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Departments of Pathology [B. K., W. P. J. L., P. W., K. V., D. J. R., R. M. W. d. W.], Central Animal Laboratory [D. S.], and Radiotherapy [J. P. W. P., A. J. v. d. K.], University Medical Centre Nijmegen, 6500 HB Nijmegen, the Netherlands
We investigated the mechanisms of vascularization in a brain metastases model of malignant melanoma. Parenchymal metastases expressing little vascular endothelial growth factor-A (VEGF-A) co-opted the preexistent brain vasculature, leading to an infiltrative phenotype. Metastases of the human melanoma cell line Mel57, engineered to express recombinant VEGF-A165, showed accelerated growth in a combined expansive and infiltrative pattern with marked central necrosis. This difference in growth profile was accompanied by dilation of co-opted intra- and peritumoral vessels with concomitant induction of vascular permeability. Our data show that modulation of preexistent vasculature can contribute to malignant progression without induction of sprouting angiogenesis.
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