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pubmed-article:6308364pubmed:abstractTextLocal blockade of transmitter release was produced by s.c. injection of purified botulinum neurotoxin (NT) types A or E above the tibialis anterior muscle of adult male rats. Extensor digitorum longus nerve-muscle preparation was examined for toxin-induced alterations in single twitch and tetanic tension (in situ) or transmitter release (in vitro). For both single twitch and tetanic tension, muscles treated with type E NT recovered from an initial partial paralysis (induced with 56 mouse LD50) or full paralysis (induced with 565 mouse LD50) by 7 days after NT injection, while those treated with only 5 mouse LD50 of type A remained either fully or partially paralysed through 10 days. Also, miniature end-plate potential frequency and mean quantal content were reduced for a longer period of time and/or to a greater extent for muscles treated with type A NT than for those treated with type E. The present results are consistent with the observed higher specific toxicity (i.p. injections in mice) for type A NT than for type E, although these differences may be exaggerated after s.c. injections. The differences in the paralytic effect between types A and E may be determined by differences in amino acid sequence, which causes type E to dissociate more easily from its site of action and/or be detoxified more rapidly. The clinical implications of these findings are discussed.lld:pubmed
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pubmed-article:6308364pubmed:authorpubmed-author:SellinL CLClld:pubmed
pubmed-article:6308364pubmed:authorpubmed-author:DasguptaB RBRlld:pubmed
pubmed-article:6308364pubmed:authorpubmed-author:KauffmanJ AJAlld:pubmed
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pubmed-article:6308364pubmed:pagination120-5lld:pubmed
pubmed-article:6308364pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:6308364pubmed:year1983lld:pubmed
pubmed-article:6308364pubmed:articleTitleComparison of the effects of botulinum neurotoxin types A and E at the rat neuromuscular junction.lld:pubmed
pubmed-article:6308364pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:6308364pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:6308364pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:6308364pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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