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Published in: Cancer Chemotherapy and Pharmacology 5/2008

01-10-2008 | Original Article

Cytotoxic effects of treosulfan and busulfan against leukemic cells of pediatric patients

Authors: Doreen Munkelt, Ulrike Koehl, Stephan Kloess, Stefanie-Yvonne Zimmermann, Rabiá El Kalaäoui, Sibylle Wehner, Dirk Schwabe, Thomas Lehrnbecher, Ralf Schubert, Joerg Kreuter, Thomas Klingebiel, Ruth Esser

Published in: Cancer Chemotherapy and Pharmacology | Issue 5/2008

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Abstract

Purpose

The alkylating agent treosulfan exerts a high cytotoxic activity against various malignant cells. Due to limited non-hematological toxicity, treosulfan might be a promising compound in myeloablative therapy for hematopoietic transplantation in children. Since in vitro data regarding the activity of treosulfan against childhood leukemic cells are limited, we compared the effect of treosulfan and busulfan against pediatric leukemic and non-malignant cells.

Experimental design

Both agents were tested alone and in combination with fludarabine by means of the MTT and/or a five color-flow cytometric assay. Moreover, the induction of apoptosis by treosulfan was investigated via regulation of the proteinase caspase 3.

Results

Treosulfan was more active against leukemic cells of 20 children as well as against 3 leukemia-derived cell lines than busulfan, with increasing IC50 values from initial diagnosis to relapse. Overall purified stem cells were most sensitive, followed by CD56+CD3 NK and CD3+ T cells. The combination of treosulfan with fludarabine resulted in a synergistic effect against leukemic cells. In malignant cells, treosulfan induced rapid cell apoptosis measured by the activation of the centrally proteinase caspase 3.

Conclusion

Our results indicate that treosulfan has activity against pediatric leukemic cells, myeloablative potential and immunosuppressive properties suitable for conditioning regimen in childhood malignancies.
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Metadata
Title
Cytotoxic effects of treosulfan and busulfan against leukemic cells of pediatric patients
Authors
Doreen Munkelt
Ulrike Koehl
Stephan Kloess
Stefanie-Yvonne Zimmermann
Rabiá El Kalaäoui
Sibylle Wehner
Dirk Schwabe
Thomas Lehrnbecher
Ralf Schubert
Joerg Kreuter
Thomas Klingebiel
Ruth Esser
Publication date
01-10-2008
Publisher
Springer-Verlag
Published in
Cancer Chemotherapy and Pharmacology / Issue 5/2008
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-007-0669-3

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