Phospholipase C-mediated hydrolysis of phosphatidylcholine is a target of transforming growth factor beta 1

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Updated: Aug 1, 2026

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

M T Diaz-Meco1, I Dominguez, L Sanz

  • 1Hospital General Gregorio Marañón, Madrid, Spain.

Molecular and Cellular Biology
|January 1, 1992
PubMed

Insights

Transforming growth factor beta 1 (TGF-β1) restrains cell growth by inhibiting a late signaling step. This study shows TGF-β1 blocks ras p21 coupling to phospholipase C, crucial for its antiproliferative effects.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Cancer research

Background:

  • Transforming growth factor beta (TGF-β) inhibits cell growth and tumor transformation in specific cell systems.
  • TGF-β1's mechanism of growth inhibition does not affect early mitogenic signal transduction.
  • Phospholipase C-catalyzed hydrolysis of phosphatidylcholine (PC) is a late-stage signaling event activated by growth factors.

Purpose of the Study:

  • To investigate whether the activation of phospholipase C-catalyzed hydrolysis of PC is a target of TGF-β1 action.
  • To elucidate the role of ras p21 signaling in TGF-β1's antiproliferative effects.

Main Methods:

  • Investigated the effect of TGF-β1 on the signaling cascade initiated by growth factors.
  • Focused on the role of phospholipase C and ras p21 in the context of TGF-β1 signaling.

Main Results:

  • Demonstrated that TGF-β1 inhibits the coupling of ras p21 to the activation of PC hydrolysis.
  • Identified this inhibition as a critical step for the antiproliferative effects of TGF-β1.

Conclusions:

  • TGF-β1 exerts its antiproliferative effects by targeting a late-stage signaling pathway.
  • Inhibition of ras p21-mediated PC hydrolysis is a key mechanism for TGF-β1's anti-growth activity in certain cell systems.

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