Apoptosis signal-regulating kinase 1-Mitogen-activated protein kinase kinase 3-p38 mitogen-activated protein kinase signaling pathway (ASK1-MKK3-p38 MAPK pathway)

The ASK1-MKK3-p38 MAPK signaling pathway is a critical stress-responsive kinase cascade that regulates cellular responses to oxidative stress, endoplasmic reticulum (ER) stress, and inflammatory cytokines (1.1.3, 1.2.1). The pathway is initiated by the activation of Apoptosis signal-regulating kinase 1 (ASK1), which subsequently phosphorylates and activates Mitogen-activated protein kinase kinase 3 (MKK3), leading to the activation of p38 mitogen-activated protein kinase (p38 MAPK) (1.1.1, 1.3.2). This signaling axis plays a pivotal role in promoting apoptosis, inflammation, and fibrotic responses, making it a significant driver in the pathogenesis of various diseases, including cardiovascular disorders, neurodegenerative diseases, and chronic inflammatory conditions (1.2.1, 1.2.3). In cancer, the pathway's role is complex, often acting as a tumor suppressor in early stages but potentially promoting survival and chemoresistance in advanced malignancies (1.1.2, 1.2.5). Therapeutic strategies targeting this pathway primarily involve small-molecule inhibitors of ASK1 or p38 MAPK to mitigate pathological inflammation and cell death (1.1.3, 1.3.2). However, clinical development has faced challenges such as off-target toxicities and the pleiotropic nature of p38 signaling (1.1.1, 1.1.3).

Other names

ASK1-p38 axisASK1-MKK3/6-p38 signaling axisStress-activated protein kinase (SAPK) pathwayASK1-signalosomeMAP3K5-MAP2K3-MAPK14 pathway

Inhibition of the phosphorylation cascade within the ASK1-MKK3-p38 axis to prevent the activation of downstream pro-inflammatory and pro-apoptotic effectors.