Ex vivo magnetic particle imaging of vascular inflammation in abdominal aortic aneurysm in a murine model.
Angiotensin II
/ toxicity
Animals
Aorta, Abdominal
/ diagnostic imaging
Aortic Aneurysm, Abdominal
/ chemically induced
Disease Models, Animal
Disease Progression
Feasibility Studies
Humans
Inflammation
Magnetic Iron Oxide Nanoparticles
/ administration & dosage
Magnetic Resonance Angiography
/ methods
Magnetic Resonance Imaging
Magnetic Resonance Spectroscopy
/ methods
Male
Mice
Mice, Knockout, ApoE
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
24 07 2020
24 07 2020
Historique:
received:
05
05
2020
accepted:
26
06
2020
entrez:
26
7
2020
pubmed:
28
7
2020
medline:
22
12
2020
Statut:
epublish
Résumé
Abdominal aortic aneurysms (AAAs) are currently one of the leading causes of death in developed countries. Inflammation is crucial in the disease progression, having a substantial impact on various determinants in AAAs development. Magnetic particle imaging (MPI) is an innovative imaging modality, enabling the highly sensitive detection of magnetic nanoparticles (MNPs), suitable as surrogate marker for molecular targeting of vascular inflammation. For this study, Apolipoprotein E-deficient-mice underwent surgical implantation of osmotic minipumps with constant Angiotensin II infusion. After 3 and 4 weeks respectively, in-vivo-magnetic resonance imaging (MRI), ex-vivo-MPI and ex-vivo-magnetic particle spectroscopy (MPS) were performed. The results were validated by histological analysis, immunohistology and laser ablation-inductively coupled plasma-mass spectrometry. MR-angiography enabled the visualization of aneurysmal development and dilatation in the experimental group. A close correlation (R = 0.87) with histological area assessment was measured. Ex-vivo-MPS revealed abundant iron deposits in AAA samples and ex-vivo histopathology measurements were in good agreement (R = 0.76). Ex-vivo-MPI and MPS results correlated greatly (R = 0.99). CD68-immunohistology stain and Perls'-Prussian-Blue-stain confirmed the colocalization of macrophages and MNPs. This study demonstrates the feasibility of ex-vivo-MPI for detecting inflammation in AAA. The quantitative ability for mapping MNPs establishes MPI as a promising tool for monitoring inflammatory progression in AAA in an experimental setting.
Identifiants
pubmed: 32709967
doi: 10.1038/s41598-020-69299-y
pii: 10.1038/s41598-020-69299-y
pmc: PMC7381631
doi:
Substances chimiques
Angiotensin II
11128-99-7
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
12410Références
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