Recombinant Human Kappa-type opioid receptor (OPRK1)

1. The OPRK1 gene variants showed significant association with susceptibility to opioid dependence among Iranians. PMID: 28786760
2. Down-regulation of KOR in HCC tumour tissues has a strong association with poor prognosis and KOR might be a potential tumour suppressor. PMID: 28821282
3. In HUVEC cells subjected to artificial hyperlipidemia, selective agonists and antagonists showed that kappa-opioid receptor stimulation normalizes endothelial ultrastructure and function under hyperlipidemic conditions via the PI3K/Akt/eNOS pathway. PMID: 27226238
4. The OPRK1/kappa-opioid receptor pathway was found to be downregulated in lesional skin of psoriasis, correlating positively with itch sensation. PMID: 27958613
5. These results indicate that KOR can form a heterodimer with B2R and this leads to increased protein kinase A activity by the CREB signaling pathway, leading to a significant increase in cell proliferation. PMID: 28069442
6. that promoter fragments of OPRK1 and OPRM1 were able to upregulate gene expression with mild cognitive impairment PMID: 27838450
7. Hypoxia inducible factor-1alpha (HIF-1alpha) siRNA knocked down the increase of endogenous HIF-1alpha messages and diminished the desferrioxamine (DFO)-induced increase of kappa-opioid receptor (hKOR) expression. PMID: 28117678
8. genetic association studies in a population in Denmark: Data suggest that carriers/heterozygotes of the C allele (CC/CT) of OPRK SNP rs6473799 report a 30.4% higher mechanical visceral pain tolerance threshold than non-carriers. PMID: 27061127
9. Molecular switches of the kappa opioid receptor triggered by 6'-GNTI and 5'-GNTI have been described. PMID: 26742690
10. data provide evidence for genetic modulation of opioid withdrawal severity. PMID: 26692286
11. OPRK1 promoter hypermethylation might increase the risk of AD through its regulation on the gene expression of OPRK1. PMID: 26300544
12. OX1R and KOR heterodimerize, and this heterodimer associates with Galphas, leading to increased protein kinase A (PKA) signaling pathway activity, including upregulation of intracellular cAMP levels. PMID: 25866368
13. The structure of the dynorphin (1-13) peptide (dynorphin) bound to the human kappa opioid receptor (KOR) has been determined by liquid-state NMR spectroscopy. PMID: 26372966
14. RGS2 and RGS4 are new interacting partners that play key roles in G protein coupling to negatively regulate kappa-OmicronR signaling. PMID: 25289860
15. Data show that the crystallographic structures of the mouse mu-opioid receptor (MOPr) and human kappa-opioid receptor (KOPr) indicate putative interfacial interactions. PMID: 24651466
16. Here we describe three experimental procedures we used to evaluate the interaction between hKOPR and 14-3-3zeta: co-immunoprecipitation, pull-down assay and immunofluorescence microscopy. PMID: 25293321
17. Studied differential DNA-protein interactions of PDYN and OPRK1 SNPs significantly associated with alcohol dependence. PMID: 25177835
18. Results suggest that Kappa receptor availability in an amygdala-cingulate cortex-striatal circuit mediates the phenotypic expression of trauma-related loss (ie, dysphoria) symptoms. PMID: 25229257
19. Low OPRK1 expression is associated with liver metastases of small bowel neuroendocrine tumors. PMID: 25241033
20. Data indicate that replacement of the 3-hydroxyl substituent of the 4-(3-hydroxyphenyl) group of JDTic with a H, F, or Cl substituent leads to potent and selective kappa opioid receptor (KOR) antagonists. PMID: 25133923
21. findings suggest that genetic polymorphisms in OPRK1 were associated with the body weight, alcohol use, and opioid withdrawal symptoms in MMT patients. PMID: 24525640
22. Suggest that methamphetamine induced early autophagic response is a survival mechanism for apoptotic endothelial cells and is mediated through the kappa opioid receptor. PMID: 24603327
23. In heroin-dependent patients, no difference was evidenced between responders and non-reponders to buprenorphine therapy in the frequency of OPRK1 SNP. PMID: 24274990
24. Neurocognitive and neuroinflammatory correlates of OPRK1 mRNA expression in the anterior cingulate in postmortem brain of HIV-infected subjects. PMID: 24405578
