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Retinoic Acid Inhibits Adipogenesis Modulating C/EBPβ Phosphorylation and Down Regulating Srebf1a Expression

Jorge-Tonatiuh Ayala-Sumuano1, Cristina Vélez-DelValle2, Meytha Marsch-Moreno2

  • 1Instituto de Neurobiología, Universidad Nacional Autónoma de México, Blvd, Juriquilla 3001, Juriquilla, Querétaro, Mexico.

Journal of Cellular Biochemistry
|August 15, 2015
PubMed

Insights

Retinoic acid blocks adipose differentiation by inhibiting key gene expression and C/EBPβ phosphorylation. Cells treated with retinoic acid can be re-induced to differentiate after its removal, indicating a reversible block in adipogenesis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Adipogenesis is regulated by complex signaling pathways and transcription factors.
  • Retinoic acid is known to inhibit adipogenesis through various mechanisms.
  • The GSK3β-C/EBPβ-srebf1a axis is crucial for early adipogenesis, leading to PPARγ2 expression.

Purpose of the Study:

  • To investigate the anti-adipogenic effects of retinoic acid on the adipogenic transcriptional cascade.
  • To analyze the impact of retinoic acid on the expression of key adipogenic genes (cebpb, srebf1a, srebf1c, pparg2, cebpa).

Main Methods:

  • Cell culture experiments to induce adipogenesis.
  • Quantitative analysis of gene expression levels.
  • Western blotting to assess protein phosphorylation.

Main Results:

  • Retinoic acid blocks adipose differentiation at the commitment stage, rendering cells temporarily non-committed.
  • Retinoic acid downregulates srebf1a, srebf1c, pparg2, and cebpa gene expression.
  • While cebpb expression was not downregulated, retinoic acid inhibited C/EBPβ phosphorylation at Thr188, a critical regulatory step.

Conclusions:

  • Retinoic acid effectively inhibits adipogenesis by disrupting the transcriptional cascade and C/EBPβ activation.
  • The anti-adipogenic effect of retinoic acid is reversible upon removal of the compound.
  • Retinoic acid's mechanism does not involve the upregulation of DLK1/Pref1, a known anti-adipogenic factor.
Keywords:
3T3-F442AADIPOGENESISC/EBPβ; SREBP1aCELL DIFFERENTIATIONRETINOIC ACIDTRANSCRIPTIONAL CASCADE

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