title: Cytotoxicity screening of endemic plants from Guayana highlands.
abstract: A chemical-ecology approach has been used to screen plants growing in Guyana Highlands as an indicator of production of biologically active secondary metabolites. Extracts of leaves from 19 species, most of them endemic in this area, and collected at the top of Roraima Tepui (2,723 m) were screened in vitro at different concentrations for their potential cytotoxic activity against three tumour cell lines: HT29 (colon), A549 (lung) and MDA-MB-231 (breast). MTT (tetrazolium blue) colorimetric assay was employed as cytotoxicity test. Extracts of nine species caused less than 30% growth in at least one cell line. From these species, high cytotoxic activity was detected in Casearia sylvestris var. lingua and Ledotamnus sessiliflorus extracts; medium activity was found in Cyathea sp. Two other species, Cyrilla racemiflora and Heliamphora minor showed lower but significant cytotoxicity. Further cytotoxicity-directed fractionation of these extracts would be advisable to isolate and identify the active principles of these plants.
authors.affiliation: Madrid Área de Tecnología de Alimentos, Universidad de Almería, 04120 Almería, Spain. jlguil@ual.es
authors.forename: José  Luis
authors.initials: J
authors.lastname: Guil-Guerrero
authors.forename: Pablo
authors.initials: P
authors.lastname: Campra
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000188:drug therapy; D037821:Casearia; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D003110:Colonic Neoplasms / Q000188:drug therapy; D004354:Drug Screening Assays, Antitumor; D029791:Ericaceae; D005260:Female; D006172:Guyana; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts