NDLI: Interaction of GATA-3/T-bet transcription factors regulates expression of sialyl Lewis X homing receptors on Th1/Th2 lymphocytes

Content Provider	PubMed Central
Author	Chen, Guo-yun Osada, Hirotaka Santamaria-babi, Luis F. Kannagi, Reiji
Copyright Year	2006
Abstract	Selectin-dependent cell adhesion mediates inflammatory extravasation and routine homing of lymphocytes. Most resting peripheral T lymphocytes lack expression of sialyl Lewis X, the carbohydrate ligand for selectins, and are induced to strongly express it upon activation. T helper 1 (Th1) cells are known to more preferentially express sialyl Lewis X as compared with T helper 2 (Th2) cells upon activation. The molecular basis for this preferential expression, however, has not been elucidated to date. Here we show that the gene for fucosyltransferase VII (FUT7), the rate-limiting enzyme for sialyl Lewis X synthesis, is a unique example of the human genes with binding sites for both GATA-3 and T-bet, two opposing factors for Th1 and Th2 development, and is regulated transcriptionally by a balance of the two interacting transcription factors. T-bet promotes and GATA-3 represses FUT7 transcription. Our results indicated that T-bet interferes with the binding of GATA-3 to its target DNA, and also that GATA-3 significantly interferes with the binding of T-bet to the FUT7 promoter. T-bet has a binding ability to GATA-3, CBP/P300, and Sp1 to form a transcription factor complex, and GATA-3 regulates FUT7 transcription by phosphorylation-dependently recruiting histone deacetylase (HDAC)-3/HDAC-5 and by competing with CBP/P300 in binding to the N terminus of T-bet. Suppression of GATA-3 activity by dominant-negative GATA-3 or repressor of GATA (ROG) was necessary to attain a maximum expression of FUT7 and sialyl Lewis X in human T lymphoid cells. These results indicate that the GATA-3/T-bet transcription factor complex regulates the cell-lineage-specific expression of the lymphocyte homing receptors.
Related Links	http://dx.doi.org/10.1073/pnas.0607926103
Ending Page	16899
Page Count	6
Starting Page	16894
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	45
Volume Number	103
Language	English
Publisher	National Academy of Sciences
Publisher Date	2006-11-07
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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