In vitro genotoxicity of PAH mixtures and organic extract from urban air particles part I: acellular assay
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
17442348
DOI
10.1016/j.mrfmmm.2007.03.001
PII: S0027-5107(07)00112-1
Knihovny.cz E-zdroje
- MeSH
- adukty DNA analýza MeSH
- benzopyren analýza MeSH
- karcinogeny životního prostředí toxicita MeSH
- krysa rodu Rattus MeSH
- látky znečišťující vzduch toxicita MeSH
- lidé MeSH
- organické látky toxicita MeSH
- pevné částice toxicita MeSH
- polycyklické aromatické uhlovodíky metabolismus toxicita MeSH
- testy genotoxicity metody MeSH
- zvířata MeSH
- Check Tag
- krysa rodu Rattus MeSH
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- adukty DNA MeSH
- benzo(a)pyrene-DNA adduct MeSH Prohlížeč
- benzopyren MeSH
- karcinogeny životního prostředí MeSH
- látky znečišťující vzduch MeSH
- organické látky MeSH
- pevné částice MeSH
- polycyklické aromatické uhlovodíky MeSH
Acellular assay of calf thymus DNA+/-rat liver microsomal S9 fraction coupled with (32)P-postlabelling was used to study the genotoxic potential of organic compounds bound onto PM10 particles collected in three European cities-Prague (CZ), Kosice (SK) and Sofia (BG) during summer and winter periods. B[a]P alone induced DNA adduct levels ranging from 4.8 to 768 adducts/10(8) nucleotides in the concentration dependent manner. However, a mixture of 8 c-PAHs with equimolar doses of B[a]P induced 3.7-757 adducts/10(8) nucleotides, thus suggesting the inhibition of DNA adduct forming activity by interaction among various PAHs. Comparison of DNA adduct levels induced by various EOMs indicates higher variability among seasons than among localities. DNA adduct levels for Prague collection site varied from 19 to 166 adducts/10(8) nucleotides, for Kosice from 22 to 85 and for Sofia from 6 to 144 adducts/10(8) nucleotides. Bioactivation with S9 microsomal fraction caused 2- to 7-fold increase in DNA adduct levels compared to -S9 samples, suggesting a crucial role of indirectly acting genotoxic EOM components, such as PAHs. We have demonstrated for the first time a significant positive correlation between B[a]P content in EOMs and total DNA adduct levels detected in the EOM treated samples (R=0.83; p=0.04). These results suggest that B[a]P content in EOM is an important factor for the total genotoxic potential of EOM and/or B[a]P is a good indicator of the presence of other genotoxic compounds causing DNA adducts. Even stronger correlation between the content of genotoxic compounds in EOMs and total DNA adduct levels detected (R=0.94; p=0.005) was found when eight c-PAHs were taken into the consideration. Our findings support a hypothesis that a relatively limited number of EOM components is responsible for a major part of its genotoxicity detectable as DNA adducts by (32)P-postlabelling.
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