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Inhibitory Smad7: emerging roles in health and disease

Marco A Briones-Orta1, Angeles C Tecalco-Cruz, Marcela Sosa-Garrocho

  • 1Departamento de Biología Celular y Desarrollo, Instituto de Fisiología Celular. Universidad Nacional Autónoma de México.

Current Molecular Pharmacology
|January 13, 2011
PubMed

Insights

Smad7 protein inhibits Transforming Growth Factor-beta (TGF-β) signaling and integrates other pathways. Dysregulation of Smad7 impacts homeostasis and disease, making it a potential therapeutic target.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Smad7 is an inhibitory Smad protein regulating Transforming Growth Factor-beta (TGF-β) signaling via negative feedback.
  • Smad7 also mediates crosstalk between TGF-β and other critical signaling pathways.
  • Upregulation of Smad7 follows TGF-β signaling, where it binds the TGF-β type I receptor, inhibiting R-Smad phosphorylation.

Purpose of the Study:

  • To review the known functions of Smad7.
  • To emphasize the role of Smad7 alterations in maintaining homeostasis.
  • To describe emerging roles of Smad7 in human diseases and its potential as a therapeutic target.

Main Methods:

  • Literature review of Smad7 functions.
  • Analysis of Smad7's role in TGF-β signaling.
  • Investigation of Smad7's involvement in physiological and pathological processes.

Main Results:

  • Smad7 antagonizes TGF-β-regulated cellular processes like proliferation, differentiation, apoptosis, adhesion, and migration.
  • Smad7 induction by cytokines is crucial for integrating various signaling pathways.
  • Altered Smad7 function is implicated in homeostasis and diseases such as fibrosis and cancer.

Conclusions:

  • Smad7 is a key regulator of physiological events and pathological processes.
  • Emerging evidence highlights Smad7's role in human diseases.
  • Smad7 represents a promising therapeutic target for diseases involving TGF-β signaling dysregulation.

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