CovidV1, Istex, Corpus, bibRecord, 000900

Comparative Pulmonary Toxicities and Carcinogenicities of Chronically Inhaled Diesel Exhaust and Carban Black in F344 Rats

Identifieur interne : 000900 ( Istex/Corpus ); précédent : 000899; suivant : 000901

Comparative Pulmonary Toxicities and Carcinogenicities of Chronically Inhaled Diesel Exhaust and Carban Black in F344 Rats

Auteurs : K. J. Nikula ; M. B. Snipes ; E. B. Barr ; W. C. Griffith ; R. F. Henderson ; J. L. Mauderly

Source :

Toxicological Sciences [ 1096-6080 ] ; 1995.

RBID : ISTEX:6988EC44AED1100014AB6A4CBCBC4AF65DEA8EB6

Abstract

Diesel exhaust (DE) is a known pulmonary carcinogen in rats, and the carcinogenic response is known to require the presence of soot. Many estimates of human lung cancer risk from inhaled DE have been developed from rat bioassay data or from the comparative mutagenic potencies of DE soot extract and known human chemical carcinogens. To explore the importance of the DE soot-associated organic compounds in the lung tumor response of rats, male and female F344 rats were exposed chroni cally to diluted whole DE or aerosolized carbon black (CB) 16 hr/day, 5 days/week at target particle concentrations of 2.5 mg/m3 (LDE, LCB) or 6.5 mg/m3 (HDE, HCB) or to filtered air. The CB served as a surrogate for the elemental carbon matrix of DE soot. Considering both the mass fraction of solvent-extractable matter and its mutagenicity in the Ames Salmonella assay, the mutagenicity in revertants per unit particle mass of the CB was three orders of magnitude less than that of the DE soot. Both DE soot and CB particles accumulated progressively in the lungs of exposed rats, but the rate of accumulation was higher for DE soot. In general, DE and CB caused similar, dose-related, nonneoplastic lesions. CB and DE caused significant, exposure concentration-related increases, of similar magnitudes, in the incidences and prevalences of the same types of malignant and benign lung neoplasms in female rats. The incidences of neoplasms were much lower in males than females, and the mci dences were slightly higher among DE- than CB-exposed males. Survival was shortened in the CB-exposed males, and the short ened survival may have suppressed the expression of carcinoge nicity as measured by crude incidence. Logistic regression mod eling did not demonstrate significant differences between the carcinogenic potencies of CB and DE in either gender. The re sults suggest that the organic fraction of DE may not play an important role in the carcinogenicity of DE in rats.

Url:

https://api.istex.fr/ark:/67375/HXZ-WD4BGL2D-F/fulltext.pdf

DOI: 10.1093/toxsci/25.1.80

Links to Exploration step

ISTEX:6988EC44AED1100014AB6A4CBCBC4AF65DEA8EB6

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<front><div type="abstract">Diesel exhaust (DE) is a known pulmonary carcinogen in rats, and the carcinogenic response is known to require the presence of soot. Many estimates of human lung cancer risk from inhaled DE have been developed from rat bioassay data or from the comparative mutagenic potencies of DE soot extract and known human chemical carcinogens. To explore the importance of the DE soot-associated organic compounds in the lung tumor response of rats, male and female F344 rats were exposed chroni cally to diluted whole DE or aerosolized carbon black (CB) 16 hr/day, 5 days/week at target particle concentrations of 2.5 mg/m3 (LDE, LCB) or 6.5 mg/m3 (HDE, HCB) or to filtered air. The CB served as a surrogate for the elemental carbon matrix of DE soot. Considering both the mass fraction of solvent-extractable matter and its mutagenicity in the Ames Salmonella assay, the mutagenicity in revertants per unit particle mass of the CB was three orders of magnitude less than that of the DE soot. Both DE soot and CB particles accumulated progressively in the lungs of exposed rats, but the rate of accumulation was higher for DE soot. In general, DE and CB caused similar, dose-related, nonneoplastic lesions. CB and DE caused significant, exposure concentration-related increases, of similar magnitudes, in the incidences and prevalences of the same types of malignant and benign lung neoplasms in female rats. The incidences of neoplasms were much lower in males than females, and the mci dences were slightly higher among DE- than CB-exposed males. Survival was shortened in the CB-exposed males, and the short ened survival may have suppressed the expression of carcinoge nicity as measured by crude incidence. Logistic regression mod eling did not demonstrate significant differences between the carcinogenic potencies of CB and DE in either gender. The re sults suggest that the organic fraction of DE may not play an important role in the carcinogenicity of DE in rats.</div>
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<profileDesc><abstract><p>Diesel exhaust (DE) is a known pulmonary carcinogen in rats, and the carcinogenic response is known to require the presence of soot. Many estimates of human lung cancer risk from inhaled DE have been developed from rat bioassay data or from the comparative mutagenic potencies of DE soot extract and known human chemical carcinogens. To explore the importance of the DE soot-associated organic compounds in the lung tumor response of rats, male and female F344 rats were exposed chroni cally to diluted whole DE or aerosolized carbon black (CB) 16 hr/day, 5 days/week at target particle concentrations of 2.5 mg/m<hi rend="superscript">3</hi>
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<p>Diesel exhaust (DE) is a known pulmonary carcinogen in rats, and the carcinogenic response is known to require the presence of soot. Many estimates of human lung cancer risk from inhaled DE have been developed from rat bioassay data or from the comparative mutagenic potencies of DE soot extract and known human chemical carcinogens. To explore the importance of the DE soot-associated organic compounds in the lung tumor response of rats, male and female F344 rats were exposed chroni cally to diluted whole DE or aerosolized carbon black (CB) 16 hr/day, 5 days/week at target particle concentrations of 2.5 mg/m<sup>3</sup>
 (LDE, LCB) or 6.5 mg/m<sup>3</sup>
 (HDE, HCB) or to filtered air. The CB served as a surrogate for the elemental carbon matrix of DE soot. Considering both the mass fraction of solvent-extractable matter and its mutagenicity in the Ames <italic>Salmonella</italic>
 assay, the mutagenicity in revertants per unit particle mass of the CB was three orders of magnitude less than that of the DE soot. Both DE soot and CB particles accumulated progressively in the lungs of exposed rats, but the rate of accumulation was higher for DE soot. In general, DE and CB caused similar, dose-related, nonneoplastic lesions. CB and DE caused significant, exposure concentration-related increases, of similar magnitudes, in the incidences and prevalences of the same types of malignant and benign lung neoplasms in female rats. The incidences of neoplasms were much lower in males than females, and the mci dences were slightly higher among DE- than CB-exposed males. Survival was shortened in the CB-exposed males, and the short ened survival may have suppressed the expression of carcinoge nicity as measured by crude incidence. Logistic regression mod eling did not demonstrate significant differences between the carcinogenic potencies of CB and DE in either gender. The re sults suggest that the organic fraction of DE may not play an important role in the carcinogenicity of DE in rats.</p>

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Comparative Pulmonary Toxicities and Carcinogenicities of Chronically Inhaled Diesel Exhaust and Carban Black in F344 Rats

Comparative Pulmonary Toxicities and Carcinogenicities of Chronically Inhaled Diesel Exhaust and Carban Black in F344 Rats

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