Abstract
In addition to intravascular dissemination, angiotropic melanoma cells have the propensity to spread along the external surface of blood vessels in a pericytic location, or pericytic mimicry. Such continuous migration without intravasation has been termed "extravascular migratory metastasis" or EVMM. In order to visualize this mechanism of tumor propagation, we used a murine brain melanoma model utilizing green fluorescent human melanoma cells and red fluorescent lectin-tagged murine vessels. This model allows the direct microscopic visualization and mapping of the interaction of melanoma cells with the brain vasculature. In this chapter, we describe the methodology of lectin perfusion to label the entire angioarchitecture in conjunction with confocal microscopy imaging to study the pericyte mimicry of the angiotropic GFP+ melanoma cells.
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