25. This study indicates that a patient's OPRK1 genotype could be used to identify a subset of individuals for whom vaccine treatment may be an effective pharmacotherapy for cocaine dependence. PMID: 23995774
26. OPRK1 rs6989250 C>G is associated with stress-induced craving and cortisol, hyperactive hypothalamus/thalamus-midbrain-cerebellum responses, and also associated with greater subsequent cocaine relapse risk. PMID: 23962922
27. Data suggest that dynorphin A (DynA) is ligand for opioid receptor kappa (KOR); upon DynA binding, only small chemical shifts observed in second extracellular loop of KOR; chemical shift changes of DynA show conclusively that DynA interacts with KOR. PMID: 24616919
28. crystal structure provides fundamental insights into the activation mechanism of the kappa-opioid receptor and suggest that "functional" residues may be directly involved in transduction of the agonist binding event PMID: 24121503
29. Kappa Opioid receptor in the nucleus is a novel prognostic factor of esophageal squamous cell carcinoma. PMID: 23574786
30. OPRK1 and PDYN polymorphisms may alter severity of HIV infection and response to treatment. PMID: 23392455
31. Pairwise tag single nucleotide polymorphisms (SNPs) in DREAM, PDYN and OPRK1 were genotyped in a United Kingdom population-based discovery cohort in whom pain was assessed. PMID: 22730276
32. hKOR activates p38 MAPK through a phosphorylation and arrestin-dependent mechanism; however, activation differs between hKOR and rKOR for some ligands PMID: 23086943
33. Data indicate that 14-3-3zeta interaction with kappa-opioid receptor (hKOPR) C-tail promotes export of hKOPR. PMID: 22989890
34. A role is estsablished for dynorphin kappa-opioid receptor signaling in fear extinction. PMID: 22764240
35. crystal structure of the human kappa-OR in complex with the selective antagonist JDTic, arranged in parallel dimers, at 2.9 A resolution PMID: 22437504
36. Human apelin forms a heterodimer with the kappa opioid receptor and leads to increased protein kinase C and decreased protein kinase A. PMID: 22200678
37. In summary, this study provides evidence that gene-gene interaction between KOR and OPRM1 can influence the risk of addiction to narcotics and alcohol. PMID: 22138325
38. These findings provide evidence that previously demonstrated KOR-mediated reduction in intraocular pressure could be caused, in part, by NO production in both the ciliary body and the trabecular meshwork. PMID: 21666232
39. This is the first report detailing the initiation of a KOR-induced JAK2/STAT3 and IRF2 signaling cascade, and these pathways result in substantial down-regulation of CXCR4 expression. PMID: 21447649
40. because of its stronger binding for hKOPR, GEC1 is able to be recruited by hKOPR sufficiently without membrane association via its C-terminal modification; however, du GABARAP appears to require C-terminal modifications to enhance KOPR expression. PMID: 21388957
41. Review. kappa-Opioid receptor signaling and brain reward function. PMID: 19804796
42. phosphorylation of serine 369 mediates KOR desensitization and internalization PMID: 12815037
43. binding of the KOR to NHERF-1/EBP50 facilitates oligomerization of NHERF-1/EBP50, leading to stimulation of NHE3. PMID: 15070904
44. OPKR1 structure and association of haplotypes with opiate addiction was found to have empirical significance. PMID: 15608558
45. The diterpenoid salvinorin A utilizes unique residues within a commonly shared binding pocket to selectively activate KORs. PMID: 15952771
46. GEC1 interacts with the kappa opioid receptor and enhances expression of the receptor PMID: 16431922
47. Family-based analyses demonstrated associations between alcohol dependence and multiple SNPs in intron 2 of OPRK1. PMID: 16924269
48. Helical orientation of helix 2 are critical for the selectivity of salvinorin A binding to KOR and provide a structurally novel basis for ligand selectivity. PMID: 17121830
49. frequency of KOR 36G > T SNP was significantly higher among heroin-dependent individuals compared with control subjects PMID: 17373729
50. activation of KORs alters functional properties of neural precursor cells that are relevant to human brain development and repair. PMID: 17538007

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HGNC: 8154

OMIM: 165196

KEGG: hsa:4986

STRING: 9606.ENSP00000265572

UniGene: Hs.106795