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Lanlan Yu, Xiumin Wu, Zhiyong Cheng, Chingwei V. Lee, Jennifer LeCouter, Claudio Campa, Germaine Fuh, Henry Lowman, Napoleone Ferrara; Interaction between Bevacizumab and Murine VEGF-A: A Reassessment. Invest. Ophthalmol. Vis. Sci. 2008;49(2):522-527. doi: 10.1167/iovs.07-1175.
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purpose. Bevacizumab is a humanized anti-human VEGF-A monoclonal antibody (mAb) approved by the United States Food and Drug Administration for cancer therapy and used off label to treat neovascular age-related macular degeneration. Earlier studies characterized bevacizumab as species specific and lacking the ability to neutralize murine (m) VEGF-A. However, a recent study reported that bevacizumab is a potent inhibitor of hemangiogenesis and lymphangiogenesis in murine models. The authors sought to reassess the interaction between bevacizumab and mVEGF-A.
methods. The authors performed Western blot analysis, plasmon resonance by BIAcore, and endothelial cell proliferation assays to characterize the interaction between bevacizumab and mVEGF-A. They also tested whether bevacizumab had any effects in two in vivo murine models, laser-induced choroidal neovascularization (CNV) and melanoma growth.
results. Western blot detected a very weak interaction, but BIAcore detected no measurable interaction between mVEGF and bevacizumab. Bevacizumab failed to inhibit mVEGF-stimulated endothelial cell proliferation. In addition, bevacizumab was indistinguishable from the control antibody in the CNV and tumor models, whereas a cross-reactive anti–VEGF-A mAb had dramatic inhibitory effects.
conclusions. Bevacizumab has an extremely weak interaction with mVEGF-A, which fails to result in immunoneutralization as assessed by several bioassays.
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