April 5, 2023 Dataset Open Access

Teodoro, Rodrigo; Gündel, Daniel; Deuther-Conrad, Winnie; Toussaint, Magali; Wenzel, Barbara; Bormans, Guy; Kopka, Klaus; Brust, Peter; Moldovan, Rares-Petru

DCAT Export

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        <foaf:name>Teodoro, Rodrigo</foaf:name>
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        <foaf:name>Gündel, Daniel</foaf:name>
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        <foaf:name>Deuther-Conrad, Winnie</foaf:name>
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        <foaf:name>Toussaint, Magali</foaf:name>
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        <foaf:name>Wenzel, Barbara</foaf:name>
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        <foaf:name>Kopka, Klaus</foaf:name>
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        <foaf:name>Brust, Peter</foaf:name>
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        <foaf:name>Moldovan, Rares-Petru</foaf:name>
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    <dct:title>Data publication: Enantioselective Synthesis, Structure Activity Relationship, Radiofluorination and Biological Evaluation of [18F]RM365, a Novel Radioligand for Imaging the Human Cannabinoid Receptor Type 2 (CB2R) in the Brain with PET</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2023</dct:issued>
    <dcat:keyword>cannabinoid receptor type 2</dcat:keyword>
    <dcat:keyword>indole-2-carboxamide</dcat:keyword>
    <dcat:keyword>binding affinity</dcat:keyword>
    <dcat:keyword>radiochemistry</dcat:keyword>
    <dcat:keyword>fluorine-18 labeling</dcat:keyword>
    <dcat:keyword>positron-emission tomography</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2023-04-05</dct:issued>
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    <dct:description>&lt;p&gt;The development of cannabinoid receptor type 2 (CB2R) PET radioligands has been intensively explored due to the pronounced CB2R upregulation in various pathological conditions, such as neuroinflammation and cancer. Herein we report on the enantioselective synthesis of a series of highly affine fluorinated indole-2-carboxamide ligands targeting the CB2R in the brain. Compound RM365 was selected for PET radiotracer development due to its high CB2R affinity (Ki = 2.1 nM) and pronounced selectivity over CB1R (factor &amp;gt; 300). A fully automated copper-mediated radiofluorination of [18F]RM365 was established starting from the corresponding aryl boronic acid pinacol ester precursor. Preliminary in vitro evaluation of [18F]RM365 indicated species differences in the binding to CB2R (KD of 2.32 nM for the human CB2R vs. KD &amp;gt; 10000 nM for the rat CB2R). Metabolism studies in mice revealed high stability of [18F]RM365 with fractions of parent compound of &amp;gt; 90% in the brain and &amp;gt; 54% in the plasma at 30 min p.i. PET imaging in a rat model of local hCB2R(D80N) overexpression in the brain demonstrate the ability of [18F]RM365 to reach and selectively label the intracranial expressed hCB2R(D80N) with high signal-to-background ratio. Thus, [18F]RM365 is a very promising PET radioligand for the imaging of upregulated hCB2R expression under pathological conditions with high potential towards clinical application in humans.&lt;/p&gt;</dct:description>
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