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CD28-Mediated regulation of mRNA stability requires sequences within the coding region of the IL-2 mRNA

J A Ragheb1, M Deen, R H Schwartz

  • 1Laboratory of Cellular and Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|June 29, 1999
PubMed

Insights

CD28 signaling transiently stabilizes Interleukin-2 (IL-2) mRNA after T cell activation, requiring specific exon sequences. Later CD28 signaling unexpectedly enhances IL-2 mRNA decay via distinct coding region elements.

Area of Science:

  • Immunology
  • Molecular Biology
  • Gene Regulation

Background:

  • Interleukin-2 (IL-2) is crucial for T cell function and proliferation.
  • CD28 is a key co-stimulatory receptor on T cells, influencing immune responses.
  • Regulation of IL-2 mRNA stability is critical for controlling T cell activation and cytokine production.

Purpose of the Study:

  • To investigate the role of specific Interleukin-2 (IL-2) gene sequences in CD28-mediated mRNA stability.
  • To elucidate the mechanisms by which CD28 signaling impacts IL-2 mRNA levels over time.

Main Methods:

  • Utilized sequence-tagged genomic reporter constructs in T cells.
  • Analyzed IL-2 mRNA stability following T cell activation and CD28 signaling.
  • Identified specific exonic and coding region sequences responsive to CD28.

Main Results:

  • CD28 signaling transiently stabilizes IL-2 mRNA, dependent on sequences in exon 2 and exon 4.
  • Distinct CD28-responsive elements within the IL-2 coding region (between exon 3 and stop codon) promote mRNA decay at later times.
  • Identified previously unrecognized CD28-responsive elements within the IL-2 mRNA coding sequence.

Conclusions:

  • The IL-2 mRNA coding region harbors novel sequence elements that mediate CD28-dependent regulation of mRNA stability.
  • CD28 signaling exhibits dual effects on IL-2 mRNA stability: initial stabilization followed by enhanced decay.
  • These findings reveal complex post-transcriptional control mechanisms governing IL-2 expression in T cells.

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