[18F]Amylovis as a Potential PET Probe for β-Amyloid Plaque: Synthesis, In Silico, In vitro and In vivo Evaluations

Author(s): Suchitil Rivera-Marrero, Laura Fernández-Maza, Samila León-Chaviano, Marquiza Sablón-Carrazana, Alberto Bencomo-Martínez, Alejandro Perera-Pintado, Anais Prats-Capote, Florencia Zoppolo, Ingrid Kreimerman, Tania Pardo, Laura Reyes, Marcin Balcerzyk, Geyla Dubed-Bandomo, Daymara Mercerón-Martínez, Luis A. Espinosa-Rodríguez, Henry Engler, Eduardo Savio*, Chryslaine Rodríguez-Tanty*.

Journal Name: Current Radiopharmaceuticals

Volume 12 , Issue 1 , 2019

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Abstract:

Background: Alzheimer’s disease (AD) is the most common form of dementia. Neuroimaging methods have widened the horizons for AD diagnosis and therapy. The goals of this work are the synthesis of 2-(3-fluoropropyl)-6-methoxynaphthalene (5) and its [18F]-radiolabeled counterpart ([18F]Amylovis), the in silico and in vitro comparative evaluations of [18F]Amylovis and [11C]Pittsburg compound B (PIB) and the in vivo preclinical evaluation of [18F]Amylovis in transgenic and wild mice.

Methods: Iron-catalysis cross coupling reaction, followed by fluorination and radiofluorination steps were carried out to obtain 5 and 18F-Amylovis. Protein/Aß plaques binding, biodistribution, PET/CT Imaging and immunohistochemical studies were conducted in healthy/transgenic mice.

Results: The synthesis of 5 was successful obtained. Comparative in silico studies predicting that 5 should have affinity to the Aβ-peptide, mainly through π-π interactions. According to a dynamic simulation study the ligand-Aβ peptide complexes are stable in simulation-time (ΔG = -5.31 kcal/mol). [18F]Amylovis was obtained with satisfactory yield, high radiochemical purity and specific activity. The [18F]Amylovis log Poct/PBS value suggests its potential ability for crossing the blood brain barrier (BBB). According to in vitro assays, [18F]Amylovis has an adequate stability in time. Higher affinity to Aβ plaques were found for [18F]Amylovis (Kd 0.16 nmol/L) than PIB (Kd 8.86 nmol/L) in brain serial sections of 3xTg-AD mice. Biodistribution in healthy mice showed that [18F]Amylovis crosses the BBB with rapid uptake (7 %ID/g at 5 min) and good washout (0.11±0.03 %ID/g at 60 min). Comparative PET dynamic studies of [18F]Amylovis in healthy and transgenic APPSwe/PS1dE9 mice, revealed a significant high uptake in the mice model.

Conclusion: The in silico, in vitro and in vivo results justify that [18F]Amylovis should be studied as a promissory PET imaging agent to detect the presence of Aβ senile plaques.

Keywords: Alzheimer's disease diagnosis, positron emission tomography, β-amyloid probe, fluorine-18, iron cross-coupling reaction, docking and dynamic simulations.

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Article Details

VOLUME: 12
ISSUE: 1
Year: 2019
Page: [58 - 71]
Pages: 14
DOI: 10.2174/1874471012666190102165053

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