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IL-4 responsive CD4+ T cells specific for myelin basic protein: IL-2 confers a prolonged postactivation refractory
Mark D Mannie1, Dana J Fraser, Thomas J McConnell
1Department of Microbiology and Immunology, East Carolina University School of Medicine, Greenville, North Carolina 27858, USA.
Immunology and Cell Biology
|January 22, 2003
Summary
Interleukin-4 (IL-4) supports T cell line maintenance and rapid reactivation, while Interleukin-2 (IL-2) promotes sustained T cell growth and refractoriness, crucial for self-tolerance.
Area of Science:
- Immunology
- Cell Biology
Background:
- T cells play a critical role in immune responses and self-tolerance.
- Interleukins, such as IL-4 and IL-2, are key cytokines regulating T cell function.
Purpose of the Study:
- To compare the characteristics of myelin basic protein-specific T cells derived and maintained with either IL-4 or IL-2.
- To investigate the distinct roles of IL-4 and IL-2 in T cell activation, proliferation, and refractoriness.
Main Methods:
- Generation of long-term T cell lines from Lewis rats specific for myelin basic protein.
- Culturing T cells in the presence of either rat IL-4 or IL-2.
- Assessing T cell production of IL-2, responsiveness to IL-2, phenotype, and reactivity after activation.
Main Results:
- IL-4 dependent T cell lines required IL-2 for growth but rapidly returned to quiescence and regained antigen reactivity upon IL-4 exposure.
- IL-2 dependent T cell lines exhibited prolonged blastogenesis and refractoriness.
- Propagation of IL-4 dependent lines in IL-2 induced IL-2 production and prolonged refractoriness.
Conclusions:
- IL-2 acts as a dominant growth factor inducing prolonged activation-dependent non-responsiveness.
- The combination of IL-2's growth-promoting and refractoriness-inducing properties may be essential for maintaining homeostatic self-tolerance.