title: Biodegradable porous calcium polyphosphate scaffolds for the three-dimensional culture of dental pulp cells.
abstract: OBJECTIVE
  To develop a three-dimensional culture model of human dental pulp cells (DPCs) with biodegradable porous calcium polyphosphate (CPP) scaffolds.
  
  
  METHODS
  Human DPCs were isolated from three donors. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay was used to evaluate the cytotoxicity of CPP compared with hydroxyapatite (HA) and beta-tricalcium phosphate (beta-TCP). Values were analysed using unpaired t-tests. Cells were seeded onto porous CPP scaffolds with pore sizes in the range of 200-300 microm. The nature of cellular adaptation in the three-dimensional culture model was then evaluated visually by scanning electronic microscopy (SEM) and confocal laser scanning microscopy (CLSM). The apoptotic property of cells on the scaffolds was also assessed by DNA staining with CLSM.
  
  
  RESULTS
  The cytotoxicity assay indicated that there was no significant difference between CPP and HA for each donor's original cells (P>0.05). Calcium polyphosphate had no cytotoxic effect on DPCs, whilst SEMs showed that cells successfully adhered to CPP scaffolds and spread amongst pores. On the cell surface, fine processes and matrix secretory granules were found. Confocal laser scanning microscopy showed that cells took on a three-dimensional structure with signs of vitality.
  
  
  CONCLUSIONS
  Porous CPP scaffolds are promising for the establishment of a three-dimensional culture model of DPCs.
authors: Key Laboratory of Oral Biomedical Engineering, Ministry of Education, Shichuan University, Chengdu, China.
authors: F-M
authors: FM
authors: Wang
authors: K
authors: K
authors: Qiu
authors: T
authors: T
authors: Hu
authors: C-X
authors: CX
authors: Wan
authors: X-D
authors: XD
authors: Zhou
authors: J L
authors: JL
authors: Gutmann