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Mutagenesis Advance Access published online on July 26, 2006
Mutagenesis, doi:10.1093/mutage/gel032
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© The Author 2006. Published by Oxford University Press on behalf of the UK Environmental Mutagen Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org
Received May 30, 2006
Revised June 26, 2006
Accepted June 26, 2006

Review

Neutrophils and respiratory tract DNA damage and mutagenesis: a review

Ad M. Knaapen 1 *, Nejla Güngör 1, Roel P. F. Schins 2, Paul J. A. Borm 3, and Frederik J. Van Schooten 1

1 Nutrition and Toxicology Research Institute, Department of Health Risk Analysis and Toxicology, Maastricht University, Maastricht, The Netherlands
2 Institut für umweltmedizinische Forschung (IUF), Heinrich-Heine University, Düsseldorf, Germany
3 Centre of Expertise in Life Sciences, Zuyd University, Heerlen, The Netherlands

* To whom correspondence should be addressed.
Ad M. Knaapen, E-mail: a.knaapen{at}GRAT.unimaas.nl


  Abstract

Inflammation has been recognized as an important factor in cancer development. For the lung, experimental studies with rats, as well as molecular epidemiological studies in humans, have provided evidence that the influx of neutrophils into the airways may be an important process linking inflammation with carcinogenesis. Currently it is believed that the genotoxic capacity of neutrophils is a crucial aetiological factor in this carcinogenic response. In the present review we discuss two major pathways of neutrophil-induced genotoxicity: (i) induction of oxidative DNA damage through release of reactive oxygen species (ROS) and (ii) myeloperoxidase (MPO)-related metabolic activation of chemical carcinogens. So far, direct evidence for a role of neutrophils in pulmonary genotoxicity has largely been derived from in vitro studies using co-cultures of activated neutrophils and target cells. Current evidence from in vivo studies is primarily indirect and additional animal studies are needed to substantiate causality. A further challenge will be to extrapolate results from such studies to humans. Taken together, this will provide a better insight into the role of neutrophils in pulmonary carcinogenicity and may, hence, lead to novel approaches for cancer prevention strategies.


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