title: Polydatin, a natural precursor of resveratrol, induces cell cycle arrest and differentiation of human colorectal Caco-2 cell.
abstract: BACKGROUND
  Human colon adenocarcinoma cells are resistant to chemotherapeutic agents, such as anthracyclines, that induce death by increasing the reactive oxygen species. A number of studies have been focused on chemo-preventive use of resveratrol as antioxidant against cardiovascular diseases, aging and cancer. While resveratrol cytotoxic action was due to its pro-oxidant properties. In this study, we investigate whether the Resveratrol (trans-3,5,49-trihydroxystilbene) and its natural precursor Polydatin (resveratrol-3-O-b-mono-D-glucoside, the glycoside form of resveratrol) combination, might have a cooperative antitumor effect on either growing or differentiated human adenocarcinoma colon cancer cells.
  
  
  METHODS
  The polydatin and resveratrol pharmacological interaction was evaluated in vitro on growing and differentiated Caco-2 cell lines by median drug effect analysis calculating a combination index with CalcuSyn software. We have selected a synergistic combination and we have evaluated its effect on the biological and molecular mechanisms of cell death.
  
  
  RESULTS
  Simultaneous exposure to polydatin and resveratrol produced synergistic antiproliferative effects compared with single compound treatment. We demonstrated that polydatin alone or in combination with resveratrol at 3:1 molar ratio synergistically modulated oxidative stress, cell cycle, differentiation and apoptosis. Worthy of note treatment with polydatin induced a nuclear localization and decreased expression of heat shock protein 27, and vimentin redistributed within the cell.
  
  
  CONCLUSIONS
  From morphological, and biochemical outcome we obtained evidences that polydatin induced a transition from a proliferative morphology to cell-specific differentiated structures and caused human CaCo-2 cell death by induction of apoptosis. Our data suggest the potential use of polydatin in combination chemotherapy for human colon cancer.
authors.forename: Salvatore
authors.initials: S
authors.lastname: De Maria
authors.forename: Ilaria
authors.initials: I
authors.lastname: Scognamiglio
authors.forename: Angela
authors.initials: A
authors.lastname: Lombardi
authors.forename: Nicola
authors.initials: N
authors.lastname: Amodio
authors.forename: Michele
authors.initials: M
authors.lastname: Caraglia
authors.forename: Maria
authors.initials: M
authors.lastname: Cartenì
authors.forename: Gianpietro
authors.initials: G
authors.lastname: Ravagnan
authors.affiliation: Department of Biochemistry, Biophisics and General Pathology, Second University of Naples, Naples, Italy. paola.stiuso@unina2.it.
authors.forename: Paola
authors.initials: P
authors.lastname: Stiuso
mesh_terms: D000975:Antioxidants / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D018938:Caco-2 Cells; D002453:Cell Cycle / Q000187:drug effects*; D002454:Cell Differentiation / Q000187:drug effects*; D005434:Flow Cytometry; D005960:Glucosides / Q000494:pharmacology*; D006801:Humans; D018613:Microscopy, Confocal; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D005960:Glucosides; D013267:Stilbenes; D000077185:Resveratrol; C058229:polydatin