title: Impaired balance of type I and type III procollagen mRNA in cultured fibroblasts of patients with incisional hernia.
abstract: BACKGROUND
  Recent findings of an impaired protein ratio of type I to type III procollagen showed a disturbed collagen metabolism in incisional hernia development. We analyzed the type I and type III procollagen messenger RNA to investigate whether these findings represent the altered extracellular matrix or a primary defect at the transcriptional level.
  
  
  METHODS
  We examined cultured skin fibroblasts of patients with incisional or recurrent incisional hernia in comparison with those without any previous incision (control) and those with a skin scar without clinical appearance of a hernia (scar). Immunohistochemical detection of a lowered protein ratio of type I and type III collagen in the hernia skin tissue leads to mRNA expression analysis. The procollagen mRNA and the ratio of type I to type III procollagen mRNA are detected by reverse transcriptase-polymerase chain reaction and Northern blot analysis, the collagens type I and III by Western blot analysis.
  
  
  RESULTS
  Reverse transcriptase-polymerase chain reaction revealed an increase of type I procollagen mRNA in the incisional and recurrent hernia (0.90 +/- 0.04 and 1.19 +/- 0.04, respectively) compared with stable scar (0.54 +/- 0.02) or healthy tissue (0.43 +/- 0.01). The obvious rise of type III procollagen mRNA to 4.13 +/- 0.04 for incisional, 6.02 +/- 0.03 for recurrent hernia, 2.29 +/- 0.04 for stable scar, and 1.72 +/- 0.03 for the healthy tissue showed a significantly decreased ratio of type I to type III procollagen mRNA in the hernia patients as compared with the controls (P <.01). By Western blot analysis, an increase of type I and type III collagen protein and a significant rise in the corresponding ratio in the recurrent hernia group were detected.
  
  
  CONCLUSIONS
  The altered synthesis of type I and type III collagen in cultured skin fibroblasts suggests a disorder of collagen metabolism, at least in patients with recurrent hernia. Hence, a basically impaired wound healing process is likely to contribute to the unsatisfactory results of incisional hernia repair.
authors.affiliation: Department of Surgery, the Department of Internal Medicine II, and the Institute of Pathology, Technical University of Aachen, Aachen, Germany.
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Si
authors.forename: Rhanjit
authors.initials: R
authors.lastname: Bhardwaj
authors.forename: Raphael
authors.initials: R
authors.lastname: Rosch
authors.forename: Peter Rene
authors.initials: PR
authors.lastname: Mertens
authors.forename: Bernd
authors.initials: B
authors.lastname: Klosterhalfen
authors.forename: Uwe
authors.initials: U
authors.lastname: Klinge
authors.forename: Bhardwaj
authors.initials: B
authors.lastname: Rhanjit
authors.forename: Peter Merten
authors.initials: PM
authors.lastname: Rene
mesh_terms: D015153:Blotting, Western; D002478:Cells, Cultured; D024042:Collagen Type I / Q000235:genetics* / Q000378:metabolism; D024061:Collagen Type III / Q000235:genetics* / Q000378:metabolism; D005260:Female; D005347:Fibroblasts / Q000378:metabolism*; D006547:Hernia / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D024042:Collagen Type I; D024061:Collagen Type III; D012333:RNA, Messenger