Stimulation of Sensory Neuropeptide Release by Nociceptin/orphanin FQ Leads to Hyperaemia in Acutely Inflamed Rat Knees

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2006 Jun 20

PMID 16783411

Citations 8

Authors

Chunfen Zhang

Jason J McDougall

Affiliations

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Abstract

The peripheral effect of the 'opioid-like' peptide nociceptin/orphanin FQ (N/OFQ) on joint blood flow was investigated in acutely inflamed rats. Sensory neuropeptide release from capsaicin-sensitive nerves and the involvement of synovial mast cells and leukocytes on these vasomotor responses were also studied. Blood flow measurements of exposed knee joints were performed in urethane-anaesthetised rats (2 mg kg(-1) intraperitoneal) using laser Doppler perfusion imaging. Topical administration of N/OFQ (10(-13)-10(-8) mol) to acutely inflamed joints caused a dose-dependent increase in synovial perfusion with an ED(50) of 4.0 x 10(-10) mol. This vasodilatatory response was blocked by the selective NOP receptor antagonist [Phe(1)-(CH(2)-NH)-Gly(2)]-Nociceptin(1-13)-NH(2) (10(-9) mol) (P<0.0001).Co-administration of N/OFQ with the neurokinin-1 (NK(1)) receptor antagonist [D-Arg1,D-Phe5,D-Trp7,9,Leu11]-Substance P (10(-12) mol), the vasoactive intestinal peptide (VIP) receptor antagonist VIP(6-28) (10(-9) mol) or the calcitonin gene-related peptide (CGRP) receptor antagonist CGRP(8-37) (10(-9) mol) all blocked the hyperaemic effect of N/OFQ (P<0.0001). Treatment of acutely inflamed knees with capsaicin (8-methyl-N-vanillyl-6-noneamide) to destroy unmyelinated joint afferents also inhibited N/OFQ vasomotor activity. Stabilisation of synovial mast cells with disodium cromoglycate (cromolyn) ameliorated N/OFQ responses, whereas inactivation of circulating leukocytes with the pan-selectin inhibitor fucoidin completely blocked N/OFQ-induced hyperaemia in these joints. These experiments show that in acutely inflamed knee joints, N/OFQ acts on NOP receptors located on synovial mast cells and leukocytes leading to the secondary release of proinflammatory mediators into the joint. These agents subsequently stimulate sensory neuropeptide release from capsaicin-sensitive nerves culminating in vasodilatation and increased articular blood flow.

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