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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ruggeri, Zaverio M. Ware, Jerry Folkman, Judah Wagner, Denisa D. Saffaripour, Simin Butterfield, Catherine E. Eichenberger, Sarah C. Duda, Dan G. Kisucka, Janka Jain, Rakesh K. |
| Description | Author Affiliation: Kisucka J ( CBR Institute for Biomedical Research, Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.); |
| Abstract | Platelets contain both pro- and antiangiogenic factors, but their regulatory role in angiogenesis is poorly understood. Although previous studies showed that platelets stimulate angiogenesis in vitro, the role of platelets in angiogenesis in vivo is largely uncharacterized. To address this topic, we used two in vivo approaches, the cornea micropocket assay and the Matrigel model, in four animal models: thrombocytopenic, Lyst(bg) (platelet storage pool deficiency), glycoprotein (GP) Ibalpha/IL4R transgenic (lacking extracellular GPIbalpha, the receptor for von Willebrand factor as well as other adhesive and procoagulant proteins), and FcgammaR(-/-) (lacking functional GPVI, the collagen receptor) mice. Adult mice were rendered thrombocytopenic by i.p. administration of an antiplatelet antibody. The number of growing vessels in the thrombocytopenic mice was lower in the cornea assay, and they showed significantly increased appearance of hemorrhage compared with mice treated with control IgG. The thrombocytopenic mice also showed more protein leakage and developed hematomas in the Matrigel model. GPIbalpha/IL4R transgenic mice presented increased hemorrhage in both assays, but it was less severe than in the platelet-depleted mice. FcgammaR(-/-) and Lyst(bg) mice showed no defect in experimental angiogenesis. Intravital microscopy revealed a >3-fold increase in platelet adhesion to angiogenic vessels of Matrigel compared with mature quiescent skin vessels. Our results suggest that the presence of platelets not only stimulates angiogenic vessel growth but also plays a critical role in preventing hemorrhage from the angiogenic vessels. The adhesion function of platelets, as mediated by GPIbalpha, significantly contributes to the process. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 103 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2006-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Blood Platelets Cytology Hemorrhage Prevention & Control Platelet Adhesiveness Animals Metabolism Cell Adhesion Collagen Chemistry Cornea Drug Combinations Fibroblast Growth Factors Glycoproteins Hemoglobins Laminin Mice Mice, Inbred C57BL Mice, Transgenic Models, Statistical Neovascularization, Pathologic Proteoglycans Thrombocytopenia Time Factors Transgenes Von Willebrand Factor Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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