J Herbmed Pharmacol. 2019;8(4):281-286.
doi: 10.15171/jhp.2019.41
  Abstract View: 209
  PDF Download: 212

Original Article

Bronchodilator effect of apigenin and luteolin, two components of Dracocephalum kotschyi on isolated rabbit trachea

Hassan Sadraei 1 * ORCiD, Seyed Mostapha Ghanadian 2, Gholamreza Asghari 2 ORCiD, Aminreza Gavahian 1

1 Department of Pharmacology and Toxicology, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
2 Department of Pharmacognosy and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran

Abstract

Introduction: Dracocephalum kotschyi is a native Iranian plant with antispasmodic activities on smooth muscles such as ileum and uterus. However, so far antispasmodic effect of D. kotschyi on tracheal smooth muscle has not been reported. Therefore, the objective of this research was to investigate antispasmodic activity of D. kotschyi extract and two of its components luteolin and apigenin on rabbit tracheal contraction in vitro.

Methods: Rabbits were euthanized by carbon dioxide and the trachea was dissected and immersed in a Tyrode’s solution. Tracheal rings were prepared and mounted vertically in an organ bath at 37°C and gassed continuously with O2. The tracheal ring preparations were contracted with acetylcholine (ACh) and KCl. The isotonic tension was recorded before and after addition of aminophylline, apigenin, luteolin or flavonoids rich extract of D. kotschyi. Flavonoids rich extract were prepared from D. kotschyi using solvent-solvent fractionation technique.

Results: Standard drug aminophylline, prevented tracheal ring preparation contracted with ACh. Cumulative addition of aminophylline also attenuated tonic contraction induced by KCl on tracheal smooth muscle. D. kotschyi extract at concentration ranges of 32-512 μg/mL in a concentration dependent manner inhibited KCl and ACh induced tracheal contraction. Apigenin and luteolin (range 16–512 μg/mL) relaxed KCl and ACh-induced contraction of tracheal smooth muscle in vitro in a concentration-dependent manner.

Conclusion: This study demonstrated that D. kotschyi extract is a relaxant of tracheal smooth muscle. The relaxant effect of D. kotschyi extract could be due to its flavonoids component such as apigenin and luteolin.

Implication for health policy/practice/research/medical education:

This paper provides pharmacological evidence for bronchodilatory action of apigenin and luteolin two component of Dracocephalum kotschyi. Therefore, they might be useful in bronchospasm conditions such as asthma and chronic bronchitis.

Please cite this paper as: Sadraei H, Ghanadian SM, Asghari G, Gavahian A. Bronchodilator effect of apigenin and luteolin, two components of Dracocephalum kotschyi on isolated rabbit trachea. J Herbmed Pharmacol. 2019;8(4):281-286. doi: 10.15171/ jhp.2019.41.

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Submitted: 27 Jan 2019
Accepted: 17 Feb 2019
First published online: 01 Sep 2019
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