In vitro and in vivo antitumor effects of the flavonol glycosides isolated of Herissantia crispa (L.) Brizicky

This paper describes the cytotoxic and antitumoral activities of kaempferol 3-O-(6”-O-E-pcoumaroyl)-β-D-glucopyranoside (tiliroside), kaempferol 3,7-di-O-α-L-rhamnoside (dhiramnoside) and of the mixture of sitosteryl-3-O-β-D-glucopyranoside and stigmasteryl-3-O-β-D-glucopyranoside (GM) isolated of the Herissantia crispa. The compounds did not present cytotoxic activity against NCI-H292, HEp-2 and KB cells. In vivo, dhiramnoside did not present significant inhibitory activity of the growth of sarcoma 180 when compared with the control group; however, tiliroside and GM-treated animals showed a high inhibition rate in the growth of the tumor. Tiliroside inhibits significantly the growth of the carcinoma of Ehrlich. In conclusion, tiliroside exhibited promising antitumor effects without an expressive toxicity.Colegio de Farmacéuticos de la Provincia de Buenos Aire

Chemical constituents from Sidastrum paniculatum and evaluation of their leishmanicidal activity

AbstractSidastrum paniculatum (L.) Fryxell, Malvaceae, is popularly known in Brazil as “malva-roxa” or “malvavisco”. The species is found mainly in Northeast region where it is used by locals to treat spider bites and bee stings. Aiming to identify the chemical compounds from S. paniculatum secondary metabolism and to contribute to the chemotaxonomic knowledge of Malvaceae family, a phytochemical study of S. paniculatum was carried out. Besides that, the isolated compounds were evaluated for antileishmanial activity against promastigotes of Leishmania braziliensis. By using chromatographic techniques the study resulted the isolation of eight compounds: 3-oxo-21β-H-hop-22(29)-ene; sebiferic acid; sitosterol 3-O-β-d-glucopyranoside/stigmasterol 3-O-β-d-glucopyranoside; phaeophytin a; 132(S)-hydroxyphaeophytin a; 132(S)-hydroxy-(173)-ethoxyphaeophorbide a and 7,4′-di-O-methylisoescutellarein. The structure of all isolated compounds was elucidated by spectroscopic analysis, including two-dimensional NMR techniques. In addition, the isolated compounds phaeophytin a; 132(S)-hydroxyphaeophytin a; 132(S)-hydroxy-(173)-ethoxyphaeophorbide a and 7,4′-di-O-methylisoescutellarein exhibited antileishmanial activity against promastigotes of L. braziliensis