title: Anti-angiogenic activity of the mutant Dutch A(beta) peptide on human brain microvascular endothelial cells.
abstract: Cerebral amyloid angiopathy is a common pathological feature of patients with Alzheimer's disease (AD) and it is also the hallmark of individuals with a rare autosomal dominant disorder known as hereditary cerebral hemorrhage with amyloidosis-Dutch type. We have shown previously that wild type A(beta) peptides are anti-angiogenic both in vitro and in vivo and could contribute to the compromised cerebrovascular architecture observed in AD. In the present study, we investigated the potential anti-angiogenic activity of the Dutch A(beta)(1-40) (E22Q) peptide. We show that compared to wild type A(beta), freshly solubilized Dutch A(beta) peptide more potently inhibits the formation of capillary structures induced by plating human brain microvascular endothelial cells onto a reconstituted basement membrane. Aggregated/fibrillar preparations of wild type A(beta) and Dutch A(beta) do not appear to be anti-angiogenic in this assay. The stronger anti-angiogenic activity of the Dutch A(beta) compared to wild type A(beta) appears to be related to the increased formation of low molecular weight A(beta) oligomers in the culture medium surrounding human brain microvascular endothelial cells. Using oligonucleotide microarray analysis of human brain microvascular endothelial cells, followed by a genome-scale computational analysis with the Ingenuity Pathways Knowledge Base, networks of genes affected by an anti-angiogenic dose of Dutch A(beta) were identified. This analysis highlights that several biological networks involved in angiogenesis, tumorigenesis, atherosclerosis, cellular migration and proliferation are disrupted in human brain microvascular endothelial cells exposed to Dutch A(beta). Altogether, these data provide new molecular clues regarding the pathological activity of Dutch A(beta) peptide in the cerebrovasculature.
authors.affiliation: The Roskamp Institute, 2040 Whitfield Avenue, Sarasota, FL 34243, USA. dparis@rfdn.org
authors.forename: Daniel
authors.initials: D
authors.lastname: Paris
authors.forename: Ghania
authors.initials: G
authors.lastname: Ait-Ghezala
authors.forename: Venkatarajan S
authors.initials: VS
authors.lastname: Mathura
authors.forename: Nikunj
authors.initials: N
authors.lastname: Patel
authors.forename: Amita
authors.initials: A
authors.lastname: Quadros
authors.forename: Vincent
authors.initials: V
authors.lastname: Laporte
authors.forename: Mike
authors.initials: M
authors.lastname: Mullan
mesh_terms: D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000235:genetics / Q000494:pharmacology*; D015153:Blotting, Western / Q000379:methods; D001921:Brain / Q000166:cytology* / Q000254:growth & development; D002449:Cell Aggregation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D016000:Cluster Analysis; D003198:Computer Simulation; D003224:Congo Red; D004305:Dose-Response Relationship, Drug; D042783:Endothelial Cells / Q000187:drug effects*; D004730:Endothelium, Vascular / Q000166:cytology* / Q000254:growth & development; D006801:Humans; D008958:Models, Molecular; D009024:Morphogenesis / Q000187:drug effects; D009154:Mutation; D009389:Neovascularization, Pathologic / Q000503:physiopathology*; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C078592:amyloid beta-protein (1-40); D003224:Congo Red