Stress-activated protein kinase pathway (SAPK pathway)

The stress‑activated protein kinase (SAPK) pathway refers primarily to two subfamilies within the mitogen‑activated protein kinase (MAPK) superfamily: c‑Jun N‑terminal kinases (JNK1/2/3) and p38 MAPKs (p38α/β/γ/δ). These enzymes are activated by various environmental stresses—including inflammatory cytokines, ultraviolet irradiation, heat shock, osmotic changes—and mediate cellular adaptation through phosphorylation cascades that regulate gene expression via transcription factors like c-Jun and ATF2. The SAPK pathways play critical roles in controlling apoptosis, inflammation, cell proliferation/differentiation, and tissue remodeling under pathological conditions such as cancer progression and cardiovascular injury. They have been validated as therapeutic targets; several small-molecule inhibitors have entered clinical trials for inflammatory diseases and cancer but face challenges related to specificity and safety due to their central role in essential cellular processes.

Other names

SAPK pathwayStress-activated MAPK pathwayJNK/p38 MAPK pathwaysStress response kinase cascade

Inhibition of ATP binding site on p38/JNK enzymes to block downstream phosphorylation events and cellular responses to stress/inflammation. Allosteric inhibition at novel sites exposed during conformational changes in the kinase domain.