title: 'In vivo' and 'in vitro' activity of Larrea divaricata Cav. on EL-4 cells.
abstract: Larrea divaricata is a plant widely used in folk medicine in Argentina. It has been demonstrated that an aqueous extract of L. divaricata possesses a biphasic effect on cell proliferation, at low concentrations exerts a stimulatory action and at high concentrations exerts anti-proliferative effects upon the T lymphoma BW 5147; therefore, we propose in this paper to test the effect of the extract 'in vitro' and 'in vivo' in another T-cell lymphoma named EL-4. It was analyzed 'in vitro' cell proliferation by tritiated thymidine uptake and the effect of the extract on tumors induced in mice analyzing tumor progression and survival.The results showed that the aqueous extract induced the proliferation of tumor cells at all the concentrations studied. The results 'in vivo' showed that the aqueous extract stimulated significantly the size of tumors and that untreated mice lived longer than those treated. It is important to be very careful when plant extracts are selected for the treatment of several diseases. Consequently, before using a plant extract, specific scientific studies must be undertaken on different models to certificate therapeutic and adverse effects. Moreover, it can be said that L. divaricata has a specific anti-tumor mechanism of action depending on the targets.
authors.affiliation: Institute of Chemical and Metabolism of Drugs, University of Buenos Aires, National Council of Scientific and Technical Research (QUIMEFA-UBA-CONICET), Buenos Aires, Argentina.
authors.forename: Roberto
authors.initials: R
authors.lastname: Davicino
authors.forename: Rosario
authors.initials: R
authors.lastname: Alonso
authors.forename: Claudia
authors.initials: C
authors.lastname: Anesini
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology* / Q000627:therapeutic use; D001118:Argentina; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D002851:Chromatography, High Pressure Liquid; D003627:Data Interpretation, Statistical; D004305:Dose-Response Relationship, Drug; D005260:Female; D032442:Larrea / Q000737:chemistry*; D008519:Medicine, Traditional; D051379:Mice; D008810:Mice, Inbred C57BL; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology* / Q000627:therapeutic use; D016019:Survival Analysis; D016896:Treatment Outcome; D023041:Xenograft Model Antitumor Assays
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts