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Regulation of gamma-glutamyl-transpeptidase and alkaline-phosphatase activities in immortalized rat-brain microvessel endothelial-cells

Academic Article
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Overview

authors

  • Roux, F.
  • Durieutrautmann, O.
  • Chaverot, N.
  • Claire, M.
  • Mailly, P.
  • Bourre, J. M.
  • Strosberg, Donny
  • Couraud, P. O.

publication date

  • April 1994

journal

  • Journal of Cellular Physiology  Journal

abstract

  • Rat brain microvessel endothelial cells were immortalized by transfection with a plasmid containing the E1A adenovirus gene. One clone, called RBE4, was further characterized. These cells display a nontransformed phenotype and express typical endothelial markers, Factor VIII-related antigen and Bandeiraea simplicifolia binding sites. When RBE4 cells were grown in the presence of bFGF and on collagen-coated dishes, confluent cultures developed sprouts that extend above the monolayer and organized into three-dimensional structures. The activity of the blood-brain barrier-associated enzyme, gamma-glutamyl transpeptidase (gamma GTP), was expressed in these structures, not in the surrounding monolayer. Similar results were obtained with the microvessel-related enzyme alkaline phosphatase (ALP). Addition of agents that elevate intracellular cAMP reduced the formation of three-dimensional structures, but every cell inside the aggregates still expressed gamma GTP and ALP activities. Such structures, associated with high levels of gamma GTP and ALP activities, were also induced by astroglial factors, including (1) plasma membranes from newborn rat primary astrocytes or rat glioma C6 cells, (2) C6 conditioned media, or (3) diffusible factors produced by primary astrocytes grown in the presence of, but not in contact with RBE4 cells. RBE4 cells thus remain sensitive to angiogenic and astroglial factors for the expression of the blood-brain barrier-related gamma GTP activity, as well as for ALP activity, and could constitute the basis of a valuable in vitro model of the blood-brain barrier.

subject areas

  • Alkaline Phosphatase
  • Animals
  • Astrocytes
  • Blotting, Southern
  • Brain
  • Cells, Cultured
  • Endothelium, Vascular
  • Fibroblast Growth Factor 2
  • Microcirculation
  • Phenotype
  • Rats
  • Rats, Sprague-Dawley
  • Transfection
  • gamma-Glutamyltransferase
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Identity

International Standard Serial Number (ISSN)

  • 0021-9541

Digital Object Identifier (DOI)

  • 10.1002/jcp.1041590114

PubMed ID

  • 7908023
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Additional Document Info

start page

  • 101

end page

  • 113

volume

  • 159

issue

  • 1

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