title: [Effect of vacuum-assisted closure on the expression of urokinase-type plasminogen activator and urokinase-type plasminogen activator receptor in acute and chronic wounds healing].
abstract: OBJECTIVE
  To study the effect of vacuum-assisted closure (V.A.C) on the expression of Urokinase-type plasminogen activator (uPA) and Urokinase-type plasminogen activator receptor(uPAR) protein in margin tissue of pigs with acute wounds and patients with chronic wounds.
  
  
  METHODS
  Acute wounds were created on the two side of five male pigs' back, the experiment wounds on one side received V. A. C treatment and the control side received traditional treatment. Punch biopsies were taken from margin tissue of the wounds in 0, 1, 3, 6, 9, 12, 18, 25 days after the V.A.C treatment. The uPA and uPAR positive cells were stained with immunohistochemical technique . Six human chronic wounds were also treated with the V. A. C treatment, and the samples of extravasate from those wounds were collected in 0, 1, 3, 5, 7 days after the treatment, and the levels of uPA and uPAR expression were examined by enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  The expression of uPA and uPAR protein in margin tissues of pigs with acute wounds increased and peaked in 3 days after the treatment with V. A. C, then it presented rapidly downtrend, but the expression and staining in the experiment group were obviously higher than that of the control group. In the six chronic wounds, the high level expression of uPA and uPAR protein was decreased after the treatment with V. A. C.
  
  
  CONCLUSIONS
  The V. A. C may increase the expression of uPA and uPAR protein in acute wound keratinocytes and decrease the high expression of uPA and uPAR in chronic wounds.
authors.affiliation: Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, China.
authors.forename: Yue-Jun
authors.initials: YJ
authors.lastname: Li
authors.forename: Da-Yong
authors.initials: DY
authors.lastname: Cao
authors.forename: Shao-Zong
authors.initials: SZ
authors.lastname: Chen
mesh_terms: D000328:Adult; D000818:Animals; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D054843:Negative-Pressure Wound Therapy; D055293:Receptors, Urokinase Plasminogen Activator / Q000378:metabolism*; D013552:Swine; D014568:Urokinase-Type Plasminogen Activator / Q000378:metabolism*; D014945:Wound Healing
chemical_list: D055293:Receptors, Urokinase Plasminogen Activator; D014568:Urokinase-Type Plasminogen Activator