ISSN:
1432-1041
Keywords:
Key words Tiquizium bromide
;
Muscarinic receptor subtype
;
Chronic obstructive pulmonary disease; airway smooth muscle
;
antimuscarinic agent
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract Objective: We studied the bronchodilatory effect of tiquizium bromide [3-(di-2-thienylmethylene)-5-methyl-trans-quinolizidinium bromide; TQZ], an antimuscarinic agent, on airway smooth muscle in vitro, and also in patients with chronic obstructive pulmonary disease (COPD). Methods: In the first experiment, canine tracheal smooth muscle was used to measure the pA2 of TQZ in vitro. The selectivity of TQZ for muscarinic receptor subtypes was also examined with a radioligand binding assay. Results: The pA2 value of TQZ was 8.75. The pK i values of TQZ for M1, M2, and M3 were 8.70, 8.94, and 9.11, respectively. In an open pilot experiment, the effects of TQZ inhalation were studied in seven patients with COPD (seven men, mean age 68.5 years). TQZ significantly increased forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV1) in a dose-dependent manner. The mean maximum increases in FVC and FEV1 caused by inhaled TQZ (2.0 mg) were 24% and 29%, respectively, and they were measured 1 h after the drug had been inhaled. The FVC and FEV1 were still significantly higher than the control values even 8 h after the drug had been inhaled. No adverse effects were observed after inhalation of TQZ. Conclusion: These data suggest that TQZ is an effective antimuscarinic agent, and that it causes significant bronchodilation in patients with COPD.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002280050126
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