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[Arg14,Lys15]Nociceptin

Highly potent and selective NOP agonist CAS# 236098-40-1

[Arg14,Lys15]Nociceptin

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Chemical structure

[Arg14,Lys15]Nociceptin

3D structure

Chemical Properties of [Arg14,Lys15]Nociceptin

Cas No. 236098-40-1 SDF Download SDF
PubChem ID 16143911 Appearance Powder
Formula C82H137N31O22 M.Wt 1909.18
Type of Compound N/A Storage Desiccate at -20°C
Solubility Soluble to 1 mg/ml in water
Sequence FGGFTGARKSARKRKNQ
Chemical Name (2S)-5-amino-2-[[(2S)-4-amino-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2S)-2-[[2-[[(2S,3R)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-phenylpropanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-3-hydroxybutanoyl]amino]acetyl]amino]propanoyl]amino]-5-carbamimidamidopentanoyl]amino]hexanoyl]amino]-3-hydroxypropanoyl]amino]propanoyl]amino]-5-carbamimidamidopentanoyl]amino]hexanoyl]amino]-5-carbamimidamidopentanoyl]amino]hexanoyl]amino]-4-oxobutanoyl]amino]-5-oxopentanoic acid
SMILES CC(C(C(=O)NCC(=O)NC(C)C(=O)NC(CCCNC(=N)N)C(=O)NC(CCCCN)C(=O)NC(CO)C(=O)NC(C)C(=O)NC(CCCNC(=N)N)C(=O)NC(CCCCN)C(=O)NC(CCCNC(=N)N)C(=O)NC(CCCCN)C(=O)NC(CC(=O)N)C(=O)NC(CCC(=O)N)C(=O)O)NC(=O)C(CC1=CC=CC=C1)NC(=O)CNC(=O)CNC(=O)C(CC2=CC=CC=C2)N)O
Standard InChIKey VULLMZOQBGUKAT-VUXBHJHDSA-N
Standard InChI InChI=1S/C82H137N31O22/c1-44(101-63(119)42-100-78(133)65(46(3)115)113-76(131)57(38-48-21-8-5-9-22-48)103-64(120)41-98-62(118)40-99-68(123)49(86)37-47-19-6-4-7-20-47)66(121)104-53(26-16-34-95-80(89)90)70(125)108-52(25-12-15-33-85)74(129)112-59(43-114)77(132)102-45(2)67(122)105-54(27-17-35-96-81(91)92)71(126)106-50(23-10-13-31-83)69(124)109-55(28-18-36-97-82(93)94)72(127)107-51(24-11-14-32-84)73(128)111-58(39-61(88)117)75(130)110-56(79(134)135)29-30-60(87)116/h4-9,19-22,44-46,49-59,65,114-115H,10-18,23-43,83-86H2,1-3H3,(H2,87,116)(H2,88,117)(H,98,118)(H,99,123)(H,100,133)(H,101,119)(H,102,132)(H,103,120)(H,104,121)(H,105,122)(H,106,126)(H,107,127)(H,108,125)(H,109,124)(H,110,130)(H,111,128)(H,112,129)(H,113,131)(H,134,135)(H4,89,90,95)(H4,91,92,96)(H4,93,94,97)/t44-,45-,46+,49-,50-,51-,52-,53-,54-,55-,56-,57-,58-,59-,65-/m0/s1
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.
We recommend that you prepare and use the solution on the same day. However, if the test schedule requires, the stock solutions can be prepared in advance, and the stock solution must be sealed and stored below -20℃. In general, the stock solution can be kept for several months.
Before use, we recommend that you leave the vial at room temperature for at least an hour before opening it.
About Packaging 1. The packaging of the product may be reversed during transportation, cause the high purity compounds to adhere to the neck or cap of the vial.Take the vail out of its packaging and shake gently until the compounds fall to the bottom of the vial.
2. For liquid products, please centrifuge at 500xg to gather the liquid to the bottom of the vial.
3. Try to avoid loss or contamination during the experiment.
Shipping Condition Packaging according to customer requirements(5mg, 10mg, 20mg and more). Ship via FedEx, DHL, UPS, EMS or other couriers with RT, or blue ice upon request.

Biological Activity of [Arg14,Lys15]Nociceptin

DescriptionHighly potent and selective NOP receptor agonist (EC50 = 1 nM). Displays > 875-fold selectivity over opioid receptors (IC50 values are 0.32, 280, > 10000 and 1500 for NOP, μ, δ and κ receptors respectively). Longer lasting and 30-fold more potent than nociceptin in vivo; pronociceptive and inhibits locomotor activity.

