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Cell intrinsic role of COX-2 in pancreatic cancer development

Reginald Hill1, Yunfeng Li, Linh M Tran

  • 1Corresponding Author: Hong Wu, Department of Molecular and Medical Pharmacology, CHS 33-131, 650 CE Young Drive South, Los Angeles, CA 90095, USA.

Molecular Cancer Therapeutics
|July 13, 2012
PubMed

Insights

Cyclooxygenase-2 (COX-2) plays a cell-intrinsic role in pancreatic ductal adenocarcinoma (PDAC) development by activating the PI3K/AKT pathway. Inhibiting COX-2 may delay PDAC, but overcoming AKT-mediated chemoresistance is also crucial.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Pancreatic ductal adenocarcinoma (PDAC) shows upregulated Cyclooxygenase-2 (COX-2), but its specific role in tumor initiation and progression remains unclear.
  • Previous research focused on COX-2 inhibition using NSAIDs or celecoxib, without distinguishing between cell-intrinsic and microenvironment effects.
  • The interplay between COX-2, PTEN loss, and the PI3K/AKT pathway in PDAC pathogenesis requires further elucidation.

Purpose of the Study:

  • To investigate the cell-intrinsic role of COX-2 in pancreatic cancer initiation and progression.
  • To elucidate the molecular mechanisms by which COX-2 influences PDAC development, particularly concerning the PI3K/AKT pathway.
  • To assess the potential of targeting COX-2 in PDAC treatment strategies.

Main Methods:

  • Utilized loss-of-function (Cox-2 deletion) and gain-of-function (COX-2 overexpression) approaches in genetically engineered mouse models (GEMMs) of PDAC.
  • Employed Pdx1-Cre, K-ras, and Pten conditional knockout mouse models to study PDAC development.
  • Analyzed molecular changes including p-AKT, FKBP5, and GRP78 expression levels in precursor lesions and tumors.

Main Results:

  • Cox-2 deletion in pancreatic progenitor cells significantly delayed PDAC development in mice with K-ras activation and Pten haploinsufficiency.
  • COX-2 overexpression accelerated PDAC onset and progression in the K-ras mouse model.
  • Mechanistically, COX-2 overexpression increased p-AKT levels, while Cox-2 deletion diminished them, indicating a role in PI3K/AKT pathway activation.
  • Alternative pathways involving FKBP5 and GRP78 can lead to AKT activation, driving PDAC progression independent of intrinsic COX-2.

Conclusions:

  • COX-2 exerts a significant cell-intrinsic role in PDAC initiation and progression, primarily through the activation of the PI3K/AKT pathway.
  • Targeting COX-2 may offer a therapeutic strategy to delay PDAC development and progression.
  • Overcoming compensatory AKT activation pathways is essential for enhancing the efficacy of anti-COX-2 therapies in PDAC treatment.

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