ABSTRACT
Objective To investigate the expression of(glutathione S-Transferase Omega-1,GSTO1)in cervical cancer tissue and its correlation with patient survival time,and to explore the impact of GSTO1 N-glycosylation on proliferation,migration,invasion,and epithelial-mesenchymal transition of cervical cancer.Methods By using immunohistochemistry,the expression levels of GSTO1 in tumor cells of 82 cervical cancer patients were detected,and the correlation between GSTO1 expression and clinical pathological features was analyzed.Kaplan-Meier meth-od was used to plot survival curves and evaluate the impact of GSTO1 expression in cervical cancer tissues on pa-tient survival time.Univariate and multivariate Cox regression analyses were performed to assess the independent prognostic factors influencing cervical cancer prognosis.The NetNGlyc 1.0 Server database predicted potential N-glycosylation modification sites of GSTO1(Asn55,Asnl35,Asn190).The cervical cancer cells(HeLa)were transfected with GSTO1 N-glycosylation site mutation vectors at positions 55,135,and 190,as well as GSTO1 wild-type vector and empty vector.Stable transfected cells were selected using puromycin.Western blot experi-ments were performed to assess the effectiveness of lentiviral interference.The effects of GSTO1 N-glycosylation site mutations on proliferation,migration,and invasion of HeLa cells were evaluated using EdU proliferation assay,wound healing assay,and Transwell assay.The effect of GSTO1 N-glycosylation site mutations on the epithelial-mesenchymal transition of HeLa cells was detected using the Western blot experiment.Results Immunohistochem-istry results revealed high expression of GSTO1 in cervical cancer tissues.The expression rate of GSTO1 was signifi-cantly higher in cervical cancer tissues with deep stromal invision≥1/2,lymphovascular space invasion,and lymph node metastasis(P＜0.05).Moreover,high expression of GSTO1 was associated with poorer overall surviv-al.After N-glycosylation site-specific mutation of GSTO1,the cell count of proliferation,migration,and invasion in HeLa cells significantly decreased(P＜0.05).The Western blot results showed that N-glycosylation site mutation of GSTO1 significantly inhibited the epithelial-mesenchymal transition of HeLa cells.Conclusion The expression of GSTO1 in cervical cancer tissues is associated with stromal infiltration depth,lymphovascular space invasion and lymph node metastasis,and it is also correlated with shorter patient survival time.Site-specific mutations in GSTO1 N-glycosylation significantly inhibit the proliferation,migration and epitheli al-mesenchymal transition of HeLa cells.