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Transcriptional inactivation of STAT3 by PPARgamma suppresses IL-6-responsive multiple myeloma cells

Li Hua Wang1, Xiao Yi Yang, Xiaohu Zhang

  • 1Basic Research Program, SAIC-Frederick, National Cancer Institute-Frederick, Frederick, MD 21702, USA. lhwang@ncifcrf.gov

Immunity
|February 21, 2004
PubMed

Insights

Peroxisome proliferator-activated receptor gamma (PPARgamma) agonists inhibit multiple myeloma cell growth and induce apoptosis. These compounds target STAT3 signaling, offering a novel therapeutic strategy for this incurable cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Multiple myeloma (MM) is a hematologic malignancy with limited curative options.
  • Novel therapeutic strategies targeting MM cell proliferation and survival are urgently needed.

Purpose of the Study:

  • To investigate the role of peroxisome proliferator-activated receptor gamma (PPARgamma) in multiple myeloma.
  • To evaluate the efficacy of PPARgamma agonists as a potential treatment for MM.

Main Methods:

  • MM cells were treated with PPARgamma agonists (15-d-PGJ2, troglitazone) and antagonists (GW9662).
  • Effects on cell proliferation, apoptosis, and gene expression were assessed.
  • STAT3 DNA binding and transactivation were analyzed via chromatin immunoprecipitation assays.

Main Results:

  • PPARgamma agonists significantly inhibited IL-6-inducible MM cell proliferation and induced apoptosis.
  • These agonists affected the expression of cell cycle and apoptosis-related genes.
  • PPARgamma agonists suppressed STAT3 DNA binding and transactivation without altering IL-6 receptor expression or JAK/STAT3, MAPK, and PI3K/Akt phosphorylation.

Conclusions:

  • PPARgamma activation represents a promising therapeutic avenue for multiple myeloma.
  • PPARgamma agonists inhibit MM progression by modulating STAT3 signaling through diverse mechanisms.

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