Molecular markers

JAK2



Last author update: 1 June 2005
Last staff update: 24 October 2022

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PubMed Search: JAK2

Nat Pernick, M.D.
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Cite this page: Pernick N. JAK2. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/stainsjak.html. Accessed March 22nd, 2023.
Definition / general
  • Family whose members (JAK1-3, Tyk2) are critical for cytokine signaling
  • Associated with intracytoplasmic portion of cytokine receptors, which serves as docking site for STAT monomers; activated JAK activates and phosphorylates the STAT monomers, which then dissociate, dimerize and migrate to nuclear, where they interact with specific DNA binding elements and activate transcription of cyclin D1, bcl-Xl, bax, bcl2, c-myc, c-Jun, c-kit, and IL-10
  • Jak3: Janus kinase 3, a tyrosine kinase that activates STAT3 in response to cytokine stimulation
  • Positive staining (disease): ALK+ anaplastic large cell lymphoma (Hum Pathol 2005;36:939)
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