Conclusions
CS indeed represent an interesting group of compounds in the combat against multidrug-resistant cancers. After examining the cytotoxic effect of a chemical library of 66 CS on drug-sensitive and multidrug-resistant leukemia cells, implementation of QSAR and molecular docking analyses indicated a differential expression of Na+/K+-ATPase, which considerably contributes to the mode of action of these compounds. We have observed a down-regulation of Na+/K+-ATPase in multidrug-Conclusions
The aim of this work was to developed the standardized protocol of human urine pretreatment for the determination of steroids by GC/C/IRMS. The lack of the standardized protocol for the extensive process of human urine pretreatment could results in the discrepancy of the IRMS results thus influence the final decision related to the individual sportsman. Having in mind the complexity of the entire procedure, the use of the type of sorbent used for SPE, the type of solvent used for liquid–liquid extraction as well as enzyme used for hydrolysis, were investigated. The selected reagents described in the literature were applied and their effect on the IRMS results were evaluated. The parameters to be consider were retention time of each steroid and δ13C/12C value. Moreover, stability of the sample, recovery of analytes as well as precision of the results were taken into account. After critical evaluation of all investigated parameters, the best performance was obtained when C-18 sorbent, diethyl ether and β-glucuronidase E. coli were used.
ConclusionsCS indeed represent an interesting group of compounds in the combat against multidrug-resistant cancers. After examining the cytotoxic effect of a chemical library of 66 CS on drug-sensitive and multidrug-resistant leukemia cells, implementation of QSAR and molecular docking analyses indicated a differential expression of Na+/K+-ATPase, which considerably contributes to the mode of action of these compounds. We have observed a down-regulation of Na+/K+-ATPase in multidrug-ConclusionsThe aim of this work was to developed the standardized protocol of human urine pretreatment for the determination of steroids by GC/C/IRMS. The lack of the standardized protocol for the extensive process of human urine pretreatment could results in the discrepancy of the IRMS results thus influence the final decision related to the individual sportsman. Having in mind the complexity of the entire procedure, the use of the type of sorbent used for SPE, the type of solvent used for liquid–liquid extraction as well as enzyme used for hydrolysis, were investigated. The selected reagents described in the literature were applied and their effect on the IRMS results were evaluated. The parameters to be consider were retention time of each steroid and δ13C/12C value. Moreover, stability of the sample, recovery of analytes as well as precision of the results were taken into account. After critical evaluation of all investigated parameters, the best performance was obtained when C-18 sorbent, diethyl ether and β-glucuronidase E. coli were used.
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