Summary
Previous studies have revealed that, at the initial step of carcinogenesis, transformed cells are often eliminated from epithelia via cell competition with the surrounding normal cells. In this study, we performed cell competition-based high-throughput screening for chemical compounds using cultured epithelial cells and confocal microscopy. PLX4720 was identified as a hit compound that promoted apical extrusion of RasV12-transformed cells surrounded by normal epithelial cells. Knockdown/knockout of ZAK, a target of PLX4720, substantially enhanced the apical elimination of RasV12 cells
in vitro
and
in vivo
. ZAK negatively modulated the accumulation or activation of multiple cell competition regulators. Moreover, PLX4720 treatment promoted apical elimination of RasV12-transformed cells
in vivo
and suppressed the formation of potentially precancerous tumors. This is the first report demonstrating that a cell competition-promoting chemical drug facilitates apical elimination of transformed cells
in vivo
, providing a new dimension in cancer preventive medicine.
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