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Updated: Oct 22, 2025

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Smad2/3 Activation Regulates Smad1/5/8 Signaling via a Negative Feedback Loop to Inhibit 3T3-L1 Adipogenesis

Senem Aykul1,2, Jordan Maust1, Vijayalakshmi Thamilselvan1

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, 603 Wilson Road, East Lansing, MI 48824, USA.

International Journal of Molecular Sciences
|August 27, 2021
PubMed

Insights

Transforming growth factor-beta (TGF-β) family members regulate adipogenesis, the development of fat cells. This study reveals SMAD1/5/8 signaling is crucial for 3T3-L1 adipogenesis, uncovering a potential feedback loop.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Adipose tissue expansion occurs via adipocyte hypertrophy and hyperplasia.
  • Adipogenesis, or adipocyte differentiation, is regulated by developmental cues, including TGF-β family members.

Purpose of the Study:

  • To investigate how TGF-β family growth factors and inhibitors regulate adipocyte development using the 3T3-L1 cell model.
  • To elucidate the signaling pathways involved in adipogenesis regulation.

Main Methods:

  • Utilized the 3T3-L1 cell line as a model for adipogenesis.
  • Administered TGF-β family ligands, ligand traps, and SMAD signaling inhibitors (LDN-193189, SB-431542).
  • Analyzed the impact on adipocyte differentiation and SMAD signaling pathway activation (SMAD1/5/8 and SMAD2/3).

Main Results:

  • Activin and TGF-β family ligands, ligand traps, and LDN-193189 significantly suppressed 3T3-L1 adipogenesis.
  • Anti-adipogenic ligands and traps activated SMAD2/3 and inhibited SMAD1/5/8 signaling.
  • LDN-193189 inhibited SMAD1/5/8 signaling and adipogenesis, but its effects were not rescued by SB-431542, unlike ligand/trap effects.

Conclusions:

  • SMAD1/5/8 signaling plays a fundamental role in 3T3-L1 adipogenesis.
  • A negative feedback loop may link SMAD2/3 activation with SMAD1/5/8 inhibition in adipogenic precursors.
  • Findings provide insights into the molecular mechanisms controlling fat cell development.
Keywords:
3T3-L1BMPSMADTGF-βadipogenesissignaling

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