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In vivo detection of free radicals in mouse septic encephalopathy using molecular MRI and immuno-spin trapping.
- Source :
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Free radical biology & medicine [Free Radic Biol Med] 2013 Dec; Vol. 65, pp. 828-837. Date of Electronic Publication: 2013 Aug 23. - Publication Year :
- 2013
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Abstract
- Free radicals are known to play a major role in sepsis. Combined immuno-spin trapping and molecular magnetic resonance imaging (MRI) was used to detect in vivo and in situ levels of free radicals in murine septic encephalopathy after cecal ligation and puncture (CLP). DMPO (5,5-dimethyl pyrroline N-oxide) was injected over 6h after CLP, before administration of an anti-DMPO probe (anti-DMPO antibody bound to albumin-gadolinium-diethylene triamine pentaacetic acid-biotin MRI targeting contrast agent). In vitro assessment of the anti-DMPO probe in oxidatively stressed mouse astrocytes significantly decreased T1 relaxation (p < 0.0001) compared to controls. MRI detected the presence of anti-DMPO adducts via a substantial decrease in %T1 change within the hippocampus, striatum, occipital, and medial cortex brain regions (p < 0.01 for all) in septic animals compared to shams, which was sustained for over 60 min (p < 0.05 for all). Fluorescently labeled streptavidin was used to target the anti-DMPO probe biotin, which was elevated in septic brain, liver, and lungs compared to sham. Ex vivo DMPO adducts (qualitative) and oxidative products, including 4-hydroxynonenal and 3-nitrotyrosine (quantitative, p < 0.05 for both), were elevated in septic brains compared to shams. This is the first study that has reported on the detection of in vivo and in situ levels of free radicals in murine septic encephalopathy.<br /> (Copyright © 2013 Elsevier Inc. All rights reserved.)
- Subjects :
- Animals
Astrocytes metabolism
Brain metabolism
Cell Line
Cyclic N-Oxides
Magnetic Resonance Imaging
Male
Mice, Inbred C57BL
Oxidative Stress
Spin Labels
Spin Trapping
Tyrosine metabolism
Aldehydes metabolism
Free Radicals metabolism
Sepsis-Associated Encephalopathy metabolism
Tyrosine analogs & derivatives
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4596
- Volume :
- 65
- Database :
- MEDLINE
- Journal :
- Free radical biology & medicine
- Publication Type :
- Academic Journal
- Accession number :
- 23978375
- Full Text :
- https://doi.org/10.1016/j.freeradbiomed.2013.08.172