Extracellular signal-regulated kinase 1 and p38 mitogen-activated protein kinase pathway (ERK1/p38 MAPK)

The ERK1/p38 MAPK pathway represents a critical signaling axis composed of two distinct mitogen-activated protein kinase (MAPK) sub-families that regulate diverse cellular processes. The Extracellular signal-regulated kinase 1 (ERK1) branch is primarily activated by growth factors and is a central mediator of cell proliferation, differentiation, and survival [1][3]. In contrast, the p38 MAPK branch is predominantly activated by environmental stressors and inflammatory cytokines, playing a pivotal role in the stress response, apoptosis, and the production of inflammatory mediators [2][3]. Dysregulation of these pathways is implicated in a wide range of diseases, including various cancers where ERK signaling is often constitutively active, and chronic inflammatory or neurodegenerative conditions driven by aberrant p38 activity [3]. Pharmacological intervention typically involves small-molecule inhibitors designed to block the catalytic activity of these kinases, thereby interrupting the transmission of pathological signals [4]. Despite their therapeutic potential, targeting these pathways is complicated by the high degree of crosstalk between MAPK cascades and the risk of systemic toxicity due to the essential roles these proteins play in normal physiology.

Other names

MAPK signaling pathwayMitogen-activated protein kinase pathwayERK/p38 signaling

Small-molecule inhibition of kinase activity through ATP-competitive or allosteric binding, preventing the phosphorylation of downstream substrates.