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Letter to the Editor| Volume 50, ISSUE 3, P227-231, June 2008

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Common features of umbilical cord epithelial cells and epidermal keratinocytes

      Numerous experimental approaches in the field of dermatological research necessarily require the usage of human primary keratinocytes as immortal cell lines generally do not appropriately reflect the in vivo situation. However, the utilization of freshly isolated cells is often hampered by the limited accessibility of human skin biopsies and their derivation from donors of different age, gender and pathological background, as well as from different body sites. Recently it has been reported that the umbilical cord epithelium (UCE) expresses a cytokeratin pattern similar to human epidermis [
      • Mizoguchi M.
      • Ikeda S.
      • Suga Y.
      • Ogawa H.
      Expression of cytokeratins and cornified cell envelope-associated proteins in umbilical cord epithelium: a comparative study of the umbilical cord, amniotic epithelia and fetal skin.
      ], although the general architecture of the umbilical cord epithelium significantly differs from the mammalian epidermis [
      • Hoyes A.D.
      Ultrastructure of the epithelium of the human umbilical cord.
      ]. Furthermore, cells derived from UCE are capable of forming a stratified epithelium when seeded on fibroblast populated collagen gels [
      • Mizoguchi M.
      • Suga Y.
      • Sanmano B.
      • Ikeda S.
      • Ogawa H.
      Organotypic culture and surface plantation using umbilical cord epithelial cells: morphogenesis and expression of differentiation markers mimicking cutaneous epidermis.
      ,
      • Sanmano B.
      • Mizoguchi M.
      • Suga Y.
      • Ikeda S.
      • Ogawa H.
      Engraftment of umbilical cord epithelial cells in athymic mice: in an attempt to improve reconstructed skin equivalents used as epithelial composite.
      ]. We therefore asked whether the umbilical cord could possibly serve as an alternative source for primary neonatal keratinocytes and investigated the similarity of UCE cells and neonatal primary keratinocytes at the molecular and functional level.
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