β cell transdifferentiation does not contribute to preneoplastic/metaplastic ductal lesions of the pancreas by genetic lineage tracing in vivo

Oliver Strobel, Yuval Dor, Amy Stirman, Amanda Trainor, Carlos Fernández-del Castillo, Andrew L. Warshaw, Sarah P. Thayer

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Inflammatory injury to the pancreas results in regeneration of normal tissue and formation of metaplastic lesions of a ductal phenotype. These metaplastic ductal lesions (MDL) are called tubular complexes (TC), mucinous metaplasia, or pancreatic intraepithelial neoplasia. Because they are regularly found in chronic pancreatitis and pancreatic cancer, their formation is thought to represent a step in inflammation-mediated carcinogenesis. Despite these lesions' ductal character, their origin is controversial. All known pancreatic cell lineages have been suggested as the origin. In vitro studies suggest that differentiated cells in the pancreas remain highly plastic and can transdifferentiate as a mechanism of regeneration and metaplasia. In vivo studies suggest that islets, specifically β cells, may be the cell of origin. However, in vitro studies are subject to ductal cell contamination, and previous in vivo studies interpret static data rather than direct evidence. Using genetic lineage tracing in vivo, we investigate whether transdifferentiation of β cells contributes to regeneration or metaplasia in pancreatitis. RIP-CreER;Z/AP mice were used to heritably tag β cells in the adult pancreas. Injury by cerulein pancreatitis resulted in regeneration of normal tissue and metaplasia with formation of two distinct types of TC and mucinous lesions. Lineage tracing revealed that none of these MDL are of β cell origin; nor do β cells contribute to regeneration of normal acinar and ductal tissue, which indicates that the plasticity of differentiated pancreatic islet cells, suggested by earlier static and in vitro studies, plays no role in regeneration, metaplasia, and carcinogenesis in vivo.

Original languageEnglish (US)
Pages (from-to)4419-4424
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume104
Issue number11
DOIs
StatePublished - Mar 13 2007

Keywords

  • Metaplasia
  • Pancreatic intraepithelial neoplasia
  • Pancreatitis

ASJC Scopus subject areas

  • General

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