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Abstract Tuberculosis remains a large global disease burden for which treatment regimens are protracted and monitoring of disease activity difficult. Existing detection methods rely almost exclusively on bacterial culture from sputum which limits sampling to organisms on the pulmonary surface. Advances in monitoring tuberculous lesions have utilized the common glucoside 18 FFDG, yet lack specificity to the causative pathogen Mycobacterium tuberculosis ( Mtb ) and so do not directly correlate with pathogen viability. Here we show that a close mimic that is also positron-emitting of the non-mammalian Mtb disaccharide trehalose – 2- 18 Ffluoro-2-deoxytrehalose ( 18 FFDT) – is a mechanism-based reporter of Mycobacteria-selective enzyme activity in vivo. Use of 18 FFDT in the imaging of Mtb in diverse models of disease, including non-human primates, successfully co-opts Mtb -mediated processing of trehalose to allow the specific imaging of TB-associated lesions and to monitor the effects of treatment. A pyrogen-free, direct enzyme-catalyzed process for its radiochemical synthesis allows the ready production of 18 FFDT from the most globally-abundant organic 18 F-containing molecule, 18 FFDG. The full, pre-clinical validation of both production method and 18 FFDT now creates a new, bacterium-selective candidate for clinical evaluation. We anticipate that this distributable technology to generate clinical-grade 18 FFDT directly from the widely-available clinical reagent 18 FFDG, without need for either custom-made radioisotope generation or specialist chemical methods and/or facilities, could now usher in global, democratized access to a TB-specific PET tracer.
Khan et al. (Thu,) studied this question.