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World J Gastroenterol. 2011 Mar 21;17(11):1434-41. doi: 10.3748/wjg.v17.i11.1434.

Proteomic analysis of pancreatic intraepithelial neoplasia and pancreatic carcinoma in rat models.

Author information

1
Department of Gastroenterology, the Ninth People's Hospital Affiliated to the School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.

Abstract

AIM:

To detect the proteomic variabilities of pancreatic intraepithelial neoplasia (PanIN) and pancreatic carcinoma (PC) induced by 7,12-dimethylbenzanthracene (DMBA) in rat models and to identify potential biomarkers.

METHODS:

Sixty adult male Sprague Dawley rats were randomized into three groups. The rats had DMBA implanted into their pancreas for one (n = 20) or two months (n = 20) or assigned to the normal group (n = 20). The rats were killed after one or two months, and were evaluated histopathologically. Three tissue samples from each group of rats with either normal pancreas, PanIN (PanIN-2) or PC were examined by 2D-DIGE. The different expression spot features were analyzed by matrix-assisted laser desorption/ionization-time of flight/time of flight (MALDI-TOF/TOF) tandem mass spectrometry. The expression of enolase 1, a differentially expressed protein, was identified by immunohistochemistry.

RESULTS:

There was significant difference in the proportions of neoplastic changes between the 1- and 2-mogroups (P = 0.0488). There was an increase in the frequency of adenocarcinomas in the 2-mo group compared with the 1-mo group (P = 0.0309). No neoplastic changes were observed in any of the animals in the normal group. Enolase 1, pancreatic ELA3B, necdin, Hbp23, CHD3, hnRNP A2/B1, Rap80, and Gnb2l1 were up-regulated in the PanIN and PC tissues, and CEL, TPT1, NME2, PCK2, an unnamed protein product, and glycine C-acetyltransferase were down-regulated in the PanIN and PC tissues. The immunohistochemical results showed that enolase 1 expression was up-regulated in the pancreatic cancer tissues of rats and humans.

CONCLUSION:

The pancreatic protein expression changes induced by DMBA suggest potential molecular targets for the early diagnosis and treatment of PC.

KEYWORDS:

7,12-dimethylbenzanthracene; Pancreatic carcinoma; Pancreatic intraepithelial neoplasia; Proteomics

PMID:
21472101
PMCID:
PMC3070016
DOI:
10.3748/wjg.v17.i11.1434
[Indexed for MEDLINE]
Free PMC Article

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