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Functional involvement of E-cadherin in TGF-beta 1-induced cell cluster formation of in vitro developing human

E Riedl1, J Stöckl, O Majdic

  • 1Institute of Immunology, Vienna International Research Cooperation Center, Novartis Research Institute, Vienna, Austria.

Journal of Immunology (Baltimore, Md. : 1950)
|July 21, 2000
PubMed

Insights

Transforming growth factor-beta 1 (TGF-β1) drives Langerhans cell (LC) development from human hematopoietic progenitor cells. This process involves E-cadherin-mediated cell clustering, crucial for LC generation.

Area of Science:

  • Immunology
  • Cell Biology
  • Hematopoiesis

Background:

  • Langerhans cells (LCs) are immature dendritic cells requiring TGF-β1 for development.
  • Mechanisms regulating LC generation from precursor cells are not fully understood.

Purpose of the Study:

  • To investigate the role of cell-cell interactions and E-cadherin in TGF-β1-induced LC development from human CD34+ hematopoietic progenitor cells.

Main Methods:

  • Culture of human CD34+ hematopoietic progenitor cells with TGF-β1 and other cytokines (GM-CSF, TNF-α, SCF, Flt3 ligand).
  • Analysis of cell cluster formation and expression of adhesion molecules (E-cadherin, CD103).
  • Inhibition studies using anti-E-cadherin monoclonal antibodies (mAbs) and other adhesion molecule blocking antibodies.

Main Results:

  • TGF-β1 costimulation induced pronounced cell clustering of developing LC precursors.
  • E-cadherin expression was upregulated during TGF-β1-induced LC development.
  • Blocking E-cadherin inhibited LC precursor clustering but allowed LC generation, while blocking other adhesion molecules inhibited both clustering and LC generation.

Conclusions:

  • Homotypic cell clustering mediated by E-cadherin is a key response to TGF-β1 during LC precursor development.
  • E-cadherin-dependent cell adhesion influences, but is not essential for, LC differentiation from hematopoietic progenitor cells.

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