Relationship between anticancer sensitivities and cellular respiration properties in 5-fluorouracil-resistant HCT116 human colorectal cancer cells.

5-Fluorouracil (5-FU) is widely used for colorectal cancer (CRC) treatment; however, continuous treatment of CRC cells with 5-FU can result in acquired resistance, and the underlying mechanism of 5-FU resistance remains unclear. We previously established an acquired 5-FU-resistant CRC cell line, HCT116R F10 , and examined its biological features and 5-FU resistance mechanisms. In this study, we evaluated the 5-FU sensitivity and cellular respiration dependency of HCT116R F10 cells and parental HCT116 cells under conditions of high- and low-glucose concentrations. Both HCT116R F10 and parental HCT116 cells were more sensitive to 5-FU under low-glucose conditions compared to high-glucose conditions. Interestingly, HCT116R F10 and parental HCT116 cells exhibited altered cellular respiration dependence for glycolysis and mitochondrial respiration under high- and low-glucose conditions. Additionally, HCT116R F10 cells showed a markedly decreased ATP production rate compared with HCT116 cells under both high- and low-glucose conditions. Importantly, glucose restriction significantly reduced the ATP production rate for both glycolysis and mitochondrial respiration in HCT116R F10 cells compared with HCT116 cells. The ATP production rates in HCT116R F10 and HCT116 cells were reduced by approximately 64% and 23% respectively under glucose restriction, suggesting that glucose restriction may be effective at enhancing 5-FU chemotherapy. Overall, these findings shed light on 5-FU resistance mechanisms, which may lead to improvements in anticancer treatment strategies.