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Bronchodilator activity of Mikania glomerata Sprengel on human bronchi and guinea-pig trachea
- Source :
- Journal of Pharmacy and Pharmacology. 54:249-256
- Publication Year :
- 2002
- Publisher :
- Oxford University Press (OUP), 2002.
-
Abstract
- The effects of aqueous extracts and hydro-alcoholic extract (HAE), and of a dichloromethane fraction (MG1) obtained from the HAE of Mikania glomerata leaves on isolated respiratory and vascularsmooth muscle have been investigated. Aqueousextracts and HAE induced a significant inhibition on the histamine contractions on the isolated guinea-pig trachea. HAE extract induced a concentration-dependent relaxation on guinea-pig trachea pre-contracted with histamine (IC50 0.34 (0.29-0.39) mg mL−1), acetylcholine (IC50 0.72 (0.67-0.77) mg ml−1) or K+ (IC50 1.41 (1.18-1.64) mg mL−1) and on isolated human bronchi precontracted with K+ (IC50 0.34 (0.26-0.42) mg mL−1). The dichloromethane fraction induced a concentration dependent relaxation in guinea-pig trachea precontracted with K+ (IC50 0.017 (0.012-0.022) mg mL−1). The dichloromethane fraction had also a small vasodilator effect on the isolated mesenteric vascular bed and on the isolated rat aorta, and a significant reduction of the oedema induced by subplantar injections of Bothrops jararaca venom in mice. When tested on plasmid DNA, MG1 did not damage the DNA. Chromatographic analysis showed the presence of 11.4% w/w coumarin in MG1. The results supported the indication of M. glomerata products for the treatment of respiratory diseases where bronchoconstriction is present.
- Subjects :
- Male
Vascular smooth muscle
medicine.drug_class
Muscle Relaxation
Guinea Pigs
Pharmaceutical Science
Aorta, Thoracic
Bronchi
Asteraceae
In Vitro Techniques
Pharmacology
Bronchoconstrictor Agents
Guinea pig
chemistry.chemical_compound
Bronchodilator
Animals
Humans
Medicine
Rats, Wistar
Respiratory system
Bronchus
Plant Extracts
business.industry
Muscle, Smooth
Bronchodilator Agents
Mesenteric Arteries
Rats
Plant Leaves
Trachea
Vasodilation
medicine.anatomical_structure
chemistry
Anesthesia
Bronchoconstriction
medicine.symptom
business
Histamine
Respiratory tract
Subjects
Details
- ISSN :
- 20427158 and 00223573
- Volume :
- 54
- Database :
- OpenAIRE
- Journal :
- Journal of Pharmacy and Pharmacology
- Accession number :
- edsair.doi.dedup.....892ebab8a5ef8bc15fc52d24880c01e4