| Biull Eksp Biol Med. 1989 Jun;107(6):706-9. |
| [Effect of nucleotides on N-methylcytisine and dimethyltubocurarine binding by the nicotinic acetylcholine receptors of the optic ganglia in the squid B. magister].[Pubmed: 2790167] |
The effect of nucleosides mono-, di-, and triphosphates on binding of 3H-N-methylcytisine and 14C-tubocurarine to nAChR from squid optical ganglia were investigated.
METHODS AND RESULTS:
It was found, that ATP and GTP potentiate the specific binding of 3H-N-methylcytisine and inhibit the one of 14C-tubocurarine. While conducting the photoaffinity modification of nACHR by 3H-azidomethylcytisine in the presence of ATP the increase of specific incorporation of label was observed in comparison with control. Molecular weight of labeled receptor complex and subunit, carrying the binding site was the same as the original. |
| Biull Eksp Biol Med. 1987 Dec;104(12):690-2. |
| [N-methylcytisine--a selective ligand of nicotinic receptors of acetylcholine in the CNS].[Pubmed: 3689962] |
The ability of cytisine and its N-methyl derivatives to bind to nicotinic acetylcholine receptors (nAChR) from different tissues was studied.
METHODS AND RESULTS:
Cytisine and N-methylcytisine have high affinity (KD = 50 nM) to nAChR from squid optical ganglia. N,N-dimethylcytisine did not show high affinity to this receptor. In the case of nAChR from T. marmorata, cytisine was the only effective inhibitor of 14C-tubocurarine specific binding (Ki = 700 nM). N-methyl- and N,N-dimethylcytisine did not displace 14C-tubocurarine at a concentration of 0.1 mM.
CONCLUSIONS:
The results obtained indicate that there are some differences in the structure of nAChR binding sites from squid and T. marmorata optical ganglia. |
| Agric. Biol. Chem., 1989, 53(8):2287-8. |
| Nematicidal Activities of ( – )--Methylcytisine and ( – )-Anagyrine from Sophora flavescens against Pine Wood Nematodes[Reference: WebLink] |
Although the effects of ( - )-N-methyleytisine (1) on the motility of Angiostrongylus cantonensis, Dipylidium caninum and Fasciola hepatica have already been investigated by Te r ada e t al.,5) the activities of ( -)-N-Methylcytisine (1) and ( -)-anagyrine (2) against pl ant parasitic nematodes have never been reported.
METHODS AND RESULTS:
The inhibitory effects of ( -)-N-methyleytisine and ( -)-anagyrine, together with ( -)-cytisine and ( - )-nicotine (Sigma Chern. Co.), on the propaga t ion of the pine wood nematode, Bursaphelenchus xylophilus, were examined by the sameprocedure as that described by Kawazu e t aU) As shown in Tables I and I I , the nematicidal activity of ( -) -Nmethylcytisine was about twice that of ( - )-anagyrine, but a half that of ( - )-cytisine and ( - )-nicotine.
CONCLUSIONS:
This result of ( - )-N-Methylcytisine and ( -)-anagyrine being the primary nematicidal constituents among various alkaloids contained in the root of S. jiavescens2 • 6 ) suggests that the cytisine-type structure common to both alkaloids (1 and 2) is favorable to show the nematicidal activity. |
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