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  • Title: Evidence that morphine and opioid peptides do not share a common pathway with adenosine in inhibiting acetylcholine release from isolated intestine.
    Author: Vizi ES, Somogyi GT, Magyar K.
    Journal: J Auton Pharmacol; 1981 Dec; 1(5):413-9. PubMed ID: 7343558.
    Abstract:
    1 The release of acetylcholine from guinea-pig ileal isolated longitudinal muscle strip with intact Auerbach's plexus was measured by bioassay and by a radioisotope technique. 2 Normorphine (5 x 10(-7)M) and D-Met2, Pro5-enkephalinamide (D-Met, Pro-EA) reduced the release of acetylcholine. Theophylline, an adenosine antagonist, failed to prevent the inhibitory effect of normorphine or D-Met, Pro-EA. 3 Theophylline (1.7 x 10(-4)M) by itself enhanced the twitch responses to field stimulation (0.1 Hz) but did not prevent the inhibitory effect of normorphine and D-Met, Pro-EA. 4 From the results it can be concluded that morphine and opioid peptides do not share a common pathway with adenosine in inhibiting acetylcholine release from axon terminals of Auerbach's plexus.
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