title: Dose-dependent effect of mitomycin C on human vocal fold fibroblasts.
abstract: BACKGROUND
  The purpose of this study was to evaluate in vitro cytotoxicity and antifibrotic effects of mitomycin C on normal and scarred human vocal fold fibroblasts.
  
  
  METHODS
  Fibroblasts were subjected to mitomycin C treatment at 0.2, 0.5, or 1 mg/mL, or serum control. Cytotoxicity, immunocytochemistry, and Western blot for collagen I/III were performed at days 0, 1, 3, and 5.
  
  
  RESULTS
  Significant decreases in live cells were measured for mitomycin C-treated cells on days 3 and 5 for all doses. Extracellular staining of collagen I/III was observed in mitomycin C-treated cells across all doses and times. Extracellular staining suggests apoptosis with necrosis, compromising the integrity of cell membranes and release of cytosolic proteins into the extracellular environment. Western blot indicates inhibition of collagen at all doses except 0.2 mg/mL at day 1.
  
  
  CONCLUSIONS
  A total of 0.2 mg/mL mitomycin C may provide initial and transient stimulation of collagen for necessary repair to damaged tissue without the long-term risk of fibrosis.
authors.affiliation: Department of Hearing and Speech Sciences, University of Maryland-College Park, College Park, Maryland.
authors.forename: Nicole Y K
authors.initials: NY
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Chen
authors.forename: Frederik G
authors.initials: FG
authors.lastname: Dikkers
authors.forename: Susan L
authors.initials: SL
authors.lastname: Thibeault
mesh_terms: D000477:Alkylating Agents / Q000008:administration & dosage*; D015153:Blotting, Western; D002921:Cicatrix / Q000517:prevention & control*; D004305:Dose-Response Relationship, Drug; D005355:Fibrosis; D006801:Humans; D007150:Immunohistochemistry; D016685:Mitomycin / Q000008:administration & dosage*; D014827:Vocal Cords / Q000166:cytology* / Q000473:pathology; D014945:Wound Healing / Q000502:physiology*
chemical_list: D000477:Alkylating Agents; D016685:Mitomycin
keywords: fibroblasts; larynx; mitomycin C; surgical scar; vocal folds