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• W2089750363 abstract "Phosphorylated zidovudine (ZDV) concentrations may provide a link between drug exposure and clinical efficacy since these would include the active, intracellular form of the drug, ZDV triphosphate. Many groups are investigating the optimal methodology that can be used to accomplish this goal. The initial purpose of the present studies was to examine the effect of the inclusion of cell wash steps on the quantitation of intracellular ZDV. Ten milliliters of whole blood collected from healthy volunteers was spiked with increasing ZDV concentrations (0.187, 0.375, 1.87, and 3.75 microM), allowed to equilibrate at room temperature for 1 h, and separated into whole-blood components by a density gradient procedure. A mononuclear cell pellet was obtained, reconstituted with 2 ml of phosphate-buffered saline (PBS), and split into two aliquots, one of which was not washed at all and the other of which was washed four times with 1 ml of PBS. All samples were analyzed by ZDV radioimmunoassay (RIA) after a 1:1 dilution with either 1 mg of alkaline phosphatase (type 1-S; Sigma) per ml or PBS. Parent ZDV was measured in those samples which were not treated with the enzyme, while total ZDV was measured in those samples which were exposed to alkaline phosphatase (21 degrees C for 1 h). The result of the difference between the two samples is total phosphorylated ZDV. During the experiment, evidence of alkaline phosphatase interference with the RIA became apparent, confusing interpretation of intracellular ZDV concentrations. This evidence was based on three sets of data. First, wash samples showed increases in ZDV concentrations of as great as 0.127 microgramM after exposure to alkaline phosphatase, even though on microscopic inspection the wash samples were acellular. Second, the sum of total ZDV recovered from the four wash samples plus the washed cell pellet was as much as 14-fold greater than the total ZDV measured in the unwashed cell pellet. Theoretically, at least, these two entities should be equal. Finally, control samples of alkaline phosphatase in PBS (0.5 mg/ml) run directly through the assay measured false ZDV levels ranging from 0.002 to 0.075 microgramM (0.6 to 20 ng/ml). Alkaline phosphatase is frequently used to measure phosphorylated anabolites of ZDV in peripheral blood mononuclear cells. These data show that the particular form of alkaline phosphatase used may interfere with the ZDV RIA and may confuse the interpretation of phosphorylated anabolite concentrations of ZDV." @default.
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• W2089750363 title "Evidence of alkaline phosphatase interference in a zidovudine radioimmunoassay" @default.
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• W2089750363 doi "https://doi.org/10.1128/aac.38.12.2689" @default.
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