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References on [Arg14,Lys15]Nociceptin

Quantitative study of [(pF)Phe4,Arg14,Lys15]nociceptin/orphanin FQ-NH2 (UFP-102) at NOP receptors in rat periaqueductal gray slices.[Pubmed:17976580]

Eur J Pharmacol. 2008 Jan 28;579(1-3):110-5.

The nociceptin/orphanin FQ (N/OFQ) peptide (NOP) receptor is a novel member of the opioid receptor family with little affinity for traditional opioids. This receptor and its endogenous ligand, N/OFQ, are widely distributed in the brain and are implicated in many physiological functions including pain regulation. [(pF)Phe(4),Arg(14),Lys(15)]N/OFQ-NH(2) (UFP-102) is a newly developed peptide agonist of NOP receptors. In this study, we quantitatively investigated the effect of UFP-102 at native NOP receptors of the ventrolateral periaqueductal gray (PAG), a crucial midbrain area involved in pain regulation and enriched with NOP receptors, using blind patch-clamp whole-cell recording technique in rat brain slices. UFP-102, like N/OFQ, induced an outward current in ventrolateral PAG neurons and increased the membrane current elicited by a hyperpolarization ramp from -60 to -140 mV. The current induced by UFP-102 was characterized with inward rectification and had a reversal potential near the equilibrium potential of K(+) ions, indicating that UFP-102 activates G-protein coupled inwardly rectifying K(+) channels. The effect of UFP-102 was concentration-dependent with the maximal effect similar to that of N/OFQ. The EC(50) value was 11+/-2 nM, which is 5 fold lower than that of N/OFQ. The effect of UFP-102 was not affected by naloxone while competitively antagonized by UFP-101 ([Nphe(1),Arg(14),Lys(15)]N/OFQ-NH(2)), a potent NOP receptor antagonist, with a pA(2) value of 6.7. These results suggest that UFP-102 is a full agonist at the postsynaptic NOP receptors of the midbrain of rats and is 5 fold more potent than N/OFQ.

Novel potent agonist [(pF)Phe4,Aib7,Aib11,Arg14,Lys15]N/OFQ-NH2 and antagonist [Nphe1,(pF)Phe4,Aib7,Aib11,Arg14,Lys15]N/OFQ-NH2 of nociceptin/orphanin FQ receptor.[Pubmed:16516988]

Regul Pept. 2006 May 15;134(2-3):75-81.

Two novel ligands for the nociceptin/orphanin FQ (N/OFQ) receptor (NOP), [(pF)Phe4,Aib7, Aib11,Arg14,Lys15]N/OFQ-NH2 (peptide-1) and [Nphe1,(pF)Phe4,Aib7,Aib11,Arg14,Lys15]N/OFQ-NH2 (peptide-2), have been generated by combining different modifications of N/OFQ sequence. In the present study, we investigated the actions of two analogues and compared them with those of N/OFQ in four assays. Peptide-1 mimicked N/OFQ effects in mouse vas deferens and mouse colon and showed similar maximal effects but higher potency relative to N/OFQ. The effects of peptide-1 were sensitive to NOP receptor selective antagonist ([Nphe1]N/OFQ(1-13)-NH2) but not to naloxone in vitro. Peptide-1 (25 pmol, i.c.v.) mimicked the pronociceptive action of N/OFQ (2.5 nmol, i.c.v.) in mouse tail withdrawal assay, displaying higher potency and longer lasting effects. In anesthetized rats, peptide-1 (1 nmol/kg, i.v.) produced a marked decrease in mean arterial pressure, which was comparable to that evoked by i.v. N/OFQ (100 nmol/kg). Peptide-2 did not produce any effect per se but antagonized N/OFQ actions in mouse vas deferens and mouse colon assays. Peptide-2 is active in vivo where it prevented the pronociceptive effect induced by 2.5 nmol N/OFQ i.c.v. in the mouse tail withdrawal assay. Furthermore, peptide-2 at 5 nmol produced alone a robust and long lasting antinociceptive effect. Moreover, peptide-2 (10 and 40 nmol/kg i.v.) didn't produce any effect per se but antagonized hypotensive actions produced by i.v. administration of N/OFQ. Collectively, these findings demonstrate that [(pF)Phe4,Aib7,Aib11, Arg14,Lys15]N/OFQ-NH2 behaves as a highly potent NOP receptor agonist which produces long lasting effects in vivo and [Nphe1,(pF)Phe4,Aib7,Aib11,Arg14,Lys15]N/OFQ-NH2 acts as a pure and competitive antagonist of the NOP receptor.

