Effects of amitriptyline, a tricyclic antidepressant, on smooth muscle reactivity of isolated rat trachea
نویسندگان
چکیده
Purpose. This study was designed to investigate the action of amitriptyline, a tricyclic antidepressant, on airway smooth muscle reactivity and its underlying mechanisms. Methods. In isolated rat trachea, isometric force was recorded to examine the effects of amitriptyline on contractile response to acetylcholine (ACh), electrical field stimulation (EFS), calyculin A (myosin light chain phosphatase inhibitor) and sphingosylphosphorylcholine (Rho-kinase activator, SPC). In addition, inositol monophosphate (IP1) accumulation was measured to examine its effects on inositol 1,4,5-trisphosphate (IP3) production during stimulation with ACh. Results. Amitriptyline inhibited contractile responses to ACh, EFS, calyculin A, and SPC with IC50 values (mean SD) of 4.3 1.3 M, 3.2 1.6 M, 256.4 106.4 M, and 98.2 21.8 M, respectively. In addition, amitriptyline (10 M) eliminated the ACh (10 M)-induced IP1 accumulation.
منابع مشابه
Comparative Study of Protective Effects of Salbutamol and Beclomethasone against Insulin Induced Airway Hyper-reactivity on Isolated Tracheal Smooth Muscle of Guinea Pig
Inhalational insulin was withdrawn from the market due to its potential to produce airway hyper-reactivity and bronchoconstriction. So the present study was designed to explore the acute effects of insulin on airway reactivity of guinea pigs and protective effects of salbutamol and beclomethasone against insulin induced airway hyper-responsiveness on isolated tracheal smooth muscle of guinea pi...
متن کاملComparative Study of Protective Effects of Salbutamol and Beclomethasone against Insulin Induced Airway Hyper-reactivity on Isolated Tracheal Smooth Muscle of Guinea Pig
Inhalational insulin was withdrawn from the market due to its potential to produce airway hyper-reactivity and bronchoconstriction. So the present study was designed to explore the acute effects of insulin on airway reactivity of guinea pigs and protective effects of salbutamol and beclomethasone against insulin induced airway hyper-responsiveness on isolated tracheal smooth muscle of guinea pi...
متن کاملContribution of potassium channels, beta2-adrenergic and histamine H1 receptors in the relaxant effect of baicalein on rat tracheal smooth muscle
Objective(s): Baicalein, a compound extracted from a variety of herbs, showed various pharmacological effects. This study evaluated the relaxant effects of baicalein and its underlying molecular mechanisms of action on rat’s isolated tracheal smooth muscle.Materials and Methods: Tracheal smooth muscle were contracted by 10 μM methacholin...
متن کاملPreventive effects of ipratropium and salbutamol against insulin induced tracheal smooth muscle contraction in guinea pig model
Inhalational insulin was withdrawn from the market due to its potential to produce airway hyper-reactivity and bronchoconstriction. So the present study was designed to explore the acute effects of insulin on airway reactivity of guinea pigs and protective effects of salbutamol and ipratropium against insulin induced airway hyper-responsiveness on isolated tracheal smooth muscle of guinea pig. ...
متن کاملThe Relaxant Effect of Crocin on Rat Tracheal Smooth Muscle and Its Possible Mechanisms
Crocin, a component of saffron, showed hypotensive which is perhaps due to vascular smooth muscle relaxant effect. The relaxant effects of saffron on tracheal smooth muscle also could be due to its constituent, crocin. In the present study, the relaxant effects of crocin and its possible mechanisms on rat tracheal smooth muscle were investigated. The relaxant effects of three cumulative concent...
متن کامل