title: Antiphospholipid antibodies affect human endometrial angiogenesis.
abstract: Antiphospholipid antibodies (aPL) represent an important risk factor for thrombosis and recurrent miscarriage in patients with antiphospholipid syndrome (APS). The mechanisms of aPL-mediated pregnancy failure have been researched. Previous studies demonstrated that aPL bind trophoblast cells, reducing proliferation, human chorionic gonadotrophin release, and in vitro invasiveness. Recent data suggest that aPL are also able to react with human decidual cells, inducing a proinflammatory phenotype. Decidua, a newly formed tissue on the maternal side of the human placenta, is characterized by active angiogenesis and structural modifications of the spiral arteries in early pregnancy. Since angiogenesis is a critical component of normal placentation, the purpose of our study was to evaluate the role of aPL on human endometrial angiogenesis. For this reason, we investigated the effect of aPL on in vitro endometrial endothelial cell (HEEC) angiogenesis, VEGF secretion by ELISA, matrix metalloproteinases (MMPs) activity by gelatin zymography, and DNA binding activity of NFKB by a sensitive multiwell colorimetric assay. Furthermore, we performed experiments to study whether aPL affects in vivo angiogenesis in a murine model. We found that aPL significantly decrease the number and the total length of the tubules formed by HEEC on in vitro Matrigel assay and reduce newly formed vessels in aPL-inoculated mice. Moreover, aPL reduce significantly both VEGF and MMPs production and, at the nuclear level, NFKB DNA binding activity. From our results, it appears that aPL are associated with an inhibition of angiogenesis, suggesting further additional mechanisms to explain the defective placentation in the APS.
authors.affiliation: Department of Obstetrics and Gynecology, Catholic University of Sacred Heart, Rome, Italy. nicolettadisimone@rm.unicatt.it
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Di Simone
authors.forename: Fiorella
authors.initials: F
authors.lastname: Di Nicuolo
authors.forename: Silvia
authors.initials: S
authors.lastname: D'Ippolito
authors.forename: Roberta
authors.initials: R
authors.lastname: Castellani
authors.forename: Chiara
authors.initials: C
authors.lastname: Tersigni
authors.forename: Alessandro
authors.initials: A
authors.lastname: Caruso
authors.forename: Pierluigi
authors.initials: P
authors.lastname: Meroni
authors.forename: Riccardo
authors.initials: R
authors.lastname: Marana
mesh_terms: D000026:Abortion, Habitual / Q000209:etiology; D000328:Adult; D000818:Animals; D017152:Antibodies, Antiphospholipid / Q000378:metabolism / Q000494:pharmacology*; D016736:Antiphospholipid Syndrome / Q000150:complications; D002478:Cells, Cultured; D004247:DNA / Q000378:metabolism; D004717:Endometrium / Q000098:blood supply* / Q000276:immunology / Q000378:metabolism; D042783:Endothelial Cells / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D061965:Matrix Metalloproteinase Inhibitors; D020782:Matrix Metalloproteinases / Q000378:metabolism; D051379:Mice; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000378:metabolism; D018919:Neovascularization, Physiologic / Q000187:drug effects / Q000502:physiology*; D011247:Pregnancy; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
chemical_list: D017152:Antibodies, Antiphospholipid; D061965:Matrix Metalloproteinase Inhibitors; D016328:NF-kappa B; D042461:Vascular Endothelial Growth Factor A; D004247:DNA; D020782:Matrix Metalloproteinases