title: Polyethyleneterephthalate provides superior retention of endothelial cells during shear stress compared to polytetrafluoroethylene and pericardium.
abstract: BACKGROUND
  Polyethyleneterephthalate (PET) and polytetrafluoroethylene (PTFE) are polymers successfully used as large diameter arterial grafts for peripheral vascular surgery. However, these prosthetic grafts are rarely used for coronary bypass surgery because of their low patency rates. Endothelialisation of the lumenal surface of these materials may improve their patency. This study aimed to compare the endothelialisation of PET, PTFE and pericardium by examining their seeding efficiency over time and the effect of various shear stresses on retention of endothelial cells.
  
  
  METHODS
  Ovine endothelial cells at 4x10(5)cells/cm(2) were seeded onto PET, PTFE and pericardium, and cultured for 1-168 hours. Cell coverage was determined via en face immunocytochemistry and cell retention was quantified after being subjected to shear stresses ranging from 0.018 to 0.037N/m(2) for 15, 30 and 60 minutes.
  
  
  RESULTS
  Endothelial cells adhered to all of the materials one hour post-seeding. PET exhibited better cell retention rate, ranging from 66.9+/-5.6% at 0.018N/m(2) for 15min to 44.7+/-1.9% at 0.037N/m(2) for 60 minutes, when compared to PTFE and pericardium (p<0.0001, three-way ANOVA).
  
  
  CONCLUSIONS
  PET shows superior retention of endothelial cells during shear stress compare to PTFE and pericardium.
authors.affiliation: Biomechanics and Tissue Engineering Group, IRIS, Swinburne University of Technology, 533-545 Burwood Road, Hawthorn, Vic. 3122, Australia. cywong@swin.edu.au
authors.forename: Cynthia S
authors.initials: CS
authors.lastname: Wong
authors.forename: Melissa
authors.initials: M
authors.lastname: Sgarioto
authors.forename: Amal A
authors.initials: AA
authors.lastname: Owida
authors.forename: William
authors.initials: W
authors.lastname: Yang
authors.forename: Franklin L
authors.initials: FL
authors.lastname: Rosenfeldt
authors.forename: Yos S
authors.initials: YS
authors.lastname: Morsi
mesh_terms: D000818:Animals; D001807:Blood Vessel Prosthesis / Q000592:standards*; D002448:Cell Adhesion; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology*; D004730:Endothelium, Vascular / Q000166:cytology; D010496:Pericardium / Q000166:cytology*; D011093:Polyethylene Terephthalates / Q000627:therapeutic use*; D011138:Polytetrafluoroethylene / Q000627:therapeutic use*; D012756:Sheep; D013314:Stress, Mechanical; D014654:Vascular Patency
chemical_list: D011093:Polyethylene Terephthalates; D011138:Polytetrafluoroethylene