The effects of [Arg14, Lys15] nociceptin/orphanin FQ, a highly potent agonist of the NOP receptor, on in vitro and in vivo gastrointestinal functions.[Pubmed:16112397]

Peptides. 2005 Sep;26(9):1590-7.

Nociceptin/orphanin FQ (N/OFQ) administered into the lateral left cerebral ventricle of rats has been reported to inhibit in vivo gut motor and secretory functions. Recently, a novel N/OFQ analog, [Arg14, Lys15] N/OFQ, was synthesized and demonstrated to behave as a highly potent agonist at the human recombinant N/OFQ peptide (NOP) receptors and to produce long-lasting effects in vivo in mice compared with the natural ligand N/OFQ. In the present study, the pharmacological profile of [Arg14, Lys15] N/OFQ was further evaluated and compared with that of N/OFQ in vitro on guinea pig exocrine pancreas and in vivo on gastric emptying, colonic propulsion and gastric acid secretion in rats. [Arg14, Lys15] N/OFQ and N/OFQ significantly decreased the KCl-evoked amylase secretion from isolated pancreatic lobules of the guinea pig. In in vivo experiments, [Arg14, Lys15] N/OFQ mimicked the effects of N/OFQ, inducing, after intracerebroventricular injection, a delay (up to 70%) in the gastric emptying of a phenol red meal, an increase (about 40 times) of the mean bead colonic expulsion time and a decrease (up to 90%) of gastric acid secretion in water loaded rats after 90 min pylorus ligature. In all these assays, [Arg14, Lys15] N/OFQ was more effective than N/OFQ, and its effective doses were at least 10-fold lower than N/OFQ effective doses. The highly selective NOP receptor antagonist, UFP-101, decreased the efficacy of [Arg14, Lys15] N/OFQ in in vitro and in vivo assays above reported. These findings: (a) show that pancreatic NOP receptors mediate an in vitro inhibitory effect on stimulated guinea pig amylase secretion; (b) confirm that the stimulation of central NOP receptors exerts an inhibitory control on gastric emptying, colonic motility and gastric secretion in rats and (c) put in evidence that [Arg14, Lys15] N/OFQ, being more potent and effective than the natural ligand N/OFQ, represents a new pharmacological tool for the study of the physiological and pharmacological roles mediated by the N/OFQ-NOP receptor system.

The nociceptin receptor antagonist [Nphe1,Arg14,Lys15]nociceptin/orphanin FQ-NH2 blocks the stimulatory effects of nociceptin/orphanin FQ on the HPA axis in rats.[Pubmed:16784820]

Neuroscience. 2006 Sep 15;141(4):2051-7.

Nociceptin/orphanin FQ (N/OFQ) is an opioid-related peptide that stimulates corticosterone release after i.c.v. administration in non-stressed rats. We employed in situ hybridization histochemistry to investigate N/OFQ-stimulated activation of the HPA axis at the hypothalamic and pituitary level. We have demonstrated that N/OFQ-induced activation of the HPA axis is mediated via the central N/OFQ peptide receptor (NOP) using the recently described selective NOP antagonist [Nphe(1),Arg(14),Lys(15)]nociceptin/orphanin FQ-NH(2) (UFP-101). We found that, at 30 min post-i.c.v. injection, N/OFQ dose-dependently increased plasma adrenocorticotrophin hormone and corticosterone compared with the vehicle-injected controls. N/OFQ (1.0 microg) significantly increased CRF mRNA but not AVP mRNA within the parvocellular hypothalamic paraventricular nucleus compared with the control group, and significantly increased pro-opiomelanocortin (POMC) mRNA in the anterior pituitary. While UFP-101 (1.0 microg) alone had no significant effect on plasma corticosterone concentration it blocked the effect of N/OFQ (1.0 microg) on plasma corticosterone levels when compared with N/OFQ administered alone. UFP-101 also blocked the N/OFQ-induced increase in CRF mRNA and POMC mRNA. These results demonstrate that centrally administered N/OFQ activates the HPA axis via up-regulation of CRF and POMC mRNA and stimulation of corticosterone release in rats. Further, we have demonstrated for the first time that the selective NOP receptor antagonist UFP-101 blocks these effects indicating that N/OFQ-induced HPA axis activation is mediated via central NOP receptors.

Pharmacological profile of nociceptin/orphanin FQ receptors.[Pubmed:11906488]

Clin Exp Pharmacol Physiol. 2002 Mar;29(3):223-8.

