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Interleukin-2 induces apoptosis in mouse thymocytes
G Migliorati1, I Nicoletti, M C Pagliacci
1Istituto di Farmacologia Medica, Perugia University Medical School, Italy.
Cellular Immunology
|January 1, 1993
Summary
High concentrations of Interleukin-2 (IL-2) can trigger programmed cell death (apoptosis) in mouse thymocytes. This process involves DNA fragmentation and requires active gene and protein synthesis, suggesting a novel IL-2 function in T-cell development.
Area of Science:
- Immunology
- Cell Biology
Background:
- Interleukins, including Interleukin-2 (IL-2), are key regulators of T-cell development.
- Cytokines, such as IL-2, can influence programmed cell death (apoptosis).
- Previous studies indicated IL-2 inhibits thymocyte apoptosis induced by T-cell receptor activation or glucocorticoids.
Purpose of the Study:
- To investigate the effect of IL-2 on mouse thymocyte apoptosis.
- To determine if IL-2 can induce cell death in thymocytes via an endogenous pathway.
Main Methods:
- Incubation of CD4+ CD8+ mouse thymocytes with high concentrations of IL-2 in vitro.
- Morphological analysis of apoptotic cells, including nuclear size and chromatin structure.
- Assessment of DNA fragmentation.
- Inhibition studies using mRNA/protein synthesis inhibitors, a PKC inhibitor (H-7), Zn2+ ions, and IL-4.
Main Results:
- High IL-2 concentrations induced morphological features of apoptosis in thymocytes.
- Observed DNA fragmentation into oligonucleosomal subunits.
- Cell death was counteracted by inhibiting mRNA and protein synthesis.
- The PKC-inhibitor H-7, Zn2+ ions, and IL-4 also inhibited the IL-2-induced cell death.
Conclusions:
- High IL-2 concentrations can actively induce apoptosis in mouse thymocytes.
- This IL-2-mediated cell death is an active, endogenous process requiring gene and protein synthesis.
- These findings suggest a complex role for IL-2 in T-cell development, potentially involving the elimination of certain thymocyte populations.