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- W2044733418 abstract "Defective expression of the mismatch repair protein MSH3 is frequently detected in colon cancer, and down-regulation of its expression was found to decrease sensitivity to platinum compounds or poly(ADP-ribose) polymerase inhibitors (PARPi) monotherapy. We have investigated whether MSH3 transfection in MSH3-deficient colon cancer cells confers resistance to oxaliplatin or PARPi and whether their combination restores chemosensitivity.MSH3-deficient/MLH1-proficient colon cancer HCT116(MLH1) cells were transfected with the MSH3 cDNA cloned into the pcDNA3.1(-) vector. MSH3/MLH1-deficient HCT116, carrying MLH1 and MSH3 mutations on chromosome 3 and 5, respectively, and HCT116 in which wild-type MLH1 (HCT116+3), MSH3 (HCT116+5) or both genes (HCT116+3+5) were introduced by chromosome transfer were also tested. Sensitivity to oxaliplatin and to PARPi was evaluated by analysis of clonogenic survival, cell proliferation, apoptosis and cell cycle.MSH3 transfection in HCT116 cells did not confer resistance to oxaliplatin or PARPi monotherapy. MSH3-proficient HCT116+5 or HCT116+3+5 cells, which were more resistant to oxaliplatin and PARPi in comparison with their MSH3-deficient counterparts, expressed higher levels of the nucleotide excision repair ERCC1 and XPF proteins, involved in the resistance to platinum compounds, and lower PARP-1 levels. In all cases, PARPi increased sensitivity to oxaliplatin.Restoring of MSH3 expression by cDNA transfection, rather than by chromosome transfer, did not affect colon cancer sensitivity to oxaliplatin or PARPi monotherapy; PARP-1 levels seemed to be more crucial for the outcome of PARPi monotherapy." @default.
- W2044733418 created "2016-06-24" @default.
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- W2044733418 date "2013-05-01" @default.
- W2044733418 modified "2023-10-14" @default.
- W2044733418 title "MSH3 expression does not influence the sensitivity of colon cancer HCT116 cell line to oxaliplatin and poly(ADP-ribose) polymerase (PARP) inhibitor as monotherapy or in combination" @default.
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- W2044733418 doi "https://doi.org/10.1007/s00280-013-2175-0" @default.
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