title: Functional characterization of cultured keratinocytes after acute cutaneous burn injury.
abstract: BACKGROUND
  In addition to forming the epithelial barrier against the outside environment keratinocytes are immunologically active cells. In the treatment of severely burned skin, cryoconserved keratinocyte allografts gain in importance. It has been proposed that these allografts accelerate wound healing also due to the expression of a favourable--keratinocyte-derived--cytokine and growth factor milieu.
  
  
  METHODS
  In this study the morphology and cytokine expression profile of keratinocytes from skin after acute burn injury was compared to non-burned skin. Skin samples were obtained from patients after severe burn injury and healthy controls. Cells were cultured and secretion of selected inflammatory mediators was quantified using Bioplex Immunoassays. Immunohistochemistry was performed to analyse further functional and morphologic parameters.
  
  
  RESULTS
  Histology revealed increased terminal differentiation of keratinocytes (CK10, CK11) in allografts from non-burned skin compared to a higher portion of proliferative cells (CK5, vimentin) in acute burn injury. Increased levels of IL-1α, IL-2, IL-4, IL-10, IFN-γ and TNFα could be detected in culture media of burn injury skin cultures. Both culture groups contained large amounts of IL-1RA. IL-6 and GM-CSF were increased during the first 15 days of culture of burned skin compared to control skin. Levels of VEGF, FGF-basic, TGF-ß und G-CSF were high in both but not significantly different. Cryoconservation led to a diminished mediator synthesis except for higher levels of intracellular IL-1α and IL-1ß.
  
  
  CONCLUSIONS
  Skin allografts from non-burned skin show a different secretion pattern of keratinocyte-derived cytokines and inflammatory mediators compared to keratinocytes after burn injury. As these secreted molecules exert auto- and paracrine effects and subsequently contribute to healing and barrier restoration after acute burn injury therapies affecting this specific cytokine/growth factor micromilieu could be beneficial in burned patients.
authors.affiliation: Department of Dermatology and Allergy, Ludwig-Maximilian University, Munich, Germany. gerd.gauglitz@med.uni-muenchen.de
authors.forename: Gerd G
authors.initials: GG
authors.lastname: Gauglitz
authors.forename: Siegfried
authors.initials: S
authors.lastname: Zedler
authors.forename: Felix
authors.initials: F
authors.lastname: von Spiegel
authors.forename: Jasmin
authors.initials: J
authors.lastname: Fuhr
authors.forename: Guido Henkel
authors.initials: GH
authors.lastname: von Donnersmarck
authors.forename: Eugen
authors.initials: E
authors.lastname: Faist
mesh_terms: D002056:Burns / Q000473:pathology*; D016022:Case-Control Studies; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism; D006801:Humans; D015603:Keratinocytes / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D012867:Skin / Q000473:pathology*; D014184:Transplantation, Homologous; D014945:Wound Healing
chemical_list: D016207:Cytokines