Neutrophil-derived oxidants as mediators of chemical activation in bone marrow

Lorraine E. Twerdok, Michael A. Trush

Research output: Contribution to journalArticle

Abstract

Neutrophil-derived oxidants have been implicated in both damage to biomolecules and the metabolic activation of xenobiotics. Since the bone marrow is a relatively neutrophil-rich tissue which is subject to xenobiotic toxicity, we have characterized the oxidant generating capability of neutrophilic cells isolated from femurs of male C57BL/6J mice. Addition of the phorbol ester 12-O-tetradecanoylphorbol-13-acetate (TPA) to neutrophil preparations (70 ± 5% ring neutrophils and metamyelocytes) elicited superoxide anion generation, as indicated by superoxide dismutase (SOD)inhibitable acetylated cytochrome c reduction, and oxidant-dependent chemiluminescence (CL) from luminol or lucigenin. The interaction of benzo[a]pyrene-7,8-dihydrodiol (BP-diol), a proximate carcinogenic metabolite of benzo[a]pyrene (BP), with TPA-stimulated bone marrow neutrophils resulted in azide-inhibitable CL (90%) indicative of its myeloperoxidase-dependent oxidation to an excited-state intermediate. Covalent binding of [3H]BP-diol to exogenous DNA was similarly increased 3-fold in the presence of TPA-stimulated bone marrow neutrophils. Recently, our laboratory has shown that in addition to CL, TPA-stimulated human polymorphonuclear leukocytes can activate BP-diol to an intermediate which covalently binds to DNA and elicits mutagenicity in Salmonella typhimurium TA100. These observations combined with our current results suggest a possible role for neutrophil-derived oxidants in the mechanisms of chemically-induced bone marrow toxicity.

Original languageEnglish (US)
Pages (from-to)261-273
Number of pages13
JournalChemico-Biological Interactions
Volume65
Issue number3
DOIs
StatePublished - 1988

Keywords

  • Bone marrow
  • Polycyclic aromatic hydrocarbons
  • Reactive oxygen

ASJC Scopus subject areas

  • Toxicology

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