Mechlorethamine-induced DNA-protein Cross-linking in Human Fibrosarcoma (HT1080) Cells

Overview

Journal J Proteome Res

Publisher American Chemical Society

Specialty Biochemistry

Date 2011 Apr 14

PMID 21486066

Citations 35

Authors

Erin D Michaelson-Richie

Xun Ming

Simona G Codreanu

Rachel L Loeber

Daniel C Liebler

Colin Campbell

Natalia Y Tretyakova

Affiliations

Soon will be listed here.

Abstract

Antitumor nitrogen mustards, such as bis(2-chloroethyl)methylamine (mechlorethamine), are useful chemotherapeutic agents with a long history of clinical application. The antitumor effects of nitrogen mustards are attributed to their ability to induce DNA-DNA and DNA-protein cross-links (DPCs) that block DNA replication. In the present work, a mass spectrometry-based methodology was employed to characterize in vivo DNA-protein cross-linking following treatment of human fibrosarcoma (HT1080) cells with cytotoxic concentrations of mechlorethamine. A combination of mass spectrometry-based proteomics and immunological detection was used to identify 38 nuclear proteins that were covalently cross-linked to chromosomal DNA following treatment with mechlorethamine. Isotope dilution HPLC-ESI(+)-MS/MS analysis of total proteolytic digests revealed a concentration-dependent formation of N-[2-(S-cysteinyl)ethyl]-N-[2-(guan-7-yl)ethyl]methylamine (Cys-N7G-EMA) conjugates, indicating that mechlorethamine cross-links cysteine thiols within proteins to N-7 positions of guanine in DNA.

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