Abstract
Ganciclovir (GCV) is prescribed for cytomegalovirus infection which is a major issue in immunodepressed patients. It is however characterized by hematological toxicity. A better understanding of GCV concentration-effects relationships implies the measurement of intracellular forms. The objective of this study was to develop a method to measure GCV and its derivatives in cells. A four-stage procedure was developed with the following strategy: (1) to separate into different fractions the different intracellular forms of GCV (GCV itself and its phosphorylated forms) by solid-phase extraction (SPE) from blood cells, (2) to dephosphorylate the different phosphorylated forms into GCV, (3) to perform a second SPE to desalt samples and concentrate GCV, and (4) to measure GCV concentrations in the different extracts using a triple-quadrupole, linear ion trap mass spectrometer. Finally, the procedure was tested in 17 patients receiving GCV. From lysed cells, the different forms of GCV were fractionated, the phosphorylated forms were eluted with different KCl solutions, and the obtained fractions were treated with acid phosphatase to transform the phosphorylated metabolites back into GCV. The method was validated from 5 to 500 μg L−1 with a limit of detection of 1 μg L−1. The whole procedure was validated according to the US Food and Drug Administration guidelines and successfully applied in 17 patients receiving GCV. The method liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) allowing the measurement of GCV and its phosphorylated forms in blood cells was developed and can be used in developing clinical studies to explore the role of these biomarkers in the event of toxicity.
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Abbreviations
- ACV:
-
Acyclovir
- AK:
-
Enzyme acetate phosphotransferase
- AUC:
-
Area under the curve
- C max :
-
Maximal concentration observed after drug intake
- C min :
-
Residual concentration
- CMV:
-
Cytomegalovirus
- CV:
-
Coefficient of variation
- GCV:
-
Ganciclovir
- GCV-DP:
-
Ganciclovir diphosphate
- GCV-MP:
-
Ganciclovir monophosphate
- GCV-TP:
-
Ganciclovir triphosphate
- IQC:
-
Internal quality control
- IS:
-
Internal standard
- LC-MS/MS:
-
Liquid chromatography coupled to tandem mass spectrometry
- LLOQ:
-
Lower limit of quantification
- LOD:
-
Limit of detection
- PBMC:
-
Peripheral blood mononuclear cell
- SPE:
-
Solid-phase extraction
- SRM:
-
Selected reaction monitoring
- T max :
-
Time at which appears the maximal concentration
- UPW:
-
Ultrapure water
- VGCV:
-
Valganciclovir
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Parts of this work “Discussed Poster Abstracts (2014). Fundamental & Clinical Pharmacology vol 28. doi: 10.1111/fcp.12065” were presented at the joint 18th Annual Meeting of French Society of Pharmacology and Therapeutics and 81th Annual Meeting of Society of Physiology [1].
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Billat, PA., Sauvage, FL., Picard, N. et al. Liquid chromatography tandem mass spectrometry quantitation of intracellular concentrations of ganciclovir and its phosphorylated forms. Anal Bioanal Chem 407, 3449–3456 (2015). https://doi.org/10.1007/s00216-015-8554-0
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DOI: https://doi.org/10.1007/s00216-015-8554-0