanol-induced changes in κ-opioid receptor binding kinetics, desensitization and down-regulation. nor-Binaltorphimine suppresses specific opioid withdrawal symptoms, precipitates withdrawal behaviors in butorphanol-dependent rats, and serves as a molecular probe for studying κ-opioid receptor-agonist interactions. nor-Binaltorphimine is applicable to research related to neurological disorders such as pain.

Naldemedine (S-297995) tosylate is an orally active μ-opioid receptor antagonist (PAMORA). Naldemedine tosylate shows potent binding affinities (K_i=0.34, 0.43, 0.94 nM, respectively) and antagonist activities (IC₅₀=25.57, 7.09, 16.1 nM, respectively) for recombinant human μ-, δ-, and κ- opioid receptors. Naldemedine can be used in opioid-induced constipation (OIC) research. Naldemedine tosylate is predicted to bind to 3CL^pro encoded by SARS-CoV2 genome.

CTAP TFA is a potent, highly selective, and BBB penetrant μ opioid receptor antagonist, with an IC₅₀ of 3.5 nM. CTAP TFA displays over 1200-fold selectivity over δ opioid (IC₅₀=4500 nM) and somatostatin receptors. CTAP TFA can be used for the study of L-DOPA-induced dyskinesia (LID) and opiate overdose or addiction.

Alvimopan (ADL 8-2698) is a potent, selective, orally active and reversible μ-opioid receptor antagonist, with an IC₅₀ of 1.7 nM. Alvimopan has selectivity for μ-opioid receptor (K_i=0.47 nM) over κ- and δ-opioid receptors (K_is=100, 12 nM, respectively). Alvimopan can be used for the research of postoperative ileus.

Naloxone methiodide is a peripherally restricted, nonselective, and competitive opioid receptor antagonist. Naloxone methiodide does not penetrate the blood-brain barrier.

LY2940094 (BTRX-246040) is a potent, selective and orally available nociceptin receptor (NOP receptor) antagonist with high affinity (K_i=0.105 nM) and antagonist potency (K_b=0.166 nM). LY2940094 reduces ethanol self-administration in animal models.

β-Funaltrexamine (β-FNA) hydrochloride is a blood-brain barrier-permeable, selective and irreversible μ-opioid receptor antagonist with immunomodulatory, anti-inflammatory and neuroprotective activities. β-Funaltrexamine hydrochloride inhibits p38 MAPK and TLR4 signaling by blocking μ-opioid receptors, and reduces the transcriptional activities of NF-κB, AP-1, CREB and Stat. Furthermore, β-Funaltrexamine hydrochloride inhibits iNOS activation and pro-inflammatory microglial polarization, converting microglia to an anti-inflammatory phenotype, thereby downregulating neuroinflammation and ameliorating neuronal degeneration. β-Funaltrexamine hydrochloride is widely applicable to research related to stroke, cerebral ischemia/reperfusion injury and neurodegenerative diseases.

CTOP TFA is a potent and highly selective μ-opioid receptor antagonist. CTOP TFA antagonizes the acute analgesic effect and hypermotility. CTOP TFA enhances extracellular dopamine levels in the nucleus accumbens. CTOP TFA dose-dependently enhances locomotor activity.

BAN ORL 24 is a nociceptin/orphanin FQ (N/OFQ) peptide receptor (NOP) antagonist. BAN ORL 24 has antagonistic effect for nociceptin (NOP) receptor with K_I value of 0.24 nM in CHO cell. BAN ORL 24 can be used for the research of cancer and analgesic.

CTAP is a potent, highly selective, and BBB penetrant μ opioid receptor antagonist, with an IC₅₀ of 3.5 nM. CTAP displays over 1200-fold selectivity over δ opioid (IC₅₀=4500 nM) and somatostatin receptors. CTAP can be used for the study of L-DOPA-induced dyskinesia (LID) and opiate overdose or addiction.

(±)-J-113397 is a potent and selective non-peptidyl ORL1 receptor antagonist with a K_i of 1.8 nM for cloned human ORL1. J-113397 inhibited nociceptin/orphanin FQ-stimulated GTPγS binding to CHO cells expressing ORL1 with an IC₅₀ value of 5.3 nM. J-113397 can be used for researching the physiological roles of nociceptin/orphanin FQ.