Abstract
The SH2D2A gene, encoding the T cell-specific adapter protein (TSAd), is rapidly induced in activated T cells. In this study we investigate the regulation of the SH2D2A gene in Jurkat T cells and in primary T cells. Reporter gene assays demonstrated that the proximal 1-kb SH2D2A promoter was constitutively active in Jurkat TAg T cells and, to a lesser extent, in K562 myeloid cells, Reh B cells, and 293T fibroblast cells. The minimal SH2D2A promoter was located between position -236 and -93 bp from the first coding ATG, and transcriptional activity in primary T cells depended on a cAMP response element (CRE) centered around position -117. Nuclear extracts from Jurkat TAg cells and activated primary T cells contained binding activity to this CRE, as observed in an EMSA. Consistent with this observation, we found that a cAMP analog was a very potent inducer of SH2D2A mRNA expression in primary T cells as measured by real-time RT-PCR. Furthermore, activation of SH2D2A expression by CD3 stimulation required cAMP-dependent protein kinase activity. Thus, transcriptional regulation of the SH2D2A gene in activated T cells is critically dependent on a CRE in the proximal promoter region.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adaptor Proteins, Signal Transducing*
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Carrier Proteins / biosynthesis
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Carrier Proteins / genetics*
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Carrier Proteins / metabolism*
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Carrier Proteins / physiology
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Cell Line
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Cell Separation
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Cyclic AMP / analogs & derivatives*
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Cyclic AMP / pharmacology
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Cyclic AMP Response Element-Binding Protein / genetics
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Cyclic AMP Response Element-Binding Protein / physiology*
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Gene Expression Regulation / immunology
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Humans
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Jurkat Cells
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K562 Cells
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Lymphocyte Activation
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Nuclear Proteins / genetics
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Nuclear Proteins / metabolism
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Organ Specificity / genetics
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Organ Specificity / immunology
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Promoter Regions, Genetic* / immunology
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Protein Binding / genetics
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Protein Binding / immunology
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RNA, Messenger / biosynthesis
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Receptor-CD3 Complex, Antigen, T-Cell / physiology
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Response Elements / physiology
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T-Lymphocyte Subsets / immunology
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T-Lymphocyte Subsets / metabolism
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Thionucleotides / pharmacology
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Transcriptional Activation* / immunology
Substances
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Adaptor Proteins, Signal Transducing
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Carrier Proteins
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Cyclic AMP Response Element-Binding Protein
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Nuclear Proteins
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RNA, Messenger
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Receptor-CD3 Complex, Antigen, T-Cell
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SH2D2A protein, human
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Thionucleotides
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8-((4-chlorophenyl)thio)cyclic-3',5'-AMP
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Cyclic AMP