The c-Met inhibitor may be a promising target molecule for irinotecan-based chemotherapy of gastric cancer.
Conclusion:Ĭancer stem cells have chemoresistance to irinotecan.
CALCUSYN SOFTWARE VERSION 2.0 PLUS
The SN38 plus SU11274 group more effectively suppressed in vivo tumour growth by OCUM-2M/SP cells than either group alone. The SU11274 significantly decreased the expression of UGT1A1, but not ABCG2 and ABCB1. There was a synergistic antiproliferative effect with a combination of SU11274 and SN38 in SP cells, but not other inhibitors. The SP cell lines had higher expression levels of UGT1A1, ABCG2, and ABCB1 than their parent cell lines. The IC 50 of irinotecan in SP-enriched CSC was 10.5 times higher than parent OCUM-2M cells, whereas that of oxaliplatin, taxol, gemcitabine, and 5-fluorouracil was 2.0, 2.8, 2.0, and 1.2, respectively. We examined the combined effects of inhibitors against stemness signals, including c-Met inhibitor SU11274, and five anticancer drugs on the CSC proliferation and mRNA expression of chemoresistance-associated genes. We used three gastric cancer cell lines and three side population (SP)-enriched CSC cell lines. This study aimed to determine an effective signal inhibitor with effects on the proliferation of CSCs in combination with anticancer drugs. Cancer stem cells (CSCs) may be postulated mediators of the chemoresistance.
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