Mitogen-activated protein kinase p38 (p38 MAPK)

Mitogen-activated protein kinase p38 (p38 MAPK) is a family of serine/threonine kinases involved in transducing extracellular stress and inflammatory signals into multiple cellular responses, including inflammation, cell cycle control, apoptosis, and differentiation[1][2][4][6][7]. There are four main isoforms in mammals—p38α, p38β, p38γ, and p38δ—each with partly distinct tissue distributions and functions[1][7][10]. Activation occurs via phosphorylation in response to environmental stresses (cytokines, UV irradiation, heat shock, endotoxins), mediating key events such as cytokine production and immune cell recruitment[1][2][8][10]. p38 MAPK is a well-validated therapeutic target, especially in inflammatory diseases, cancer, neurodegeneration, and cardiovascular conditions[7][4][3]. Pharmacological inhibition of p38 MAPK leads to suppression of pro-inflammatory cytokines and modulation of cell survival or death, but therapeutic use is limited by compensatory pathways and safety concerns including immunosuppression and liver toxicity[7][4][8]. The pathway acts as a signal integration platform, closely interacting with other MAPKs (ERK, JNK), and plays roles in both normal physiology and disease pathology, notably in inflammation and cell fate decisions[4][2][6][7].

Other names

p38 MAP kinasep38 MAPKRKCSBP (Cytokinin Specific Binding Protein)MAPK14 (p38α)MAPK11 (p38β)MAPK12 / ERK6 (p38γ)MAPK13 / SAPK4 (p38δ)Stress-activated protein kinase (SAPK) 2p38α, p38β, p38γ, p38δ

Inhibition of kinase activity (ATP-competitive inhibition) - Downregulation of pro-inflammatory cytokine production (e.g., TNF-α, IL-1, IL-6) - Modulation of transcription factors (e.g., ATF2, MEF2, p53 phosphorylation) - Prevention of phosphorylation of downstream kinases such as MAPKAP kinase 2