Радиационная дозиметрия 18 кДа транслокаторного белкового лиганда [18F]PBR111 у людей.
Обработка статьи · этапы, ошибки и управление
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Tournier Benjamin B, Mansouri Zahra, Salimi Yazdan, Ceyzériat Kelly, Mathoux Gregory, Richard-Lepouriel Hélène, Zullino Daniele, Bois Frédéric, Zaidi Habib, Garibotto Valentina, Tsartsalis Stergios, Millet Philippe
Аннотация
Оригинал публикации
Radiation dosimetry of the 18 kDa translocator protein ligand [18F]PBR111 in humans.
PURPOSE: The 18 kDa translocator protein (TSPO) is a mitochondrial protein that becomes overexpressed during neuroinflammatory conditions, such as in Alzheimer's disease or multiple sclerosis. TSPO is of interest because it serves as a marker for microglial and astrocytic activity, measurable via in vivo positron emission tomography (PET) molecular imaging. [18F]PBR111 is a second-generation TSPO PET radioligand with high signal specificity but a sensitivity to TSPO polymorphism, in comparison with first-generation ligands. This study focused on the biodistribution and dosimetry of [18F]PBR111 in healthy humans.
METHOD: Six volunteers (three males, three females) were administered approximately 200 MBq of [18F]PBR111. Organs such as the lungs and liver showed the highest initial radioactivity level, while the bone marrow and bladder accumulated activity over time, likely reflecting ligand defluorination and elimination.
RESULTS: Dosimetry findings revealed a total effective dose of 16.17 μSv/MBq, equivalent to 3.04 mSv per examination. Compared to animal models, human dosimetry showed lower radiation exposure, highlighting discrepancies in predictive models. Organ-specific dose comparisons with other TSPO ligands ([18F]PBR06, [18F]FEPPA, [18F]FEDAA1106) revealed similar distribution patterns. This study underscores the clinical viability of [18F]PBR111 for TSPO imaging, providing critical data for optimizing its safe use in research and clinical settings.
CONCLUSION: The findings support its potential for studying neuroinflammatory and systemic diseases. The trial registration number is NCT06398392.