1. Nociceptin/orphanin FQ (NC) and its receptor (OP4) represent a novel peptide/receptor system pharmacologically distinct from classical opioid systems. 2. Via OP4 receptor activation, NC regulates several biological functions, both at peripheral and central levels; therefore, the OP4 receptor may be viewed as a novel target for drug development. However, the pharmacology of this receptor is still in its infancy, with few molecules interacting selectively with this receptor. 3. In the present article, we review the findings of studies that have investigated the pharmacological profile of ligands selective for the OP4 receptor, these being two antagonists, the peptide [Nphe1]NC(1-13)NH2 and the non-peptide J-113397, and two agonists, the peptide [Arg14,Lys15]NC, and the non- peptide Ro 64-6198. 4. The results of these studies indicate that agents that selectively activate or block the OP4 receptor may represent new potential drugs for the treatment of human diseases.

[Arg(14),Lys(15)]nociceptin, a highly potent agonist of the nociceptin/orphanin FQ receptor: in vitro and in vivo studies.[Pubmed:11752097]

J Pharmacol Exp Ther. 2002 Jan;300(1):57-63.

The nociceptin (NC)/orphanin FQ analog, [Arg(14),Lys(15)]NC, has been recently demonstrated to behave as a potent agonist at the human recombinant NC receptors (OP(4)). In this study, we evaluated the pharmacological profile of [Arg(14),Lys(15)]NC in vitro on the native OP(4) receptors expressed in isolated tissues and in vivo in the locomotor activity and the tail-withdrawal assays in mice. On isolated tissues, [Arg(14),Lys(15)]NC mimicked the effects of NC, showing similar maximal effects but higher potencies (17-fold in the mouse vas deferens, 10-fold in the rat vas deferens, and about 5-fold in the guinea pig ileum and mouse colon). In these preparations, the effects of [Arg(14),Lys(15)]NC were not modified by 1 microM naloxone, although antagonized by the OP(4) receptor antagonists [Nphe(1)]NC(1-13)NH(2) (pA(2) congruent with 6) and (+/-)trans-1-[1-cyclooctylmethyl-3hydroxymethyl-4-piperidyl]-3-ethyl-1,3-dihydro- 2H-benzimidazol-2-one (J-113397) (pA(2) congruent with 8). In the rat vas deferens, a cocktail of peptidase inhibitors increased the maximal effects of NC, its analog, and the pEC(50) of NC (by 4-fold); the potency of [Arg(14),Lys(15)]NC was not significantly modified by peptidase inhibitors. In in vivo experiments, [Arg(14),Lys(15)]NC mimicked the effects of NC, producing, after intracerebroventricular administration, pronociceptive effects in the tail-withdrawal assay and inhibiting the locomotor activity of the mice. In both assays, [Arg(14),Lys(15)]NC was about 30-fold more potent than NC and produced longer lasting effects. Taken together, the present data demonstrate that [Arg(14),Lys(15)]NC behaves as a highly potent agonist of the OP(4) receptor and is able to produce long-lasting effects in vivo, compared with the natural ligand NC.

Highly potent nociceptin analog containing the Arg-Lys triple repeat.[Pubmed:11097863]

Biochem Biophys Res Commun. 2000 Nov 19;278(2):493-8.

One of the structural characteristics of a neuropeptide nociceptin is the existence of Arg-Lys (RK) residues at positions 8-9 and 12-13; both RKs have been suggested to bind to the acidic amino acid cluster in the second extracellular loop of the seven transmembrane domain receptor ORL1. With a design strategy of attempting to obtain an analog that binds more strongly to the receptor's acidic cluster, we synthesized a series of nociceptin analogs in which the RK dipeptide unit was placed at positions 6-7, 10-11, or 14-15 adjacent to the parent RKs. Among these nociceptin analogs containing the RK triple repeat, [Arg-Lys(6-7)]- and [Arg-Lys(10-11)]nociceptins exhibited weak activities (6-9 and 60-90% of nociceptin, respectively) both in the receptor binding assay and in the [(35)S]GTPgammaS binding functional assay. In contrast, [Arg-Lys(14-15)]nociceptin was found to be very potent in both assays (3-fold in binding and 17-fold in GTPgammaS functional assay). [Arg-Lys(14-15)]nociceptin was the first peptide analog found to be stronger than the parent nociceptin, and structure-activity studies have suggested that the incorporated Arg-Lys(14-15) interacts with either the receptor acidic amino acid cluster or the receptor aromatic amino acid residues.

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