Latency, activation, and binding proteins of TGF-beta

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Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
06:54

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

K Koli1, J Saharinen, M Hyytiäinen

  • 1Department of Virology, Haartman Institute, University of Helsinki, FIN-00014 Helsinki, Finland. Katri.koli@helsinki.Fi

Microscopy Research and Technique
|February 15, 2001
PubMed

Insights

Transforming Growth Factor-beta (TGF-beta) superfamily proteins are key regulators of cell functions. They are secreted in latent complexes, requiring proteases for activation in processes like tissue remodeling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Transforming Growth Factor-beta (TGF-beta) superfamily comprises diverse polypeptide modulators crucial for cell growth, differentiation, and morphogenesis.
  • Three mammalian TGF-beta isoforms have been identified and molecularly cloned.
  • TGF-beta gene expression is regulated by various factors, including retinoids, steroid hormones, and vitamin D.

Purpose of the Study:

  • To elucidate the secretion and activation mechanisms of TGF-beta.
  • To understand the role of latent TGF-beta binding proteins (LTBPs) in TGF-beta biology.
  • To explore the significance of TGF-beta activation in physiological processes.

Main Methods:

  • Molecular cloning of TGF-beta isoforms.
  • Analysis of TGF-beta gene regulation.
  • Investigation of TGF-beta secretion pathways.
  • Characterization of latent TGF-beta complexes and LTBP interactions.

Main Results:

  • TGF-betas are secreted in latent forms, typically as large latent complexes involving LTBP.
  • LTBPs are essential for correct TGF-beta folding and secretion.
  • TGF-beta is deposited into the extracellular matrix via LTBPs.
  • Proteolytic release and activation of latent TGF-beta are tightly regulated.

Conclusions:

  • TGF-beta activation, regulated by proteolysis, allows for rapid increases in local TGF-beta concentrations.
  • This activation mechanism is critical in biological events such as cell invasion, tissue remodeling, and wound healing.

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