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Reactivity of urinary bladder smooth muscle in guinea pigs to acetylcholine and carbachol: participation of acetylcholinesterase
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Reactivity of urinary bladder smooth muscle in guinea pigs to acetylcholine and carbachol: participation of acetylcholinesterase
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Journal Article
Reactivity of urinary bladder smooth muscle in guinea pigs to acetylcholine and carbachol: participation of acetylcholinesterase
2005
Overview
The authors examined the influence of acetylcholinesterase inhibitor (neostigmine) on the in vitro reactivity of urinary bladder smooth muscle (UBSM) in guinea pigs. The aim of the present study was to determine the participation of pharmacokinetic properties of acetylcholine and carbachol in different UBSM reactivity to these mediators. In vitro method of organ baths was used and reactivity of UBSM strips to cumulative doses of acetylcholine and carbachol was tested before and after the incubation with neostigmine (10-4 mol.l-1). Neostigmine caused a significant increase of UBSM reactivity to acetylcholine. The UBSM reactivity to acetylcholine was significantly higher at concentrations of 10-5 and 10-4 mol.l-1 compared to carbachol at the same concentrations. These findings indicate that in addition to different mediator affinity to muscarinic receptors and to their different intrinsic activity, the pharmacokinetic properties of acetylcholine and carbachol also participate in UBSM reactivity.
Publisher
Institute of Physiology
Subject
Acetylcholine - pharmacokinetics
/ Acetylcholine - pharmacology
/ Acetylcholinesterase - metabolism
/ Animals
/ Carbachol - pharmacokinetics
/ Cholinesterase Inhibitors - pharmacology
/ Male
/ Muscle Contraction - drug effects
/ Muscle, Smooth - drug effects
/ Parasympathomimetics - pharmacology
/ Receptors, Muscarinic - drug effects
/ Receptors, Muscarinic - physiology
