Antispasmodic effects of essential oil of Pterodon polygalaeflorus and its main constituent β-caryophyllene on rat isolated ileum

Valeria Leonhardt, José H. Leal-Cardoso, Saad Lahlou, Aline A.C. Albuquerque, Romulo S. Porto, Natalia R. Celedônio, Ariclecio C. Oliveira, Renalison F. Pereira, Leidiane P. Silva, Taylena M.N. Garcia-Teófilo, Anna P.F.S. Silva, Pedro J.C. Magalhães, Gloria P. Duarte, Andrelina N. Coelho-De-Souza

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44 Scopus citations

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.

Original languageEnglish
Pages (from-to)749-758
Number of pages10
JournalFundamental and Clinical Pharmacology
Volume24
Issue number6
DOIs
StatePublished - Dec 2010

Keywords

  • β-caryophyllene
  • Antispasmodic effect
  • Essential oil
  • Ileal smooth muscle
  • Pterodon polygalaeflorus

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