Tyrosine Kinase Signaling in Cytokine Pathways

Tyrosine kinase signalling underpins the cellular response to a myriad of cytokines that regulate immunity, haematopoiesis and tissue homeostasis. Engagement of a cytokine with its cognate receptor induces conformational changes and often receptor dimerisation or higher‐order oligomerisation. This juxtaposition brings associated cytoplasmic tyrosine kinases, principally members of the Janus kinase (JAK) family, into proximity, where they engage in reciprocal trans‐phosphorylation. Activated JAKs phosphorylate specific tyrosine residues within receptor intracellular domains, creating docking sites for downstream effectors such as signal transducers and activators of transcription (STATs). Phosphorylated STATs dimerise and translocate to the nucleus to initiate context‐dependent gene programmes. Fine tuning of this cascade is achieved by negative regulators including suppressors of cytokine signalling (SOCS), protein tyrosine phosphatases and regulatory adaptor proteins. Beyond the core JAK–STAT axis, cross‐talk with mitogen-activated protein kinase, phosphatidylinositol 3-kinase/Akt and nuclear factor-κB pathways expands the scope of biological outcomes. Aberrant tyrosine kinase signalling in cytokine pathways contributes to immunodeficiency, chronic inflammation and oncogenesis, and small-molecule inhibitors targeting JAKs have emerged as transformative therapies in autoimmune disease and haematological malignancies.

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Tyrosine Kinase Signaling in Cytokine Pathways publication trend

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Technical terms

Tyrosine kinase: Enzyme that transfers a phosphate group to specific tyrosine residues on substrate proteins.

Cytokine receptor: Transmembrane protein that binds cytokines and associates with intracellular kinases to initiate signalling.

Janus kinase (JAK): Family of non-receptor tyrosine kinases that associate with cytokine receptors and mediate signal transduction via phosphorylation.

Signal transducer and activator of transcription (STAT): Latent transcription factors activated by receptor-associated tyrosine kinases that regulate gene expression.

Dimerisation: The process by which two protein subunits associate, often triggering activation of receptor-linked kinases.

References

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3. Interferon α/β Promotes Cell Survival by Activating Nuclear Factor κB through Phosphatidylinositol 3-Kinase and Akt*. Journal of Biological Chemistry (2001).