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Journal article
Targeted Gold Nanoparticles as an Indicator of Mechanical Damage in an Elastase Model of Aortic Aneurysm
Annals of biomedical engineering, v 48(8), pp 2268-2278
01 Aug 2020
PMID: 32240423
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Abstract
Elastin is a key structural protein and its pathological degradation deterministic in aortic aneurysm (AA) outcomes. Unfortunately, using current diagnostic and clinical surveillance techniques the integrity of the elastic fiber network can only be assessed invasively. To address this, we employed fragmented elastin-targeting gold nanoparticles (EL-AuNPs) as a diagnostic tool for the evaluation of unruptured AAs. Electron dense EL-AuNPs were visualized within AAs using micro-computed tomography (micro-CT) and the corresponding Gold-to-Tissue volume ratios quantified. The Gold-to-Tissue volume ratios correlated strongly with the concentration (0, 0.5, or 10 U/mL) of infused porcine pancreatic elastase and therefore the degree of elastin damage. Hyperspectral mapping confirmed the spatial targeting of the EL-AuNPs to the sites of damaged elastin. Nonparametric Spearman’s rank correlation indicated that the micro-CT-based Gold-to-Tissue volume ratios had a strong correlation with loaded (
ρ
= 0.867,
p
-val = 0.015) and unloaded (
ρ
= 0.830,
p
-val = 0.005) vessel diameter, percent dilation (
ρ
= 0.976,
p
-val = 0.015), circumferential stress (
ρ
= 0.673,
p
-val = 0.007), loaded (
ρ
= − 0.673,
p
-val = 0.017) and unloaded (
ρ
= − 0.697,
p
-val = 0.031) wall thicknesses, circumferential stretch (
ρ
= − 0.7234,
p
-val = 0.018), and lumen area compliance (
ρ
= − 0.831,
p
-val = 0.003). Likewise, in terms of axial force and axial stress vs. stretch, the post-elastase vessels were stiffer. Collectively, these findings suggest that, when combined with CT imaging, EL-AuNPs can be used as a powerful tool in the non-destructive estimation of mechanical and geometric features of AAs.
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Details
- Title
- Targeted Gold Nanoparticles as an Indicator of Mechanical Damage in an Elastase Model of Aortic Aneurysm
- Creators
- Brooks A. Lane - University of South CarolinaXiaoying Wang - Clemson UniversitySusan M. Lessner - University of South CarolinaNaren R. Vyavahare - Clemson UniversityJohn F. Eberth - University of South Carolina
- Publication Details
- Annals of biomedical engineering, v 48(8), pp 2268-2278
- Publisher
- Springer International Publishing
- Number of pages
- 11
- Grant note
- R01HL133662; R01HL145064 / National Institutes of Health (http://dx.doi.org/10.13039/100000002) CMMI-1760906 / National Science Foundation (http://dx.doi.org/10.13039/100000001)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000523379400001
- Scopus ID
- 2-s2.0-85082802435
- Other Identifier
- 991021902499404721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Biomedical