title: Keratin expression reveals mosaic differentiation in vaginal epithelium.
abstract: OBJECTIVE
  Analyzing the expression of keratins has proved to be valuable for identifying of pathways of epithelial differentiation. In stratified epithelia K10 and K13 are representative for either the keratinizing (epidermal-type) or the nonkeratinizing pathway.
  
  
  METHODS
  We have investigated keratin expression in "normal" vaginal epithelium from 30 women, applying two-color immunofluorescence with monoclonal antibodies to K10 and K13 on cryostat sections and cell smears.
  
  
  RESULTS
  A differential expression pattern of vaginal cells dependent on their localization within the epithelium was found. In cells of the first suprabasal layers differentiation began and became identifiable by a weak expression of K13. The adjacent layers displayed cells that concurrently expressed K10 and K13. In contrast, cells within the superficial strata expressed exclusively either one of the two keratins.
  
  
  CONCLUSIONS
  Thus vaginal epithelium appears to be mosaic in differentiation, showing simultaneous expression of keratins K10 and K13, thought to be representative for distinct routes of differentiation.
authors.affiliation: Department of Obstetrics and Gynecology, Steglitz Medical Center, Berlin, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Schaller
authors.forename: E
authors.initials: E
authors.lastname: Lengyel
authors.forename: K
authors.initials: K
authors.lastname: Pantel
authors.forename: W
authors.initials: W
authors.lastname: Hardt
authors.forename: D
authors.initials: D
authors.lastname: Mischke
mesh_terms: D000328:Adult; D000368:Aged; D002454:Cell Differentiation; D002455:Cell Division; D004847:Epithelial Cells; D004848:Epithelium / Q000737:chemistry; D005260:Female; D006801:Humans; D053550:Keratin-10; D007633:Keratins / Q000032:analysis*; D008875:Middle Aged; D014621:Vagina / Q000737:chemistry / Q000166:cytology*
chemical_list: C507493:KRT10 protein, human; D053550:Keratin-10; D007633:Keratins