Application of trametinib in preparing medicine for reversing multi-medicine resistance of tumors
A multi-drug resistance and drug technology, applied in the direction of antineoplastic drugs, drug combinations, pharmaceutical formulations, etc., can solve the problem of low toxicity, unstudied reversal of tumor multi-drug resistance of trametinib, and no bright future and other issues to achieve the effect of restoring sensitivity
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Embodiment 1
[0036] (a) Trametinib can significantly restore the sensitivity of drug-resistant cells to the anticancer drug vincristine
[0037] Parental cells (KB) and P-gp high-expressing cells (KB V200 ) in a 96-well plate (5000 cells / well), after 4 hours the cells were completely adhered to the wall, vincristine was added to the corresponding wells in a concentration gradient, and the difference in the volume of the drug was filled with phosphate buffered saline (PBS), 72 After 1 hour, add 10 μL of 0.5 mg / ml thiazolium blue (MTT) to each well, incubate at 37°C for 4 hours, absorb the culture medium, and add 50 μL of dimethyl sulfoxide (DMSO) to each well to dissolve the crystals after drying. Measure the OD value at 570nm of the standard instrument; after combining different concentrations (1 μM, 3 μM and 10 μM) of trametinib with gradient concentrations of vincristine, repeat the above process, and set the combination of 10 μM verapamil and vincristine For comparison, calculate the IC5...
Embodiment 2
[0052] Trametinib can significantly restore the sensitivity of drug-resistant cells to the anticancer drug doxorubicin
[0053] Parental cells (KB) and P-gp high-expressing cells (KB V200 ) in a 96-well plate (5000 cells / well). After 4 hours of complete cell attachment, add doxorubicin to the corresponding wells in different concentration gradients. The difference in the volume of the drug was filled with phosphate buffered saline (PBS). 72 After 1 hour, add 10 μL of 0.5 mg / ml thiazolium blue (MTT) to each well, incubate at 37°C for 4 hours, absorb the culture medium, and add 50 μL of dimethyl sulfoxide (DMSO) to each well to dissolve the crystals after drying. Measure the OD value at 570nm of the standard instrument; after combining different concentrations (1 μM, 3 μM and 10 μM) of trametinib with gradient concentrations of doxorubicin, repeat the above process, and set the combination of 10 μM verapamil and doxorubicin For comparison, the IC50 of each group was calculated,...
Embodiment 3
[0059] Effect of trametinib on ATP hydrolase activity of P-gp
[0060] The transport of P-gp is driven by the hydrolysis of ATP. The interaction between the reversal agent and P-gp will affect the activity of ATP hydrolase, and the P-gp assay system (Promega, CAT: V3601) is used for detection. P-gp is first incubated with the substrate, and then a certain amount of ATP is added and then terminated. The ATP hydrolysis reaction of P-gp, the remaining ATP not metabolized by the hydrolase is detected by the luciferase reaction system. Compared with the no-substrate group, the greater the weakening of the fluorescence signal, the more ATP was consumed by P-gp, so the greater the signal decrease, the higher the P-gp activity; conversely, the increase of the signal indicated that the ATP hydrolysis activity was inhibited. In this experiment, different concentrations of trametinib were used as the substrate experimental group, and the experimental steps were as follows:
[0061] (1)...
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