Browsing by Author "Letelier, Maria Eugenia"

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    Copper modifies liver microsomal UDP-glucuronyltransferase activity through different and opposite mechanisms
    (2007) Letelier, Maria Eugenia; Lagos, Fernando; Faúndez Cáceres, Mario; Miranda, Dante; Montoya, Margarita; Aracena-Parks, Paula; Gonzalez-Lira, Victor
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    Topical anti-inflammatory activity of 2α-hydroxy pentacyclic triterpene acids from the leaves of Ugni molinae
    (2006) Aguirre, Maria C.; Delporte, Carla; Backhouse, Nadine; Erazo, Silvia; Letelier, Maria Eugenia; Cassels, Bruce K.; Silva, Ximena; Alegria, Sergio; Negrete, Rosa
    Leaf extracts of Ugni molinae Turcz. are used in the Chilean cosmetic industry on the assumption that they have decongestant, regenerative, and anti-aging properties. A bioassay-guided fractionation of this plant material showed that some extracts have potent anti-inflammatory activities. Further fractionation led to the isolation and identification of betulinic acid, a mixture of ursolic and oleanolic acids, and the 2 alpha-hydroxy derivatives alphitolic, asiatic, and corosolic acids. The latter three were evaluated in vivo in the mouse ear assay for their topical anti-inflammatory activity, inducing inflammation with either arachidonic acid (AA) or 12-O-tetradecanoylphorbol-13 acetate (TPA). Only corosolic acid was active in the AA assay, with similar potency to nimesulide, but all three triterpene acids inhibited TPA-induced inflammation with potencies comparable to that of indomethacin. (c) 2006 Elsevier Ltd. All rights reserved.