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Proteomics of Smad4 regulated transforming growth factor-beta signalling in colon cancer cells

Naveid Ahmad Ali1, Matthew John McKay, Mark Paul Molloy

  • 1Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, Australia.

Molecular Biosystems
|September 24, 2010
PubMed

Insights

Transforming growth factor-beta (TGF-β) signaling impacts colon cancer progression differently based on Smad4. This study identified new Smad4-dependent and independent TGF-β responses in colon carcinoma cells.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Transforming growth factor-beta (TGF-β) signaling plays a complex, cell-type-specific role in cancer.
  • Smad4 is a critical mediator of the TGF-β pathway, frequently mutated or deleted in various cancers.

Purpose of the Study:

  • To investigate Smad4-regulated TGF-β signaling in colon cancer.
  • To identify Smad4-dependent and independent protein expression changes induced by TGF-β.

Main Methods:

  • Utilized iTRAQ mass spectrometry for quantitative proteomic screening.
  • Compared wild-type SW480 (Smad4-negative) and Smad4-restored SW480 colon carcinoma cells.
  • Applied 48-hour TGF-β stimulation to assess protein expression changes.

Main Results:

  • TGF-β stimulation induced 15 proteins and repressed 1 in Smad4-restored cells, versus 7 induced and 2 repressed in Smad4-wild-type cells.
  • Smad4-dependent regulation by TGF-β was observed for S100 protein family members (A2, A4, A10, A11), transgelin-2, and AKAP12.
  • TGF-β repressed S100 A4 independently of Smad4; other Smad4-independent responses involved ribosomes and cytoskeletal proteins.

Conclusions:

  • TGF-β exhibits distinct regulatory effects on protein expression in colon cancer cells based on Smad4 status.
  • Identified novel Smad4-dependent and independent molecular targets of TGF-β signaling in colon carcinoma.
  • Findings contribute to understanding the paradoxical role of TGF-β in cancer progression.

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