期刊
MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS
卷 745, 期 1-2, 页码 65-72出版社
ELSEVIER
DOI: 10.1016/j.mrgentox.2012.02.002
关键词
Titanium dioxide nanoparticles; Phosphatidylinositol glycan class A gene; Flow cytometry; CD24; %MN-RET frequency; In vivo genotoxicity assays
资金
- Higher Education Commission (HEC), Pakistan
- CORES from the U.S. Food and Drug Administration
In vivo micronucleus and Pig-a (phosphatidylinositol glycan, class A gene) mutation assays were conducted to evaluate the genotoxicity of 10 nm titanium dioxide anatase nanoparticles (TiO2-NPs) in mice. Groups of five 6-7-week-old male B6C3F1 mice were treated intravenously for three consecutive days with 0.5, 5.0, and 50 mg/kg TiO2-NPs for the two assays: mouse blood was sampled one day before the treatment and on Day 4, and Weeks 1,2, 4, and 6 after the beginning of the treatment: Pig-a mutant frequencies were determined at Day -1 and Weeks 1, 2, 4 and 6, while percent micronucleated-reticulocyte (%MN-RET) frequencies were measured on Day 4 only. Additional animals were treated intravenously with three daily doses of 50 mg/kg TiO2-NPs for the measurement of titanium levels in bone marrow after 4, 24, and 48 h of the last treatment. The measurement indicated that the accumulation of the nanoparticles reached the peak in the tissue 4 h after the administration and the levels were maintained for a few days. No increase in either Pig-a mutant frequency or the frequency of %MN-RETs was detected, although the %RETs was reduced in the treated animals on Day 4 in a dose-dependent manner indicating cytotoxicity of TiO2-NPs in the bone marrow. These results suggest that although TiO2-NPs can reach the mouse bone marrow and are capable of inducing cytotoxicity, the nanoparticles are not genotoxic when assessed with in vivo micronucleus and Pig-a gene mutation tests. Published by Elsevier
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