Cytokines we should care about

  • Basic Introduction
    • Cytokines signal between cells and coordinate the immune response (i.e., they are the hormones of the immune system)
    • They are delivered by cells either to the systemic circulation or to the local environment
    • They bind to high affinity surface receptors
    • Produced by immune cells. But, they are also produced by non immune cells (fibroblasts, endothelial cells)
  • Classification: 4 main designation, but all basically have broad function. 
    • IL
    • Colony-stimulating factors
    • Chemokines
    • Growth Factors
  • Cytokines in normal Immunity
  • Reference:


  • Virus infected cells release IFN to fight against virus 
  • Helps activate immune cells like Macrophage and NK Cells
  • 3 Types
    • Type I
      • IFN-α
      • IFN-β
      • IFN-ε, 
      • IFN-κ and 
      • IFN-ω
    • Type II
      •  IFN-γ (gamma): Is the sole member of Type II IFN
    • Type III : IFN-λ (lambda) molecules. Consists of three of these - IFN-λ1IFN-λ2 and IFN-λ3
TNF-alpha: Amplifies T effector cell response  

How does TNF-alpha act, and can we target its down stream target  CJSAN 2015

TNF-alpha signaling cascade includes JAK pathways. Inhibition of JAK pathway (JAK1, and JAK3 by Tofacitinib led to similar efficacy as Adalimumab in RA. Ofnote, significant side effects (sepsis, neutropenia, elevated Liver enzymes, elevated Cr) were seen as it probably also lacks specificity.