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Oncogenic Ras/Src cooperativity in pancreatic neoplasia

D J Shields1, E A Murphy, J S Desgrosellier

  • 1Department of Pathology, Moore's UCSD Cancer Center, San Diego, CA, USA.

Oncogene
|January 19, 2011
PubMed

Insights

Activating Kras and Src signaling cooperate to accelerate pancreatic ductal adenocarcinoma (PDA) development. Inhibiting Src suppresses tumor growth, suggesting Src-directed therapies for pancreatic cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Pancreatic cancer is highly lethal, with Kras mutations in 95% of cases.
  • Elevated c-Src activity is observed in over 60% of pancreatic cancers and linked to poor prognosis.
  • The role of c-Src in Kras-driven pancreatic tumorigenesis is not fully understood.

Purpose of the Study:

  • To investigate the contribution of c-Src activity to Kras-dependent pancreatic ductal adenocarcinoma (PDA) development.
  • To determine if oncogenic Kras and c-Src signaling cooperate in PDA initiation and progression.
  • To evaluate the therapeutic potential of Src inhibition in Kras/Src-driven pancreatic tumors.

Main Methods:

  • Utilized genetic manipulation in mouse models to delete C-terminal Src kinase (CSK) in the context of oncogenic Kras.
  • Analyzed tumor development, latency, and invasiveness.
  • Established and analyzed cell lines derived from Ras/Src-induced PDA to assess signaling dependencies.

Main Results:

  • Deletion of CSK alongside oncogenic Kras accelerated invasive PDA development within 5-8 weeks.
  • CSK deletion alone did not induce neoplasia, and oncogenic Kras alone resulted in PDA with low frequency and long latency.
  • Ras/Src-driven PDA cells demonstrated dependence on Src signaling, with Src inhibition suppressing tumor growth.

Conclusions:

  • Oncogenic Kras and c-Src signaling cooperate to accelerate pancreatic ductal adenocarcinoma onset.
  • Src inhibition represents a potential therapeutic strategy for pancreatic cancers driven by Ras/Src cooperativity.
  • These findings highlight the critical role of Src in Kras-driven pancreatic tumorigenesis.

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