Cell and Tissue Research

, Volume 315, Issue 2, pp 157–166

Astrocyte mediated modulation of blood-brain barrier permeability does not correlate with a loss of tight junction proteins from the cellular contacts

  • Stefan Hamm
  • Bénédicte Dehouck
  • Jörg Kraus
  • Karen Wolburg-Buchholz
  • Hartwig Wolburg
  • Werner Risau
  • Roméo Cecchelli
  • Britta Engelhardt
  • Marie-Pierre Dehouck
Regular Article

DOI: 10.1007/s00441-003-0825-y

Cite this article as:
Hamm, S., Dehouck, B., Kraus, J. et al. Cell Tissue Res (2004) 315: 157. doi:10.1007/s00441-003-0825-y

Abstract

In the central nervous system (CNS) complex endothelial tight junctions (TJs) form a restrictive paracellular diffusion barrier, the blood-brain barrier (BBB). Pathogenic changes within the CNS are frequently accompanied by the loss of BBB properties, resulting in brain edema. In order to investigate whether BBB leakiness can be monitored by a loss of TJ proteins from cellular borders, we used an in vitro BBB model where brain endothelial cells in co-culture with astrocytes form a tight permeability barrier for 3H-inulin and 14C-sucrose. Removal of astrocytes from the co-culture resulted in an increased permeability to small tracers across the brain endothelial cell monolayer and an opening of the TJs to horseradish peroxidase as detected by electron microscopy. Strikingly, opening of the endothelial TJs was not accompanied by any visible change in the molecular composition of endothelial TJs as junctional localization of the TJ-associated proteins claudin-3, claudin-5, occludin, ZO-1 or ZO-2 or the adherens junction-associated proteins β-catenin or p120cas did not change. Thus, opening of BBB TJs is not readily accompanied by the complete loss of the junctional localization of TJ proteins.

Keywords

ClaudinsOccludinTight junctionEdema formationBlood-brain barrierCell culture (bovine, rat)

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Stefan Hamm
    • 1
    • 6
  • Bénédicte Dehouck
    • 1
    • 3
  • Jörg Kraus
    • 1
    • 2
  • Karen Wolburg-Buchholz
    • 1
    • 5
  • Hartwig Wolburg
    • 5
  • Werner Risau
  • Roméo Cecchelli
    • 3
  • Britta Engelhardt
    • 1
    • 2
    • 4
  • Marie-Pierre Dehouck
    • 3
  1. 1.Max Planck Institute for Physiological and Clinical ResearchBad NauheimGermany
  2. 2.Max Planck Institute for Vascular BiologyMünsterGermany
  3. 3.Unité mixte Institut Pasteur de Lille-Université d’ArtoisU.A. 2465-Faculté des Sciences Jean PerrinLensFrance
  4. 4.Theodor Kocher InstituteUniversity of BernBernSwitzerland
  5. 5.Institute for PathologyTübingenGermany
  6. 6.Wyeth Vaccine ResearchPearl RiverUSA