p0071 interacts with E-cadherin in the cytoplasm so as to promote the invasion and metastasis of non-small cell lung cancer.

As a member of the p120-catenin (p120ctn) subfamily, the p0071 study in tumor is very limited. We demonstrated the clinicopathological significance of p0071 in non-small cell lung cancer (NSCLC), as well as E-cadherin. Co-immunoprecipitation was used to detect the interaction of p0071 with E-cadherin in A549 and SPC cells (E-cadherin is mainly expressed in the cytoplasm of these cells). p0071 cytoplasmic expression was knocked down by siRNA in these cells and this effect on the RhoA activity and cell invasion and migration ability were measured. p0071 overexpression in the cytoplasm of tumor cell was correlated with lymphatic metastase and poor prognosis of NSCLC. The patients with both abnormal expression of p0071 and E-cadherin (cytoplasmic expression) had a statistically significant shorter survival than the patients without both abnormal expression (P  < 0.05). There is a significant correlation between cytoplasmic overexpression of p0071 and E-cadherin in NSCLC tissues. p0071 interacted with E-cadherin in the cytoplasm of A549 and SPC cell lines. Treatment with siRNA-p0071 inhibited the invasion and migration ability of NSCLC cells. Above results confirmed that p0071 interacted with E-cadherin in the cytoplasm so as to promote the invasion and metastasis of NSCLC.