Cell and Tissue Research

, Volume 266, Issue 3, pp 553–561 | Cite as

Developmental expression of glial markers in ependymocytes of the rat subcommissural organ: role of the environment

  • L. Chouaf
  • M. Didier-Bazes
  • H. Hardin
  • M. Aguera
  • M. Fevre-Montange
  • B. Voutsinos
  • M. F. Belin


The rat subcommissural organ (SCO), principally composed of modified ependymocytes (a type of glial cell), is a suitable model for the in vivo study of glial differentiation. An immunohistochemical study of the ontogenesis of rat SCO-ependymocytes from embryonic day 13 to postnatal day 10 shows that these cells express transitory glial fibrillary acidic protein (GFAP) from embryonic day 19 until postnatal day 3. However, S100 protein (S100) is never expressed in the SCO-cells, contrasting with the ventricle-lining cells of the third ventricle, which contain S100 as early as embryonic day 17. Environmental factors could be responsible for the repression of GFAP and S100 in adult rats, because GFAP and S100 are observed in ependymocytes of SCO 3 months after being grafted from newborn rat into the fourth ventricle of an adult rat. Neuronal factors might be involved in the control of the expression of S100, since after the destruction of serotonin innervation by neurotoxin at birth, S100 can be observed in some SCO-ependymocytes of adult rats. On the other hand, GFAP expression is apparently not affected by serotomin denervation, suggesting the existence of several factors involved in the differentiation of SCO-cells.

Key words

Subcommissural organ Differentiation Transplantation Immunohistochemistry GFAP S100 protein Serotonin Rat (Sprague-Dawley) 


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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • L. Chouaf
    • 1
  • M. Didier-Bazes
    • 1
  • H. Hardin
    • 1
  • M. Aguera
    • 1
  • M. Fevre-Montange
    • 1
  • B. Voutsinos
    • 1
  • M. F. Belin
    • 1
  1. 1.INSERM CJF 90-10, CNRS US 1195, Laboratoire Anatomie PathologiqueFaculté A. CarrelLyon Cedex 08France

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