title: Evaluation of cytotoxicity of Moringa oleifera Lam. callus and leaf extracts on Hela cells.
abstract: BACKGROUND
  There are considerable attempts worldwide on herbal and traditional compounds to validate their use as anti-cancer drugs. Plants from Moringaceae family including Moringa oleifera possess several activities such as antitumor effect on tumor cell lines. In this study we sought to determine if callus and leaf extracts of M. oleifera possess any cytotoxicity.
  
  
  METHODS
  Ethanol-water (70-30) extracts of callus and leaf of M. oleifera were prepared by maceration method. The amount of phenolic compounds of the extracts was determined by Folin Ciocalteu method. The cytotoxicity of the extracts against Hela tumor cells was carried out using MTT assay. Briefly, cells were seeded in microplates and different concentrations of the extract were added. Cells were incubated for 48 h and their viability was evaluated by addition of tetrazolium salt solution. After 3 h medium was aspirated, dimethyl sulfoxide was added and absorbance was determined at 540 nm with an ELISA plate reader. Cytotoxicity was considered when more than 50% reduction on cell survival was observed.
  
  
  RESULTS
  Callus and leaf extracts of M. oleifera significantly decreased the viability of Hela cells in a concentration-dependent manner. However, leaf extract of M. oleifera were more potent than that of callus extract.
  
  
  CONCLUSIONS
  As the content of phenolic compounds of leaf extract was higher than that of callus extract, it can be concluded that phenolic compounds are involved in the cytotoxicity of M. oleifera.
authors.affiliation: Department of Pharmaceutical Biotechnology, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Jafarain
authors.affiliation: Department of Pharmacognosy, School of Pharmacy and Pharmaceutical Sciences,Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Asghari
authors.affiliation: Department of Pharmaceutical Biotechnology, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Erfaneh
authors.initials: E
authors.lastname: Ghassami
keywords: Cytotoxicity; Hela; Moringa oleifera