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- W2968702472 endingPage "112162" @default.
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- W2968702472 abstract "Lippia alnifolia Mart. & Schauer, known as “alecrim-do-mato”, “alecrim-de-vaqueiro” and “pedrécio”, is used in folk medicine as antiseptic and to treat diseases that affect respiratory system, like bronchitis and asthma. The aim of this work was to investigate the spasmolytic activity and relaxant mechanism of the Lippia alnifolia essential oil (EOLA) on isolated guinea-pig trachea and to correlate with its use in folk medicine. Leaves from L. alnifolia were collected in Pico das Almas, Chapada Diamantina, situated in the city of Rio de Contas, Bahia, Brazil. EOLA was extracted by hydrodistillation, analyzed by GC/FID and GC/MS and the volatile constituents were identified. Spasmolytic activity was assayed in isolated guinea-pig trachea pre-contracted with carbachol 1 μM or histamine 10 μM. Relaxant mechanism of EOLA was determined comparing concentration-response curves in the presence or absence of different blockers. Chemical analysis revealed the presence of carvone (60 ± 0.8%) as major constituent. EOLA (1–243 μg/mL) relaxed isolated guinea-pig trachea pre-contracted with carbachol 1 μM [EC50 = 53.36 (44.75–63.51) μg/mL] or histamine 10 μM [EC50 = 5.42 (4.42–6.65) μg/mL]. The pre-incubation of 4-aminopyridine in histamine-induced contractions did not alter significantly the relaxant effect of EOLA. However, the presence of cesium chloride, glibenclamide, tetraethylammonium, propranolol, indomethacin, dexamethasone, hexamethonium, atropine, L-NAME, methylene blue or ODQ reduced EOLA relaxant effect. EOLA 18 μg/mL pre-incubation in calcium-free medium reduced histamine-evoked contractions, but did not alter histamine contractions in the presence of nifedipine. Lippia alnifolia essential oil has spasmolytic activity on isolated guinea-pig trachea and its mechanism of action possibly involves the activation of multiple signal transduction pathways, which culminate in potassium channels activation and cytosolic calcium reduction." @default.
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- W2968702472 date "2020-01-01" @default.
- W2968702472 modified "2023-10-17" @default.
- W2968702472 title "Lippia alnifolia essential oil induces relaxation on Guinea-pig trachea by multiple pathways" @default.
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- W2968702472 doi "https://doi.org/10.1016/j.jep.2019.112162" @default.
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