J Herbmed Pharmacol. 2020;9(2): 145-152.
doi: 10.34172/jhp.2020.19
  Abstract View: 112

Original Article

Antispasmodic effect of hydroalcoholic and flavonoids extracts of Dracocephalum kotschyi on rabbit bladder.

Hassan Sadraei 1 * ORCID logo, Seyed Ebrahim Sajjadi 2 ORCID logo, Arefe Tarafdar 1

1 Department of Pharmacology and Toxicology, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
2 Department of Pharmacognosy and, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran


Introduction: Dracocephalum kotschyi extract has antispasmodic activities on smooth muscle including ileum, uterus, and trachea. The objective of this research was to investigate the antispasmodic activity of hydroalcoholic and flavonoids extracts of D. kotschyi on rabbit bladder contractions. Methods: Rabbits were euthanized by carbon dioxide asphyxiation and the whole bladder was dissected out and immersed in the Tyrode’s solution. Longitudinal bladder strips were mounted vertically in an organ bath at 37°C and gassed continuously with O2. Bladder strips were contracted with acetylcholine (ACh), KCl, or electrical field stimulation (EFS). Isotonic tension of the tissue was recorded before and after the addition of hydroalcoholic or flavonoids rich extracts of D. kotschyi. Nifedipine and propantheline were used as standard drugs. Results: Standard drug propantheline, prevented bladder phasic contraction induced by ACh (1μM) without affecting KCl response. On the other hand, the cumulative addition of nifedipine attenuated the tonic contractions induced by KCl (20mM) on bladder smooth muscle. Hydroalcoholic and flavonoids extracts of D. kotschyi at concentration ranges of 10-320 μg/mL in a concentration dependent way inhibited bladder tonic contraction induced by KCl (n=6). Both extracts also in a concentration-dependent manner relaxed EFS and ACh-induced contractions (range, 20–1280 μg/mL) of bladder smooth muscle in vitro. Complete inhibition was achieved with the highest used concentrations of the extracts. The inhibitory effect of the extract was reversible following washing the tissues with fresh Tyrode’s solution. Conclusion: This study clearly demonstrated that D. kotschyi extracts were able to prevent contractions induced by ACh, KCl or EFS in isolated rabbit bladder. This means that people consuming this medicinal plant may face urinary retention which could be a problem for patients with prostate hypertrophy. On the other hand, this plant might be useful in patients with urinary incontinence. However, its usefulness must be assessed in the controlled clinical trials.
Keywords: Acetylcholine, Bladder, Dracocephalum kotschyi, Electrical field stimulation, Smooth muscle
This paper provides pharmacological evidence for spasmolytic action of Dracocephalum kotschyi on the isolated bladder and therefore it might be useful for the treatment of bladder incontinence.
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Abstract View: 112

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Submitted: 25 Aug 2019
Accepted: 01 Dec 2019
ePublished: 14 Feb 2020
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