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Repair of DNA interstrand crosslinks as a mechanism of clinical resistance to melphalan in multiple myeloma

Spanswick, VJ; Craddock, C; Sekhar, M; Mahendra, P; Shankaranarayana, P; Hughes, RG; Hochhauser, D; (2002) Repair of DNA interstrand crosslinks as a mechanism of clinical resistance to melphalan in multiple myeloma. BLOOD , 100 (1) 224 - 229. Green open access

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Abstract

Melphalan is widely used as a preparative agent in patients with multiple myeloma (MM) undergoing autologous stem cell transplantation (SCT). Although disease relapse is the major cause of death after a melphalan-conditioned autograft, the mechanism remains unclear. Melphalan produces a number of DNA adducts with the DNA interstrand crosslink (ICL) considered to be the critical cytotoxic lesion. By using a modification of the single-cell gel electrophoresis (Comet) assay, we have measured formation and repair of DNA ICL in plasma cells from melphalan-naive and melphalan-treated patients (ie, those who have relapsed after a melphalan-conditioned autologous SCT or oral melphalan therapy). Similar levels of dose-dependent DNA interstand crosslinking were observed in cells from both melphalan-naive and -treated patients. However, marked differences in ICL repair were observed: cells from naive patients showed no repair, whereas those from treated patients exhibited between 42% and 100% repair at 40 hours. In vitro sensitivity to melphalan in plasma cells was found to correlate with ICL repair. These findings suggest that ICL repair may be an important mechanism by which melphalan resistance emerges after autologous SCT or oral therapy. This mechanism may have implications for MM patients undergoing melphalan therapy.

Type: Article
Title: Repair of DNA interstrand crosslinks as a mechanism of clinical resistance to melphalan in multiple myeloma
Open access status: An open access version is available from UCL Discovery
Keywords: CHRONIC LYMPHOCYTIC-LEUKEMIA, ELECTROPHORESIS COMET ASSAY, DRUG-RESISTANCE, NITROGEN MUSTARDS, IN-VITRO, ENZYME EXPRESSION, P-GLYCOPROTEIN, LINKING, CELLS, CHLORAMBUCIL
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Oncology
URI: http://discovery.ucl.ac.uk/id/eprint/6868
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