title: Autologous buccal keratinocyte implantation for the prevention of stenosis after EMR of the esophagus.
abstract: BACKGROUND
  EMR is a minimally invasive and well-accepted therapy for early esophageal cancer. However, extensive or circumferential EMR induces stricture formation. Cultured skin is now clinically applicable by using the technology of regenerative medicine. Esophageal mucosa also consists of keratinocytes, the same as with skin. We, therefore, hypothesized that, by applying the technology of regenerative medicine, the stricture occurring in the esophagus after EMR on broad lesions could be prevented.
  
  
  OBJECTIVE
  The aim of this study was to evaluate, in a swine model, the effect of autologous keratinocyte implantation at the site after EMR to prevent stricture.
  
  
  METHODS
  With the pig under general anesthesia, EMR was carried out by using the cap technique. Two separate areas were resected by EMR. One area was left as a control. For the other area, autologous buccal keratinocytes were injected endoscopically.
  
  
  METHODS
  The outcome, after 2 weeks, was evaluated by endoscopy, macroscopy, and histology.
  
  
  RESULTS
  At 2 weeks after EMR, scar formation and stricture were observed in the control lesion. However, in the keratinocyte implanted lesion, the lesion was covered with an epithelium and the luminal surface of the lesion was flat, without ulceration.
  
  
  CONCLUSIONS
  These results showed the feasibility of performing autologous keratinocyte implantation after EMR and the effect for early reepithelialization.
authors.affiliation: Division of Advanced Surgical Science and Technology, Graduate School of Medicine, Tohoku University, Sendai, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Sakurai
authors.forename: Shukichi
authors.initials: S
authors.lastname: Miyazaki
authors.forename: Go
authors.initials: G
authors.lastname: Miyata
authors.forename: Susumu
authors.initials: S
authors.lastname: Satomi
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Hori
mesh_terms: D000818:Animals; D004940:Esophageal Stenosis / Q000209:etiology* / Q000473:pathology / Q000517:prevention & control*; D004945:Esophagoscopy / Q000009:adverse effects*; D015603:Keratinocytes / Q000637:transplantation*; D009061:Mouth Mucosa / Q000166:cytology*; D009092:Mucous Membrane / Q000601:surgery; D013552:Swine; D000267:Tissue Adhesions / Q000209:etiology / Q000473:pathology / Q000517:prevention & control; D014182:Transplantation, Autologous; D014945:Wound Healing