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Mol. Cell. Biol., 07 1995, 3830-3839, Vol 15, No. 7
T Yamagata, J Nishida, R Sakai, T Tanaka, H Honda, N Hirano, H Mano, Y Yazaki and H Hirai
Interleukin-5 (IL-5) is produced by T lymphocytes and known to support
B-cell growth and eosinophilic differentiation of the progenitor cells.
Using ATL-16T cells which express IL-5 mRNA, we have identified a region
within the human IL-5 gene promoter that regulates IL-5 gene transcription.
This cis-acting sequence contains the core binding motif, (A/T)GATA(A/G),
for GATA-binding family proteins and thus suggests the involvement of this
family members. In this report, we describe the cloning of human GATA-4
(hGATA-4) and show that hGATA-4 selectively interacts with the -70 GATA
site within the IL-5 proximal promoter region. By promoter deletion and
mutation analyses, we established this region as a positive regulatory
element. Cotransfection experiments revealed that both hGATA-4 and
phorbol-12- myristate-13-acetate (PMA)-A23187 stimulation are necessary for
IL-5 promoter activation. The requirement for another regulatory element
called CLE0, which lies downstream of the -70 GATA site, was also
demonstrated. ATL-16T cells express mRNAs of three GATA-binding proteins,
hGATA-2, hGATA-3, and hGATA-4, and each of them has a potential to bind to
the consensus (A/T)GATA(G/A) motif. However, using ATL-16T nuclear extract,
we demonstrated that GATA-4 is the only GATA- binding protein that forms a
specific DNA-protein complex with the -70 GATA site. An electrophoretic
mobility shift assay with extracts of COS cells expressing GATA-binding
proteins showed that GATA-4 has the highest binding affinity for the -70
GATA site among the three GATA- binding proteins. When the transactivation
abilities were compared among the three, GATA-4 showed the highest
activity. These results demonstrate the selective role of GATA-4 in the
transcriptional regulation of the IL-5 gene in a circumstance where
multiple members of the GATA-binding proteins are expressed.
Copyright © 1995, American Society for Microbiology
Of the GATA-binding proteins, only GATA-4 selectively regulates the human interleukin-5 gene promoter in interleukin-5-producing cells which express multiple GATA-binding proteins
Third Department of Internal Medicine, Tokyo University, Japan.
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