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Pulmonary antioxidants exert differential protective effects against urban and industrial particulate matter

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Abstract

This investigation focuses on the application of anin vitro assay in elucidating the role of lung lining fluid antioxidants in the protection against inhaled particles, and to compare the toxicities of different airborne particulate matter (PM), PM10, collections from South Wales, UK.

PM collections from both urban and industrial sites caused 50% oxidative degradation of DNAin vitro at concentrations as low as 12.9 ± 2.1 μ ml-1 and 4.9 ± 0.9 μg ml-1 respectively. The primary source of this bioreactivity was found to be the soluble fraction of both particle collections. The coarser PM10_2.5 fraction also showed greater oxidative bioreactivity than the PM2.5_0.1 in both cases. When repeated in the presence of a low molecular weight fraction of fresh pulmonary lavage fluid, as well as in artificial lung lining fluid (200 (μM urate, glutathione and ascorbate), the DNA damage was significantly reduced in all cases(P 0.05). The antioxidants exerted a greater effect on the industrial samples than on the urban samples, and on the PM10_2.5 fractions than on the PM2.5_0.1 fractions, supporting the previous findings that respirable PM and urban samples contain fewer free radical sources than inhalable PM and industrial samples.

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Abbreviations

ELF:

Epithelial lining fluid

PM:

particulate matter

PUF:

polyurethane foam

sELF:

surrogate ELF

ROFA:

residual oil fly ash

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Authors and Affiliations

  1. Cardiff School of Biosciences, Cardiff University, Museum Avenue, PO Box 911, CF10 3US, Cardiff, UK

    L. L. Greenwell, T. Moreno & R. J. Richards

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  1. L. L. Greenwell
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  2. T. Moreno
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  3. R. J. Richards
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Correspondence to L. L. Greenwell.

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Greenwell, L.L., Moreno, T. & Richards, R.J. Pulmonary antioxidants exert differential protective effects against urban and industrial particulate matter. J. Biosci. 28, 101–107 (2003). https://doi.org/10.1007/BF02970139

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