| Bioreactivity of carbon black and diesel exhaust particles to primary Clara and type II epithelial cell cultures. | |
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MedLine Citation:
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PMID: 10658537 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: To begin to elucidate the mechanisms of particle toxicity to the lung, the bioreactivity of four carbon black (CB) and diesel exhaust particles ((DEPs), a surrogate for particulate matter of aerodynamic diameter < 10 microns (PM10), were examined with primary cultures of Clara and type II epithelial cells. METHODS: The particles were extensively characterised by surface chemistry, size, and aggregation properties. Toxicity of the particles was assessed by determining cell attachment to an extracellular matrix substratum. RESULTS: The spherulite size range for the particles ranged from 50, 40, 20, 20, and 30 nm for CB1-4 and DEPs. All particle samples had different surface chemical compositions. CB1 was the least toxic to Clara (170 micrograms) and type II cells (150 micrograms) and CB4 was the most toxic (55 micrograms and 23 micrograms respectively). DEPs stored for 2 weeks were equally toxic to both epithelial cell types (27-28 micrograms). DEPs became progressively less toxic to type II cells with time of storage. Both primary epithelial cell types internalised the particles in culture. CONCLUSIONS: Bioreactivity was found to be related to CB particle spherulite size and hence surface area: the smaller the particle and larger the surface area, the more toxic the particles. Also, CB particles with the most complicated surface chemistry were the most bioreactive. Freshly prepared DEPs were equally toxic to type II and Clara cells and they became progressively less toxic to the type II cells with time. With all CB and DEPs, the primary epithelial cells internalised the particles, although this was noted most in cells of low functional competence. |
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Authors:
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S A Murphy; K A BéruBé; R J Richards |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Occupational and environmental medicine Volume: 56 ISSN: 1351-0711 ISO Abbreviation: Occup Environ Med Publication Date: 1999 Dec |
Date Detail:
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Created Date: 2000-02-22 Completed Date: 2000-02-22 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 9422759 Medline TA: Occup Environ Med Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 813-9 Citation Subset: IM |
Affiliation:
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Cardiff School of Biosciences, Cardiff University, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Carbon / toxicity* Cells, Cultured / drug effects Epithelial Cells / drug effects* Humans Mice Particle Size Vehicle Emissions / toxicity* |
| Chemical | |
Reg. No./Substance:
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0/Vehicle Emissions; 7440-44-0/Carbon |
| Comments/Corrections | |
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