Reactive oxygen species mediate microRNA-302 regulation of AT-rich interacting domain 4a and C-C motif ligand 5 expression during transitions between quiescence and proliferation

► miR-302 levels decrease in quiescence and ionizing radiation-induced growth arrest. ► miR-302 is a ROS-sensitive regulator of ARID4a and CCL5 mRNAs. ► Overexpression of miR-302 increased the percentage of S-phase cells.