Leonhardt V, Leal-Cardoso JH, Lahlou S, Albuquerque AA, Porto RS, Celedônio NR, Oliveira AC, Pereira RF, Silva LP, Garcia-Teófilo TM, Silva AP, Magalhães PJ, Duarte GP, Coelho-de-Souza AN
Fundamental and Clinical Pharmacology, 2010
ABSTRACT:
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 (IC50s = 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 IC50 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 CaCl2-induced contractions were reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL). Furthermore, CaCl2-induced contractions were also reduced by EOPP (300 μg/mL) and β-CAR (100 μg/mL) in ileal preparations pretreated with ACh under Ca2+-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 Ca2+-free conditions. In the presence of high KCl and Ca2+-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 Ca2+ influx through cytoplasmic membrane could not be discounted.
CITATION:
Leonhardt V, Leal-Cardoso JH, Lahlou S, Et Al. Antispasmodic effects of essential oil of Pterodon polygalaeflorus and its main constituent β-caryophyllene on rat isolated ileum. Fundam Clin Pharmacol. 2010;24(6):749-758.
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