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Immunobiology of interleukin-12
1Wistar Institute of Anatomy and Biology, Philadelphia, PA 19104, USA. trinchieri@wista.wistar.upenn.edu
Immunologic Research
|February 28, 1998
Summary
Interleukin-12 (IL12) is a proinflammatory cytokine that activates immune cells like NK cells and promotes T helper type 1 (Th1) responses. It is crucial for early infection control and orchestrating adaptive immunity against intracellular pathogens.
Area of Science:
- Immunology
- Cell Biology
- Infectious Disease
Background:
- Interleukin-12 (IL12) is a cytokine produced by immune cells upon infection.
- It plays a role in inflammation and immune cell activation.
Purpose of the Study:
- To elucidate the role of IL12 in early immune responses.
- To understand IL12's function in regulating T helper cell differentiation.
Main Methods:
- Analysis of cytokine production by phagocytic and antigen-presenting cells.
- Assessment of immune cell activation, including NK cells and T cells.
- Evaluation of T helper type 1 (Th1) and T helper type 2 (Th2) cell differentiation.
Main Results:
- IL12 production is rapid, occurring within hours of infection, particularly against bacteria and intracellular parasites.
- IL12 activates natural killer (NK) cells and enhances phagocytic cell activity via interferon-gamma (IFN-γ) induction.
- IL12 promotes Th1 cell differentiation while inhibiting Th2 cell differentiation, shaping the adaptive immune response.
Conclusions:
- IL12 is a potent proinflammatory cytokine essential for early host defense.
- IL12 acts as a key immunoregulator, directing the immune system towards a Th1-biased response.
- This cytokine is critical for controlling intracellular infections and establishing effective adaptive immunity.