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Discovery of VU6052959/BI'7927: A Selective mGlu3 Positive Allosteric Modulator (PAM) from an Orthogonal Benzoxazine
Caleb A Jones1,2, Renn A Duncan1,2, Kristen M Gilliland1,2
1Warren Center for Neuroscience Drug Discovery, Vanderbilt Institute for Therapeutic Advances, Vanderbilt University, Nashville, Tennessee 37232, United States.
Abstract:
We report the discovery of an additional selective metabotropic glutamate receptor subtype 3 (mGlu3) positive allosteric modulator (PAM) tool compound, VU6052959/BI'7927. A high-throughput screening (HTS) campaign identified a selective mGlu3 PAM VU6046180/BI'3690 (7) containing a benzoxazine core (an orthogonal chemotype to previously reported thiophene tool compound VU6053371/BI'8809 (6)). Lead optimization efforts focused on improving PK parameters led to the identification of VU6052959/BI'7927 (8). Orthogonal PAM 8 demonstrated efficacy in a rat novel object recognition task with conservation of our previously determined PK/PD relationship. However, an Ames positive metabolite halted further progression of 8.
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