title: Response of dupuytren fibroblasts to different oxygen environments.
abstract: OBJECTIVE
  It is thought that local ischemia and oxygen radicals are responsible for fibroblast-to-myofibroblast cell transformation and proliferation. We hypothesized that hypoxia could differentially activate the contractility of fibroblasts from normal human palmar fascia and from fibroblasts-myofibroblasts of Dupuytren cords.
  
  
  METHODS
  Normal palmar fascia from 5 patients with carpal tunnel syndrome and Dupuytren cords from 5 patients were harvested. Cells were cultured from all tissue samples, and collagen lattices were prepared containing these cells. Oxygen treatment subgroups were created and incubated under hypoxic (1% O(2), 5% CO(2), and 94% N(2)), normoxic (21% O(2), 5% CO(2), and 74% N(2)), and hyperoxic (100% oxygen using 2.4 atm pressure twice a day for 7 d) conditions. After 7 days, each subgroup was photographed, and lattices were released from dishes. Postrelease photographs were taken immediately, 5 minutes after release, and after 1 hour. Areas of the lattices at each time point were calculated using MetaMorph software. Actin staining and live/dead cell analysis was performed. Linear repeated measures analysis of variance was used for data analysis given that contraction levels were measured over 3 distinct time points.
  
  
  RESULTS
  We found a statistically significant difference between normal samples and Dupuytren samples in mean contraction levels over time. There was no statistically significant difference between tissue groups over the 3 time periods based on the oxygen treatment received.
  
  
  CONCLUSIONS
  Our results showed a greater degree of contractility in Dupuytren disease cells than normal fibroblasts. However, the contraction in either group was not affected by oxygen level. Future in vivo research is needed to better understand the nature of pathophysiology of Dupuytren disease.
authors.affiliation: Christine M. Kleinert Institute for Hand and Microsurgery; the University of Louisville School of Medicine; the Kleinert Kutz Hand Surgery Group; and the Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville and Jewish Hospital/St. Mary's Healthcare, Louisville, KY; and the Department of Surgery, Division of Reconstructive and Plastic Surgery, Hand, Upper Extremity, and Microsurgery; and the Department of Medicine, Division of Transplantation, University of Arizona, Tucson, AZ. Electronic address: drtolgaturker@gmail.com.
authors.forename: Tolga
authors.initials: T
authors.lastname: Türker
authors.forename: Erin
authors.initials: E
authors.lastname: Murphy
authors.forename: Christina L
authors.initials: CL
authors.lastname: Kaufman
authors.forename: Joseph E
authors.initials: JE
authors.lastname: Kutz
authors.forename: Edward A
authors.initials: EA
authors.lastname: Meister
authors.forename: James B
authors.initials: JB
authors.lastname: Hoying
mesh_terms: D002349:Carpal Tunnel Syndrome / Q000378:metabolism / Q000473:pathology / Q000601:surgery; D016022:Case-Control Studies; D002478:Cells, Cultured; D004387:Dupuytren Contracture / Q000378:metabolism* / Q000473:pathology; D005205:Fascia / Q000166:cytology / Q000378:metabolism; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D006931:Hyperbaric Oxygenation / Q000379:methods; D000860:Hypoxia / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D058628:Myofibroblasts / Q000166:cytology / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism / Q000627:therapeutic use*; D012016:Reference Values
chemical_list: D010100:Oxygen
keywords: Dupuytren disease; fibroblast; hyperbaric oxygen treatment; hypoxia; myofibroblast