Cited by 15Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchPharmacological Receptor Mechanisms and Effects

BNC210, a negative allosteric modulator of the alpha 7 nicotinic acetylcholine receptor, demonstrates anxiolytic- and antidepressant-like effects in rodents

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O'Connor, Susan M., Sleebs, Brad E., Street, Ian P., Flynn, Bernard L., Baell, Jonathan B., Coles, Carolyn, Quazi, Nurul, Paul, Dharam +5 more·2024·Neuropharmacology

Abstract

This work describes the characterization of BNC210 (6-[(2,3-dihydro-1H-inden-2-yl)amino]-1-ethyl-3-(4-morpholinylcarbonyl)-1,8-naphthyridin-4(1H)-one), a selective, small molecule, negative allosteric modulator (NAM) of α7 nicotinic acetylcholine receptors (α7 nAChR). With the aim to discover a non-sedating, anxiolytic compound BNC210 was identified during phenotypic screening of a focused medicinal chemistry library using the mouse Light Dark (LD) box to evaluate anxiolytic-like activity and the mouse Open Field (OF) (dark) test to detect sedative and/or motor effects. BNC210 exhibited anxiolytic-like activity with no measurable sedative or motor effects. Electrophysiology showed that BNC210 did not induce α7 nAChR currents by itself but inhibited EC80 agonist-evoked currents in recombinant GH4C1 cell lines stably expressing the rat or human α7 nAChR. BNC210 was not active when tested on cell lines expressing other members of the cys-loop ligand-gated ion channel family. Screening over 400 other targets did not reveal any activity for BNC210 confirming its selectivity for α7 nAChR. Oral administration of BNC210 to male mice and rats in several tests of behavior related to anxiety- and stress-related disorders, demonstrated significant reduction of these behaviors over a broad therapeutic range up to 500 times the minimum effective dose. Further testing for potential adverse effects in suitable rat and mouse tests showed that BNC210 did not produce sedation, memory and motor impairment or physical dependence, symptoms associated with current anxiolytic therapeutics. These data suggest that allosteric inhibition of α7 nAChR function may represent a differentiated approach to treating anxiety and stress-related disorders with an improved safety profile compared to current treatments.

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Crossref · 10.1016/j.neuropharm.2024.109836

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Authors
O'Connor, S. M., Sleebs, B. E., Street, I. P., Flynn, B. L., Baell, J. B., Coles, C., Quazi, N., Paul, D., Poiraud, E., Huyard, B., Wagner, S., Andriambeloson, E., & de Souza, E. B.
Affiliations
  • Bionomics (Australia) (AU)
  • The University of Melbourne (AU)
  • Monash University (AU)
  • Ningbo University (CN)
  • Walter and Eliza Hall Institute of Medical Research (AU)
Corresponding author
O'Connor, Susan M.
Venue
Neuropharmacology
Publisher
Elsevier BV
Published
2024-03
Volume
246
Pages
109836
ISSN
0028-3908 (ISSN-L)
OpenAlex
W4390629846
Cited by
15
References
64
Citations by year
2026: 6 · 2025: 6 · 2024: 3
FWCI
2.03
Type
journal article
Language
en
Open access
Locations
  • Neuropharmacology (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc-nd)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
Keywords
alpha7 nicotinic acetylcholine receptor, negative allosteric modulators, anxiolytic effects, antidepressant-like effects, anxiety-like behavior, stress-related disorders, sedation, ligand-gated ion channels, Cys-loop receptors, receptor selectivity, adverse effects
MeSH terms
Allosteric Regulation, Animals, Antidepressive Agents, Humans, Hypnotics and Sedatives, Male, Receptors, Nicotinic, Rodentia, Anti-Anxiety Agents, Mice, Rats, alpha7 Nicotinic Acetylcholine Receptor

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