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. 1988 Oct;95(2):413–418. doi: 10.1111/j.1476-5381.1988.tb11661.x

Opioid modulation of non-cholinergic neural bronchoconstriction in guinea-pig in vivo.

M G Belvisi 1, K F Chung 1, D M Jackson 1, P J Barnes 1
PMCID: PMC1854171  PMID: 2465805

Abstract

1. Opioid receptors have been demonstrated on sensory fibres in the vagus nerve. Non-cholinergic (NC) neural bronchoconstriction in guinea-pig is due to release of neuropeptides from sensory nerve endings. We have therefore studied the effect of opioids on this NC bronchoconstriction in the anaesthetized guinea-pig. 2. Bilateral vagal stimulation (5 V, 5 ms, 10 Hz) caused reproducible bronchoconstriction in guinea-pigs which was reduced by atropine (1 mg kg-1), but the NC component was unaffected by hexamethonium (10 mg kg-1). 3. NC bronchoconstriction was reduced by morphine in a dose-dependent manner (ED50 = 132 micrograms kg-1 with a maximal inhibition of 79 +/- 2.1% at 1 mg kg-1). Yohimbine (0.5 mg kg-1) did not alter the inhibitory effect of morphine (1 mg kg-1). 4. The inhibitory effect of morphine was completely reversed by naloxone (1 mg kg-1) which had no effect on NC bronchoconstriction. Propranolol (1 mg kg-1) significantly increased the NC bronchoconstrictor response but did not significantly alter the inhibition by morphine. 5. The selective mu-opioid receptor agonist Tyr-(D-Ala)-Gly-(N-Me-Phe)-Glyol (DAGOL) was significantly more potent than morphine with an ED50 of 5.4 micrograms kg-1 and complete inhibition at 100 micrograms kg-1. The delta-agonist Tyr-(D-Pen)-Gly-Phe-(D-Pen) (DPDPE) was less potent than DAGOL with an ED50 of 28 micrograms kg-1 and a maximal inhibition of only 50 +/- 5% at 100 micrograms kg-1.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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