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Interleukin-2 (IL-2) upregulates BAG-1 gene expression through serine-rich region within IL-2 receptor beta c chain

M Adachi1, M Sekiya, T Torigoe

  • 1First Department of Internal Medicine, Sapporo Medical University School of Medicine, Japan.

Blood
|December 1, 1996
PubMed

Insights

Interleukin-2 (IL-2) upregulates the anti-apoptotic protein BAG-1 in hematopoietic cells. This IL-2-mediated induction requires the IL-2 receptor beta c chain

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Biology

Background:

  • BAG-1 (Bcl-2-associated gene 1) is a key protein involved in preventing programmed cell death (apoptosis).
  • Interleukin-2 (IL-2) is a cytokine crucial for immune cell proliferation and survival.

Purpose of the Study:

  • To investigate the mechanism of IL-2-mediated upregulation of BAG-1 expression.
  • To elucidate the signaling pathway involved in IL-2-induced BAG-1 gene expression and its role in cell survival.

Main Methods:

  • Utilized hematopoietic cell line BAF-B03 F7 cells engineered to express the IL-2 receptor beta c chain.
  • Analyzed BAG-1 mRNA induction by IL-2 using gene transfer and mutant receptor/kinase constructs.
  • Investigated the role of tyrosine kinases, rapamycin sensitivity, and Janus kinase 3 (Jak3) in the signaling pathway.

Main Results:

  • IL-2 dramatically induced BAG-1 mRNA expression in cells expressing the IL-2 receptor beta c chain.
  • The induction required tyrosine kinase activation and was rapamycin-sensitive, similar to bcl-2 induction.
  • A serine-rich region within the IL-2 receptor beta c chain was essential for IL-2-mediated BAG-1 gene expression and apoptosis suppression, while Jak3 activation was dispensable.

Conclusions:

  • The signaling pathway for IL-2-induced BAG-1 expression closely resembles that of bcl-2, suggesting a shared pathway.
  • The serine-rich region of the IL-2 receptor beta c chain mediates coordinated expression of BAG-1 and bcl-2.
  • This coordinated gene expression contributes significantly to IL-2's anti-apoptotic effects.

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