Silencing NEDD9 by lentivirus-delivered shRNA inhibits the growth of BxPC-3 cells in vitro and in vivo

Tielong Wu, Yuanyuan Dai, Lili Xue, Yingyue Sheng, Yao Zhong, Yuzheng Xue


Background: Neural precursor cell-expressed, developmentally downregulated protein 9 (NEDD9) is an invasion and metastasis-related gene. It has been proven to be highly expressed and closely associated with tumor proliferation and invasion in several types of human cancers including pancreatic adenocarcinoma. The present study was aimed to investigate and characterize the efficacy of silencing NEDD9 by lentivirus-delivered shRNA in pancreatic cancer (PC) BxPC-3 cells in vivo and in vitro.
Methods: Five kinds of PC cell lines were used to determine the cell line which expressed NEDD9 the most with qRT-PCR and western blotting. Then, we transduced the lentivirus-delivered NEDD9 shRNA into the human PC BxPC-3 cells to obtain a stable cell line expressing shRNA targeting NEDD9. NEDD9 mRNA and protein expression were measured by qRT-PCR and western blotting, respectively. Cell proliferation, migration, and invasion were assessed by cell colony formation, scratch wound healing, and Transwell assays, respectively. Mouse tumor xenografts were established by injecting tumor cells into the right flank of BALB/c nude mice. The effects of silencing NEDD9 on the growth of BxPC-3 cells in vivo were also examined.
Results: Among 5 kinds of PC cell lines, BxPC-3 cells were selected as the most suitab to carry out the following experiment. Transduction of lentivirus-delivered NEDD9 shRNA efficiently reduced NEDD9 expression in pancreatic adenocarcinoma BxPC-3 cells. Silencing NEDD9 by RNAi inhibited proliferation, migration, and invasion of BxPC-3 cells in cell culture. Importantly, it significantly reduced the growth of BxPC-3 cells in mouse xenografts.
Conclusions: Silencing NEDD9 by lentivirus-delivered shRNA efficiently inhibited the growth of PC BxPC-3 cells both in vitro and in vivo, and may prove to be a potential new therapeutic agent for human PC.