Comparative pulmonary toxicity of a DWCNT and MWCNT-7 in rats.

Comparative pulmonary toxicity of a DWCNT and MWCNT-7 in rats. Arch Toxicol. 2018 Oct 19;: Authors: El-Gazzar AM, Abdelgied M, Alexander DB, Alexander WT, Numano T, Iigo M, Naiki A, Takahashi S, Takase H, Hirose A, Kannno J, Elokle OS, Nazem AM, Tsuda H Abstract Very little is known about the in vivo toxicity of inhaled double-walled carbon nanotubes (DWCNTs). In the present study, we compared the pulmonary toxicity of DWCNT to MWCNT-7, a well-known multi-walled carbon nanotube. Rats were divided into six groups: untreated, vehicle, low-dose DWCNT, high-dose DWCNT, low-dose MWCNT-7, and high-dose MWCNT-7. The test materials were administered by intra-tracheal intra-pulmonary spraying (TIPS) every other day for 15 days: the low-dose and high-dose groups were administered final total doses of 0.25 and 0.50 mg/rat of the test material. The animals were sacrificed 1 and 6 weeks after the final TIPS administration. Six weeks after the final TIPS administration, rats administered MWCNT-7 had high levels of macrophage infiltration into the lung with dense alveolar wall fibrous thickening throughout the lung; significant elevation of lactate dehydrogenase activity, alkaline phosphatase activity, and total protein concentration in the bronchioalveolar lavage fluid; an increase in the pulmonary cell PCNA index; slightly elevated levels of 8-OHdG DNA adducts in lung tissue DNA; a small but significant increase in protein concentration in the...
Source: Archives of Toxicology - Category: Toxicology Authors: Tags: Arch Toxicol Source Type: research