2. Signaling Pathways
  3. GPCR/G Protein
    Neuronal Signaling
  4. Opioid Receptor
  5. κ Opioid Receptor/KOR Isoform
  6. κ Opioid Receptor/KOR Antagonist

κ Opioid Receptor/KOR Antagonist

κ Opioid Receptor/KOR Antagonists (18):

Cat. No. Product Name Effect Purity
  • HY-100903
    Norbinaltorphimine dihydrochloride
    		Antagonist 98.91%
    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.
  • HY-101718
    Aticaprant
    		Antagonist 99.59%
    Aticaprant (CERC-501) is a potent and centrally-penetrant kappa opioid receptor antagonist with a Ki of 0.807 nM.
  • HY-76711
    Naltrexone
    		Antagonist 99.94%
    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.
  • HY-117040
    nor-Binaltorphimine
    		Antagonist 98.70%
    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.
  • HY-114072
    J-113397
    		Antagonist 99.00%
    J-113397 is the first potent and selective nonpeptidyl ORL1 receptor antagonist (Ki: cloned human ORL1=1.8 nM) without any agonistic effects on other opioid receptors.
  • HY-118949
    LY255582
    		Antagonist 98.0%
    LY255582 is a pan-opioid antagonist and has high affinity for mu, delta, and kappa receptors (Ki: 0.4 nM, 5.2, 2.0 nM respectively). LY255582 can decrease food intake and body weight. LY255582 can be used for the research of obesity.
  • HY-135230
    LY2444296
    		Antagonist 99.26%
    LY2444296 is an orally bioavailable, high-affinity and selective short-acting kappa opioid receptor (KOPR) antagonist, with a Ki value of ～1 nM. LY2444296 exhibits anti-anxiety like effects.
  • HY-101223
    DIPPA hydrochloride
    		Antagonist 99.7%
    DIPPA hydrochloride is an irreversible, long-lasting, selective and high affinity κ-opioid receptor antagonist. DIPPA hydrochloride can be used for the research of anxiety and antidepressant.
  • HY-123689S1
    Samidorphan-d5
    		Antagonist
    Samidorphan-d5 (ALKS-33-d5) is is a deuterated compound of Samidorphan. Samidorphan is an orally active opioid system modulator that binds with high affinity to μ-opioid, κ-opioid, and δ-opioid receptors. Samidorphan is a μ-opioid receptor antagonist and a partial agonist at k-opioid and δ-opioid receptors. Samidorphan acts primarily as an opioid receptor antagonist in vivo.
  • HY-15691
    PF-04455242
    		Antagonist
    PF-04455242 is an orally bioavailable, blood-brain barrier-permeable κ-opioid receptor (KOR) inhibitor. PF-04455242 blocks in vivo effects induced by KOR and MOR agonists, and elicits KOR-independent outward currents in ventral tegmental area neurons. PF-04455242 promotes energy expenditure and activates the hypothalamic mTOR pathway. PF-04455242 attenuates stress-induced behavioral effects and produces antidepressant-like effects. PF-04455242 can be used in studies related to pain, depression, addictive disorders, and obesity induced by estrogen withdrawal.
  • HY-106732
    AT-076
    		Antagonist
    AT-076 is an opioid pan antagonist at nociception, kappa, mu, and delta opioid receptors, with Ki values of 1.75 nM (NOP), 1.67 nM (MOP), 1.14 nM (KOP) and 19.6 nM (DOP), respectively.
  • HY-118615
    LY2048978
    		Antagonist
    LY2048978 is a non-selective opioid receptor antagonist with Ki of 0.287, 0.471 and 1.05 nM for human mu, kappa and delta opioid receptors in vitro, respectively. LY2048978 can be used in the research of major depressive disorder and alcohol use disorder.
  • HY-175661
    SRI-22136
    		Antagonist
    SRI-22136 is a Delta Opioid Receptor (DOR) antagonist that can cross blood-brain barrier with a IC50 of 0.42 nM. SRI-22136 does not have agonistic activity but antagonistic activity against DOR, MOR (IC50 = 370 nM), KOR (IC50 = 54 nM) and can avoid addiction/aversion effects. SRI-22136 can effectively inhibit the BACE1 activity induced by DADLE (a DOR agonist) (HY-105343) (IC50 = 120 nM). SRI-22136 prevents completely Alzheimer’s-like pathology in mouse model. SRI-22136 can used for the study of Alzheimer’s disease.
  • HY-135698
    Methocinnamox
    		Antagonist
    Methocinnamox (M-CAM) a selective and long-acting μ-opioid receptor (MOR) antagonist with a Ki of 0.6 nM. Methocinnamox binds to the orthosteric site of the MOR in a pseudo-irreversible, non-covalent manner, resulting in prolonged receptor blockade that persists until new receptors are synthesized. Methocinnamox acts as a reversible antagonist at both the kappa-opioid receptor (KOR) (Ki = 4.9 nM) and delta-opioid receptor (DOR) (Ki = 2.2 nM), and it exhibits no intrinsic agonist activity at these receptors. Methocinnamox can be used to reverse and prevent opioid overdose and addiction.
  • HY-179282
    Mu opioid receptor antagonist 9
    		Antagonist
    Mu opioid receptor antagonist 9 is potent, selective and CNS-pentrant mu-opioid receptor (MOR) antagonist with a Ki of 77.3 nM. Mu opioid receptor antagonist 9 exhibits selectivity over kappa-opioid receptor (KOR), and delta-opioid receptor (DOR). Mu opioid receptor antagonist 9 effectively blocks the antinociceptive effects of psychoactive substances. Mu opioid receptor antagonist 9 can reverse psychoactive substances-induced respiratory depression in mice. Mu opioid receptor antagonist 9 can be used for the research of Opioid Use Disorder (OUD).
  • HY-136786
    RU-24213 hydrochloride
    		Antagonist
    RU-24213 hydrochloride is a selective D-2 dopamine receptor agonist. RU-24213 hydrochloride is also a KAPPA-opioid receptor antagonist. RU-24213 hydrochloride induces stereotyped behaviors.
  • HY-16765
    Axelopran
    		Antagonist
    Axelopran (TD-1211) is an opioid receptor antagonist with pKi values of 9.8, 8.8 and 9.9 for human recombinant μ and δ receptors and guinea pig κ receptor, respectively.
  • HY-107121
    Ondelopran
    		Antagonist
    Ondelopran (LY 2196044) is a non-selective opioid receptor antagonist. Ondelopran inhibits the release of dopamine in the nucleus accumbens induced by alcohol, reduces the rewarding effect of alcohol consumption, and lowers the craving. Ondelopran can be used for alcohol use disorder (AUD).