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c-Jun NH(2)-terminal kinase (JNK)1 and JNK2 have distinct roles in CD8(+) T cell activation

Dietrich Conze1, Troy Krahl, Norman Kennedy

  • 1Section of Immunobiology, Department of Medicine, University of Vermont, Burlington, VT 05405, USA.

The Journal of Experimental Medicine
|April 3, 2002
PubMed

Insights

The c-Jun NH(2)-terminal kinase (JNK) signaling pathway has distinct roles in CD8(+) T cells. JNK1 deficiency impairs T cell expansion, while JNK2 deficiency enhances interleukin-2 production and proliferation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The c-Jun NH(2)-terminal kinase (JNK) signaling pathway is activated by cytokines and stress.
  • JNK signaling plays roles in cell death and differentiation, with cell-type-specific functions.
  • The specific roles of JNK1 and JNK2 in CD8(+) T cell activation are not fully understood.

Purpose of the Study:

  • To investigate the distinct roles of JNK1 and JNK2 in CD8(+) T cell activation.
  • To compare the functions of JNK1 and JNK2 in CD8(+) T cells with their known roles in CD4(+) T cells.

Main Methods:

  • Utilized JNK1- and JNK2-deficient CD8(+) T cells in in vitro studies.
  • Assessed interleukin-2 (IL-2) production and cell proliferation.
  • Measured IL-2 receptor alpha chain (CD25) gene and surface expression.
  • Analyzed nuclear activating protein 1 (AP-1) complexes.

Main Results:

  • Absence of JNK2 in CD8(+) T cells led to increased IL-2 production and proliferation.
  • JNK1-deficient CD8(+) T cells showed impaired antigen-stimulated expansion, even with exogenous IL-2.
  • Hypoproliferation in JNK1-deficient cells was linked to reduced IL-2 receptor alpha chain (CD25) expression.
  • Reduced nuclear AP-1 complexes in JNK1-deficient cells correlated with impaired CD25 gene expression.

Conclusions:

  • JNK1 and JNK2 exhibit differential functions during CD8(+) T cell activation.
  • The roles of JNK1 and JNK2 in CD8(+) T cells differ from those observed in CD4(+) T cells.
  • JNK1 is crucial for CD8(+) T cell expansion via regulation of IL-2 receptor expression.

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