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J Biol Chem, Vol. 274, Issue 49, 35203-35210, December 3, 1999
From the Departments of Fas (CD95 or APO-1), a transmembrane cell surface
receptor of the tumor necrosis factor receptor family, is up-regulated
in activated T lymphocytes. Our present study identified an upstream enhancer element (between nucleotide positions
Transcriptional Regulation of Fas Gene Expression by GA-binding
Protein and AP-1 in T Cell Antigen Receptor·CD3
Complex-stimulated T Cells
,
¶,
,
,
,
, and
General Surgery,
¶ Immunology/Microbiology, and ** Medicine, Rush Presbyterian St.
Luke's Medical Center, Chicago, Illinois 60612, the
Division of
Clinical Immunology and Rheumatology, Department of Medicine, School of
Medicine, University of Alabama at Birmingham, Birmingham, Alabama
35284, and the 
Institute of Medical
Radiation Research and Cell Biology, University of Würzburg,
D-97080 Würzburg, Germany
862 and
682) containing a GA-binding protein (GABP) site and a low affinity activating protein-1 (AP-1)-binding site. T cell activation increased the DNA binding of GABP and AP-1 to this enhancer site. The specificity of GABP and AP-1 binding was demonstrated by competition
electrophoretic mobility shift assay and supershift electrophoretic
mobility shift assay with antibodies against GABP and AP-1,
respectively. Mutational analysis of Fas promoter revealed that both
GABP- and AP-1-binding sites were required for initiating Fas gene
transcription. We further show that anti-CD3 mAb, phorbol 12-myristate
13-acetate, and phorbol 12-myristate 13-acetate/ionomycin strongly
activated promoters carrying multiple copies of the Fas enhancer, and
mutation of either the GABP or AP-1 binding site severely reduced
transcriptional activity. Taken together, these results suggest that
the transcription factors GABP and AP-1 play a critical role in the
induction of Fas gene expression in T cell antigen
receptor·CD3-stimulated Jurkat cells.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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