Cell and Tissue Research

, Volume 280, Issue 2, pp 455–462

Intermediate filament typing of the human embryonic and fetal notochord

  • Werner Götz
  • Michael Kasper
  • Gösta Fischer
  • Rainer Herken
Article

Abstract

In order to characterize human notochordal tissue we investigated notochords from 32 human embryos and fetuses ranging between the 5th and 13th gestational week, using immunohistochemistry to detect intermediate filament proteins cytokeratin, vimentin and desmin, the cytokeratin subtypes 7, 8, 18, 19 and 20, epithelial membrane antigen (EMA), and adhesion molecules pan-cadherin and E-cadherin. Strong immunoreactions could be demonstrated for pan-cytokeratin, but not for desmin or EMA. Staining for pan-cadherin and weak staining for E-cadherin was found on cell membranes of notochordal cells. Also it was demonstrated that notochordal cells of all developmental stages contain the cytokeratins 8, 18 and19, but not 7 or 20. Some cells in the embryonic notochord also contained some vimentin. Vimentin reactivity increased between the 8th and 13th gestational week parallel to morphological changes leading from an epithelial phenotype to the chorda reticulum which represents a mesenchymal tissue within the intervertebral disc anlagen. This coexpression reflects the epithelial-mesenchymal transformation of the notochord, which also loses E-cadherin expression during later stages. Our findings cannot elucidate a histogenetic germ layer origin of the human notochord but demonstrate its epithelial character. Thus, morphogenetic inductive processes between the human notochord and its surrounding vertebral column anlagen can be classified as epithelial-mesenchymal interactions.

Key words

Intermediate filaments Notochord Cytokeratins Cadherins Human, embryo 

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Werner Götz
    • 1
  • Michael Kasper
    • 2
  • Gösta Fischer
    • 3
  • Rainer Herken
    • 1
  1. 1.Abt. HistologieZentrum Anatomie der Georg-August-Universität GöttingenGöttingenGermany
  2. 2.Institut für PathologieUniversitätsklinikum Carl Gustav Carus der Technischen UniversitätDresdenGermany
  3. 3.Abt. Allgemeine Pathologie und Pathologische Anatomie IIZentrum Pathologie, UniversitätsklinikumGöttingenGermany

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