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Target intelligence / Profile preview
Janus Kinase Family Protein Tyrosine Kinases (JAK Family)
- Target
- JAK Family
- Molecular classification
- Enzyme, Protein Tyrosine Kinase, Non-receptor Tyrosine Kinase
01
Overview
The Janus kinase (JAK) family comprises four intracellular, non-receptor tyrosine kinases: JAK1, JAK2, JAK3, and TYK2. These enzymes are essential mediators of cytokine signaling and play a central role in the JAK-STAT pathway—a key mechanism for transducing signals from extracellular cytokines to the cell nucleus to regulate gene expression. They regulate immune responses, cell growth, proliferation, differentiation, and apoptosis. Dysregulation is implicated in various cancers and autoimmune diseases, making them important therapeutic targets.
- Other names
- JAK kinasesJAK family kinasesJanus kinases
02
Mechanism of action
Inhibition of JAK kinase activity, blocking downstream STAT signaling.
03
Biological functions
Signal transductionImmune responseCell growthCell proliferationCell differentiationApoptosis
04
Disease associations
CancerAutoimmune diseasesImmunodeficiencyMyeloproliferative neoplasms
05
Safety considerations
Increased risk of infectionsThrombosisIncreased cholesterol levelsReactivation of latent infections (e.g., tuberculosis, herpes zoster)
06
Interacting drugs
JAK inhibitors
4 more in the full profile.
07
Biomarkers
JAK2 mutations (e.g., V617F) in myeloproliferative neoplasms
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