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Title: [Dmt(1) ]N/OFQ(1-13)-NH(2) , a potent nociceptin/orphanin FQ and opioid receptor universal agonist.
Authors: Molinari, S
Camarda, V
Rizzi, A
Marzola, G
Salvadori, S
Marzola, E
Molinari, P
McDonald, J
Ko, MC
Lambert, DG
Calo', G
Guerrini, R
First Published: 24-Jul-2012
Citation: BR J PHARMACOL, 2012
Abstract: Background and purpose.  Intrathecally (i.t.) administered nociceptin/orphanin FQ (N/OFQ) evokes antinociceptive effects in rodents. Recent studies in monkeys demonstrated that i.t. coapplication of N/OFQ and morphine elicits synergistic antinociceptive actions suggesting mixed N/OFQ peptide (NOP) and mu opioid (MOP) receptor agonists as innovative spinal analgesics. Thus novel N/OFQ related peptides were synthesised in order to identify and pharmacologically characterize a mixed NOP/MOP agonist. Experimental approach.  The following in vitro assays were used: calcium mobilization in cells expressing the human NOP or classical opioid receptors and chimeric G proteins, receptor and [(35) S]GTPγS binding, [(35) S]GTPγS binding in rat spinal cord membranes, guinea pig ileum bioassay. In vivo experiments were performed in monkeys using the tail withdrawal assay. Key results.  From calcium mobilization studies [Dmt(1) ]N/OFQ(1-13)-NH(2) was selected as the most potent and least selective compound. The mixed NOP/opioid full agonist activity and high affinity of [Dmt(1) ]N/OFQ(1-13)-NH(2) was confirmed at human recombinant receptors in receptor binding, calcium mobilization and/or [(35) S]GTPγS binding studies, at rat spinal cord receptors in [(35) S]GTPγS binding experiments, and at guinea pig receptors inhibiting neurogenic contractions in the ileum. In vivo in the tail withdrawal assay in monkeys i.t. [Dmt(1) ]N/OFQ(1-13)-NH(2) was able to elicit robust and long lasting antinociceptive effects. Conclusions and Implications.  Collectively these results demonstrate that [Dmt(1) ]N/OFQ(1-13)-NH(2) behaves as NOP/opioid receptor universal agonist and substantiate the suggestion that such mixed ligands are worthy of development as innovative spinal analgesics. © 2012 The Authors. British Journal of Pharmacology © 2012 The British Pharmacological Society.
DOI Link: 10.1111/j.1476-5381.2012.02115.x
eISSN: 1476-5381
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Cardiovascular Sciences

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