Abstract
Most frequently, gram-negative bacterial infections in humans are caused by Enterobacteriaceae and remain a major challenge in medical diagnostics. We non-invasively imaged moderate and severe systemic Yersinia enterocolitica infections in mice using the positron emission tomography (PET) tracer 3’-deoxy-3’-[18F]fluorothymidine ([18F]FLT), which is a marker of proliferation, and compared the in vivo results to the ex vivo biodistributions, bacterial loads, and histologies of the corresponding organs. Y. enterocolitica infection is detectable with histology using H&E staining and immunohistochemistry for Ki 67. [18F]FLT revealed only background uptake in the spleen, which is the main manifestation site of systemic Y. enterocolitica-infected mice. The uptake was independent of the infection dose. Antibody-based thymidine kinase 1 (Tk-1) staining confirmed the negative [18F]FLT-PET data. Histological alterations of spleen tissue, observed via Ki 67-antibody-based staining, can not be detected by [18F]FLT-PET in this model. Thus, the proliferation marker [18F]FLT is not a suitable tracer for the diagnosis of systemic Y. enterocolitica infection in the C57BL/6 animal model of yersiniosis.
Highlights
Molecular imaging with positron emission tomography (PET) allows for the determination of the metabolic and functional parameters of living cells [1] and has emerged as a rapid, noninvasive and highly sensitive approach to identify sites of infection and inflammation more
All animal procedures were performed according to protocols that were approved by the Regierungspräsidium Tübingen (Permit Number: IZ1/10) as per guidelines from the European Health Law of the Federation of Laboratory Animal Science Associations (FELASA)
As we demonstrated in a previous study, the bacteria mainly localize to the spleen, liver, lung and bone marrow upon systemic infection in mice, [28]
Summary
The aim of this study was to evaluate the suitability of [18F]FLT for its use in the detection of a Ye induced inflammation
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