Innate Immune Signaling and Interleukin-1 Kinase Regulation

The innate immune system relies on specialised receptors to detect microbial or damage-associated molecular patterns and to initiate rapid inflammatory responses. Central to this process is the interleukin-1 receptor (IL-1R) and the family of interleukin-1 receptor-associated kinases (IRAKs), which mediate signal transduction downstream of Toll-like receptors (TLRs) and IL-1R. Upon ligand binding, adaptor proteins such as MyD88 recruit IRAKs into a high-order complex known as the myddosome. Sequential autophosphorylation and protein–protein interactions within this assembly enable activation of downstream kinases, most notably the MAPK cascade and the transcription factor NF-κB. These events drive the expression of pro-inflammatory cytokines, chemokines and interferons that orchestrate local and systemic defence. Regulation of IRAK activity—through phosphorylation, ubiquitination and scaffold functions—ensures a balanced response, preventing excessive inflammation and tissue damage. Dysregulation of this pathway has been implicated in chronic inflammatory diseases, autoimmunity and cancer, making IRAKs attractive targets for therapeutic intervention.

Research from Nature Portfolio

Recent studies have revealed that IRAK1 overexpression underlies aggressive behaviour and therapy resistance in certain cancers. In triple-negative breast cancer, heightened IRAK1 activity sustains NF-κB-dependent cytokine release, fosters cancer stem-like cell enrichment and drives metastasis. Exposure to paclitaxel further amplifies IRAK1 phosphorylation, deepening chemoresistance. Pharmacological inhibition of IRAK1 not only restores drug sensitivity by triggering apoptosis through the p38-MCL1 axis, but also disrupts pro-tumour inflammatory feedback loops. This work positions IRAK1 as a dual regulator of tumour progression and a promising target for combination therapies aimed at overcoming resistance.

Innate Immune Signaling and Interleukin-1 Kinase Regulation publication trend

The graph below shows the total number of articles in innate immune signaling and interleukin-1 kinase regulation across all publications each year (not limited to Nature Index journals).

Technical terms

Innate immune signalling: A rapid defence mechanism that recognises conserved microbial or damage signals and activates inflammatory pathways.

Interleukin-1 receptor-associated kinase (IRAK): A family of serine/threonine kinases that transduce signals from IL-1R and Toll-like receptors to downstream pathways.

Myddosome: A multiprotein complex formed upon receptor activation, composed of MyD88 and IRAKs, which organises kinase activation.

NF-κB: A transcription factor that controls expression of inflammatory genes, cell survival factors and immune modulators.

MAPK (mitogen-activated protein kinase): A kinase cascade that transmits extracellular stimuli to regulate gene expression, cell proliferation and apoptosis.

Autophosphorylation: The process by which a kinase phosphorylates itself to achieve full enzymatic activation.

References

1. Interleukin-1 receptor–associated kinase 4 (IRAK4) plays a dual role in myddosome formation and Toll-like receptor signaling. Journal of Biological Chemistry (2018).
2. Sequential Autophosphorylation Steps in the Interleukin-1 Receptor-associated Kinase-1 Regulate its Availability as an Adapter in Interleukin-1 Signaling*. Journal of Biological Chemistry (2003).
3. IRAK1 is a therapeutic target that drives breast cancer metastasis and resistance to paclitaxel. Nature Communications (2015).
4. Discovery of IRAK4 Inhibitors BAY1834845 (Zabedosertib) and BAY1830839. Journal of Medicinal Chemistry (2024).
5. Radiation induces IRAK1 expression to promote radioresistance by suppressing autophagic cell death via decreasing the ubiquitination of PRDX1 in glioma cells. Cell Death & Disease (2023).