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pubmed-article:8182702pubmed:abstractTextThe bis(dichlorobenzyl) ether of the bispyridinium oxime TMB 4 stabilizes antagonist binding to M2-cholinoceptors which is indicative of an allosteric action. More than 10 derivatives of the lead compound were synthesized to investigate structure-activity relationships. The allosteric potency of the compounds was indicated by the concentrations which retarded the rate of dissociation of [3H]N-methylscopolamine from porcine cardiac cholinoceptors by a factor of 2 (EC50). Compared with TMB 4, the bis(dichlorobenzyl) derivative 4a displayed a more than 200-fold higher potency (EC50 = 4.7 microM). One of the dichlorobenzyl groups could be replaced by a methyl group without loss of activity (EC50 = 4.5 microM). Further shortening of this end of the molecule was accompanied by a moderate decline in potency to a minimum of EC50 = 26 microM. The second quaternary nitrogen was not a prerequisite for an allosteric activity. It is concluded that one half of the lead compound is pivotal for an interaction with the allosteric site of the M2-cholinoceptor, whereas the opposite end of the molecule modulates the allosteric activity.lld:pubmed
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pubmed-article:8182702pubmed:pagination1439-45lld:pubmed
pubmed-article:8182702pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:8182702pubmed:year1994lld:pubmed
pubmed-article:8182702pubmed:articleTitleSearch for the pharmacophore of bispyridinium-type allosteric modulators of muscarinic receptors.lld:pubmed
pubmed-article:8182702pubmed:affiliationInstitute of Pharmacy, University of Bonn, FRG.lld:pubmed
pubmed-article:8182702pubmed:publicationTypeJournal Articlelld:pubmed
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pubmed-article:8182702pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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