Influence of CPG ODN on the down-regulation of pancreas cell line PANC-1 and the expression of TLR9 in human pancreatic cancer

Abstract

Objective To detect the expression of Toll-like receptor 9 (TLR9) in pancreatic cancer and to study the effect of CPG ODN2216 on the biological behavior of pancreatic cell carcinoma, and to explore their clinical significance. Methods Immunohistochemical method was used to examine the expression of TLR9 protein in pancreatic cancer tissue and immunofluorescence staining was also performed to detect TLR9 protein expression in pancreatic carcinoma cells. In vitro cell adhesion, wound-healing scrape assay, transwell invasion assay and cell colony formation assay were performed to assess the effect of CPG ODN2216 on the invasive properties of Panc-1 cells. Results TLR9 were highly expressed in the pancreatic cancer tissue and pancreatic carcinoma cells. In vitro experiments as cell spreading assays, cell adhesion, colony formation assay and invasion assays showed the cell adhesion and cell motility properties of CPG ODN 2216 group to be apparently weakened compared with the control group. MTT assay showed cell proliferation ability in the CPG ODN group to be notably decreased, and CPG ODN2216 had inhibitive effects on the growth of panc-1 cells in a dose and time-dependent manner. Conclusions TLR9 gene was correlated with the invasive and metastatic potentials of pancreatic carcinoma. The used of CPG ODN2216 induced the inhibition of migration and invasion of the Panc-1 cell line. Key words: CPG ODN2216; Pancreatic neoplasms; Toll-like receptor 9; Oncogenesis