title: Conditional deletion of p53 and Rb in the renin-expressing compartment of the pancreas leads to a highly penetrant metastatic pancreatic neuroendocrine carcinoma.
abstract: Efforts to model human pancreatic neuroendocrine tumors (PanNETs) in animals have been moderately successful, with minimal evidence for glucagonomas or metastatic spread. The renin gene, although classically associated with expression in the kidney, is also expressed in many other extrarenal tissues including the pancreas. To induce tumorigenesis within rennin-specific tissues, floxed alleles of p53 and Rb were selectively abrogated using Cre-recombinase driven by the renin promoter. The primary neoplasm generated is a highly metastatic islet cell carcinoma of the pancreas. Lineage tracing identifies descendants of renin-expressing cells as pancreatic alpha cells despite a lack of active renin expression in the mature pancreas. Both primary and metastatic tumors express high levels of glucagon; furthermore, an increased level of glucagon is found in the serum, identifying the pancreatic cancer as a functional glucagonoma. This new model is highly penetrant and exhibits robust frequency of metastases to the lymph nodes and the liver, mimicking human disease, and provides a useful platform for better understanding pancreatic endocrine differentiation and development, as well as islet cell carcinogenesis. The use of fluorescent reporters for lineage tracing of the cells contributing to disease initiation and progression provides an unique opportunity to dissect the timeline of disease, examining mechanisms of the metastatic process, as well as recovering primary and metastatic cells for identifying cooperating mutations that are necessary for progression of disease.
authors.affiliation: Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY, USA.
authors.forename: S T
authors.initials: ST
authors.lastname: Glenn
authors.affiliation: Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Jones
authors.affiliation: Department of Laboratory Animal Resources, Roswell Park Cancer Institute, Buffalo, NY, USA.
authors.forename: S
authors.initials: S
authors.lastname: Sexton
authors.affiliation: Department of Pathology, Roswell Park Cancer Institute, Buffalo, NY, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: LeVea
authors.affiliation: IDEXX RADIL, Columbia, MO, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Caraker
authors.affiliation: Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, NY, USA.
authors.forename: G
authors.initials: G
authors.lastname: Hajduczok
authors.affiliation: Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY, USA.
authors.forename: K W
authors.initials: KW
authors.lastname: Gross
mesh_terms: D000818:Animals; D018278:Carcinoma, Neuroendocrine / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor; D005260:Female; D017353:Gene Deletion; D016158:Genes, p53; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009362:Neoplasm Metastasis; D010179:Pancreas / Q000378:metabolism* / Q000473:pathology; D010190:Pancreatic Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*; D019683:Penetrance; D012083:Renin / Q000235:genetics / Q000378:metabolism*; D016160:Retinoblastoma Protein / Q000235:genetics*
chemical_list: D016160:Retinoblastoma Protein; D012083:Renin