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Open Access Green as soon as Postprint is submitted to ZB.
Air-blood barrier translocation of tracheally instilled gold nanoparticles inversely depends on particle size.
ACS Nano 8, 222-233 (2014)
Gold nanoparticles (AuNP) provide many opportunities in imaging, diagnostics, and therapy in nanomedicine. For the assessment of AuNP biokinetics, we intratracheally instilled into rats a suite of 198Au-radio-labeled monodisperse, well-characterized, negatively charged AuNP of five different sizes (1.4, 2.8, 5, 18, 80, 200 nm) and 2.8 nm AuNP with positive surface charges. At 1, 3, and 24 h, the biodistribution of the AuNP was quantitatively measured by gamma-spectrometry to be used for comprehensive risk assessment. Our study shows that as AuNP get smaller, they are more likely to cross the air-blood barrier (ABB) depending strongly on the inverse diameter d-1 of their gold core, i.e., their specific surface area (SSA). So, 1.4 nm AuNP (highest SSA) translocated most, while 80 nm AuNP (lowest SSA) translocated least, but 200 nm particles did not follow the d -1 relation translocating significantly higher than 80 nm AuNP. However, relative to the AuNP that had crossed the ABB, their retention in most of the secondary organs and tissues was SSA-independent. Only renal filtration, retention in blood, and excretion via urine further declined with d-1 of AuNP core. Translocation of 5, 18, and 80 nm AuNP is virtually complete after 1 h, while 1.4 nm AuNP continue to translocate until 3 h. Translocation of negatively charged 2.8 nm AuNP was significantly higher than for positively charged 2.8 nm AuNP. Our study shows that translocation across the ABB and accumulation and retention in secondary organs and tissues are two distinct processes, both depending specifically on particle characteristics such as SSA and surface charge.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
198au Radiolabel ; Female Wystar-kyoto Rat ; Gold Nanoparticles ; In Vivo Biodistribution ; Intratracheal Instillation ; Nanoparticle Surface Charge ; Specific Surface Area ; Translocation; Cellular Uptake; Rat Lung; Intratracheal Instillation; Glomerular-permeability; Drug-delivery; Biodistribution; Toxicity; Clearance; Internalization; Nanomedicine
ISSN (print) / ISBN
1936-0851
e-ISSN
1936-086X
Journal
ACS Nano
Quellenangaben
Volume: 8,
Issue: 1,
Pages: 222-233
Publisher
American Chemical Society (ACS)
Publishing Place
Washington
Non-patent literature
Publications
Reviewing status
Peer reviewed