caa a22 4500 477055931 CHVBK 20180405111346.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/s002280050201 doi (NATIONALLICENCE)springer-10.1007/s002280050201 Characterization of the cytochrome P450 involved in side-chain oxidation of cyclophosphamide in humans [Elektronische Daten] [F. Bohnenstengel, U. Hofmann, M. Eichelbaum, H. K. Kroemer] Objective: Cyclophosphamide (CP) is an antineoplastic prodrug which requires bioactivation (4-hydroxylation) by the cytochrome P450 (CYP) enzymes in human liver. In parallel, P450-mediated side-chain oxidation (N-dealkylation) leads to the formation of the non-alkylating dechloroethylcyclophosphamide (DCl-CP) and chloroacetaldehyde, the latter being a potential neurotoxic agent. The enzyme responsible for side-chain oxidation has not been identified yet. We therefore used an in vitro approach to characterize the enzyme involved in N-dealkylation of CP. Methods: CP was incubated with the microsomal fraction of human liver in the presence of specific inhibitors for some P450 enzymes and in the presence of stable expressed P450 enzymes. Dechloroethylcyclophosphamide was analysed using gas chromatography and nitrogen-phosphorus detection. Results: Formation of DCl-CP increased linearly with substrate concentration over the entire concentration range (20 μmol ⋅ l−1 to 36 mmol ⋅ l−1). Saturation of the enzyme was not observed. Incubation with stable expressed P450 enzymes and inhibition experiments indicated that CYP 3A4 was the major enzyme involved in side-chain oxidation of CP. Conclusions: Our in vitro data indicate that side-chain oxidation of CP occurs in dose-dependent fashion in men with no saturation of this pathway even following dose escalation. Thus enhanced neurotoxicity following CP administration may result in the setting of high-dose chemotherapy. Moreover, we conclude that CP has the potential to interact with other CYP 3A4 substrates. Springer-Verlag Berlin Heidelberg, 1996 Key words Cyclophosphamide nationallicence CYP 3A4 nationallicence side-chain oxidation nationallicence dechloroethylcyclophosphamide nationallicence Bohnenstengel F. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut Hofmann U. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut Eichelbaum M. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut Kroemer H. K. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut https://doi.org/10.1007/s002280050201 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s002280050201 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bohnenstengel F. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut NATIONALLICENCE 700 1- Hofmann U. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut NATIONALLICENCE 700 1- Eichelbaum M. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut NATIONALLICENCE 700 1- Kroemer H. K. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer