Activating transcription factor/cAMP response element binding protein family member regulated transcription of CD1A.
CD1a has a unique expression pattern among Ag-presenting molecules, expressed specifically on cortical thymocytes and APCs. As autoimmune disease, infection, and tumors can all result in alteration of CD1a expression, we are attempting to characterize the transcriptional regulation, and thus shed some light on specific expression, of CD1A. In this study, we have identified a minimal proximal promoter region required for CD1A transcription. Computer searches within this region identified numerous potential binding sites for lymphoid-specific transcription factors, including the ETS transcription factors, C/EBP, GATA, and CREB. Deletion and site-specific mutant analysis revealed a critical role of a potential cAMP response element (CRE) 965 bp upstream of the CD1A translation start site. Two activating transcription factor (ATF)/CREB family members, CREB-1 and ATF-2, are able to bind this site in vitro and in vivo. Notably, activation of ATF/CREB family members decreases CD1A transcription, while decrease in ATF-2 expression results in increased CD1A RNA level. The fact that these factors also bind the CD1A promoter in human monocytes strongly suggests a role for ATF/CREB family members in regulation of CD1A expression.
Colmone
Angela
A
Department of Pathology, University of Chicago, Chicago, IL 60637, USA.
Li
Sha
S
Wang
Chyung-Ru
CR
D051698:Activating Transcription Factor 2 / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D018949:Antigens, CD1 / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D001665:Binding Sites / Q000235:genetics; D002461:Cell Line, Transformed; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D019169:Jurkat Cells; D009000:Monocytes / Q000276:immunology / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011485:Protein Binding / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D014158:Transcription, Genetic; D020298:U937 Cells
C497105:ATF2 protein, human; D051698:Activating Transcription Factor 2; D018949:Antigens, CD1; C419393:CD1a antigen; C115163:CREB1 protein, human; D017362:Cyclic AMP Response Element-Binding Protein; D012333:RNA, Messenger