tailieunhanh - Báo cáo y học: "Anti-inflammatory effects and possible mechanism of action of lupeol acetate isolated from Himatanthus drasticus (Mart.) Plumel"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Anti-inflammatory effects and possible mechanism of action of lupeol acetate isolated from Himatanthus drasticus (Mart.) Plumel. | Lucetti et al. Journal of Inflammation 2010 7 60 http content 7 1 60 JOURNAL OF INFLAMMATION RESEARCH Open Access Anti-inflammatory effects and possible mechanism of action of lupeol acetate isolated from Himatanthus drasticus Mart. Plumel Daniel L Lucetti1 Elaine CP Lucetti1 Mary Anne M Bandeira2 Helenicy NH Veras2 Aline H Silva2 2 2 . z-z- A I 2 2 3 14 Luzia Kalyne AM Leal2 Amanda A Lopes2 Victor CC Alves2 Gabriela S Silva2 Gerly Anne Brito3 Glauce B Viana1 4 Abstract Background The species Himatanthus drasticus is popularly known in Northeast Brazil as janaguba and belongs to the family Apocynaceae. The latex collected from its stem bark is used for several purposes including antiinflammatory properties and presents among its bioactive constituents the pentacyclic triterpene lupeol. The objective of the present work was to study in vivo and in vitro the lupeol acetate LA isolated from the plant latex in several models of inflammation. Methods Male Swiss mice 25-30 g 6-24 animals per group were administered with LA 30 min before the test initiation. In the evaluation of analgesic activity the formalin test was used. The anti-inflammatory activity was evaluated by the following tests paw edema induced by carrageenan and dextran and the carrageenan-induced neutrophil migration into peritoneal cavities. Furthermore the effect of LA on the myeloperoxidase release MPO an inflammation biomarker from human neutrophils was also determined as well as its antioxidant potential by the DPPH assay. Results In the formalin test LA 10 25 and 50 mg kg . inhibited both the 1st neurogenic 0-5 min and mainly the 2nd inflammatory 20-25 min phase. Naloxone completely reversed the LA effect indicating the participation of the opioid system. LA also significantly inhibited carrageenan- and dextran-induced paw edemas as well as the neutrophil migration to the peritoneal cavity evaluated by the carrageenan-induced pleurisia. In this model the effect of a .

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