Imaging of a localized bacterial infection with endogenous thymidine kinase using radioisotope-labeled nucleosides
Abstract The importance of noninvasive imaging methods to bacterial infections is widely recognized. To obtain bacterial infection imaging with radioisotope-labeled nucleosides, bacterial thymidine kinase ( tk ) activities of Salmonella typhimurium with [125 I]5-iodo-1-(2′-fluoro-2′-deoxy-β- d -arab...
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Published in | International journal of medical microbiology Vol. 302; no. 2; pp. 101 - 107 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Germany
Elsevier GmbH
01.03.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Abstract The importance of noninvasive imaging methods to bacterial infections is widely recognized. To obtain bacterial infection imaging with radioisotope-labeled nucleosides, bacterial thymidine kinase ( tk ) activities of Salmonella typhimurium with [125 I]5-iodo-1-(2′-fluoro-2′-deoxy-β- d -arabinofuranosyl)uracil ([125 I]FIAU) or 3′-deoxy-3′-[18 F]fluorothymidine ([18 F]FLT) were measured. The infection model in BALB/c mice was imaged with [125 I]FIAU or [18 F]FLT using small-animal Single Photon Emission Computed Tomography (SPECT) or Positron Emission Tomography (PET), respectively. The accumulated radioactivity of [125 I]FIAU or [18 F]FLT in the two strains showed a linearly increased pattern with increasing incubation time or bacterial numbers. The image clearly demonstrated a high uptake of [125 I]FIAU and [18 F]FLT in the bacterial infection site. [18 F]FLT uptake in the infection site of was 7.286 ± 2.405, whereas that in the uninfected site was 0.519 ± 0.561. The relative activity ratio of the infected region in relation to the uninfected region was 2.98 at 4 h after an injection with [125 I]FIAU determined by biodistribution data. In conclusion, the bacterial tk activity was confirmed by the cellular uptake and imaging with [125 I]FIAU or [18 F]FLT. Therefore, a localized bacterial infection in living mice can be monitored using radioisotope-labeled nucleosides with a nuclear medicine imaging modality. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 1438-4221 1618-0607 |
DOI: | 10.1016/j.ijmm.2011.11.002 |