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J Biol Chem, Vol. 273, Issue 8, 4416-4423, February 20, 1998
Transcriptional Regulation of the Human FasL Promoter-Enhancer
Region
Carrie J.
Holtz-Heppelmann ,
Alicia
Algeciras§,
Andrew D.
Badley¶, and
Carlos V.
Paya §¶
From the Departments of Experimental Pathology and
§ Immunology, ¶ Division of Infectious Diseases, Mayo
Clinic, Rochester, Minnesota 55905
The human FasL enhancer region was cloned and
functionally characterized in transformed and primary T cells. Within
the 2.3 kilobase pairs of the FasL untranslated region, the distal 3' 300-base pair portion contains a single transcription initiation site
and confers basal and inducible transcriptional activity. Stimuli that
increase [Ca2+]i such as CD3 cross-linking
or ionomycin, but not activation of protein kinase C, were found to
induce FasL enhancer transcription in a cyclosporin-sensitive manner.
Moreover, calcineurin and NFAT, but not AP1, were identified as
necessary and sufficient effectors in driving FasL transcription
through an NFAT cis-acting motif (GGAAA). Additional modes of T cell
activation such as CD4 cross-linking were also found to induce NFAT
binding to the FasL enhancer region and to functionally transactivate
its transcription. These results indicate that the induction of FasL
gene transcription in T cells after CD3 or CD4 activation is
selectively mediated by calcineurin and NFAT.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.

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P. F. Dijkers, K. U. Birkenkamp, E. W.-F. Lam, N. S. B. Thomas, J.-W. J. Lammers, L. Koenderman, and P. J. Coffer
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Copyright © 1998 by the American Society for Biochemistry and Molecular Biology.
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