Journal
PLOS ONE
Volume 11, Issue 12, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0167215
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Funding
- Molecular and Cell Biology Program of the Russian Academy of Sciences
- Russian Science Foundation
- Federal Agency of Scientific Organizations (Russia) [14-50-00068]
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The expression of the IL-2R alpha-chain (IL-2R alpha) is regulated at the transcriptional level via TCR- and IL-2R-signaling. The question is how to precede in time the activation signals to induce the IL-2R alpha expression in native primary T cells. By comparing the effects of selective drugs on the dynamics of CD25 expression during the mitogen stimulation of human peripheral blood lymphocytes, we identified distinct Src- and JAK-dependent stages of IL-2R alpha upregulation. PP2, a selective inhibitor of TCR-associated Src kinase, prevents CD25 expression at initial stages of T cell activation, prior to the cell growth. This early IL-2R alpha upregulation underlies the T cell competence and the IL-2 responsiveness. We found that the activated with weak mitogen, the population of blood lymphocytes has some pool of competent CD25+ cells bearing a high affinity IL-2R. A distinct pattern of IL-2R signaling in resting and competent T lymphocytes has been shown. Based on the inhibitory effect of WHI-P131, a selective drug of JAK3 kinase activity, we concluded that in quiescent primary T lymphocytes, the constitutive STAT3 and the IL-2-induced prolonged STAT5 activity (assayed by tyrosine phosphorylation) is mostly JAK3-independent. In competent T cells, in the presence of IL-2 JAK3/STAT5 pathway is switched to maintain the higher and sustained IL-2R alpha expression as well as cell growth and proliferation. We believe that understanding the temporal coordination of antigen-and cytokine-evoked signals in primary T cells may be useful for improving immunotherapeutic strategies.
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