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In vivo visualization of single native pancreatic islets in the mouse.
MedLine Citation:
PMID:  24375905     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The purpose of this study was to investigate the potential of a novel targeted contrast agent (CA) for the in vivo visualization of single native pancreatic islets, the sites of insulin production, in the pancreas of mice using magnetic resonance imaging (MRI). The CA for intravenous administration was composed of the β-cell-specific single-chain antibody fragment, SCA B1, and ferromagnetic carbon-coated cobalt nanoparticles. MRI experiments were performed at 7, 9.4 and 16.4 T in excised organs (pancreas, liver, kidney, spleen), at 7 T in mice fixed in formalin and at 9.4 and 16.4 T in living mice. Image contrast in untreated control animals was compared with images from mice treated with unspecific and specific CA. For the validation of MRI results, selected pancreases were subjected to immunohistochemical staining and numerical contrast simulations were performed. Ex vivo results and the outcome of immunohistochemistry suggest that islets are marked only by the CA containing SCA B1. Strong accumulation of particles was found also in other investigated organs owing to the uptake by the reticuloendothelial system, but the contrast in the MR images is clearly distinguishable from the islet specific contrast in pancreases and numerical predictions. In vivo experiments based on averaged dynamic sampling with 66 × 66 × 100 µm(3) and triggered acquisition with 90 × 90 × 200 µm(3) nominal resolution resulted in similar particle contrast to in in vitro measurements. The newly developed CA and MRI strategies have the potential to be used for studying mouse diabetes models by visualizing single native pancreatic islets. Copyright © 2013 John Wiley & Sons, Ltd.
Authors:
Dávid Z Balla; Sven Gottschalk; G Shajan; Sandra Ueberberg; Stephan Schneider; Matthias Hardtke-Wolenski; Elmar Jaeckel; Verena Hoerr; Cornelius Faber; Klaus Scheffler; Rolf Pohmann; Jörn Engelmann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Contrast media & molecular imaging     Volume:  8     ISSN:  1555-4317     ISO Abbreviation:  Contrast Media Mol Imaging     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-12-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101286760     Medline TA:  Contrast Media Mol Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  495-504     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 John Wiley & Sons, Ltd.
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