title: In vitro observations on the influence of copper peptide aids for the LED photoirradiation of fibroblast collagen synthesis.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the influence of Cu-GHK aids for the LED-PI on fibroblast proliferation and collagen production in vitro.
  
  
  BACKGROUND
  Light-emitting diode photoirradiation (LED-PI) and copper-glycyl-L-histidyl-L-lysine complex (Cu-GHK) treatment may be useful in accelerating the rate of wound healing. Red LED (625-635 nm) was used as a light source for LED-PI. In the process of wound healing, Cu-GHK was shown to be an activator of remodeling. LED-PI would maintain fibroblast activity and viability, and there would be a positive effect on type I collagen (COL1) and basic fibroblast growth factor (bFGF) production from the combination of LED-PI and Cu-GHK incorporation.
  
  
  METHODS
  Cell activity/viability, procollagen type I C-peptide (P1CP), and bFGF were evaluated in vitro with human fibroblasts (HS68). The effects of single factors (LED-PI using 0, 1, and 2 J energy doses) or a combination of factors (LED-PI and Cu-GHK) on fibroblast viability (i.e., alamarBlue reduction), collagen production (i.e., P1CP production and COL1 mRNA expression), and bFGF secretion were also evaluated.
  
  
  RESULTS
  Reduction in cell viability was significantly suppressed with LED-PI (1 J) and Cu-GHK-supplied incubation. Cell viability was increased 12.5-fold compared with the non-irradiated group (0 J). Collagen production was also increased significantly with LED-PI and Cu-GHK incorporation (197.6 ng/mL). A dose-response effect was observed for LED-PI combined with Cu-GHK. The combinative effects of LED-PI and Cu-GHK led to an increase not only in bFGF secretion (approximately 230%) but also in P1CP production (approximately 30%) and COL1 mRNA expression (approximately 70%) compared with LED-PI alone.
  
  
  CONCLUSIONS
  LED-PI maintained human fibroblast (HS68) viability and increased collagen synthesis when applied by itself. In the combinative stimulation for in vitro collagen production (when LED-PI was followed by Cu-GHK-supplied incubation), stimulated cells showed increased bFGF secretion, P1CP production, and COL1 expression, compared to the LED-PI treatment alone.
authors.affiliation: Biomedical Electronics Technology Division, Medical Electronics and Device Technology Center, Industrial Technology Research Institute, Hsinchu, Taiwan, R.O.C.
authors.forename: Pei-Jane
authors.initials: PJ
authors.lastname: Huang
authors.forename: Yi-Chau
authors.initials: YC
authors.lastname: Huang
authors.forename: Mei-Fang
authors.initials: MF
authors.lastname: Su
authors.forename: Tzu-Yi
authors.initials: TY
authors.lastname: Yang
authors.forename: Jone-Ray
authors.initials: JR
authors.lastname: Huang
authors.forename: Cho-Pei
authors.initials: CP
authors.lastname: Jiang
mesh_terms: D024042:Collagen Type I / Q000378:metabolism; D004306:Dose-Response Relationship, Immunologic; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D005347:Fibroblasts / Q000378:metabolism* / Q000528:radiation effects*; D006801:Humans; D028022:Low-Level Light Therapy; D008239:Lysine; D009842:Oligopeptides; D009942:Organometallic Compounds; D014945:Wound Healing / Q000528:radiation effects
chemical_list: D024042:Collagen Type I; D009842:Oligopeptides; D009942:Organometallic Compounds; C053976:copper-lysine complex; D016222:Fibroblast Growth Factor 2; C098469:copper-glycyl-glycyl-histidine; D008239:Lysine