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- W2401205462 abstract "Superfusion techniques were used to examine the effect of acetylcholine (ACh) on the release of norepinephrine (NE) from isolated canine airways. Trachealis strips and helical strips of intrapulmonary airways were incubated with 3H-labeled NE, rinsed, and mounted in superfusion chambers. The superfusate was collected at timed intervals for estimation of total radioactivity and for column chromatographic separation of NE and its metabolites. Field electrical stimulation (2 Hz) and tyramine perfusion (3 X 10(-5) M) increased the total radioactivity of the perfusate by increasing the amount of intact 3H-labeled NE as well as the amounts of all metabolic fractions. Both extraneuronal and neuronal uptake mechanisms were important in inactivating the NE released by either stimulus. Exogenously administered ACh (10(-6)-10(-5) M) inhibited the release of NE that was caused by nerve stimulation but not that caused by tyramine perfusion. The inhibitory effect of ACh was antagonized by atropine (10(-6) M) but not by hexamethonium (5 X 10(-6) M). We conclude that ACh inhibits the exocytotic nerve-stimulated NE release by activating muscarinic receptors on adrenergic nerve varicosities." @default.
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- W2401205462 date "1981-08-01" @default.
- W2401205462 modified "2023-10-16" @default.
- W2401205462 title "Adrenergic neurotransmission in airways: inhibition by acetylcholine" @default.
- W2401205462 doi "https://doi.org/10.1152/jappl.1981.51.2.376" @default.
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