Persistent Tissue Kinetics and Redistribution of Nanoparticles, Quantum Dot 705, in Mice: ICP-MS Quantitative Assessment

Yang, Raymond S.H. and Chang, Louis W. and Wu, Jui-Pin and Tsai, Ming-Hsien and Wang, Hsiu-Jen and Kuo, Yu-Chun and Yeh, Teng-Kuang and Yang, Chung Shi and Lin, Pinpin. (2007) Persistent Tissue Kinetics and Redistribution of Nanoparticles, Quantum Dot 705, in Mice: ICP-MS Quantitative Assessment. Environmental Health Perspectives, 115 (9). pp. 1339-1343. ISSN 0091-6765

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Background: Quantum dots (QDs) are autofluorescent semiconductor nanocrystals that can be used for in vivo biomedical imaging. However, we know little about their in vivo disposition and health consequences. Objectives: We assessed the tissue disposition and pharmacokinetics of QD705 in mice. Methods: We determined quantitatively the blood and tissue kinetics of QD705 in mice after single intravenous (iv) injection at the dose of 40 pmol for up to 28 days. Inductively coupled plasma–mass spectrometry (ICP-MS) measurement of cadmium was the primary method of quantification of QD705. Fluorescence light microscopy revealed the localization of QD705 in tissues. Results: Plasma half-life of QD705 in mice was short (18.5 hr), but ICP-MS analyses revealed QD705 persisted and even continued to increase in the spleen, liver, and kidney 28 days after an iv dose. Considerable time-dependent redistribution from body mass to liver and kidney was apparent between 1 and 28 days postdosing. The recoveries at both time points were near 100%; all QD705s reside in the body. Neither fecal nor urinary excretion of QD705 was detected appreciably in 28 days postdosing. Fluorescence microscopy demonstrated deposition of QD705 in the liver, spleen, and kidneys. Conclusion: Judging from the continued increase in the liver (29–42% of the administered dose), kidney (1.5–9.2%), and spleen (4.8–5.2%) between 1 and 28 days without any appreciable excretion, QD705 has a very long half-life, potentially weeks or even months, in the body and its health consequences deserve serious consideration.

Item Type: Article
Uncontrolled Keywords: ICP-MS, kinetics, nanoparticles, quantum dot 705, redistribution, mice, fluorescent quantum dots, cadmium
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanoparticles
Environment, Health, and Safety > Occupational Hygiene
Environment, Health, and Safety > Surveillance
Environment, Health, and Safety
Collections: Nanomanufacturing Research Collection
Related URLs:
Depositing User: Mr. Richard L Rosen
Date Deposited: 12 Jul 2010 18:38
Last Modified: 12 Jul 2010 18:39

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