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Nanomedicine (Lond). 2008 Oct;3(5):703-17. doi: 10.2217/17435889.3.5.703.

Clearance properties of nano-sized particles and molecules as imaging agents: considerations and caveats.

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1
Molecular Imaging Program, NCI/NIH Building 10, Bethesda, MD 20892-1088, USA.

Abstract

Nanoparticles possess enormous potential as diagnostic imaging agents and hold promise for the development of multimodality agents with both imaging and therapeutic capabilities. Yet, some of the most promising nanoparticles demonstrate prolonged tissue retention and contain heavy metals. This presents serious concerns for toxicity. The creation of nanoparticles with optimal clearance characteristics will minimize toxicity risks by reducing the duration of exposure to these agents. Given that many nanoparticles possess easily modifiable surface and interior chemistry, if nanoparticle characteristics associated with optimal clearance from the body were well established, it would be feasible to design and create agents with more favorable clearance properties. This article presents a thorough discussion of the physiologic aspects of nanoparticle clearance, focusing on renal mechanisms, and provides an overview of current research investigating clearance of specific types of nanoparticles and nano-sized macromolecules, including dendrimers, quantum dots, liposomes and carbon, gold and silica-based nanoparticles.

PMID:
18817471
PMCID:
PMC3407669
DOI:
10.2217/17435889.3.5.703
[Indexed for MEDLINE]
Free PMC Article
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