Abstract:
:Upon TCR engagement, naive CD4 T cells differentiate toward the Th1 or Th2 phenotype. IL-4, acting through Stat6, plays a major role in Th2 differentiation; IL-2 has also been reported to be essential. Here, we report that retroviral (RV)-mediated expression of a constitutively active Stat5A mutant (STAT5A1*6) can fully restore IL-4 production when naive CD4 T cells are primed in the absence of IL-2. Furthermore, STAT5A1*6 expression causes Th2 differentiation in the absence of IL-4 or in Stat6- or IL-4Ralpha-deficient cells. Infection with STAT5A1*6-NGFR-RV does not enhance GATA-3 expression. STAT5A1*6-NGFR-RV and GATA-3-GFP-RV each render the Il4 gene accessible, but the sites of restriction enzyme accessibility are different. Stat5A binds to HSII and HSIII sites of the Il4 gene. Coinfection with STAT5A1*6-NGFR-RV and GATA-3-GFP-RV results in optimal Th2 priming.
journal_name
Immunityjournal_title
Immunityauthors
Zhu J,Cote-Sierra J,Guo L,Paul WEdoi
10.1016/s1074-7613(03)00292-9keywords:
subject
Has Abstractpub_date
2003-11-01 00:00:00pages
739-48issue
5eissn
1074-7613issn
1097-4180pii
S1074-7613(03)00292-9journal_volume
19pub_type
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