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IL-6 rescues resting mouse T cells from apoptosis
T K Teague1, P Marrack, J W Kappler
1Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|June 15, 1997
Summary
Interleukin-6 (IL-6) prevents premature death of T cells in laboratory cultures. This cytokine maintains T cell survival by preserving Bcl-2 expression, acting as a crucial survival factor.
Area of Science:
- Immunology
- Cell Biology
Background:
- Mature T cells survive for weeks in vivo but die within days in culture.
- This suggests essential survival factors present in vivo are absent in standard culture media.
Purpose of the Study:
- To investigate the role of Interleukin-6 (IL-6) in T cell survival.
- To determine if IL-6 can prevent apoptosis in cultured T cells.
Main Methods:
- Assessing T cell survival in vitro with and without recombinant IL-6.
- Analyzing Bcl-2 protein expression in T cells using flow cytometry.
- Evaluating the effect of IL-6 on T cell proliferation.
Main Results:
- Recombinant IL-6 and IL-6 from endothelial cells rescued T cells from apoptosis in vitro.
- IL-6 prevented the downregulation of Bcl-2 expression in T cells cultured for 24 hours.
- IL-6 did not induce T cell blastogenesis or proliferation, confirming it as a survival factor.
Conclusions:
- IL-6 is a significant survival factor for resting T cells in vitro.
- IL-6 may prolong T cell survival in vivo, potentially by maintaining Bcl-2 expression.