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
Using an optimized sample preparation protocol, described in chapter 3.2 it was possible to achieve better chromatographic resolutions and better sensitivity, to that described in the literature, enabling the determination of 5 steroids, androsterone, etiocholanolone, testosterone, 5-androstandiol, 11-hydroxyandrdostane, pregnandiol, with uncertainty below 1‰. This enable to evaluate the significant shift of the δ13C/12C [‰] values for each of examined steroids (excluding ERC).