Comparative study of 18F-labeled PET radiopharmaceuticals in an Alzheimer's disease mouse model.

BACKGROUND

Alzheimer's disease (AD) is a progressive neurodegenerative disorder that is the leading cause of dementia, characterized by memory loss, cognitive decline, and significant social and economic burdens. Despite extensive research into amyloid positron emission tomography (PET) radiopharmaceuticals, the effectiveness of various 18F-labeled tracers for imaging amyloid plaques in AD mouse models remains uncertain. This study aimed to evaluate the performance of three radiopharmaceuticals-18F-florbetaben (FBB), 18F-flutemetamol (FMM), and 18F-florapronol (FPN)-in differentiating amyloid deposition in AD and control mice.

RESULTS

18F-FMM and 18F-FBB demonstrated significantly higher standardized uptake value ratios (SUVRs) in AD mice than in controls. For 18F-FBB, the mean SUVR in AD mice was 1.06, significantly higher than the 0.81 in controls (p < 0.001). Similarly, 18F-FMM showed a mean SUVR of 0.97 in AD mice compared to 0.94 in controls (p = 0.024). In contrast, 18F-FPN did not show significant SUVR differences between AD and control groups (p = 0.071). Comparative analysis revealed that 18F-FBB exhibited a significantly greater SUVR difference between AD and control groups compared to 18F-FMM (p < 0.001).

CONCLUSIONS

18F-FBB emerged as the most effective radiopharmaceutical for imaging amyloid deposition in AD mouse models, providing superior differentiation between AD and control groups. These findings support the optimization of amyloid PET tracers for preclinical studies, facilitating advancements in Alzheimer's research.

CLINICAL TRIAL NUMBER: Not applicable.