Yin-Yang 1 and Yin-Yang 2 exert opposing effects on the promoter activity of interleukin 4

Archives of Pharmacal Research
Sung Ho LeeBok Yun Kang

Abstract

Interleukin (IL)-4 acts on T cells as a growth and activation factor, and promotes the differentiation of type 2 T helper cells. In T cells, expression of the gene encoding IL-4 is regulated by inducible or constitutive factors. Yin-Yang (YY)-1 is one of constitutive transcription factors binding to the IL-4 promoter. The recently identified YY2 protein is similar to YY1, with both sharing high levels of homology in their zinc finger motifs. However, the role of YY2 in T cells is unclear. YY1 and YY2 were constitutively expressed in EL4 T cells, and their expression was not dependent on stimulation. IL-4 promoter (-741/+56 fragment) activity was enhanced by YY1, but inhibited by YY2. The enhanced IL-4 promoter activity by YY1 was reduced by simultaneous expression of YY2. In addition, the DNA binding affinity of YY1 to the IL-4 promoter was adversely affected by YY2. Our results suggest that YY1 and YY2 exert opposing effects on the IL-4 promoter as they compete for the same DNA binding sites.

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Nov 3, 2016·Proceedings of the National Academy of Sciences of the United States of America·Soroush TahmasebiNahum Sonenberg
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Sep 25, 2020·Journal of Cellular and Molecular Medicine·Lang LiShourong Wu

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