NDLI: Cytotoxic T-lymphocyte antigen-4 inhibits GATA-3 but not T-bet mRNA expression during T helper cell differentiation

Content Provider	PubMed Central
Author	Nasta, Francesca Ubaldi, Vanessa Pace, Luigia Doria, Gino Pioli, Claudio
Copyright Year	2006
Abstract	Naive CD4+ T-cell differentiation to T helper 1 (Th1) and Th2 cells is dependent on T-bet and GATA-3 factors, respectively. T-bet and GATA-3, indeed, through chromatin remodelling allow transcriptional activation of Ifnγ and Th2 cytokine (Il4, Il5, Il13) genes, respectively. We investigated the effects of the negative costimulatory receptor cytotoxic T-lymphocyte antigen-4 (CTLA-4) on GATA-3 and T-bet mRNA expression and Th cell differentiation in mouse naive CD4+ T cells. Our results show that CTLA-4 inhibits GATA-3 mRNA expression and Th2 cell differentiation. At variance, CTLA-4 does not affect T-bet mRNA expression and Th1 cell differentiation. GATA-3 mRNA expression is inhibited when CD4+ cells are stimulated under both neutral (i.e. absence of cytokines) and Th2-polarizing (i.e. presence of interleukin (IL)-4) conditions, the effect being larger under the latter condition. Hence CTLA-4 might affect the IL-4/signal transducer and activator of transcription-6 (STAT6) pathway leading to GATA-3 mRNA up-regulation. We found, indeed, that CTLA-4 engagement inhibits STAT6 activation leaving unaffected the STAT6 protein level. Moreover, CTLA-4 engagement drastically inhibits IL-4Rα mRNA and protein up-regulation under Th2-polarizing conditions. Thus, CTLA-4 exerts a tight control on Th2 cell differentiation by negatively regulating both the CD3/CD28 and the IL-4/STAT6 pathways.
Related Links	http://dx.doi.org/10.1111/j.1365-2567.2005.02309.x
Ending Page	367
Page Count	10
Starting Page	358
File Format	PDF
ISSN	00192805
e-ISSN	13652567
Journal	Immunology
Issue Number	3
Volume Number	117
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2006-03-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Immunology Immunology and Allergy Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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