PCa cells were plated in Hi-Q4 glass-bottom dishes (Ibidi) and cultured in RPMI-1640 containing 10% FBS. Cells were washed with RPMI-1640 containing 0.1% FBS before the addition of Calvarial-CM or recombinant human proteins. Concentrations used for the various recombinant human proteins were empirically derived. Images (20X objective) were acquired every 20 min for 72 h in a BioStation (Nikon) as previously described3 (link). Data were compiled using NIS-Elements (Nikon) software.
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