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| Hauptseite > Publikationsdatenbank > SV2A-PET in a tauopathy mouse model |
| Hauptseite > Publikationsdatenbank > SV2A-PET in a tauopathy mouse model |
| Conference Presentation (After Call) | FZJ-2024-04027 |
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2023
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Please use a persistent id in citations: doi:10.1055/s-0043-1766342
Abstract: Ziel/Aim Transgenic mouse models are frequently used to study the mechanismsof neurodegenerative diseases and possible therapeutic options. Weinvestigated the tauopathy mouse model TauRDΔK, which expresses the repeatdomain of human tau with deletion of the amino acid K280. TauRDΔK mice showa slow disease progression which makes them a suitable model for therapystudies. Unexpectedly, the PET tracer [18F]MNI-1126, which binds to the synapticvesicle protein SV2A, showed a significantly increased uptake in the brainof 16–18 months old TauRDΔK mice in the summed image analysis (n = 9; SUVRCer0.98 ± 0.03) compared to controls (n = 7; SUVRCer: 0.94 ± 0.02; p < 0.005).This is in contrast to studies with other tauopathy mouse models, which alldemonstrated reduced SV2A binding.Methodik/Methods To further investigate this surprising result, we performedkinetic modeling using the simplified reference tissue model in PMOD with thecerebellum as reference region as well as Western blot.Ergebnisse/Results The whole brain non-displaceable binding potential(BPnd) was significantly higher in TauRDΔK mice (0.24 ± 0.03) compared to controls(0.18 ± 0.06; p = 0.0276). This was confirmed by globally increased SV2A/actin ratio in Western blot (0.98 ± 0.24 in TauRDΔK mice versus 0.84 ± 0.11 incontrols). Voxel-wise comparison of BPnd revealed a wide-spead significantincrease of BPnd mirroring the elevated SUVRCer. Whole brain ratio of tracerdelivery R1 ( = K1/K1') was comparable in TauRDΔK mice (0.98 ± 0.04) and controls(0.94 ± 0.1; p = 0.2930). The efflux constant k2 was slightly lower inTauRDΔK mice (0.07 ± 0.02 1/ml) compared to controls (0.08 ± 0.03 1/ml), butnot statistically significant (p = 0.5432).Schlussfolgerungen/Conclusions Our results demonstrate that SV2A expressionwas globally increased in TauRDΔK mice. It is unlikely that this reflects synapticsprouting or a compensatory increase of synaptic vesicles, since a previousstudy has demonstrated a decline of synapsin expression as well as synapticdensity from 9 months of age. One possible explanation could be the increaseof mitochondrial SV2A expression, which will be evaluated in further studies.
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