title: Transcriptional activation of the SH2D2A gene is dependent on a cyclic adenosine 5'-monophosphate-responsive element in the proximal SH2D2A promoter.
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.
authors.affiliation: Institute of Immunology and Institute of Pathology, National University Hospital, Oslo, Norway.
authors.forename: Ke-Zheng
authors.initials: KZ
authors.lastname: Dai
authors.forename: Finn-Eirik
authors.initials: FE
authors.lastname: Johansen
authors.forename: Kristin Melkevik
authors.initials: KM
authors.lastname: Kolltveit
authors.forename: Hans-Christian
authors.initials: HC
authors.lastname: Aasheim
authors.forename: Zlatko
authors.initials: Z
authors.lastname: Dembic
authors.forename: Frode
authors.initials: F
authors.lastname: Vartdal
authors.forename: Anne
authors.initials: A
authors.lastname: Spurkland
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism* / Q000502:physiology; D002460:Cell Line; D002469:Cell Separation; D000242:Cyclic AMP / Q000031:analogs & derivatives* / Q000494:pharmacology; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000502:physiology*; D005786:Gene Expression Regulation / Q000276:immunology; D006801:Humans; D019169:Jurkat Cells; D020014:K562 Cells; D008213:Lymphocyte Activation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D009928:Organ Specificity / Q000235:genetics / Q000276:immunology; D011401:Promoter Regions, Genetic / Q000276:immunology; D011485:Protein Binding / Q000235:genetics / Q000276:immunology; D012333:RNA, Messenger / Q000096:biosynthesis; D017260:Receptor-CD3 Complex, Antigen, T-Cell / Q000502:physiology; D020218:Response Elements / Q000502:physiology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism; D013873:Thionucleotides / Q000494:pharmacology; D015533:Transcriptional Activation / Q000276:immunology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D017362:Cyclic AMP Response Element-Binding Protein; D009687:Nuclear Proteins; D012333:RNA, Messenger; D017260:Receptor-CD3 Complex, Antigen, T-Cell; C405691:SH2D2A protein, human; D013873:Thionucleotides; C015929:8-((4-chlorophenyl)thio)cyclic-3',5'-AMP; D000242:Cyclic AMP