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Related Experiment Videos

Lateral signaling enhances TGF-beta response complexity.

Stacey DaCosta Byfield1, Anita B Roberts

  • 1Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, National Institutes of health, Bethesda, MD 20892-5055, USA.

Trends in Cell Biology
|April 2, 2004
PubMed
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Transforming growth factor-beta (TGF-β) triggers opposing cellular responses in endothelial cells. A novel signaling paradigm reveals how a single TGF-β ligand activates distinct Smad proteins via a chimeric receptor, leading to diverse cellular outcomes.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Endothelial cell biology

Background:

  • Transforming growth factor-beta (TGF-β) exhibits context-dependent and cell-specific effects, including growth stimulation/inhibition and apoptosis/differentiation.
  • The precise mechanisms underlying these diverse TGF-β responses, despite a seemingly conserved receptor-Smad signaling pathway, remain incompletely understood.
  • Endothelial cells play critical roles in vascular homeostasis and disease, making their TGF-β response a key area of study.

Purpose of the Study:

  • To elucidate a novel signaling paradigm for TGF-β in endothelial cells.
  • To explain how a single TGF-β ligand can induce opposing cellular effects.
  • To investigate the role of a chimeric receptor complex and distinct Smad activation in mediating these opposing effects.

Main Methods:

Related Experiment Videos

  • Investigated TGF-β signaling pathways in endothelial cells.
  • Utilized a chimeric receptor complex model.
  • Analyzed the differential activation of Smad proteins (Smad2/3 and Smad1/5/8) in response to TGF-β.
  • Examined the downstream consequences of these distinct Smad activations.

Main Results:

  • Demonstrated that TGF-β can activate two different classes of Smad proteins in endothelial cells.
  • Identified a novel chimeric receptor complex involved in mediating these differential Smad activations.
  • Showed that activation of distinct Smad pathways by the same TGF-β ligand leads to opposing cellular outcomes, such as proliferation versus differentiation.
  • Linked specific Smad activation patterns to distinct cellular responses.

Conclusions:

  • Proposed a novel paradigm for TGF-β signaling in endothelial cells.
  • Highlighted the importance of differential Smad activation for context-dependent TGF-β responses.
  • Emphasized the role of a chimeric receptor complex in orchestrating opposing cellular effects mediated by a single ligand.
  • Provided new insights into the complexity of TGF-β signaling in vascular biology.