title: von-Willebrand factor influences blood brain barrier permeability and brain inflammation in experimental allergic encephalomyelitis.
abstract: Weibel-Palade bodies within endothelial cells are secretory granules known to release von Willebrand Factor (VWF), P-selectin, chemokines, and other stored molecules following histamine exposure. Mice with a disrupted VWF gene (VWFKO) have endothelial cells that are deficient in Weibel-Palade bodies. These mice were used to evaluate the role of VWF and/or Weibel-Palade bodies in Bordetella pertussis toxin-induced hypersensitivity to histamine, a subphenotype of experimental allergic encephalomyelitis, the principal autoimmune model of multiple sclerosis. No significant differences in susceptibility to histamine between wild-type and VWFKO mice were detected after 3 days; however, histamine sensitivity persisted significantly longer in VWFKO mice. Correspondingly, encephalomyelitis onset was earlier, disease was more severe, and blood brain barrier (BBB) permeability was significantly increased in VWFKO mice, as compared with wild-type mice. Moreover, inflammation was selectively increased in the brains, but not spinal cords, of VWFKO mice as compared with wild-type mice. Early increases in BBB permeability in VWFKO mice were not due to increased encephalitogenic T-cell activity since BBB permeability did not differ in adjuvant-treated VWFKO mice as compared with littermates immunized with encephalitogenic peptide plus adjuvant. Taken together, these data indicate that VWF and/or Weibel-Palade bodies negatively regulate BBB permeability changes and autoimmune inflammatory lesion formation within the brain elicited by peripheral inflammatory stimuli.
authors.affiliation: Department of Medicine, University of Vermont, Burlington, VT 05405, USA.
authors.forename: Rajkumar
authors.initials: R
authors.lastname: Noubade
authors.forename: Roxana
authors.initials: R
authors.lastname: del Rio
authors.forename: Benjamin
authors.initials: B
authors.lastname: McElvany
authors.forename: James F
authors.initials: JF
authors.lastname: Zachary
authors.forename: Jason M
authors.initials: JM
authors.lastname: Millward
authors.forename: Denisa D
authors.initials: DD
authors.lastname: Wagner
authors.forename: Halina
authors.initials: H
authors.lastname: Offner
authors.forename: Elizabeth P
authors.initials: EP
authors.lastname: Blankenhorn
authors.forename: Cory
authors.initials: C
authors.lastname: Teuscher
mesh_terms: D000276:Adjuvants, Immunologic / Q000378:metabolism; D000818:Animals; D001812:Blood-Brain Barrier / Q000378:metabolism* / Q000473:pathology; D001921:Brain / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D002199:Capillary Permeability / Q000502:physiology*; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D006632:Histamine / Q000276:immunology; D006967:Hypersensitivity / Q000276:immunology; D007249:Inflammation / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020302:Weibel-Palade Bodies / Q000378:metabolism; D014841:von Willebrand Factor / Q000235:genetics / Q000378:metabolism*
chemical_list: D000276:Adjuvants, Immunologic; D014841:von Willebrand Factor; D006632:Histamine