Journal
INTERNATIONAL JOURNAL OF NANOMEDICINE
Volume 5, Issue -, Pages 771-781Publisher
DOVE MEDICAL PRESS LTD
DOI: 10.2147/IJN.S8428
Keywords
gold nanoparticles; in vivo; toxicity
Funding
- National Natural Science Foundation of China [81000668]
- Higher Education State Education Ministry [200800231058]
- Subject Development Foundation of the Institute of Radiation Medicine, CAMS [SF1003, SF0826]
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Gold nanoparticles have potential applications in biomedicine, but one of the important concerns is about their safety. Most toxicology data are derived from in vitro studies and may not reflect in vivo responses. Here, an animal toxicity study of 13.5 nm gold nanoparticles in mice is presented. Animal survival, weight, hematology, morphology, and organ index are characterized at different concentrations (137.5-2200 mu g/kg) over 14-28 days. The results show that low concentrations of gold nanoparticles do not cause an obvious decrease in body weight or appreciable toxicity, even after their breakdown in vivo. High concentrations of gold nanoparticles induced decreases in body weight, red blood cells, and hematocrit. It was also found that gold nanoparticles administered orally caused significant decreases in body weight, spleen index, and red blood cells. Of the three administration routes, the oral and intraperitoneal routes showed the highest toxicity, and the tail vein injection showed the lowest toxicity. Combining the results of all of these studies, we suggest that targeted gold nanopartices by tail vein injection may be suitable for enhancement of radiotherapy, photothermal therapy, and related medical diagnostic procedures.
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