Published online before print April 26, 2007

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(American Journal of Pathology. 2007;171:263-273.)
© 2007 American Society for Investigative Pathology
DOI: 10.2353/ajpath.2007.061176

Acinar Cells Contribute to the Molecular Heterogeneity of Pancreatic Intraepithelial Neoplasia

Liqin Zhu^*, Guanglu Shi^*, C. Max. Schmidt, Ralph H. Hruban and Stephen F. Konieczny^*

From the Department of Biological Sciences and the Purdue Cancer Center,^* Purdue University, West Lafayette, Indiana; the Departments of Surgery and Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana; and the Departments of Pathology and Oncology, Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland

A number of studies have shown that pancreatic ductal adenocarcinoma develops through precursor lesions termed pancreatic intraepithelial neoplasia (PanIN). PanINs are thought to initiate in the small ducts of the pancreas through activating mutations in the KRAS proto-oncogene. What remains unanswered is the identification of the individual cell type(s) that contributes to pancreatic ductal adenocarcinoma formation. To follow the cellular and molecular changes that occur in acinar and duct cell properties on Kras^G12D expression, we took advantage of LSL-Kras^G12D/+/p48^Cre/+ mice, which faithfully mimic the human disease. In young animals (4 weeks), the predominant cellular alteration in the exocrine pancreas was acinar metaplasia in which individual acini consisted of acinar cells and duct-like cells. Metaplastic acinar structures were highly proliferative, expressed Notch target genes, and exhibited mosaic expression patterns for epidermal growth factor receptor, ErbB2, and pErk. This expression pattern paralleled the expression pattern detected in mouse PanINs, suggesting that mouse PanINs and acinar-ductal metaplasia follow similar molecular pathways. Indeed, immunofluorescence studies confirmed the presence of acinar cells within mPanIN lesions, raising the possibility that Kras^G12D-induced mPanINs develop from acinar cells that undergo acinar-ductal metaplasia. Identification of an acinar contribution to PanIN formation offers new directions for successful targeted therapeutic approaches to combat this disease.

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