Lung retention and particokinetics of silver and gold nanoparticles in rats following subacute inhalation co-exposure
- Title
- Lung retention and particokinetics of silver and gold nanoparticles in rats following subacute inhalation co-exposure
- Author
- 안강호
- Keywords
- Gold nanoparticles; Silver nanoparticles; Subacute inhalation exposure; Co-exposure; Particokinetics; Toxicokinetics; Lung retention
- Issue Date
- 2021-01
- Publisher
- BMC
- Citation
- PARTICLE AND FIBRE TOXICOLOGY, v. 18, NO 1, Page. 1-12
- Abstract
- Background: Inhalation exposure to nanomaterials in workplaces can include a mixture of multiple nanoparticles.
Such ambient nanoparticles can be of high dissolution or low dissolution in vivo and we wished to determine
whether co-exposure to particles with different dissolution rates affects their biokinetics.
Methods and Results: Rats were exposed to biosoluble silver nanoparticles (AgNPs, 10.86 nm) and to biopersistent gold
nanoparticles (AuNPs, 10.82 nm) for 28 days (6-h/day, 5-days/week for 4 weeks) either with separate NP inhalation
exposures or with combined co-exposure. The separate NPs mass concentrations estimated by the differential mobility
analyzer system (DMAS) were determined to be 17.68 ± 1.69 μg/m3 for AuNP and 10.12 ± 0.71 μg/m3 for AgNP. In
addition, mass concentrations analyzed by atomic absorption spectrometer (AAS) via filter sampling were for AuNP
19.34 ± 2.55 μg/m3 and AgNP 17.38 ± 1.88 μg/m3 for separate exposure and AuNP 8.20 ± 1.05 μg/m3 and AgNP 8.99 ±
1.77 μg/m3 for co-exposure. Lung retention and clearance were determined on day 1 (6-h) of exposure (E-1) and on postexposure days 1, 7, and 28 (PEO-1, PEO-7, and PEO-28, respectively). While the AgNP and AuNP deposition rates were
determined to be similar due to the similarity of NP size of both aerosols, the retention half-times and clearance rates
differed due to the difference in dissolution rates. Thus, when comparing the lung burdens following separate exposures,
the AgNP retention was 10 times less than the AuNP retention at 6-h (E-1), and 69, 89, and 121 times lower less than the
AuNP retention at PEO-1, PEO-7, and PEO-28, respectively. In the case of AuNP+AgNP co-exposure, the retained AgNP
lung burden was 14 times less than the retained AuNP lung burden at E-1, and 26, 43, and 55 times less than the
retained AuNP lung burden at PEO-1, PEO-7, and PEO-28, respectively. The retention of AuNP was not affected by the
presence of AgNP, but AgNP retention was influenced in the presence of AuNP starting at 24 h after the first day of post
day of exposure. The clearance of AgNPs of the separate exposure showed 2 phases; fast (T1/2 3.1 days) and slow (T1/2
48.5 days), while the clearance of AuNPs only showed one phase (T1/2 .81.5 days). For the co-exposure of AuNPs+AgNPs,
the clearance of AgNPs also showed 2 phases; fast (T1/2 2.2 days) and slow (T1/2 28.4 days), while the clearance of AuNPs
consistently showed one phase (T1/2 54.2 days). The percentage of Ag lung burden in the fast and slow clearing lung
compartment was different between separate and combined exposure. For the combined exposure, the slow and fast compartments were each 50% of the lung burden. For the single exposure, 1/3 of the lung burden was cleared by the
fast rate and 2/3 of the lung burden by the slow rate.
Conclusions: The clearance of AgNPs follows a two- phase model of fast and slow dissolution rates while the clearance
of AuNPs could be described by a one- phase model with a longer half-time. The co-exposure of AuNPs+AgNPs showed
that the clearance of AgNPs was altered by the presence of AuNPs perhaps due to some interaction between AgNP and
AuNP affecting dissolution and/or mechanical clearance of AgNP in vivo.
- URI
- https://www.proquest.com/docview/2491336628?accountid=11283https://repository.hanyang.ac.kr/handle/20.500.11754/172294
- ISSN
- 17438977
- DOI
- 10.1186/s12989-021-00397-z
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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