title: The expression of microfilament-associated cell-cell contacts in brain endothelial cells is modified by IFN-beta1a (Rebif).
abstract: In multiple sclerosis (MS), a crucial step in the induction phase of the inflammatory process in the central nervous system (CNS) is the disruption of the endothelial blood-brain barrier (BBB). Its permeability depends on the expression of intercellular adhesion molecules, such as vinculin and N-cadherin in endothelial cells. Interferon-gamma (IFN-gamma), as a proinflammatory cytokine, decreases the expression of both adhesion molecules in epithelial and astrocytic cells, whereas IFN-beta1a, an established treatment for MS, increases the expression of N-cadherin and vinculin in astrocytic cells and is postulated to preserve endothelial cell barrier function and to inhibit transendothelial migration of activated leukocytes. We analyzed the expression of N-cadherin and vinculin in a murine brain endothelial cell line by immunofluorescence staining and Western blot to study the presumed reversal effects of IFN-beta1a (Rebif, Serono Pharma, Unterschleissheim, Germany) and IFN-gamma on the formation of intercellular contacts. Vinculin and N-cadherin expression in brain endothelial cells was decreased after treatment with IFN-gamma, whereas stimulation with IFN-beta1a caused increased expression of both adhesion molecules. Combined treatment with both IFNs did not affect vinculin and N-cadherin expression. These data suggest that IFN-gamma contributes to BBB disruption by decreasing and IFN-beta1a restores the BBB by an upregulation of vinculin and N-cadherin expression in brain endothelial cells. This action of IFN-beta1a may contribute to its beneficial effects in MS therapy.
authors.affiliation: Department of Neurology, University of Bonn, Germany. neurologie@uni-bonn.de
authors.forename: Michael
authors.initials: M
authors.lastname: Harzheim
authors.forename: Manuela
authors.initials: M
authors.lastname: Stepien-Mering
authors.forename: Rolf
authors.initials: R
authors.lastname: Schröder
authors.forename: Stephan
authors.initials: S
authors.lastname: Schmidt
mesh_terms: D008841:Actin Cytoskeleton / Q000378:metabolism; D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D001921:Brain / Q000166:cytology* / Q000187:drug effects; D015820:Cadherins / Q000378:metabolism*; D002448:Cell Adhesion / Q000187:drug effects; D002450:Cell Communication / Q000187:drug effects; D002478:Cells, Cultured; D015536:Down-Regulation; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D000068556:Interferon beta-1a; D016899:Interferon-beta / Q000494:pharmacology* / Q000627:therapeutic use; D007371:Interferon-gamma / Q000494:pharmacology; D051379:Mice; D009103:Multiple Sclerosis / Q000188:drug therapy / Q000378:metabolism; D015854:Up-Regulation; D016596:Vinculin / Q000378:metabolism*
chemical_list: D015820:Cadherins; D016596:Vinculin; D016899:Interferon-beta; D007371:Interferon-gamma; D000068556:Interferon beta-1a