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Vol. 280, Issue 1, 346-356, 1997

Pharmacological Characterization of Recombinant Human Neuronal Nicotinic Acetylcholine Receptors halpha 2beta 2, halpha 2beta 4, halpha 3beta 2, halpha 3beta 4, halpha 4beta 2, halpha 4beta 4 and halpha 7 Expressed in Xenopus Oocytes

Laura E. Chavez-Noriega, James H. Crona, Mark S. Washburn, Arturo Urrutia, Kathryn J. Elliott and Edwin C. Johnson

SIBIA Neurosciences, Inc., La Jolla, California

Human neuronal nicotinic acetylcholine receptors (nAChRs) halpha 2beta 2, halpha 2beta 4, halpha 3beta 2, halpha 3beta 4, halpha 4beta 2, halpha 4beta 4 and halpha 7 were expressed in Xenopus oocytes and tested for their sensitivities to the nicotinic agonists acetylcholine (ACh), nicotine, cytisine (CYT) and 1,1-dimethyl-4-phenylpiperazinium (DMPP) and the nAChR. antagonists mecamylamine (MEC), d-tubocurarine and dihydro-beta -erythroidine. CYT was the least efficacious agonist at hnAChRs containing beta 2 subunits, but it displayed significant activity at halpha 2beta 4, halpha 3beta 4, halpha 4beta 4 and halpha 7 nAChRs. ACh was one of the most efficacious agonists at all hnAChRs, except at halpha 3beta 2, where DMPP was markedly more efficacious than ACh. ACh was among the least potent agonists at all hnAChRs. The rank order of potency displayed by halpha 3beta 2 and halpha 3beta 4 nAChRs (DMPPapprox CYTapprox nicotine>ACh and DMPP > CYTapprox nicotine>ACh, respectively), differs from that reported for their rat homologs (; ). The agonist profile observed in halpha 7 also differs from that reported for its rat homolog (Seguela et al., 1993). Human alpha 4beta 2 and halpha 4beta 4 nAChRs were more sensitive to dihydro-beta -erythroidine than d-tubocurarine, whereas halpha 7 and halpha 3beta 4 were more sensitive to d-tubocurarine than dihydro-beta -erythroidine. These antagonists were equipotent at halpha 2beta 2, halpha 3beta 2 and halpha 2beta 4 nAChRs. MEC (3 µM) inhibited halpha 2beta 4 and halpha 4beta 4 nAChRs by > 80%, whereas halpha 2beta 2, halpha 4beta 2 and halpha 7 nAChRs were inhibited by approximately 50%. Taken together, the differential sensitivities observed at various recombinant hnAChR subtypes indicate that both alpha  and beta  subunits contribute to the pharmacology of these ligand-gated channels. The unique selectivity profiles displayed by human nAChRs constitute a valuable tool for the development of selective nicotinic analogs as potential therapeutic drugs.


Copyright © by The American Society for Pharmacology and Experimental Therapeutics



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K. A. Stauderman, L. S. Mahaffy, M. Akong, G. Veliçelebi, L. E. Chavez-Noriega, J. H. Crona, E. C. Johnson, K. J. Elliott, A. Gillespie, R. T. Reid, et al.
Characterization of Human Recombinant Neuronal Nicotinic Acetylcholine Receptor Subunit Combinations alpha 2beta 4, alpha 3beta 4 and alpha 4beta 4 Stably Expressed in HEK293 Cells
J. Pharmacol. Exp. Ther., February 1, 1998; 284(2): 777 - 789.
[Abstract] [Full Text]




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