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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-5996
Vol. 11, No. 5, 2012, pp. 777-782
Bioline Code: pr12092
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 11, No. 5, 2012, pp. 777-782

 en Relaxant Activity of the Methanol Extract of Acanthus Montanus check for this species in other resources (Nees) T Anderson (Acanthaceae) on Isolated Guinea Pig Trachea
Adeyemi, OO; Mgbeokwere, UO & Okpo, SO

Abstract

Purpose: To evaluate the effects of the methanol extract of Acanthus montanus check for this species in other resources on guinea pig trachealis muscle.
Methods: Guinea pig tracheae were set up in 10 ml organ baths. The effect of the methanol extract of Acanthus montanus (0.5 - 8 mg/ml) on the spontaneous tone of the trachea and carbacholprecontracted trachea in the absence and presence of propranolol, glibenclamide and procaine was studied.
Results: The extract (0.5 – 8.0 mg/ml) produced a concentration-dependent relaxation of the intrinsic tone in tracheal preparations which was completely blocked by propranolol (3 x 10-7 M), glibenclamide (10-7 M) and procaine (10-3 M). The extract (0.5 - 8 mg/ml) produced a concentration-dependent relaxation of carbachol (10-5M)-precontracted trachea. This effect of the extract was partially blocked by propranolol (3 x 10-7M), procaine (10-3M) and glibenclamide (10-7M) with a progressive increase in the median effective concentration (EC50) values as follows: control, 0.66mg/ml > propranolol, 1.42mg/ml > glibenclamide, 1.54mg/ml > procaine, 2.04 mg/ml.
Conclusion: The results obtained suggest that the extract produces a non-specific smooth muscle relaxant effect mediated via ß-adrenergic receptor mechanism or potassium channels.

Keywords
Acanthus montanus, Trachea, Carbachol, Potassium channels, Propranolol, Glibenclamide, Procaine.

 
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