ABSTRACT
Objective To explore the expression and significance of phosphatidylinositol-3 kinase (PI3K)in ovarian cancer,and the effect of combined PI3K inhibitor(LY294002)therapy with cisplatin on epithelial ovarian carcinoma,and to explore if there is a synergistic effect between the two therapies. Methods The expression levels of PI3K p85 subunit proteins and mRNA were evaluated by western blot and RT-PCR in normal ovarian tissue(G1),ovarian benign tumor tissue(G2),ovarian borderline tumor tissue(G3)and ovarian cancer tissue(G4),and the relevant clinical pathological parameters were analyzed.SKOV3 ceils were isolated and cultured by enzymolysis method.SKOV3 cells were treated with culture medium only,LY294002(1,10,30,50,100 ?mol/L),cisplatin(0.33,1.25,2.5,5, 10 ?mol/L),LY294002(50 ?mol/L)+cisplatin(10 ?mol/L)for 2 days,respectively.The effect of LY294002 and cisplatin on the growth of SKOV3 cells was measured by methyl thiazolyl tetrazolium assay. Results There was no positive expression of PI3K p85 subunit proteins in G1 and G2,while the expression was 2/6 in G3,and 85%(33/39)in G4.PI3K p85 subunit mRNA expression levels were 0.178?0.102 in G1,0.643?0.112 in G2,0.847?0.058 in G3,1.689?0.423 in G4;there was a significant difference between G1,G2,G3 and G4(P0.05).Significant differences were noted between protein expression levels in G4(Ⅲ,Ⅳ)and G4(Ⅰ,Ⅱ;P