Journal
TOXICOLOGY AND APPLIED PHARMACOLOGY
Volume 270, Issue 2, Pages 97-105Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.taap.2013.04.006
Keywords
Naphthalene; Glutathione conjugates; Airway epithelium; Nasal epithelium; Cytotoxicity; Rhesus macaques
Categories
Funding
- Naphthalene Research Council through the American Petroleum Institute
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Naphthalene produces species and cell selective injury to respiratory tract epithelial cells of rodents. In these studies we determined the apparent K-m, V-max, and catalytic efficiency (V-max/K-m) for naphthalene metabolism in microsomal preparations from subcompartments of the respiratory tract of rodents and non-human primates. In tissues with high substrate turnover, major metabolites were derived directly from naphthalene oxide with smaller amounts from conjugates of diol epoxide, diepoxide, and 1,2- and 1,4-naphthoquinones. In some tissues, different enzymes with dissimilar K-m and V-max appeared to metabolize naphthalene. The rank order of V-max (rat olfactory epithelium > mouse olfactory epithelium > murine airways >> rat airways) correlated well with tissue susceptibility to naphthalene. The V-max in monkey alveolar subcompartment was 2% that in rat nasal olfactory epithelium. Rates of metabolism in nasal compartments of the monkey were low. The catalytic efficiencies of microsomes from known susceptible tissues/subcompartments are 10 and 250 fold higher than in rat airway and monkey alveolar subcompartments, respectively. Although the strong correlations between catalytic efficiencies and tissue susceptibility suggest that non-human primate tissues are unlikely to generate metabolites at a rate sufficient to produce cellular injury, other studies showing high levels of formation of protein adducts support the need for additional studies. (C) 2013 Elsevier Inc. All rights reserved.
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