| Autor: |
Romulo Sousa Porto, Renalison F. Pereira, A.A.C. Albuquerque, Ariclécio Cunha de Oliveira, Anna P.F.S. Silva, Natália Rocha Celedônio, José Henrique Leal-Cardoso, Taylena M.N. Garcia-Teófilo, Andrelina Noronha Coelho-de-Souza, Leidiane P. Silva, Saad Lahlou, Gloria Pinto Duarte, Pedro Jorge Caldas Magalhães, Valeria Leonhardt |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Fundamental & Clinical Pharmacology. 24:749-758 |
| ISSN: |
0767-3981 |
| Popis: |
This study investigates the effects of essential oil of Pterodon polygalaeflorus (EOPP) and β-caryophyllene (β-CAR). EOPP and β-CAR relaxed the basal tone of ileum smooth muscle in a concentration-dependent manner (IC(50) s = 394.35 ± 62.12 and 68.65 ± 9.51 μg/mL respectively), an effect that was unaltered by hexamethonium, L-nitroarginine methyl ester or indomethacin. Both EOPP and β-CAR evoked a concentration-dependent relaxation of ileum pre-contracted with KCl with an IC(50) value of 107.78 ± 10.47 and 17.35 ± 0.75 μg/mL, respectively. EOPP and β-CAR inhibited the contractions induced by acetylcholine (ACh) and by KCl. In ileal preparations, the CaCl(2) -induced contractions were reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL). Furthermore, CaCl(2) -induced contractions were also reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL) in ileal preparations pretreated with ACh under Ca(2+) -free condition and in the presence of verapamil. EOPP (100 and 300 μg/mL) and β-CAR (30 and 100 μg/mL) reduced the ACh-induced contractions of isolated rat ileum under Ca(2+) -free conditions. In the presence of high KCl and Ca(2+) -free conditions, EOPP (300 μg/mL) and β-CAR (100 μg/mL) reduced the contractions induced by barium. A similar effect was also observed with verapamil. It is concluded that (i) β-CAR is an important constituent involved in the myorelaxant and antispasmodic effects induced by EOPP; (ii) the inhibitory effect on intestinal contractility is myogenic and seems mainly mediated through an intracellular mechanism. However, the ability of EOPP and β-CAR to decrease Ca(2+) influx through cytoplasmic membrane could not be discounted. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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