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Identification of a novel repressor element in the cyclo-oxygenase-2 promoter and its nuclear binding protein

Xiaomin Yang1, Ling Lin, Xiongfei Zhang

  • 1Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, China.

Clinical and Experimental Pharmacology & Physiology
|June 4, 2008
PubMed

Insights

Researchers discovered a new repressor element in the mouse cyclo-oxygenase-2 (COX-2) promoter. This element, bound by the protein NonO, inhibits COX-2 gene activity, offering insights into disease regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Cyclo-oxygenase-2 (COX-2) plays a significant role in various diseases.
  • Transcriptional regulation of COX-2 is extensively studied, yet some regulatory elements remain unidentified.

Purpose of the Study:

  • To identify and characterize a novel repressor element within the mouse COX-2 promoter.
  • To identify proteins that bind to this novel repressor element.

Main Methods:

  • Utilized deletion and mutant constructs of the mouse COX-2 promoter in RINm5F cells.
  • Employed electrophoretic mobility shift assays to detect protein binding.
  • Purified and identified binding proteins using mass spectrometry.
  • Assessed the functional impact of NonO overexpression on COX-2 promoter activity.

Main Results:

  • Identified a novel repressor element in the mouse COX-2 promoter region (-655 to -632).
  • Determined that the protein NonO binds to this repressor element.
  • Demonstrated that NonO overexpression significantly inhibits wild-type COX-2 promoter activity, but not when the repressor element is mutated.

Conclusions:

  • A novel regulatory repressor element exists in the COX-2 promoter.
  • The protein NonO acts as a repressor for COX-2 gene activity.
  • Findings contribute to understanding COX-2 gene regulation and may inform therapeutic strategies for diseases involving COX-2 overexpression.

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