Journal
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Volume 498, Issue 2, Pages 119-126Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2010.04.016
Keywords
Inducible nitric oxide synthase; Transcriptional regulation; Yin Yang 1; Nuclear factor I
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Funding
- Chinese National Programs for Fundamental Research and Development (973 program) [2009CB526401]
- University of Liaoning Province [2009R55]
- Special Fund of large scientific instruments-sharing services of Shenyang [2008gx-030]
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Previously we demonstrated the association between human iNOS -1026C/A variant and susceptibility to hypertension, and found that -1026C/A altered the Yin Yang 1 (YY1)-binding pattern. In the current study, we verified that -1026C/A was located in a vital regulatory region of the iNOS promoter, wherein existed a DNA-binding complex composed of YY1, nuclear factor I (NFI) and activator protein-1 (AP-1). We also observed that YY1 bound dominantly to -1026C, and NFI bound dominantly to -1026A. Furthermore, the repressive effect of YY1 was more evident than NFI on the iNOS promoter activity, resulting in a more marked reduction of iNOS expression via YY1/AP-1 than via NFI/AP-1 under the stimulation of cytomix. In conclusion, diverse binding affinities of YY1 and its interacting partners to iNOS -1026C/A resulted in differential promoter activity, and potent inhibition of iNOS expression by YY1/AP-1 complex with -1026C may contribute to an enhanced risk for hypertension. (c) 2010 Elsevier Inc. All rights reserved.
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