Mitogen-activated protein kinases (MAPKs) are serine-threonine protein kinases that play a key role in signal transduction from the cell surface to the nucleus. MAPKs include extracellular signal-regulated kinases (ERKs), c-jun N-terminal kinases (JNKs), and p38 MAPKs, which are regulated by a three-kinase signaling module involving MAPK, MAP2K, and MAP3K. MAPK phosphatases (MKPs) dephosphorylate and inactivate MAPKs. ROS can activate MAPK pathways through oxidative modifications of signaling proteins and inactivation/degradation of MKPs. ROS, such as hydrogen peroxide, can induce MAPK activation by modifying critical amino acid residues of proteins, leading to activation of ERK, JNK, or p38 pathways. Additionally, ROS can activate MAPK pathways by inhibiting or degrading MKPs, which are responsible for dephosphorylating MAPKs. The activation of MAPK pathways by ROS is a complex process involving multiple mechanisms, including oxidative modifications of signaling proteins and regulation of MKPs. ROS can also activate MAPK pathways through the oxidation of growth factor receptors, leading to their phosphorylation and subsequent activation of MAPK pathways. The role of ROS in MAPK activation is significant in various cellular processes, including cell survival, death, and disease. Understanding the mechanisms by which ROS activate MAPK pathways is crucial for developing therapeutic strategies targeting these pathways in diseases associated with oxidative stress.Mitogen-activated protein kinases (MAPKs) are serine-threonine protein kinases that play a key role in signal transduction from the cell surface to the nucleus. MAPKs include extracellular signal-regulated kinases (ERKs), c-jun N-terminal kinases (JNKs), and p38 MAPKs, which are regulated by a three-kinase signaling module involving MAPK, MAP2K, and MAP3K. MAPK phosphatases (MKPs) dephosphorylate and inactivate MAPKs. ROS can activate MAPK pathways through oxidative modifications of signaling proteins and inactivation/degradation of MKPs. ROS, such as hydrogen peroxide, can induce MAPK activation by modifying critical amino acid residues of proteins, leading to activation of ERK, JNK, or p38 pathways. Additionally, ROS can activate MAPK pathways by inhibiting or degrading MKPs, which are responsible for dephosphorylating MAPKs. The activation of MAPK pathways by ROS is a complex process involving multiple mechanisms, including oxidative modifications of signaling proteins and regulation of MKPs. ROS can also activate MAPK pathways through the oxidation of growth factor receptors, leading to their phosphorylation and subsequent activation of MAPK pathways. The role of ROS in MAPK activation is significant in various cellular processes, including cell survival, death, and disease. Understanding the mechanisms by which ROS activate MAPK pathways is crucial for developing therapeutic strategies targeting these pathways in diseases associated with oxidative stress.