Identification of cis-acting regulatory elements controlling interleukin-4 gene expression in T cells: roles for NF-Y and NF-ATc.

AUTOR(ES)

Szabo, S J

RESUMO

Activity of the murine interleukin-4 (IL-4) promoter was localized to several cis-acting elements present within the first 300 bp from the transcriptional initiation site. Five repeated elements, P0 to P4, that share the common consensus ATTTTCCNNT were located between -40 and -250, and each was shown to interact with the T-cell-specific factor NF(P). These distinct P sites appear functionally interchangeable and cooperatively confer cyclosporin A-sensitive and ionomycin-inducible promoter activity. NF(P) may be closely related to the cytoplasmic component of NF-AT (nuclear factor of activated T cells), a T-cell-specific factor essential for IL-2 gene transcription, as judged from indistinguishable molecular weights and protease fragmentation patterns of UV-photolabeled factors. Also, we identified an element in the IL-4 promoter with homology to the Y box common to all major histocompatibility complex class II gene promoters. Our data show that the IL-4 promoter Y box -114CTGATTGG-107 significantly enhances overall promoter activity, since point mutations within this element diminish promoter activity by 85%. The factor binding this region is indistinguishable from the cloned nuclear factor NF-Y, as judged from interactions with specific anti-NF-Y monoclonal and polyclonal antibodies. Last, we point out the presence of two sites that share sequence identity to the OAP region of the ARRE-1 site within the IL-2 promoter (K. S. Ullman, W. M. Flanagan, C. A. Edwards, and G. R. Crabtree, Science 254:558-562, 1991). These regions, -85GTGTAATA-78 and -245GTGTAATT-238, reside adjacent to the NF(P) binding sites P1 and P4 and bind a distinct nuclear factor.

Documentos Relacionados

• Identification of cis-Acting Regulatory Elements Controlling Interleukin-4 Gene Expression in T Cells: Roles for NF-Y and NF-ATc
• Roles of cis-acting elements and chromatin structure in Drosophila alcohol dehydrogenase gene expression.
• ATF6 Activated by Proteolysis Binds in the Presence of NF-Y (CBF) Directly to the cis-Acting Element Responsible for the Mammalian Unfolded Protein Response
• Cis-acting regulatory elements controlling temporal and organ-specific activity of nopaline synthase promoter.
• A human cytomegalovirus early promoter with upstream negative and positive cis-acting elements: IE2 negates the effect of the negative element, and NF-Y binds to the positive element.