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Acinar‐to‐ductal metaplasia accompanies c‐myc‐induced exocrine pancreatic cancer progression in transgenic rodents

Acinar‐to‐ductal metaplasia accompanies c‐myc‐induced exocrine pancreatic cancer progression in... Several important characteristics of exocrine pancreatic tumor pathogenesis remain incompletely defined, including identification of the cell of origin. Most human pancreatic neoplasms are ductal adenocarcinomas. However, acinar cells have been proposed as the source of some ductal neoplasms through a process of acinar‐to‐ductal metaplasia. The oncogenic transcription factor c‐myc is associated with human pancreatic neoplasms. Transgenic mice overexpressing c‐myc under control of acinar cell‐specific elastase (Ela) gene regulatory elements not only develop acinar cell carcinomas but also mixed neoplasms that display both acinar‐like neoplastic cells and duct‐like neoplastic cells. In this report, we demonstrate that, first, c‐myc is sufficient to induce acinar hyperplasia, though neoplastic lesions develop focally. Second, cell proliferation remains elevated in the neoplastic duct cell compartment of mixed neoplasms. Third, the proliferation/apoptosis ratio in cells from all lesion types remains constant, suggesting that differential regulation of these processes is not a feature of cancer progression in this model. Fourth, before the development of mixed neoplasms, there is transcriptional activation of the duct cell‐specific cytokeratin‐19 gene promoter in multicellular foci of amylase‐positive acinar neoplasms. This observation provides direct evidence for metaplasia as the mechanism underlying development of ductal neoplastic cells within the context of an acinar neoplasm and suggests that the stimulus for this transformation acts over a multicellular domain or field within a neoplasm. Finally, focal ductal elements develop in some acinar cell carcinomas in Ela‐c‐myc transgenic rats, indicating that myc‐associated acinar‐to‐ductal metaplasia is not restricted to the mouse. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Cancer Wiley

Acinar‐to‐ductal metaplasia accompanies c‐myc‐induced exocrine pancreatic cancer progression in transgenic rodents

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References (25)

Publisher
Wiley
Copyright
Copyright © 2012 Wiley Subscription Services
ISSN
0020-7136
eISSN
1097-0215
DOI
10.1002/ijc.27322
pmid
22024988
Publisher site
See Article on Publisher Site

Abstract

Several important characteristics of exocrine pancreatic tumor pathogenesis remain incompletely defined, including identification of the cell of origin. Most human pancreatic neoplasms are ductal adenocarcinomas. However, acinar cells have been proposed as the source of some ductal neoplasms through a process of acinar‐to‐ductal metaplasia. The oncogenic transcription factor c‐myc is associated with human pancreatic neoplasms. Transgenic mice overexpressing c‐myc under control of acinar cell‐specific elastase (Ela) gene regulatory elements not only develop acinar cell carcinomas but also mixed neoplasms that display both acinar‐like neoplastic cells and duct‐like neoplastic cells. In this report, we demonstrate that, first, c‐myc is sufficient to induce acinar hyperplasia, though neoplastic lesions develop focally. Second, cell proliferation remains elevated in the neoplastic duct cell compartment of mixed neoplasms. Third, the proliferation/apoptosis ratio in cells from all lesion types remains constant, suggesting that differential regulation of these processes is not a feature of cancer progression in this model. Fourth, before the development of mixed neoplasms, there is transcriptional activation of the duct cell‐specific cytokeratin‐19 gene promoter in multicellular foci of amylase‐positive acinar neoplasms. This observation provides direct evidence for metaplasia as the mechanism underlying development of ductal neoplastic cells within the context of an acinar neoplasm and suggests that the stimulus for this transformation acts over a multicellular domain or field within a neoplasm. Finally, focal ductal elements develop in some acinar cell carcinomas in Ela‐c‐myc transgenic rats, indicating that myc‐associated acinar‐to‐ductal metaplasia is not restricted to the mouse.

Journal

International Journal of CancerWiley

Published: Jan 1, 2012

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