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Sensitivity and Resistance to Therapy

Amifostine (WR-2721) selective protection against melphalan genotoxicity

Abstract

Amifostine (WR-2721) is an aminothiol compound dephosphorylated at the tissue site by alkaline phosphatase to the active metabolite, which is able to inactivate electrophilic substances and scavenge free radicals. Amifostine effects against melphalan-induced DNA strand breaks were studied in normal human white blood cells (WBC) and K562 leukemic cells using the single cell gel electrophoresis (SCGE) or Comet assay, a reported method for measuring DNA damage in individual cells. Prior to treatment (1 h, 37°C) with increasing doses of melphalan, with or without S9, the cells were treated (15 min, 37°C) with a control medium or amifostine (3 mg/ml). Treatment of normal and leukemic cells with melphalan induced a dose-dependent ‘comet formation’. Melphalan-induced DNA damage follows a normal distribution in WBC. On the other hand, in K562, a significant proportion of undamaged cells remains even with doses at which mean DNA damage is serious. Pre-treatment with WR-2721 protects WBC, but not K562, against the genotoxic effect of melphalan. Amifostine might even strengthen the action of the antiblastic drug against K562 cells. S9 addition appears to enhance melphalan effectiveness. SCGE appears as a suitable primary screening method for in vitro and in vivostudies on drug–DNA interactions and their modulations by endogenous/exogenous factors. Leukemia (2000) 14, 1642–1651.

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Acknowledgements

This work was supported in part by grants from ‘Ministero dell’Università e della Ricerca Scientifica e Tecnologica’ (MURST – 40% & 60%), and ‘Associazione Italiana per la Ricerca sul Cancro’ (AIRC, Milano). ER is a recipient of an AIRC fellowship.

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Buschini, A., Anceschi, E., Carlo-Stella, C. et al. Amifostine (WR-2721) selective protection against melphalan genotoxicity. Leukemia 14, 1642–1651 (2000). https://doi.org/10.1038/sj.leu.2401877

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