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International Immunology, Vol 10, 223-229, Copyright © 1998 by Oxford University Press

ARTICLES

Activation of the extracellular signal-regulated kinase pathway is differentially required for TCR-stimulated production of six cytokines in primary T lymphocytes

M Egerton, DR Fitzpatrick and A Kelso
The Queensland Institute of Medical Research, Post Office Royal Brisbane Hospital, Australia.

The extracellular signal-regulated kinase (ERK) signaling pathway is strongly activated in response to TCR stimulation in normal T cells. However, the extent to which activation of the ERK pathway is necessary for TCR-stimulated cytokine production is not clear. We have addressed this question by use of two separate methods to interfere with TCR activation of the ERK cascade. The first approach utilized transient expression of a catalytically inactive form of mitogen-activated/ERK 1 (CI-MEK1), while the second involved using the MEK1- and MEK2-specific inhibitor PD98059 to block ERK activation by the TCR. In order to assess the requirement for ERK activation in T cell cytokine production, we have measured the effect of ERK inhibition upon the production of six cytokines, IL-3, IL-4, IL-5, IL-10, granulocyte macrophage colony stimulating factor (GM-CSF) and IFN-gamma, by newly activated normal mouse T cells in response to TCR stimulation. The results of experiments using both methods to block ERK activation have revealed a requirement for intact ERK signaling for the full elicitation of TCR-stimulated cytokine production. Dose-response analyses using the MEK inhibitor PD98059 showed that the TCR-stimulated production of all cytokines measured was affected by this treatment. However, the production of IL-3 and IL-4 was only partially dependent upon ERK activation, whereas IL-5, IL-10, IFN-gamma and GM-CSF production was severely affected by diminished ERK activation. We conclude that the ERK pathway is differentially involved in the activation of different cytokine genes in normal T cells.
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