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Dual role for TGF-beta1 in apoptosis

Amelia Sánchez-Capelo1

  • 1Servicio Neurobiología-Investigación, Hospital Ramón y Cajal, Ctra. Colmenar Viejo Km 9, 28034 Madrid, Spain. amelia.capelo@hrc.es

Cytokine & Growth Factor Reviews
|March 1, 2005
PubMed

Insights

Transforming growth factor-beta1 (TGF-beta1) plays a dual role in apoptosis, promoting or inhibiting cell death based on cellular context. Its complex molecular mechanisms involve Smad proteins and crosstalk with other signaling pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Transforming growth factor-beta1 (TGF-beta1) influences critical cellular processes like growth, migration, differentiation, and apoptosis.
  • TGF-beta1's role in apoptosis is context-dependent, capable of inducing either cell survival or cell death.
  • The precise molecular mechanisms governing TGF-beta1's involvement in apoptosis remain incompletely understood.

Purpose of the Study:

  • To elucidate the intricate molecular mechanisms by which TGF-beta1 regulates apoptosis.
  • To explore the interplay between TGF-beta1 signaling and various apoptotic pathways.

Main Methods:

  • Investigated the role of Smad proteins in TGF-beta1 intracellular signaling.
  • Examined the crosstalk between TGF-beta1 and death receptor (Fas, TNF), JNK, p38 MAP kinases, Akt, NF-kappaB, and Bcl-2 family mediated pathways.
  • Assessed TGF-beta1's contribution to oxidative stress and inflammatory processes relevant to apoptosis.

Main Results:

  • TGF-beta1 signaling primarily involves Smad proteins but also integrates with other apoptotic pathways.
  • TGF-beta1 interacts with death receptor, MAP kinase, Akt, NF-kappaB, and mitochondrial apoptotic pathways.
  • TGF-beta1 influences oxidative stress and the clearance of apoptotic bodies, indicating its broad integration into apoptotic signaling networks.

Conclusions:

  • TGF-beta1's pro- or anti-apoptotic effects are determined by the balance and interaction of multiple signaling inputs.
  • Understanding these complex interactions is crucial for deciphering TGF-beta1's multifaceted role in cell fate determination.

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