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Association between matrix Gla protein and ulcerative colitis according to DNA microarray data.

Xu-Yang Dong1, Mei-Xu Wu1, Hui-Min Zhang1

  • 1Department of Gastroenterology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China.

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|April 8, 2020
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Summary

Matrix Gla protein (MGP) is elevated in ulcerative colitis (UC) and experimental colitis. Early growth response-1 (Egr-1) was identified as a key regulator of MGP expression in UC.

Keywords:
Egr-1matrix Gla proteinulcerative colitis

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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Immunology

Background:

  • Matrix Gla protein (MGP) has immunomodulatory roles and its expression is increased in ulcerative colitis (UC).
  • The precise function and regulatory mechanisms of MGP in UC remain largely uncharacterized.

Purpose of the Study:

  • To investigate the expression of MGP in UC.
  • To elucidate the upstream regulatory mechanisms controlling MGP expression in the context of UC.

Main Methods:

  • Analysis of colonic biopsies from UC patients and healthy controls.
  • Induction of experimental colitis in mice using dextran sodium sulfate (DSS).
  • Gene expression analysis (microarray, real-time PCR), protein analysis (immunoblot), immunohistochemistry, and bioinformatics approaches including luciferase-reporter assays.

Main Results:

  • MGP expression was significantly upregulated in colonic tissues of UC patients and DSS-induced colitis models, correlating positively with disease severity.
  • Bioinformatics analysis identified a conserved binding site for Early growth response-1 (Egr-1) in the MGP gene promoter.
  • Egr-1 expression was significantly higher in UC patients, and Egr-1 directly regulated MGP promoter activity.

Conclusions:

  • MGP is upregulated in ulcerative colitis and experimental colitis models.
  • Egr-1 acts as a transcriptional regulator of MGP expression in UC.