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Related Experiment Videos

Raf-1 is required for T cell IL2 production

H Owaki1, R Varma, B Gillis

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235-8884.

The EMBO Journal
|November 1, 1993
PubMed
Summary

Raf-1 activation is crucial for interleukin 2 (IL2) gene transcription and secretion in T cells, playing a key role in the immune response. This study demonstrates Raf-1

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Engagement of the T cell receptor/CD3 complex activates the serine/threonine kinase, Raf-1.
  • The physiological consequences of Raf-1 activation in T cells, particularly its role in interleukin 2 (IL2) production, were not well understood.

Purpose of the Study:

  • To investigate the effects of Raf-1 on IL2 production in T cells.
  • To determine the role of Raf-1 in IL2 gene transcription and secretion.

Main Methods:

  • Expression of an activated, truncated form of Raf-1 in Jurkat T cells using a metallothionein promoter.
  • Stimulation of T cells with antibodies to CD3 and CD28, in the presence and absence of phorbol myristate acetate (PMA).
  • Measurement of IL2 production and reporter gene transcription linked to the IL2 promoter.

Related Experiment Videos

  • Utilized a dominant-negative form of Raf-1 to assess its inhibitory effects on IL2 promoter activity.

    • Main Results:

    • Increased expression of active Raf-1 enhanced IL2 production stimulated by CD3/CD28 antibodies, even without PMA.
    • Active Raf-1 increased IL2 gene transcription by enhancing transcription from the IL2 promoter.
    • A dominant-negative form of Raf-1 inhibited IL2 promoter-directed transcription induced by phytohemagglutinin (PHA) and PMA.

    Conclusions:

    • Raf-1 activity is essential for IL2 gene transcription and subsequent secretion.
    • These findings establish a significant role for Raf-1 in regulating T cell-mediated immune responses.