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      1. Author :
        Hertlein, T.; Sturm, V.; Kircher, S.; Basse-Lusebrink, T.; Haddad, D.; Ohlsen, K.; Jakob, P.
      2. Title :
      3. Type :
        Journal Article
      4. Year :
      5. Publication :
        PLoS One
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      10. Research Area :
      11. Keywords :
        IVIS, Xen29, Xen 29, Staphylococcus aureus Xen29, Animals; Female; Magnetic Resonance Imaging/*methods; Mice; Mice, Inbred BALB C; Staphylococcal Infections/*pathology; Staphylococcus aureus/*pathogenicity; Thigh/*microbiology/*pathology
      12. Abstract :
        BACKGROUND: During the last years, (19)F-MRI and perfluorocarbon nanoemulsion (PFC) emerged as a powerful contrast agent based MRI methodology to track cells and to visualize inflammation. We applied this new modality to visualize deep tissue abscesses during acute and chronic phase of inflammation caused by Staphylococcus aureus infection. METHODOLOGY AND PRINCIPAL FINDINGS: In this study, a murine thigh infection model was used to induce abscess formation and PFC or CLIO (cross linked ironoxides) was administered during acute or chronic phase of inflammation. 24 h after inoculation, the contrast agent accumulation was imaged at the site of infection by MRI. Measurements revealed a strong accumulation of PFC at the abscess rim at acute and chronic phase of infection. The pattern was similar to CLIO accumulation at chronic phase and formed a hollow sphere around the edema area. Histology revealed strong influx of neutrophils at the site of infection and to a smaller extend macrophages during acute phase and strong influx of macrophages at chronic phase of inflammation. CONCLUSION AND SIGNIFICANCE: We introduce (19)F-MRI in combination with PFC nanoemulsions as a new platform to visualize abscess formation in a murine thigh infection model of S. aureus. The possibility to track immune cells in vivo by this modality offers new opportunities to investigate host immune response, the efficacy of antibacterial therapies and the influence of virulence factors for pathogenesis.
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      14. Call Number :
        PKI @ kd.modi @ 2
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