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Bisindoylmaleimide I suppresses adipocyte differentiation through stabilization of intracellular beta-catenin protein

Munju Cho1, Seoyoung Park, Jungsug Gwak

  • 1PharmacoGenomics Research Center, Inje University, Busan 614-735, Republic of Korea.

Biochemical and Biophysical Research Communications
|January 5, 2008
PubMed

Insights

Bisindolylmaleimide I (BIM), a protein kinase C (PKC) inhibitor, unexpectedly activates the Wnt/beta-catenin pathway. This activation inhibits adipocyte differentiation by increasing beta-catenin stability in preadipocytes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Wnt/beta-catenin signaling pathway is crucial for cell differentiation.
  • Wnt-10b activation of this pathway inhibits adipogenesis in preclinical models.
  • Protein kinase C (PKC) inhibitors are widely used in research.

Purpose of the Study:

  • To investigate the effect of bisindolylmaleimide I (BIM) on adipocyte differentiation.
  • To determine the role of the Wnt/beta-catenin signaling pathway in BIM-mediated inhibition of adipogenesis.

Main Methods:

  • Utilized HEK293 and 3T3-L1 preadipocyte cell lines.
  • Assessed beta-catenin responsive transcription (CRT) and intracellular beta-catenin levels.
  • Measured intracellular lipid accumulation and expression of adipocyte marker genes (PPARgamma, C/EBPalpha).

Main Results:

  • BIM treatment activated the Wnt/beta-catenin signaling pathway.
  • BIM increased beta-catenin levels and transcription.
  • BIM significantly inhibited lipid accumulation and down-regulated key adipocyte marker genes in 3T3-L1 cells.

Conclusions:

  • Bisindolylmaleimide I (BIM) inhibits adipocyte differentiation.
  • BIM exerts its inhibitory effect by activating the Wnt/beta-catenin signaling pathway.
  • BIM increases beta-catenin protein stability, leading to suppressed adipogenesis.

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