ASK1-MAPK Signaling Pathways in Cellular Stress Responses

The apoptosis signal-regulating kinase 1 (ASK1) acts as a pivotal sensor and transmitter of diverse cellular stresses, including oxidative imbalance, endoplasmic reticulum perturbation and proinflammatory cues. Upon activation by stress-induced dissociation from inhibitory partners such as thioredoxin and 14-3-3 proteins, ASK1 undergoes oligomerisation and autophosphorylation, forming a high-molecular-mass signalosome that recruits downstream components. This complex propagates signals through the mitogen-activated protein kinase (MAPK) cascades, chiefly the c-Jun N-terminal kinase (JNK) and p38 pathways, orchestrating transcriptional programmes that govern apoptosis, cytokine production and adaptive responses. Transient activation of ASK1-MAPK axes contributes to repair and survival, whereas sustained signalling predisposes to inflammatory pathology, fibrosis and cell death in organs ranging from myocardium to brain. Emerging structural insights into the kinase domain and regulatory interfaces have offered a clearer picture of autoinhibition and activation mechanisms. Collectively, the ASK1-MAPK network represents both a fundamental model of stress signalling and a promising target for therapeutic modulation across multiple disease contexts.

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ASK1-MAPK Signaling Pathways in Cellular Stress Responses publication trend

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Technical terms

ASK1 (Apoptosis Signal-Regulating Kinase 1): A serine/threonine kinase that senses cellular stress and activates downstream MAPK cascades.

MAPK (Mitogen-Activated Protein Kinase): A family of kinases transmitting extracellular or intracellular signals to elicit cellular responses such as gene expression or apoptosis.

JNK (c-Jun N-Terminal Kinase): A MAPK subgroup activated by stress that regulates transcription factors and apoptotic machinery.

p38 MAPK: A subgroup of stress-activated MAPKs involved in inflammation, cell cycle control and differentiation.

Signalosome: A multi-protein complex that assembles upon ASK1 activation to facilitate kinase activation and substrate recruitment.

References

1. The roles of ASK family proteins in stress responses and diseases. Cell Communication and Signaling (2009).
2. Activation of Apoptosis Signal-regulating Kinase 1 by Reactive Oxygen Species through Dephosphorylation at Serine 967 and 14-3-3 Dissociation*. Journal of Biological Chemistry (2003).
3. Biophysical and Structural Characterization of the Thioredoxin-binding Domain of Protein Kinase ASK1 and Its Interaction with Reduced Thioredoxin*. Journal of Biological Chemistry (2014).
4. Structural Insight into the 14-3-3 Protein-dependent Inhibition of Protein Kinase ASK1 (Apoptosis Signal-regulating kinase 1)*. Journal of Biological Chemistry (2016).
5. Structural and Functional Characterization of the Human Protein Kinase ASK1. Structure (2007).
6. Recruitment of Tumor Necrosis Factor Receptor-associated Factor Family Proteins to Apoptosis Signal-regulating Kinase 1 Signalosome Is Essential for Oxidative Stress-induced Cell Death*. Journal of Biological Chemistry (2005).
7. Inhibition of Apoptosis Signal–Regulating Kinase 1 Reduces Myocardial Ischemia–Reperfusion Injury in the Mouse. Journal of the American Heart Association (2012).
8. The Function of ASK1 in Sepsis and Stress-Induced Disorders. International Journal of Molecular Sciences (2023).
9. ASK1 inhibition: a therapeutic strategy with multi-system benefits. Journal of Molecular Medicine (2020).