title: Inhibition of angiogenic properties of brain endothelial cells by platelet-derived sphingosine-1-phosphate.
abstract: The platelet-derived lysophospholipid sphingosine-1-phosphate (S1P) is present in blood plasma and is one of the most potent growth factors displaying proangiogenic activity towards endothelial cells (EC) derived from various tissues. The paracrine regulation of brain angiogenesis by platelet-derived growth factors is, however, poorly understood. In the present study, we assessed the role of S1P on brain EC migration and tubulogenesis, using rat brain-derived (RBE4) EC as an in vitro model. We show that S1P inhibits brain EC migration and tubulogenesis, while it displays proangiogenic activity towards noncerebral EC. Overexpression of the S1P receptor S1P-1 in RBE4 cells potentiated all of the S1P-mediated events. We also show that the lack of expression of MT1-MMP, a membrane-bound matrix metalloproteinase that is thought to cooperate with S1P in tubulogenic processes, may explain the antiangiogenic activity of S1P on brain vasculature. Altogether our results support the hypothesis of a tissue-specific, antiangiogenic role of S1P in the brain, which may help to stabilize the cerebral vasculature and thus have crucial impact on the setting and regulation of normal brain vascularization.
authors.affiliation: Laboratoire de Médecine Moléculaire, Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine-UQAM, Montreal, Quebec, Canada.
authors.forename: Anthony
authors.initials: A
authors.lastname: Pilorget
authors.forename: Borhane
authors.initials: B
authors.lastname: Annabi
authors.forename: Fatiha
authors.initials: F
authors.lastname: Bouzeghrane
authors.forename: Jacques
authors.initials: J
authors.lastname: Marvaldi
authors.forename: José
authors.initials: J
authors.lastname: Luis
authors.forename: Richard
authors.initials: R
authors.lastname: Béliveau
mesh_terms: D000818:Animals; D001792:Blood Platelets / Q000737:chemistry*; D015153:Blotting, Western; D002448:Cell Adhesion; D002454:Cell Differentiation / Q000187:drug effects; D002465:Cell Movement; D002478:Cells, Cultured; D003470:Culture Media; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D042783:Endothelial Cells / Q000187:drug effects* / Q000648:ultrastructure; D006133:Growth Substances / Q000494:pharmacology; D006801:Humans; D008246:Lysophospholipids / Q000097:blood / Q000494:pharmacology*; D020781:Matrix Metalloproteinase 1 / Q000378:metabolism; D018919:Neovascularization, Physiologic / Q000187:drug effects*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D012313:RNA / Q000096:biosynthesis / Q000302:isolation & purification; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000097:blood / Q000494:pharmacology; D014162:Transfection
chemical_list: D003470:Culture Media; D018076:DNA, Complementary; D006133:Growth Substances; D008246:Lysophospholipids; D016376:Oligonucleotides, Antisense; C060506:sphingosine 1-phosphate; D012313:RNA; D020781:Matrix Metalloproteinase 1; D013110:Sphingosine