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TGF-β and αvβ6 integrin act in a common pathway to suppress pancreatic cancer progression

Aram F Hezel1, Vikram Deshpande, Stephanie M Zimmerman

  • 1Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.

Cancer Research
|July 13, 2012
PubMed

Insights

Targeting the TGF-β pathway in pancreatic cancer may be counterproductive. Inhibiting TGF-β or αvβ6 integrin accelerated tumor progression, suggesting a tumor suppressor role for this pathway.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • The Transforming Growth Factor-beta (TGF-β) pathway is a potential cancer drug target due to its role in invasion and promoting a protumorigenic microenvironment.
  • However, its function in pancreatic cancer is complex, with genetic studies suggesting a tumor suppressor role, creating uncertainty for clinical applications of TGF-β inhibitors.

Purpose of the Study:

  • To investigate the therapeutic impact of global TGF-β inhibition in pancreatic cancer using genetically engineered mouse models.
  • To explore the relationship between TGF-β inhibition, tumor stage, genetic profile, and concurrent chemotherapy in pancreatic cancer.

Main Methods:

  • Utilized genetically engineered mouse models of pancreatic cancer.
  • Investigated the role of αvβ6 integrin as an upstream activator of TGF-β.
  • Assessed the effects of TGF-β or αvβ6 blockade on tumor cell proliferation and disease progression.
  • Examined the dependency of these effects on Smad4, a key mediator of TGF-β signaling.

Main Results:

  • αvβ6 integrin was identified as a key upstream activator of TGF-β in developing pancreatic cancers.
  • Both TGF-β and αvβ6 blockade led to increased tumor cell proliferation.
  • Inhibition of TGF-β or αvβ6 accelerated both early and later stages of pancreatic cancer progression.
  • These pro-tumorigenic effects were dependent on the presence of Smad4.

Conclusions:

  • The αvβ6 integrin and TGF-β pathway function together as a tumor suppressor mechanism in pancreatic cancer.
  • Pharmacologic inactivation of this pathway promotes pancreatic cancer progression.
  • Targeting TGF-β or αvβ6 may not be a viable therapeutic strategy and could potentially accelerate disease progression.

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