Abstract
Rationale and objective
Agonists of α7 nicotinic acetylcholine receptors (nAChRs) may have therapeutic potential for the treatment of cognitive deficits. This study describes the in vitro pharmacology of the novel α7 nAChR agonist/serotonin 5-HT3 receptor (5-HT3R) antagonist N-[(3R)-1-azabicyclo[2.2.2]oct-3-yl]-6-chinolincarboxamide (EVP-5141) and its behavioral effects.
Results
EVP-5141 bound to α7 nAChRs in rat brain membranes (K i = 270 nM) and to recombinant human serotonin 5-HT3Rs (K i = 880 nM) but had low affinity for α4β2 nAChRs (K i > 100 μM). EVP-5141 was a potent agonist at recombinant rat and human α7 nAChRs expressed in Xenopus oocytes. EVP-5141 acted as 5-HT3R antagonist but did not block α3β4, α4β2, and muscle nAChRs. Rats trained to discriminate nicotine from vehicle did not generalize to EVP-5141 (0.3–30 mg kg−1, p.o.), suggesting that the nicotine cue is not mediated by the α7 nAChR and that EVP-5141 may not share the abuse liability of nicotine. EVP-5141 (0.3–3 mg kg−1) improved performance in the rat social recognition test. EVP-5141 (0.3 mg kg−1, p.o.) ameliorated scopolamine-induced retention deficits in the passive avoidance task in rats. EVP-5141 (1 mg kg−1, i.p.) improved spatial working memory of aged (26- to 32-month-old) rats in a water maze repeated acquisition task. In addition, EVP-5141 improved both object and social recognition memory in mice (0.3 mg kg−1, p.o.).
Conclusions
EVP-5141 improved performance in several learning and memory tests in both rats and mice, supporting the hypothesis that α7 nAChR agonists may provide a novel therapeutic strategy for the treatment of cognitive deficits in Alzheimer's disease or schizophrenia.
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Abbreviations
- A-582941:
-
2-Methyl-5-(6-phenyl-pyridazin-3-yl)-octahydro-pyrrolo[3,4-c]pyrrole
- Aβ1–40 :
-
Amyloid peptide
- ABBF:
-
N–[(3R)-1-Azabicyclo[2.2.2]oct–3–yl]–7–[2–(methoxy)phenyl]-1-benzofuran-2-carboxamide
- ABT-107:
-
5-(6-[(3R)-1-Azabicyclo[2,2,2]oct-3-yloxy]pyridazin-3-yl)-1H-indole
- ACh:
-
Acetylcholine
- ANOVA:
-
Analysis of variance
- AR-R17779:
-
(−)-Spiro[1-azabicyclo[2.2.2]octane-3,5′-oxazolidin-2′-one]
- AZD0328:
-
(2′R)-Spiro-[1-azabicyclo[2.2.2]octane-3,2′(3′H)-furo[2,3-b]pyridine] d-tartrate
- d1:
-
Discrimination index
- d2:
-
Unbiased discrimination index
- EVP-5141:
-
N-[(3R)-1-Azabicyclo[2.2.2]oct-3-yl]-6-chinolincarboxamide
- EVP-6124:
-
(R)-7-Chloro-N-quinuclidin-3-yl)benzo[b]thiophene-2-carboxamide
- GR65630:
-
3-(5-Methyl-1H-imidazol-4-yl)-1-(1-methyl-1H-indol-3-yl)-1-propanone
- GTS-21:
-
3-(2,4-Dimethoxybenzylidene)anabaseine
- 5-HT:
-
Serotonin (5-hydroxytryptamine)
- 5-HT3R:
-
5-HT3 receptor
- JN403:
-
(S)-(1-Aza-bicyclo[2.2.2]oct-3-yl)-carbamic acid (S)-1-(2-fluoro-phenyl)-ethyl ester
- LSD:
-
Fisher's least significant difference post hoc test
- LTP:
-
Long-term potentiation
- MLA:
-
Methyllycaconitine
- nAChR:
-
Nicotinic acetylcholine receptor
- NFR:
-
Normal frog Ringer's solution
- RG3487:
-
N-[(3S)-1-Azabicyclo[2.2.2]oct-3-yl]-1H-indazole-3-carboxamide hydrochloride
- S 24795:
-
2-[2-(4-Bromophenyl)-2-oxoethyl]-1-methyl pyridinium
- SEN12333:
-
5-Morpholin-4-yl-pentanoic acid (4-pyridin-3-yl-phenyl)-amide
- SEM:
-
Standard error of the mean
- SSR180711:
-
1,4-Diazabicyclo(3.2.2)nonane-4-carboxylic acid 4-bromophenyl ester
- T1:
-
Trial 1
- T2:
-
Trial 2
- W-56203:
-
(R)-3′-(3-Methylbenzo[b]thiophen-5-yl)spiro-[1-azabicyclo[2,2,2]-octane-3,5′-oxazolidin]-2′-one, compound 23
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Acknowledgments
We gratefully acknowledge the assistance of P. Ammelung, D. Chodor, H. Dresen, K. Jentzsch, M. Keil, S. Kellermann, D. Klankers, and M. Kuster.
Conflict of interest
All authors were employed by Bayer Healthcare, Bayer Technology Services, or Bayer Central Research, respectively, at the time of the experiments. EnVivo Pharmaceuticals, Inc., has a world-wide license from BayerSchering Pharmaceuticals for various patents covering this and other compounds.
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Boess, F.G., de Vry, J., Erb, C. et al. Pharmacological and behavioral profile of N-[(3R)-1-azabicyclo[2.2.2]oct-3-yl]-6-chinolincarboxamide (EVP-5141), a novel α7 nicotinic acetylcholine receptor agonist/serotonin 5-HT3 receptor antagonist. Psychopharmacology 227, 1–17 (2013). https://doi.org/10.1007/s00213-012-2933-4
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DOI: https://doi.org/10.1007/s00213-012-2933-4