FIGURE 11.

EV-mediated extracellular co-emission of EGFR and DNA following cancer cell exposure to EKIs. A, experimental design: ImmunoCapture of pre-filtered, EGFR-containing EVs produced by A431 cells either in the absence of in the presence of EKIs, followed by detection of extracellular genomic DNA (exo-gDNA; PCR). B, analysis of EGFR genomic sequences in EV fractions captured on plates coated with anti-EGFR antibody. This assay reveals that the same population of small EGFR-positive exosome-like EVs, which are able to pass through both 0.8- and 0.45-μm filters, is enriched in exo-gDNA, but only if the cells were pretreated with growth inhibitory doses of EKIs, CI-1033 or PF-00299804 (see text for details). UC, ultracentrifugation; -, possible but not obligatory step in the procedure.