Abstract
Since many tumors are associated with a pronounced collagen-rich stromal reaction, there is increasing interest in understanding mechanisms by which cancer cells invade through the collagen barrier. Here we describe a quantitative method to track cell invasion in 3D collagen I gels. We analyze invasion by quantifying proteolytic tracks generated by invading cancer cells through a 3D collagen microenvironment. We provide a detailed protocol for this quantitative assay, which can be used to characterize signaling pathways that regulate invasion in the 3D microenvironment.
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