There remains a critical unmet need to develop novel therapeutic strategies for the treatment of MDD with more rapid onset of action, higher rates of response and remission for both depressed mood and anhedonic symptoms as well as diminished side-effect profiles. In studies reported by our group and others, the metabotropic glutamate receptor subtype 5 (mGlus) has been shown to function as a close signaling partner with NMDARs and may provide key regulation of NMDAR functions in limbic regions thought to be disrupted in individuals with MDD and anxiety disorders, and through a combination of genefic and pharmacological studies has emerged as an exciting new molecular target for MDD. Therefore, we aim to test the hypothesis that selective antagonism of mGlus may result in rapid and robust efficacy for the treatment of symptoms associated with MDD. We have discovered of a highly selective series of biaryl ether mGIUs KlAMs, exemplified by VU0409106 and VU0431316, provide an exciting opportunity to assess whether selective antagonism of mGIUs can provide an alternative approach to NMDAR antagonists and other clinical available antidepressants for the treatment of symptoms associated with MDD. However, we will need to develop additional novel mGlus NAMs with new intellectual property (IP) position as second generation preclinical candidates (PCCs) and back-up compounds. Thus, we will further optimize the biaryl ether series of mGlus NAMs, incorporating two points of structural diversity, divergent from VU0409106 and VU0431316, to afford IP position through the application of an iterative parallel synthesis and screening strategy (the Technology Enabled Synthesis or TES approach), as well as to ensure novel ligands maintain affinity at the MPEP site. In parallel, we will further optimize the DMPK profile of our new mGlus NAMs, relative to VU0409106 and VU0431316, to afford PCCs and back-ups with balanced profiles suitable to validate mGlus NAMs in preclinical models of depression and to initiate IND-enabling studies.

Public Health Relevance

To date, there has been limited success in the development of novel antidepressant therapies that provide a rapid onset of action and efficacy for the depressed mood and anhedonic symptoms observed in MDD patients. The studies outlined in project 2 of this NCDDDG will provide novel mGlus NAMs with the pharmacological and DMPK profile to clinically validate inhibition of mGIUs as a therapeutic approach to MDD.

National Institute of Health (NIH)
National Institute of Mental Health (NIMH)
Research Program--Cooperative Agreements (U19)
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Special Emphasis Panel (ZMH1-ERB-C)
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Vanderbilt University Medical Center
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Doria, Juliana G; de Souza, Jessica M; Silva, Flavia R et al. (2018) The mGluR5 positive allosteric modulator VU0409551 improves synaptic plasticity and memory of a mouse model of Huntington's disease. J Neurochem 147:222-239
Felts, Andrew S; Rodriguez, Alice L; Morrison, Ryan D et al. (2018) Discovery of 6-(pyrimidin-5-ylmethyl)quinoline-8-carboxamide negative allosteric modulators of metabotropic glutamate receptor subtype 5. Bioorg Med Chem Lett 28:1679-1685
Felts, Andrew S; Rodriguez, Alice L; Morrison, Ryan D et al. (2017) Discovery of imidazo[1,2-a]-, [1,2,4]triazolo[4,3-a]-, and [1,2,4]triazolo[1,5-a]pyridine-8-carboxamide negative allosteric modulators of metabotropic glutamate receptor subtype 5. Bioorg Med Chem Lett 27:4858-4866
Felts, Andrew S; Rodriguez, Alice L; Blobaum, Anna L et al. (2017) Discovery of N-(5-Fluoropyridin-2-yl)-6-methyl-4-(pyrimidin-5-yloxy)picolinamide (VU0424238): A Novel Negative Allosteric Modulator of Metabotropic Glutamate Receptor Subtype 5 Selected for Clinical Evaluation. J Med Chem 60:5072-5085
Nickols, Hilary Highfield; Yuh, Joannes P; Gregory, Karen J et al. (2016) VU0477573: Partial Negative Allosteric Modulator of the Subtype 5 Metabotropic Glutamate Receptor with In Vivo Efficacy. J Pharmacol Exp Ther 356:123-36
Lindsley, Craig W; Emmitte, Kyle A; Hopkins, Corey R et al. (2016) Practical Strategies and Concepts in GPCR Allosteric Modulator Discovery: Recent Advances with Metabotropic Glutamate Receptors. Chem Rev 116:6707-41
Felts, Andrew S; Rodriguez, Alice L; Morrison, Ryan D et al. (2016) N-Alkylpyrido[1',2':1,5]pyrazolo-[4,3-d]pyrimidin-4-amines: A new series of negative allosteric modulators of mGlu1/5 with CNS exposure in rodents. Bioorg Med Chem Lett 26:1894-900
Gould, Robert W; Amato, Russell J; Bubser, Michael et al. (2016) Partial mGlu? Negative Allosteric Modulators Attenuate Cocaine-Mediated Behaviors and Lack Psychotomimetic-Like Effects. Neuropsychopharmacology 41:1166-78
Nedelcovych, Michael T; Gould, Robert W; Zhan, Xiaoyan et al. (2015) A rodent model of traumatic stress induces lasting sleep and quantitative electroencephalographic disturbances. ACS Chem Neurosci 6:485-93
Gregory, Karen J; Nguyen, Elizabeth D; Malosh, Chrysa et al. (2014) Identification of specific ligand-receptor interactions that govern binding and cooperativity of diverse modulators to a common metabotropic glutamate receptor 5 allosteric site. ACS Chem Neurosci 5:282-95

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