Abstract: Reactive oxygen species ( ROS ) are byproduct of vivo aerobic cells in the metabolic process , including O2 - 、H2O2 、 ? OH and HO2- . Existing studies have shown that when the balance of ROS generation and clear broken , then ROS through damage mitochondria 、activate the death receptor , affect the expression of cytokines and activate the transcription factor , to participate and influence the cell signal transduction mechanisms , which has a crucial regulatory for the cell apoptosis and proliferation.

Key words: ROS, Cell apoptosis, Proliferation