Effects And Mechanism Of LKB1 On The Giant Cell Lung Cancer PGCL3 And Tca8113

Objective: Eukaryotic expression vector p CMV-LKB1 was recombined and transiently transfected into highly metastatic giant cell lung cancer cell lines PGCL3.The biological behavior was detected,further exploring the associated mechanismsMethods: p CMV-LKB1 was constructed and transiently transfected into highly metastatic giant cell lung cancer cell lines PGCL3.During the transiently transfection,the protein level of LKB1 was detected by western blotting.MTT assay,transwell assay were used to evaluate cell proliferation,migration and invasion,respectively.Western blotting was used to detect the expression of migration and invasion-associated protein MMP2/MMP9 and p-m TOR/VEGF,downstream proteins of LKB1.Results: The recombinant eukaryotic vector p CMV-LKB1 was identified by DNA sequencing,double enzyme digestion and PCR to confirm it was right.LKB1 fragment was inserted in the right direction,and the nucleic acid sequence of the fragment was the same as LKB1 gene published on NCBI.Compared with the control group,the expression of LKB1 increased significantly.Further,the cell behavior results showed that cell proliferation,migration and invasion capacity were all inhibited.The expression of MMP2 remained unchanged,while MMP9 increased significantly.Total m TOR remained the same,while the expression of p-m TOR/ VEGF reduced significantly.Conclusion: LKB1 can inhibit the proliferation ability of PGCL3 cells by downregulating the active part of m TOR(p-m TOR)and VEGF,the migration and invasion ability by downregulating MMP9 in PGCL3 cell lines.Objective : Previous studies showed that the serine-threonine kinases(LKB1)mutated or inactivated in kinds of cancers.We were curious about how the role of LKB1 in TSCC cells.The aim of this study was to investigate the role of LKB1 overexpression in the regulation of epithelial–mesenchymal transition(EMT)of the tongue squamous carcinoma cell line Tca8113 as well as explore the underlying mechanism.Methods:Restructured eukaryotic expression vector p CMV-LKB1 together with empty vectors were transfected into Tca8113 cells.After stable transfection,the protein levels of LKB1 were validated using western blot analysis.The proliferation ability and its mechanism were analyzed using cell counting plate assay and western blot,respectively.Meanwhile,The effects of LKB1 overexpression on the morphological changes in the Tca8113 cells were observed and evaluated.Besides,EMT-associated makers,MMP2,MMP9 and cell migration ability were assessed by western blot and the transwell assay,respectively in three cell groups.Results : p CMV-LKB1 was restructured successfully,LKB1 expression was significantly upregulated after transfection.The proliferation and migration ability were suppressed significantly.The expression of MMP2 remained unchanged,while the MMP9 and Vimentin was upregulated,E-cadherin and TGF-β1 upregulated.Conclusion:LKB1 upregulation could reduce migration by inhibiting the process of EMT and MMP9 in Tca8113 cells,proliferation by suppressing m TOR pathway.