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Data Publication: Structure-Based Design, Optimization and Development of [18F]LU13, a novel radioligand for CB2R Imaging in the Brain with PET

Moldovan, Rares-Petru; Gündel, Daniel; Deuther-Conrad, Winnie; Ueberham, Lea; Kaur, Sarandeep; Otikova, Elina; Teodoro, Rodrigo; Lai, Thu Hang; Clauß, Oliver; Scheunemann, Matthias; Bormans, Guy; Kopka, Klaus; Bachmann, Michael; Brust, Peter


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    "description": "<p>The cannabinoid receptor type 2 (CB2R) is an attractive target for diagnosis and therapy of neurodegenerative diseases and cancer. Recently, we reported a novel naphthyrid-2-one based positron-emission tomography (PET) radioligand for imaging of the CB2R in the brain (<strong>[<sup>18</sup>F]5</strong>). In this study we aimed at the development of a novel <sup>18</sup>F-labeled CB2R radioligand with improved binding properties and metabolic stability. Starting from the structure of <strong>5</strong>, we developed a novel series of fluorinated derivatives by modifying the substituents at the naphthyrid-2-one subunit. Compound <strong>28</strong> (<strong>LU13</strong>) was identified with the highest binding affinity and selectivity versus CB1R (CB2R<em>K</em><sub>i</sub> = 0.6 nM; CB1R<em>K</em><sub>i</sub>/CB2R<em>K</em><sub>i</sub> &gt; 1000) and was selected for radiolabeling with <sup>18</sup>F and biological characterization. The radiofluorination was performed starting from the corresponding bromo-precursor (<strong>31</strong>) bearing a fully deuterated <em>N</em>-alkyl chain to protect against defluorination. The in vitro evaluation of <strong>[<sup>18</sup>F]LU13 </strong>proved the high binding affinity of the radioligand towards rat (rCB2R<em>K</em><sub>D</sub> = 0.2 nM) and human (hCB2R<em>K</em><sub>D</sub> = 1.1 nM) CB2R. Metabolism studies in mice revealed a metabolic stability at 30 min p.i. with fractions of parent compound of &gt;80% in the brain and 90% in the spleen with only trace of defluorination products detected in plasma. PET imaging in a rat model of vector-based/related overexpression in the striatum revealed a high signal to background ratio, demonstrating the ability of <strong>[<sup>18</sup>F]LU13</strong> to reach and selectively label the hCB2R in the brain. Thus, <strong>[<sup>18</sup>F]LU13 </strong>is a novel and highly promising PET radioligand for the imaging of up regulated CB2R expression under pathological conditions in the brain.</p>", 
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    "title": "Data Publication: Structure-Based Design, Optimization and Development of [18F]LU13, a novel radioligand for CB2R Imaging in the Brain with PET", 
    "doi": "10.14278/rodare.1381", 
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      "cannabinoid receptor type 2", 
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        "name": "Moldovan, Rares-Petru", 
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        "orcid": "0000-0003-3119-7945"
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        "name": "G\u00fcndel, Daniel", 
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        "orcid": "0000-0001-9743-2325"
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        "name": "Deuther-Conrad, Winnie", 
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        "orcid": "0000-0003-3168-3062"
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        "name": "Lai, Thu Hang", 
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        "orcid": "0000-0001-8157-8979"
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        "name": "Clau\u00df, Oliver", 
        "affiliation": "HZDR", 
        "orcid": "0000-0001-5067-4845"
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        "name": "Scheunemann, Matthias", 
        "affiliation": "HZDR"
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      {
        "name": "Kopka, Klaus", 
        "affiliation": "HZDR", 
        "orcid": "0000-0003-4846-1271"
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        "name": "Bachmann, Michael", 
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