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Related Experiment Videos

TGFβ engages MEK/ERK to differentially regulate benign and malignant pancreas cell function.

D R Principe1, A M Diaz2, C Torres2

  • 1University of Illinois College of Medicine, Chicago, IL, USA.

Oncogene
|April 4, 2017
PubMed
Summary

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Transforming growth factor beta (TGFβ) signaling shifts from tumor suppression to promotion in advanced pancreatic cancer. ERK phosphorylation plays a dual role, initially aiding TGFβ

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • Transforming growth factor beta (TGFβ) signaling exhibits dual roles in pancreatic cancer, acting anti-proliferatively in early stages but promoting progression in advanced cancers.
  • Understanding the dysregulation of the TGFβ pathway is crucial for developing effective pancreatic cancer therapies.

Purpose of the Study:

  • To investigate the role of ERK phosphorylation in TGFβ signaling during pancreatic carcinogenesis.
  • To elucidate the differential functions of TGFβ and MEK/ERK pathways in benign, pre-neoplastic, and cancerous pancreatic cells.

Main Methods:

  • Generation of mouse models with TGFβ receptor deficiencies.
  • Analysis of ERK phosphorylation, pSMAD2, p21, and CDK2 levels in response to TGFβ.

Related Experiment Videos

  • Inhibition of ERK phosphorylation to assess its impact on TGFβ-induced cellular responses, including EMT.

    • Main Results:

    • TGFβ induced ERK phosphorylation in benign pancreatic duct cells, which was dependent on TGFBR1.
    • ERK inhibition in duct cells reduced TGFβ-induced pSMAD2 and p21, prevented CDK2 downregulation, and blocked EMT.
    • In neoplastic and cancer cells, ERK's role diverged, with pERK required for p21 upregulation and EMT but not pSMAD2 phosphorylation or CDK2 repression by TGFβ.

    Conclusions:

    • ERK acts as a key mediator in TGFβ signaling, initially facilitating cell cycle arrest but later antagonizing it during carcinogenesis.
    • ERK remains critical for the pathological EMT-inducing effects of TGFβ signaling in pancreatic cancer.
    • The TGFβ and MEK/ERK pathways exhibit a complex, stage-dependent interplay in pancreatic neoplasia.