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Mithramycin reduces expression of fibro-proliferative mRNAs in human gingival fibroblasts

O A Fajardo1, K Thompson, S K Parapuram

  • 1Department of Dentistry, University of Western Ontario, London, ON, Canada.

Cell Proliferation
|March 16, 2011
PubMed

Insights

Mithramycin, a drug targeting Sp1 transcription factors, reduced key fibrotic gene expression and cell proliferation in human gingival fibroblasts. This suggests Sp1-targeting drugs may offer new treatments for fibro-proliferative diseases.

Area of Science:

  • Fibrosis research
  • Molecular biology
  • Drug discovery

Background:

  • Fibrosis involves excessive fibroblast activity and extracellular matrix deposition, leading to tissue damage.
  • Current treatments for fibrosis are limited and often inefficient.
  • The Sp1 family of transcription factors plays a role in regulating gene expression.

Purpose of the Study:

  • To investigate the effects of mithramycin, an Sp1-targeting drug, on gene expression in human gingival fibroblasts.
  • To explore mithramycin's potential as a therapeutic agent for fibro-proliferative diseases.

Main Methods:

  • Treatment of human gingival fibroblasts with mithramycin.
  • Analysis of mRNA expression using microarray profiling and real-time polymerase chain reaction.
  • Validation of gene expression changes using western blot analysis.

Main Results:

  • Mithramycin significantly reduced the expression of connective tissue growth factor and type I collagen mRNAs.
  • Microarray analysis showed that mithramycin selectively inhibited cell proliferation and transforming growth factor-beta (TGF-β) signaling pathways.
  • Mithramycin suppressed key profibrotic mediators, including Smad3 and p300, and reduced fibroblast proliferation.

Conclusions:

  • The Sp1 family of transcription factors is implicated in the expression of fibrogenic genes in human gingival fibroblasts.
  • Mithramycin demonstrates potential as a therapeutic agent for treating fibro-proliferative diseases by targeting Sp1 transcription factors.

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