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B-Mediated Transcription of CD86 Gene in APC1


Departments of
*
Pathology and
Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032; and
Department of Surgery, Universita Degli Studi di Roma "La Sapienza," Instituto di II Clinica Chirurgica Servizio Trapianti dOrgano, Rome, Italy
CD8+CD28- human T suppressor cells (Ts)
act on APC, inhibiting their ability to elicit Th activation and
proliferation. This effect is due to inhibition of the CD40 pathway
which normally leads to CD80 and CD86 up-regulation. To determine
whether Ts inhibit expression of B7 molecules by blocking
transcription, we cloned and characterized the CD86 promoter.
Mutational analysis revealed that Ts inhibit transcription driven by
the CD86 promoter. The NF-
B binding site, at -612 of the CD86
promoter, is essential for Th-induced transcription. In cultures
containing Th and Ts, Ts inhibit Th-induced NF-
B activation in APC.
Together, these findings indicate that Ts inhibition of NF-
B
activation in APC is a means by which they regulate the activation and
proliferation of Th.
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