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Open Access Green as soon as Postprint is submitted to ZB.
Negligible clearance of ultrafine particles retained in healthy and affected human lungs.
Eur. Respir. J. 28, 286-290 (2006)
Ambient particles are believed to be a specific health hazard, although the underlying mechanisms are not fully understood. There are data in the literature indicating fast and substantial systemic uptake of particles from the lung. The present authors have developed an improved method to produce ultrafine particles with more stable radiolabelling and defined particle size range. Fifteen subjects inhaled technetium 99m (99mTc)-labelled carbonaceous particles of 100 nm in size. Radioactivity over the lung was followed for 70 h. The clearance of these ultrafine particles from the lungs and specifically translocation to the circulation was tested. Lung retention for all subjects at 46 h was mean+/-sd 99+/-4.6%. Cumulative leaching of 99mTc activity from the particles was 2.6+/-0.96% at 70 h. The 24-h activity leaching in urine was 1.0+/-0.55%. No evidence of a quantitatively important translocation of 100-nm particles to the systemic circulation from the lungs was found. More research is needed to establish if the approximately 1% cleared activity originates from leached activity or insoluble translocated particles, and whether a few per cent of translocated particles is sufficient to cause harmful effects.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
air pollution; circulation; clearance; ultrafine particles
ISSN (print) / ISBN
0903-1936
e-ISSN
1399-3003
Journal
European Respiratory Journal
Quellenangaben
Volume: 28,
Issue: 2,
Pages: 286-290
Publisher
European Respiratory Society
Publishing Place
Sheffield
Reviewing status
Peer reviewed
Institute(s)
Institute of Lung Health and Immunity (LHI)