Abstract
1. Opioids have been shown to inhibit substance P (SP) release from primary afferent neurones (PAN). In addition, opioid receptors have been identified on PAN of the vagus nerves. Sodium cromoglycate (SCG) decreases the excitability of C-fibres in the lung of the dog in vivo. We have utilised a multi-superfusion system to investigate the effect of opioids and SCG on the release of SP from the rat trachea in vitro. 2. Pretreatment of newborn rats with capsaicin (50 mg kg-1 s.c. at day 1 and 2 of life) resulted in a 93.2 +/- 6.3% reduction in tracheal substance P-like immunoreactivity (SP-LI) content when determined by radioimmunoassay in the adult. 3. Exposure to isotonically elevated potassium concentrations (37-90 mM), capsaicin (100 nM-10 microM), and bradykinin (BK; 10nm-1 microM) but not des-Arg9-BK (1 microM) stimulated SP-LI release by a calcium-dependent mechanism. 4. SCG (1 microM and 100 microM) did not affect spontaneous, potassium (60 mM)- or BK (1 microM)-stimulated SP-LI release. 5. Morphine (0.1-100 microM) caused dose-related inhibition of potassium (60 mM)-stimulated SP-LI release with the greatest inhibition of 60.4 +/- 13.7% at 100 microM. The effect of morphine was not mimicked by the kappa-opioid receptor agonist, U50,488H (10 microM) or the delta-opioid receptor agonist, Tyr-(D-Pen)-Gly-Phe-(D-Pen) (DPDPE). 6. The effect of morphine was totally abolished by prior and concomitant exposure to naloxone (100 nM) which had no effect on control release values.(ABSTRACT TRUNCATED AT 250 WORDS)
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