title: Effect of He-Ne laser (632.8 nm) and Polygen on CHO cells.
abstract: OBJECTIVE
  We determined the effect of He-Ne laser biostimulation in combination with Polygen (PG) on Chinese hamster ovary (CHO) cells.
  
  
  BACKGROUND
  Several studies have shown that He-Ne laser (632.8 nm), growth factors, and growth hormone can enhance cellular proliferation and that the use of low-level laser stimulation combined with growth factor stimulation has scientific support. PG, an animal protein extract containing a blend of growth factors and growth hormone, was used together with a He-Ne laser to determine their efficacy in the enhancement of cellular proliferation.
  
  
  METHODS
  The dose-response curves for the colony-forming ability of CHO cells in 5% FCS-MEM with 6-125 microg/ml PG and He-Ne laser with an optimum power density of 1.25 mW/cm2 and cumulative doses of 60-600 mJ/cm2 was given for 3 consecutive days. The combined effects of He-Ne laser 180 mJ/cm2 with 6 and 12 microg/ml PG were determined. Quadruplicate cultures were performed. The student's t-test was used to ascertain differences of treated groups from controls.
  
  
  RESULTS
  The mean number of colonies (MNC) was increased using 180 mJ/cm2 laser by 13.2% (p < 0.01); 6 and 12 microg/ml PG by 19.2% (p < 0.0025) and 13.2% (p = 0.01); laser + PG 6 microg/ml by 23.2% (p < 0.001) and laser + PG 12 microg/ml by 20.5% (p < 0.001). An additional significant increase of 8.8% (p < 0.05) and an insignificant 6.4% (p = 0.086) by laser + PG 6 microg/ml and laser + PG 12 microg/ml were observed, respectively, when compared to the solitary effect of laser.
  
  
  CONCLUSIONS
  Results suggest that the He:Ne laser or PG can stimulate CHO cell proliferation and that further stimulation can be achieved by using the He:Ne laser and PG simultaneously. This combination could be useful as a new treatment modality.
authors.affiliation: Biological and Medical Research Department, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia. watban@kfshrc.edu.sa
authors.forename: F A
authors.initials: FA
authors.lastname: Al-Watban
authors.forename: B L
authors.initials: BL
authors.lastname: Andres
mesh_terms: D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D005260:Female; D006133:Growth Substances / Q000494:pharmacology*; D028022:Low-Level Light Therapy
chemical_list: D006133:Growth Substances