Early transcription and silencing of cytokine genes underlie polarization of T helper cell subsets - PubMed (original) (raw)
Early transcription and silencing of cytokine genes underlie polarization of T helper cell subsets
J L Grogan et al. Immunity. 2001 Mar.
Free article
Abstract
Naive CD4+ T cells activated through TCR/CD28 under Th1 or Th2 conditions expressed canonical cytokine patterns irrespective of cell division. Only cells that had divided fewer than four times were capable of reexpressing alternative cytokines when restimulated under opposing conditions. Although T cells transcribed both IFN-gamma and IL-4 within hours in a Stat4-/Stat6-independent manner, neither T-bet nor GATA-3 was induced optimally without Stat signals, and polarized cytokine expression was not sustained. Cytokine genes were positioned apart from heterochromatin in resting T cell nuclei, consistent with rapid expression. After polarization, the majority of silenced cytokine alleles were repositioned to heterochromatin. Naive T cells transit through sequential stages of cytokine activation, commitment, silencing, and physical stabilization during polarization into differentiated effector subsets.
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