Abstract:
:CD4+ T cell priming under T helper type I (T(H)1) or T(H)2 conditions gives rise to polarized cytokine gene expression. We found that in these conditions human naive T cells acquired stable histone hyperacetylation at either the Ifng or Il4 promoter. Effector memory T cells showed polarized cytokine gene acetylation patterns in vivo, whereas central memory T cells had hypoacetylated cytokine genes but acquired polarized acetylation and expression after appropriate stimulation. However, hypoacetylation of the nonexpressed cytokine gene did not lead to irreversible silencing because most T(H)1 and T(H)2 cells acetylated and expressed the alternative gene when stimulated under opposite T(H) conditions. Such cytokine flexibility was absent in a subset of T(H)2 cells that failed to up-regulate T-bet and to express interferon-gamma when stimulated under T(H)1 conditions. Thus, most human CD4+ T cells retain both memory and flexibility of cytokine gene expression.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Messi M,Giacchetto I,Nagata K,Lanzavecchia A,Natoli G,Sallusto Fdoi
10.1038/ni872keywords:
subject
Has Abstractpub_date
2003-01-01 00:00:00pages
78-86issue
1eissn
1529-2908issn
1529-2916pii
ni872journal_volume
4pub_type
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