RGD Reference Report - Decreased expression and promoter methylation of the menin tumor suppressor in pancreatic ductal adenocarcinoma. - Rat Genome Database

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Decreased expression and promoter methylation of the menin tumor suppressor in pancreatic ductal adenocarcinoma.

Authors: Cavallari, I  Silic-Benussi, M  Rende, F  Martines, A  Fogar, P  Basso, D  Vella, MD  Pedrazzoli, S  Herman, JG  Chieco-Bianchi, L  Esposito, G  Ciminale, V  D'Agostino, DM 
Citation: Cavallari I, etal., Genes Chromosomes Cancer. 2009 May;48(5):383-96.
RGD ID: 2317294
Pubmed: PMID:19170121   (View Abstract at PubMed)
DOI: DOI:10.1002/gcc.20650   (Journal Full-text)

Loss of menin, a tumor suppressor coded by the MEN1 gene, is a key factor in the pathogenesis of multiple endocrine neoplasia type I and in a percentage of sporadic endocrine tumors of the pancreas and parathyroid glands. This study investigated expression of the menin protein in the normal exocrine pancreas and in pancreatic ductal adenocarcinoma (PDAC), the most common pancreatic tumor. Immunofluorescence (IF) analyses showed that menin is expressed at high levels in normal acinar and duct cells. Examination of 24 clinical samples of PDAC revealed a pronounced decrease in menin expression in all tumors examined. To identify alterations underlying this defect, we searched for disruption and epigenetic silencing of the MEN1 gene. Analysis of nine laser-microdissected tumors revealed loss of heterozygosity of intragenic (one tumor) or adjacent (three tumors) MEN1 microsatellite markers. Methylation of CpG sites in the MEN1 promoter was documented in five of 24 tumors. IF analyses also revealed low to undetectable menin expression in the PDAC cell lines MiaPaCa-2 and Panc-1. Ectopic expression of menin in these cells resulted in a marked alteration of the cell cycle, with an increase in the G1/S+G2 ratio. These findings represent the first evidence that the MEN1 gene is a target of mutation and methylation in PDAC and that menin influences the cell cycle profile of duct cells.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
pancreatic ductal carcinoma  IDA 2317294 RGD 
pancreatic ductal carcinoma  IEP 2317294protein:decreased expression:pancreasRGD 
pancreatic ductal carcinoma  ISOMEN1 (Homo sapiens)2317294; 2317294protein:decreased expression:pancreasRGD 

Objects Annotated

Genes (Rattus norvegicus)
Men1  (menin 1)

Genes (Mus musculus)
Men1  (multiple endocrine neoplasia 1)

Genes (Homo sapiens)
MEN1  (menin 1)


Additional Information