Anti-Flk-1 mAb inhibits vascularization of Matrigel plugs.

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Anti-Flk-1 mAb inhibits vascularization of Matrigel plugs. Anti-Flk-1 mAb inhibits vascularization of Matrigel plugs. C57BL/6 mice were injected s.c. at the abdominal midline with 0.5 ml of Matrigel with or without bFGF and VEGF165. Anti-Flk-1 mAb DC101 or control rat antibody was administered i.p. every 3 days starting 24 h after Matrigel injection. Matrigel plugs were removed 21 days after implantation, photographed, and prepared for histological examination or FITC-dextran uptake. A, photomicrograph of Matrigel plugs removed from mice after 21 days showing reduction in plug vascularization by anti-Flk-1 mAb treatment. B, immunohistochemical staining of sections of Matrigel plugs with anti-PECAM antibody shows reduced numbers of endothelial cells and vessel structures (arrows) in DC101-treated plugs. ×200. C, Matrigel plug vascularization was quantitated by FITC-dextran uptake into plugs as described in “Materials and Methods.” DC101 significantly (P < 0.01 at 400 μg compared to control) reduced plug vascularization as measured by FITC-dextran uptake. Columns, mean of 12 mice/group; bars, SE. Marie Prewett et al. Cancer Res 1999;59:5209-5218 ©1999 by American Association for Cancer Research