A DNA vaccine targeting angiomotin inhibits angiogenesis and suppresses tumor growth |
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Authors: | Holmgren Lars Ambrosino Elena Birot Olivier Tullus Carl Veitonmäki Niina Levchenko Tetyana Carlson Lena-Maria Musiani Piero Iezzi Manuela Curcio Claudia Forni Guido Cavallo Federica Kiessling Rolf |
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Affiliation: | Department of Oncology and Pathology, Cancer Centre Karolinska, Karolinska Institutet, SE171 76 Stockholm, Sweden. |
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Abstract: | Endogenous angiogenesis inhibitors have shown promise in preclinical trials, but clinical use has been hindered by low half-life in circulation and high production costs. Here, we describe a strategy that targets the angiostatin receptor angiomotin (Amot) by DNA vaccination. The vaccination procedure generated antibodies that detected Amot on the endothelial cell surface. Purified Ig bound to the endothelial cell membrane and inhibited endothelial cell migration. In vivo, DNA vaccination blocked angiogenesis in the matrigel plug assay and prevented growth of transplanted tumors for up to 150 days. We further demonstrate that a combination of DNA vaccines encoding Amot and the extracellular and transmembrane domains of the human EGF receptor 2 (Her-2)/neu oncogene inhibited breast cancer progression and impaired tumor vascularization in Her-2/neu transgenic mice. No toxicity or impairment of normal blood vessels could be detected. This work shows that DNA vaccination targeting Amot may be used to mimic the effect of angiostatin. |
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