Abstract
Purpose
Busulfan-melphalan high-dose chemotherapy followed by autologous stem cell transplantation is an essential consolidation treatment of high-risk neuroblastoma in children. Main treatment limitation is hepatic veno-occlusive disease, the most severe and frequent extra-hematological toxicity. This life threatening toxicity has been related to a drug interaction between busulfan and melphalan which might be increased by prior disturbance of iron homeostasis, i.e. an increased plasma ferritin level.
Methods
We performed an experimental study of busulfan and melphalan pharmacodynamic and pharmacokinetics in iron overloaded mice.
Results
Iron excess dramatically increased the toxicity of melphalan or busulfan melphalan combination in mice but it did not modify the clearance of either busulfan or melphalan. We show that prior busulfan treatment impairs the clearance of melphalan. This clearance alteration was exacerbated in iron overloaded mice demonstrating a pharmacokinetic interaction. Additionally, iron overload increased melphalan toxicity without altering its pharmacokinetics, suggesting a pharmacodynamic interaction between iron and melphalan. Based on iron homeostasis disturbance, we postulated that prior induction of ferritin, through Nrf2 activation after oxidative stress, may be associated with the alteration of melphalan metabolism.
Conclusion
Iron overload increases melphalan and busulfan-melphalan toxicity through a pharmacodynamic interaction and reveals a pharmacokinetic drug interaction between busulfan and melphalan.
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Abbreviations
- AUC:
-
Area under curve
- BMT:
-
Bone marrow transplantation
- BU:
-
Busulfan
- HSCT:
-
Hematopoietic stem cell transplantation
- HVOD:
-
Hepatic venooclusive disease
- LOD:
-
Limit of detection
- LOQ:
-
Limit of quantification
- MEL:
-
Melphalan
- QC:
-
Quality control
- SFN:
-
Sulforaphane.
- TTP:
-
Thiotepa
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ACKNOWLEDGMENTS AND DISCLOSURES
We thank all the staff of the animal unit at the Institute Gustave Roussy for their care of the animals. We are grateful to Irina Radu-Bouligand for editing the manuscript.
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Bouligand, J., Richard, C., Valteau-Couanet, D. et al. Iron Overload Exacerbates Busulfan-Melphalan Toxicity Through a Pharmacodynamic Interaction in Mice. Pharm Res 33, 1913–1922 (2016). https://doi.org/10.1007/s11095-016-1927-z
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DOI: https://doi.org/10.1007/s11095-016-1927-z