Mechanisms of relaxant action of 3-O-methylquercetin in isolated guinea pig trachea

Wun Chang Ko, Han Lang Wang, Chien Bang Lei, Chih Hsien Shih, Mei Ing Chung, Chung Nan Lin

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We investigated the mechanisms of action of 3-O-methylquercetin (3-MQ), isolated from Rhamnus nakaharai (Hayata) Hayata (Rhamnaceae) which is used as a folk medicine for treating constipation, inflammation, tumors and asthma in Taiwan. The tension changes of tracheal segments were isometrically recorded on a polygraph. 3-MQ concentration-dependently relaxed histamine (30 μM)-, carbachol (0.2 μM)- and KCI (30 mM)-induced precontractions, and inhibited cumulative histamine-, and carbachol-induced contractions in a non-competitive manner. 3-MQ also concentration-dependently and non-competitively inhibited cumulative Ca2+-induced contractions in depolarized (K+, 60 mM) guinea-pig trachealis, The nifedipine (10 μM)-remaining tension of histamine (30 μM)-induced precontraction was further relaxed by 3-MQ suggesting that no matter whether VDCCs were blocked or not, 3-MQ may have other mechanisms of relaxant action. The relaxant effect of 3-MQ was unaffected by the removal of epithelium or by the presence of propranolol (1 μM), 2′,5′-dideoxyadenosine (10 μM), methylene blue (25 μM), glibenclamide (10 μM), Nω-nitro-L-arginine (20 μM), or α-chymotrypsin (1 U/ml). However, 3-MQ (7.5-15 μM) and IBMX (3-6 μM), a positive control, produced parallel and leftward shifts of the concentration-response curve of forskoline (0.01-3 μM) or nitroprusside (0.01-30 μM). 3-MQ or IBMX at various concentrations (10-300 μM) concentration-dependently and significantly inhibited cAMP- and cGMP-PDE activities of the trachealis. The IC50 values of 3-MQ were estimated to be 13.8 and 14.3 μM, respectively. The inhibitory effects of 3-MQ on both enzyme activities were not significantly different from those of IBMX, a non-selective PDE inhibitor. The above results reveal that the mechanisms of relaxant action of 3-MQ may be due to its inhibitory effects on both PDE activities and its subsequent reducing effect on [Ca2+]i of the trachealis.

Original languageEnglish
Pages (from-to)30-35
Number of pages6
JournalPlanta Medica
Volume68
Issue number1
DOIs
Publication statusPublished - 2002

Fingerprint

trachea (vertebrates)
histamine
Trachea
guinea pigs
carbachol
Guinea Pigs
Rhamnus
glibenclamide
Rhamnaceae
calcium
constipation
propranolol
methylene blue
asthma
chymotrypsin
1-Methyl-3-isobutylxanthine
traditional medicine
arginine
inhibitory concentration 50
Taiwan

Keywords

  • 3-O-Methylquercetin
  • Guinea-pig trachea
  • Intracellular calcium
  • Phosphodiesterase
  • Rhamnaceae
  • Rhamnus nakaharai

ASJC Scopus subject areas

  • Plant Science
  • Drug Discovery
  • Organic Chemistry
  • Pharmacology

Cite this

Ko, W. C., Wang, H. L., Lei, C. B., Shih, C. H., Chung, M. I., & Lin, C. N. (2002). Mechanisms of relaxant action of 3-O-methylquercetin in isolated guinea pig trachea. Planta Medica, 68(1), 30-35. https://doi.org/10.1055/s-2002-20059

Mechanisms of relaxant action of 3-O-methylquercetin in isolated guinea pig trachea. / Ko, Wun Chang; Wang, Han Lang; Lei, Chien Bang; Shih, Chih Hsien; Chung, Mei Ing; Lin, Chung Nan.

In: Planta Medica, Vol. 68, No. 1, 2002, p. 30-35.

Research output: Contribution to journalArticle

Ko, WC, Wang, HL, Lei, CB, Shih, CH, Chung, MI & Lin, CN 2002, 'Mechanisms of relaxant action of 3-O-methylquercetin in isolated guinea pig trachea', Planta Medica, vol. 68, no. 1, pp. 30-35. https://doi.org/10.1055/s-2002-20059
Ko, Wun Chang ; Wang, Han Lang ; Lei, Chien Bang ; Shih, Chih Hsien ; Chung, Mei Ing ; Lin, Chung Nan. / Mechanisms of relaxant action of 3-O-methylquercetin in isolated guinea pig trachea. In: Planta Medica. 2002 ; Vol. 68, No. 1. pp. 30-35.
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