title: Immunohistochemical study of epithelial-myofibroblast interaction in Barrett metaplasia.
abstract: BACKGROUND
  Sub-epithelial myofibroblasts are known to influence the biology (proliferation, differentiation and apoptosis) of overlying epithelia. In the intestine, myofibroblasts have been demonstrated to be essential for epithelial differentiation. It is therefore hypothesized that myofibroblasts may also be involved in intestinal metaplasia that is characteristic of Barrett esophagus.
  
  
  OBJECTIVE
  This study endeavors to immunohistologically evaluate epithelial-myofibroblast interaction in Barrett's metaplasia.
  
  
  METHODS
  Nineteen archival esophageal endoscopic biopsies of Barrett's metaplasia were immune-phenotyped for the following epithelial and myofibroblast antigens - cytokeratins (CK) 8, 13, 18, CDX2 (Caudal type homeobox 2), a-smooth muscle actin (SMA).
  
  
  RESULTS
  alpha-SMA immunostaining revealed close association between myofibroblasts and metaplastic Barrett's epithelium but not with normal esophageal squamous epithelium. Myofibroblasts were more prominent in dysplastic than in non-dysplastic Barrett metaplasia. CDX2 and CK 8/18, indicators of intestinal differentiation were expressed in Barrett metaplasia but not normal esophageal squamous epithelium, while the reverse was the case for CK 13, which only stained normal esophageal squamous epithelium.
  
  
  CONCLUSIONS
  Although their precise role is yet to be clearly defined, sub-epithelial myofibroblasts are very likely involved in the pathogenesis of Barrett's metaplasia.
authors.affiliation: Department of Pathology, Bayero University Kano, Nigeria.
authors.forename: O
authors.initials: O
authors.lastname: Ochicha
authors.forename: J H
authors.initials: JH
authors.lastname: Pringle
authors.forename: A Z
authors.initials: AZ
authors.lastname: Mohammed
mesh_terms: D000199:Actins / Q000032:analysis; D001471:Barrett Esophagus / Q000473:pathology*; D001706:Biopsy; D000071616:CDX2 Transcription Factor; D004847:Epithelial Cells / Q000473:pathology*; D005347:Fibroblasts / Q000473:pathology*; D018398:Homeodomain Proteins / Q000032:analysis; D006801:Humans; D007150:Immunohistochemistry; D007633:Keratins / Q000032:analysis; D008679:Metaplasia / Q000473:pathology*; D008853:Microscopy; D032446:Myoblasts / Q000473:pathology*
chemical_list: D000199:Actins; D000071616:CDX2 Transcription Factor; C491270:CDX2 protein, human; D018398:Homeodomain Proteins; D007633:Keratins