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• W2598966447 abstract "Gastric cancer is the third leading cause of cancer-related mortality worldwide. Chemotherapy is frequently used for gastric cancer treatment. Most patients with advanced gastric cancer eventually succumb to the disease despite some patients responded initially to chemotherapy. Thus, identifying molecular mechanisms responsible for cancer relapse following chemotherapy will help design new ways to treat gastric cancer. In this study, we revealed that the residual cancer cells following treatment with chemotherapeutic reagent cisplatin have elevated expression of hedgehog target genes GLI1, GLI2 and PTCH1, suggestive of hedgehog signaling activation. We showed that GLI1 knockdown sensitized gastric cancer cells to CDDP whereas ectopic GLI1 expression decreased the sensitivity. Further analyses indicate elevated GLI1 expression is associated with an increase in tumor sphere formation, side population and cell surface markers for putative cancer stem cells. We have evidence to support that GLI1 is critical for maintenance of putative cancer stem cells through direct regulation of ABCG2. In fact, GLI1 protein was shown to be associated with the promoter fragment of ABCG2 through a Gli-binding consensus site in gastric cancer cells. Disruption of ABCG2 function, through ectopic expression of an ABCG2 dominant negative construct or a specific ABCG2 inhibitor, increased drug sensitivity of cancer cells both in culture and in mice. The relevance of our studies to gastric cancer patient care is reflected by our discovery that high ABCG2 expression was associated with poor survival in the gastric cancer patients who underwent chemotherapy. Taken together, we have identified a molecular mechanism by which gastric cancer cells gain chemotherapy resistance." @default.
• W2598966447 created "2017-04-07" @default.
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• W2598966447 date "2017-03-14" @default.
• W2598966447 modified "2023-09-24" @default.
• W2598966447 title "GLI1-mediated regulation of side population is responsible for drug resistance in gastric cancer" @default.
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• W2598966447 doi "https://doi.org/10.18632/oncotarget.16174" @default.
• W2598966447 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5432345" @default.
• W2598966447 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28404967" @default.
• W2598966447 hasPublicationYear "2017" @default.
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