title: In vitro effects of chitosan nanoparticles on proliferation of human gastric carcinoma cell line MGC803 cells.
abstract: OBJECTIVE
  To investigate the effects of chitosan nanoparticles on proliferation of human gastric carcinoma cell line MGC803 in vitro and the possible mechanisms involved.
  
  
  METHODS
  Chitosan nanoparticles were characterized by particle size, zeta potential, and morphology. After treatment with various concentrations of chitosan nanoparticles (25, 50, 75, 100 microg/mL) at various time intervals, cell proliferation, ultrastructural changes, DNA fragmentation, mitochondrial membrane potential (MMP), cell cycle phase distribution and apoptotic peaks of MGC803 cells were analyzed by MTT assay, electron microscopy, DNA agarose gel electrophoresis, and flow cytometry.
  
  
  RESULTS
  Chitosan nanoparticles exhibited a small particle size as 65 nm and a high surface charge as 52 mV. Chitosan nanoparticles markedly inhibited cell proliferation of MGC803 cells with an IC50 value of 5.3 microg/mL 48 h after treatment. After treatment with chitosan nanoparticles, the typical necrotic cell morphology was observed by electron microscopy, a typical DNA degradation associated with necrosis was determined by DNA agarose electrophoresis. Flow cytometry showed the loss of MMP and occurrence of apoptosis in chitosan nanoparticles-treated cells.
  
  
  CONCLUSIONS
  Chitosan nanoparticles effectively inhibit the proliferation of human gastric carcinoma cell line MGC803 in vitro through multiple mechanisms, and may be a beneficial agent against human carcinoma.
authors.affiliation: Nano-biology Laboratory of Animal Science College, Zhejiang University, Hangzhou 310029, Zhejiang Province, China. lifengqi01@hotmail.com
authors.forename: Li-Feng
authors.initials: LF
authors.lastname: Qi
authors.forename: Zi-Rong
authors.initials: ZR
authors.lastname: Xu
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Xia
authors.initials: X
authors.lastname: Jiang
authors.forename: Xin-Yan
authors.initials: XY
authors.lastname: Han
mesh_terms: D002277:Carcinoma / Q000235:genetics / Q000473:pathology* / Q000503:physiopathology; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry* / Q000494:pharmacology*; D053938:DNA Fragmentation / Q000187:drug effects; D006801:Humans; D008564:Membrane Potentials / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects; D049329:Nanostructures; D013274:Stomach Neoplasms / Q000235:genetics / Q000473:pathology* / Q000503:physiopathology
chemical_list: D048271:Chitosan