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Smad signal and TGFbeta induced apoptosis in human lymphoma cells

Anna Sebestyén1, Gábor Barna, Katalin Nagy

  • 1Ist Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, 1085 Budapest, Hungary. anna@korbl.sote.hu

Cytokine
|June 2, 2005
PubMed

Insights

Transforming growth factor beta1 (TGF-β1) can induce apoptosis in lymphomas. Inhibitory Smads in lymphoma cells block TGF-β1 signaling, but this resistance may be reversible.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Transforming growth factor beta1 (TGF-β1) exhibits antiproliferative and apoptotic effects on lymphoid cells.
  • Many lymphoid malignancies display resistance to endogenous TGF-β1, despite its potential to induce apoptosis in certain lymphomas.

Purpose of the Study:

  • To investigate the expression and activity of TGF-β1 signaling components in B cell lymphoma cell lines and human peripheral mononuclear cells (PBMCs).
  • To understand the role of Smad proteins and inhibitory Smads (ISmads) in TGF-β1 resistance in lymphomas.

Main Methods:

  • Analysis of Smad protein expression (Smad2, -3, -4, -6, -7) in B cell lymphoma cell lines (HT 58) and human PBMCs (healthy and B-CLL patients).
  • Assessment of TGF-β1 signaling activity via Smad2 phosphorylation, nuclear translocation of Smad2/3, and TIEG gene expression following TGF-β1 treatment.
  • Comparison of Smad expression profiles between lymphoma cells and normal PBMCs.

Main Results:

  • Non-treated lymphoma cells expressed signal transducer Smads (Smad2, -3, -4) and inhibitory Smads (Smad6, -7), unlike normal PBMCs.
  • TGF-β1 treatment led to the disappearance of Smad6 and increased Smad7 expression in HT 58 cells.
  • Evidence of active Smad signaling in treated lymphoma cells, including Smad2 phosphorylation, nuclear translocation, and increased TIEG expression.

Conclusions:

  • Smad signaling pathways are functional in certain human lymphoma cells.
  • Inhibitory Smad expression can impede TGF-β1 signal transmission in lymphomas.
  • The findings suggest that the diminished sensitivity of lymphoma cells to TGF-β1 may be reversible, offering potential therapeutic insights.

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