Abstract:
:The actions of 5-hydroxytryptamine have been studied in the chick biventer cervicis nerve--muscle preparation. At concentrations between 2.5 X 10(-3) and 3.7 X 10(-3) M, 5HT produced a transient increase in responses to indirect stimulation, but not to direct stimulation. At higher concentrations, 5HT produced a reversible depression of twitches, which was much more marked in indirectly than in directly stimulated preparations. In a concentration range of 2.5-3.7 X 10(-3) M, 5HT increased the response to exogenous acetylcholine but reduced the response to carbachol. After pretreatment with neostigmine, 5HT inhibited responses to both acetylcholine and carbachol. It is suggested that the facilitatory effects of 5HT are due to its anticholinesterase activity. The blocking actions of 5HT are thought to be curare-like. In addition, irreversible toxic effects on the muscle preparations were found after repeated exposures to high concentrations of 5HT.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Teerapong P,Harvey ALdoi
10.1016/0014-2999(77)90095-4subject
Has Abstractpub_date
1977-07-15 00:00:00pages
99-104issue
2eissn
0014-2999issn
1879-0712pii
0014-2999(77)90095-4journal_volume
44pub_type
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