Home > Publications database > Preparation and Preclinical Evaluation of 18F-Labeled Olutasidenib Derivatives for Non-Invasive Detection of Mutated Isocitrate Dehydrogenase 1 (mIDH1) > print

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024 7 _ |a 10.3390/molecules29163939
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100 1 _ |a Cologni, Roberta
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245 _ _ |a Preparation and Preclinical Evaluation of 18F-Labeled Olutasidenib Derivatives for Non-Invasive Detection of Mutated Isocitrate Dehydrogenase 1 (mIDH1)
260 _ _ |a Basel
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500 _ _ |a This research was funded by Deutsche Forschungsgemeinschaft (DFG), grant number NE 890/9-1, and by the Helmholtz European Partnering program (‘Innovative high-performance computing approaches for molecular neuromedicine’).
520 _ _ |a Mutations of isocitrate dehydrogenase 1 (IDH1) are key biomarkers for glioma classification, but current methods for detection of mutated IDH1 (mIDH1) require invasive tissue sampling and cannot be used for longitudinal studies. Positron emission tomography (PET) imaging with mIDH1-selective radioligands is a promising alternative approach that could enable non-invasive assessment of the IDH status. In the present work, we developed efficient protocols for the preparation of four 18F-labeled derivatives of the mIDH1-selective inhibitor olutasidenib. All four probes were characterized by cellular uptake studies with U87 glioma cells harboring a heterozygous IDH1 mutation (U87-mIDH) and the corresponding wildtype cells (U87-WT). In addition, the most promising probe was evaluated by PET imaging in healthy mice and mice bearing subcutaneous U87-mIDH and U87-WT tumors. Although all four probes inhibited mIDH1 with variable potencies, only one of them ([18F]mIDH-138) showed significantly higher in vitro uptake into U87-mIDH compared to U87-WT cells. In addition, PET imaging with [18F]mIDH-138 in mice demonstrated good in vivo stability and low non-specific uptake of the probe, but also revealed significantly higher uptake into U87-WT compared to U87-mIDH tumors. Finally, application of a two-tissue compartment model (2TCM) to the PET data indicated that preferential tracer uptake into U87-WT tumors results from higher specific binding rather than from differences in tracer perfusion. In conclusion, these results corroborate recent findings that mIDH1-selective inhibition may not directly correlate with mIDH1-selective target engagement and indicate that in vivo engagement of wildtype and mutated IDH1 may be governed by factors that are not faithfully reproduced by in vitro assays, both of which could complicate development of PET probes.
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700 1 _ |a Holschbach, Marcus
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700 1 _ |a Schneider, Daniela
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700 1 _ |a Bier, Dirk
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700 1 _ |a Schulze, Annette
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700 1 _ |a Stegmayr, Carina
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700 1 _ |a Endepols, Heike
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700 1 _ |a Ermert, Johannes
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700 1 _ |a Neumaier, Felix
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700 1 _ |a Neumaier, Bernd
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773 _ _ |a 10.3390/molecules29163939
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