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A novel tylophorine analog W-8 up-regulates forkhead boxP3 expression and ameliorates murine colitis

Xianyi Meng1, Yun Zhang, Zhenghu Jia

  • 1College of Life Sciences, Nankai University, Tianjin, China.

Journal of Leukocyte Biology
|November 13, 2012
PubMed

Insights

A novel compound, W-8, boosts Foxp3 expression, crucial for regulatory T cells (Tregs). This enhances immune tolerance and may offer a new therapy for inflammatory diseases.

Area of Science:

  • Immunology
  • Pharmacology
  • Molecular Biology

Background:

  • Tylophorine analogs are phenanthroindolizidine alkaloids with known anticancer, antiviral, and anti-inflammatory properties.
  • The role of these compounds in immune system regulation, particularly concerning regulatory T cells (Tregs), is largely unexplored.
  • Forkhead box P3 (Foxp3) is a key transcription factor essential for Treg development and function, maintaining immune homeostasis.

Purpose of the Study:

  • To investigate the immunomodulatory effects of a novel tylophorine analog, designated W-8.
  • To determine W-8's impact on Foxp3 expression and the underlying molecular mechanisms.
  • To evaluate W-8's therapeutic potential in an experimental model of inflammatory bowel disease.

Main Methods:

  • Treatment of cells with W-8 to assess its effect on TGF-β-induced Foxp3 expression at mRNA and protein levels.
  • Analysis of signaling pathways, including AKT/mTOR and ERK, and epigenetic modifications (promoter demethylation) involved in Foxp3 regulation.
  • Administration of W-8 in a murine model of colitis induced by trinitrobenzene sulfonic acid (TNBS).
  • Assessment of Treg populations in lymphoid tissues and the conversion of naive T cells to Tregs in vivo.

Main Results:

  • W-8 significantly enhanced TGF-β-induced Foxp3 expression at both mRNA and protein levels.
  • W-8 synergistically increased TGF-β-induced p-Smad3 by inhibiting the AKT/mTOR pathway.
  • W-8 promoted Foxp3 promoter demethylation via inhibition of the ERK pathway and DNMT1 expression.
  • Administration of W-8 ameliorated TNBS-induced murine colitis and increased Treg numbers in lymphoid tissues.
  • W-8 promoted the in vivo conversion of naive T cells into Tregs.

Conclusions:

  • W-8 is a novel tylophorine analog that effectively enhances Foxp3 expression through both transcriptional and epigenetic mechanisms.
  • W-8 demonstrates therapeutic potential for inflammatory diseases by modulating Treg cell function and promoting immune tolerance.
  • The compound W-8 represents a promising candidate for the development of new anti-inflammatory agents.

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