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Vol. 280, Issue 1, 346-356, 1997
2
2, h
2
4, h
3
2,
h
3
4, h
4
2, h
4
4 and h
7 Expressed in
Xenopus Oocytes
SIBIA Neurosciences, Inc., La Jolla, California
Human neuronal nicotinic acetylcholine receptors (nAChRs) h
2
2,
h
2
4, h
3
2, h
3
4, h
4
2, h
4
4 and h
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-
-erythroidine. CYT was the least efficacious agonist at
hnAChRs containing
2 subunits, but it displayed significant activity
at h
2
4, h
3
4, h
4
4 and h
7 nAChRs. ACh was one
of the most efficacious agonists at all hnAChRs, except at h
3
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 h
3
2 and h
3
4 nAChRs (DMPP
CYT
nicotine>ACh
and DMPP > CYT
nicotine>ACh, respectively), differs from that
reported for their rat homologs (; ). The agonist profile observed in h
7
also differs from that reported for its rat homolog (Seguela et
al., 1993). Human
4
2 and h
4
4 nAChRs were more
sensitive to dihydro-
-erythroidine than d-tubocurarine, whereas
h
7 and h
3
4 were more sensitive to d-tubocurarine than
dihydro-
-erythroidine. These antagonists were equipotent at
h
2
2, h
3
2 and h
2
4 nAChRs. MEC (3 µM) inhibited h
2
4 and h
4
4 nAChRs by > 80%, whereas h
2
2,
h
4
2 and h
7 nAChRs were inhibited by approximately 50%. Taken
together, the differential sensitivities observed at various
recombinant hnAChR subtypes indicate that both
and
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.
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