Migration of Intradermally Injected Quantum Dots to Sentinel Organs in Mice

Topical exposure to nanoscale materials is likely from a variety of sources including sunscreens and cosmetics. Because the in vivo disposition of nanoscale materials is not well understood, we have evaluated the distribution of quantum dots (QDs) following intradermal injection into female SKH-1 ha...

Full description

Saved in:
Bibliographic Details
Published in:Toxicological sciences 2007-07, Vol.98 (1), p.249-257
Main Authors: Gopee, Neera V., Roberts, Dean W., Webb, Peggy, Cozart, Christy R., Siitonen, Paul H., Warbritton, Alan R., Yu, William W., Colvin, Vicki L., Walker, Nigel J., Howard, Paul C.
Format: Article
Language:English
Subjects:
Animals
biodistribution
Cadmium - administration & dosage
Cadmium - pharmacokinetics
Female
Injections, Intradermal
Mass Spectrometry
Mice
Mice, Hairless
Microscopy, Fluorescence
nanoparticles
nanoscale materials
Quantum Dots
Selenium - administration & dosage
Selenium - pharmacokinetics
sentinel organs
Solubility
Spectrophotometry, Ultraviolet
Spectroscopy, Near-Infrared
Tissue Distribution
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Topical exposure to nanoscale materials is likely from a variety of sources including sunscreens and cosmetics. Because the in vivo disposition of nanoscale materials is not well understood, we have evaluated the distribution of quantum dots (QDs) following intradermal injection into female SKH-1 hairless mice as a model system for determining tissue localization following intradermal infiltration. The QD (CdSe core, CdS capped, poly[ethylene glycol] coated, 37 nm diameter, 621 nm fluorescence emission) were injected intradermally (ID) on the right dorsal flank. Within minutes following intradermal injection, the highly UV fluorescent QD could be observed moving from the injection sites apparently through the lymphatic duct system to regional lymph nodes. Residual fluorescent QD remained at the site of injection until necropsy at 24 h. Quantification of cadmium and selenium levels after 0, 4, 8, 12, or 24 h in multiple tissues, using inductively coupled plasma mass spectrometry (ICP-MS), showed a time-dependent loss of cadmium from the injection site, and accumulation in the liver, regional draining lymph nodes, kidney, spleen, and hepatic lymph node. Fluorescence microscopy corroborated the ICP-MS results regarding the tissue distribution of QD. The results indicated that (1) ID injected nanoscale QD remained as a deposit in skin and penetrated the surrounding viable subcutis, (2) QD were distributed to draining lymph nodes through the sc lymphatics and to the liver and other organs, and (3) sentinel organs are effective locations for monitoring transdermal penetration of nanoscale materials into animals.
ISSN:1096-6080
1096-0929
DOI:10.1093/toxsci/kfm074