Abstract
Macrophage inflammatory protein 2 (MIP-2) is a chemotactic cytokine which mediates neutrophil recruitment in the lung and other tissues. Pneumotoxic particles such as quartz increase MIP-2 expression in rat lung and rat alveolar type II epithelial cells. Deletion mutant analysis of the rat MIP-2 promoter demonstrated quartz-induction depended on a single NFκB consensus binding site. Quartz activation of NFκB and MIP-2 gene expression in RLE-6TN cells was inhibited by anti-oxidants suggesting the responses were dependent on oxidative stress. Consistent with anti-oxidant effects, quartz was demonstrated to increase RLE-6TN cell production of hydrogen peroxide. Rotenone treatment of RLE-6TN cells attenuated hydrogen peroxide production, NFκB activation and MIP-2 gene expression induced by quartz indicating that mitochondria-derived oxidants were contributing to these responses. Collectively, these findings indicate that quartz and crocidolite induction of MIP-2 gene expression in rat alveolar type II cells results from stimulation of an intracellular signaling pathway involving increased generation of hydrogen peroxide by mitochondria and subsequent activation of NFκB.
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Driscoll, K.E., Howard, B.W., Carter, J.M., Janssen, Y.M.W., Mossman, B.T., Isfort, R.J. (2001). Mitochondrial-Derived Oxidants and Quartz Activation of Chemokine Gene Expression. In: Dansette, P.M., et al. Biological Reactive Intermediates VI. Advances in Experimental Medicine and Biology, vol 500. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0667-6_74
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DOI: https://doi.org/10.1007/978-1-4615-0667-6_74
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