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Combination of 2-deoxy d-glucose and metformin for synergistic inhibition of non-small cell lung cancer: A reactive oxygen species and P-p38 mediated mechanism.
Biomedicine & Pharmacotherapy 2016 December
Targeting metabolism of lung cancer cells is a promising methodology for the treatment of lung cancer. In this regard, 2-Deoxy d-glucose (2-dDG) has been reported to inhibit cell proliferation by intervening the glycolytic pathway. However, phase I clinical trial of 2-dDG demonstrated cardiac side effects at higher dosage. Metformin (Met), on the other hand, has been reported to improve pathological response to chemotherapy in non-small cell lung cancer (NSCLC) patients. In this study, we propose that combination therapy of 2-dDG with Met will demonstrate enhanced cytotoxicity than either compound alone. Our results indicated that inhibition concentration 25 (IC25) for combined treatment of Met and 2-dDG showed more toxicity as compared to individual agents on a NSCLC cell line, A549. This augmented toxicity is associated with increased lipid peroxidation and decreased glutathione level as well as decreased super oxide dismutase and catalase activities. Combination of Met and 2-dDG also demonstrated enhanced DNA damage, DNA adduct formation, intracellular reactive oxygen species (ROS) level, and mitochondrial membrane potential alteration, as well as increased apoptosis, caspase-3 activity, P-p38 and P-AMP-activated protein kinase (AMPK) level. It was also shown that inhibition of caspase-3 and p38 kinase partially (75%-87%) reversed Met and 2-dDG induced cell death, without affecting the ROS levels. On the other hand, pre-treatment of cells with N-acetyl cysteine (NAC) reversed Met and 2-dDG induced cell death to >90%. Taken together, the results of this study demonstrated that combination of Met and 2-dDG showed better toxicity than individual compounds and cell death is ROS, P-p38 and caspase-3 mediated, thereby providing a proof of concept for the combination of Met and 2-dDG as a potential treatment protocol for NSCLC.
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