title: Factors affecting bovine corneal endothelial cell density in vitro.
abstract: OBJECTIVE
  To examine factors influencing the density and contact inhibition of bovine corneal endothelial cells cultured in vitro.
  
  
  METHODS
  Cell counts were performed on bovine corneal endothelial cells cultured for various times in the presence of 10% fetal calf serum, with or without varying concentrations of growth factors, 5% dextran T-500, or 2% chondroitin sulphate, at 32 degrees C or 37 degrees C, and after treatment with beta galactosidase.
  
  
  RESULTS
  Both basic fibroblast growth factor (FGFb) and retinal crude extract (RCE), but neither epidermal growth factor (EGF) nor acidic fibroblast growth factor (FGFa), increased endothelial cell density in vitro (p < 0.05). Continuous exposure to RCE resulted in a higher cell density than did a 24 hour pulse (p < 0.01), and higher cell densities were achieved at 37 degrees C than at 32 degrees C (p < 0.0001). In the absence of RCE, dextran T-500 increased cell density modestly (p < 0.05); in the presence of RCE, the addition of dextran T-500 had no effect on final cell density, whereas chondroitin sulphate significantly decreased final cell density (p < 0.01). In the absence of exogenous growth factors, beta galactosidase treatment resulted in a 50% increase in final cell density compared with controls (p < 0.0001).
  
  
  CONCLUSIONS
  Bovine corneal endothelial cell growth can be augmented under conditions different from those used in corneal preservation systems. The final cell density in a confluent monolayer can be increased by treatment with beta galactosidase, suggesting that corneal endothelial cells may be contact inhibited through a beta galactosidase sensitive receptor system.
authors.affiliation: Department of Ophthalmology, Flinders University of South Australia, Adelaide.
authors.forename: E W
authors.initials: EW
authors.lastname: Johnstone
authors.forename: H C
authors.initials: HC
authors.lastname: Wong
authors.forename: D J
authors.initials: DJ
authors.lastname: Coster
authors.forename: K A
authors.initials: KA
authors.lastname: Williams
mesh_terms: D000818:Animals; D002417:Cattle; D002452:Cell Count / Q000187:drug effects; D002478:Cells, Cultured; D004728:Endothelium, Corneal / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D006133:Growth Substances / Q000494:pharmacology
chemical_list: D006133:Growth Substances