Reg proteins promote acinar-to-ductal metaplasia and act as novel diagnostic and prognostic markers in pancreatic ductal adenocarcinoma
Qing Li, Hao Wang, George Zogopoulos, Qin Shao, Kun Dong, Fudong Lv, Karam Nwilati, Xian-Yong Gui, Adeline Cuggia, Jun-Li Liu, Zu-Hua Gao, Qing Li, Hao Wang, George Zogopoulos, Qin Shao, Kun Dong, Fudong Lv, Karam Nwilati, Xian-Yong Gui, Adeline Cuggia, Jun-Li Liu, Zu-Hua Gao
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive malignant tumor. Acinar-to-ductal metaplasia (ADM) and pancreatic intraepithelial neoplasia (PanIN) are both precursor lesions that lead to the development of PDAC. Reg family proteins (Reg1A, 1B, 3A/G, 4) are a group of calcium-dependent lectins that promote islet growth in response to inflammation and/or injuries. The aim of this study was to establish a role for Reg proteins in the development of PDAC and their clinical value as biomarkers. We found that Reg1A and Reg3A/G were highly expressed in the ADM tissues by immunohistochemistry. In the 3-dimensional culture of mouse acinar cells, Reg3A promoted ADM formation with concurrent activation of mitogen-acitvated protein kinase. Upregulation of Reg1A and Reg1B levels was observed as benign ductal epithelium progresses from PanIN to invasive PDAC. Patients with PDAC showed significantly higher serum levels of Reg1A and Reg1B than matching healthy subjects. These results were further validated by the quantification of Reg 1A and 1B mRNA levels in the microdissected tissues (22- and 6-fold increases vs. non-tumor tissues). Interestingly, patients with higher levels of Reg1A and 1B exhibited improved survival rate than those with lower levels. Furthermore, tissue expressions of Reg1A, Reg1B, and Reg4 could differentiate metastatic PDAC in the liver from intrahepatic cholangiocarcinoma with 92% sensitivity and 95% specificity. Overall, our results demonstrate the upregulation of Reg proteins during PDAC development. If validated in larger scale, Reg1A and Reg1B could become clinical markers for detecting early stages of PDAC, monitoring therapeutic response, and/or predicting patient's prognosis.
Keywords: acinar-to-ductal metaplasia; cholangiocarcinoma; pancreatic ductal adenocarcinoma; pancreatic intraepithelial neoplasia; Reg family proteins.
Conflict of interest statement
CONFLICTS OF INTEREST
There are no conflicts of interest to disclose.
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References
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