Abstract
Recent findings implied the significance of reactive oxygen species (ROS) as a part of tyrosine kinase inhibitors (TKIs) pharmacological activity. Evidences also suggested that toxic effects of TKIs were related to ROS production. The results regarding benefits of vitamin E usage alongside with prescribed TKIs therapy are ambiguous. We aimed to examine oxidative stress and antioxidative defense in human serum treated with four different TKIs and their possible interactions with hydrosoluble vitamin E analog (Trolox). An in-vitro experiment with serum pool as a substitute model was performed. Different parameters of oxidative stress and antioxidative defense were measured in serum pool with and without addition of TKIs (axitinib, crizotinib, nilotinib, and imatinib), before and after addition of Trolox. Z score statistic was used for calculation of Prooxidative and Antioxidative scores. The highest oxidative potential was recorded for samples incubated with imatinib and nilotinib, while the lowest damaging scores were observed for crizotinib and axitinib (nilotinib vs. imatinib, P < 0.05; axitinib vs. imatinib, P < 0.01; crizotinib vs. imatinib, P < 0.001). The best capability for antioxidative protection was seen in samples with nilotinib, then with imatinib, while the lowest level was obtained in samples with crizotinib and axitinib (imatinib and axitinib vs. nilotinib, P < 0.05 for both; crizotinib vs. nilotinib, P < 0.01; axitinib vs. imatinib, P < 0.05, crizotinib vs. imatinib, P < 0.01). Our results demonstrated the opposite effects of Trolox in combination with imatinib and nilotinib. Usage of antioxidant in combination with TKIs should be carefully evaluated in each specific case.