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• W2020758879 abstract "The large secreted glycoprotein thrombospondin-1 is a potent inhibitor of neovascularizationin vivo.In order to better understand its mechanism of action, we have determined the full range of deficits thrombospondin can impose on cultured capillary endothelial cells. Exogenously added thrombospondin-1 blocked the ability of these cells to organize into cords. It blocked the migration of endothelial cells and vascular smooth muscle cells, but not that of fibroblasts, neutrophils, or keratinocytes, demonstrating specificity. Conversely, when the endogenous thrombospondin-1 produced by the endothelial cells was inactivated using antibodies that can neutralize its inhibition of neovascularizationin vivo,migration toward basic fibroblast growth factor and cord formation were stimulated, and sparsely plated cells developed cylindrical cavities. These cavities formed by vesicle fusion, extended the depth of the cell, and appeared to be incipient lumens, staining positively for the luminal marker angiotensin converting enzyme. Antiangiogenic levels of thrombospondin-1 had no measurable effect on the overall level of activity of soluble gelatinases or on urokinase plasminogen activator produced by activated endothelial cells. Coupled with previously published data, these results demonstrate thrombospondin-1 is a multifaceted inhibitor able to block the entire program of dedifferentiation and redifferentiation essential to the formation of new vessels. They also support the contention that the endogenously produced protein contributes to the quiescence of the normal vasculature." @default.
• W2020758879 created "2016-06-24" @default.
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• W2020758879 date "1997-07-01" @default.
• W2020758879 modified "2023-10-16" @default.
• W2020758879 title "Lumen Formation and Other Angiogenic Activities of Cultured Capillary Endothelial Cells Are Inhibited by Thrombospondin-1" @default.
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• W2020758879 doi "https://doi.org/10.1006/mvre.1997.2015" @default.
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