Please use this identifier to cite or link to this item: https://doi.org/10.1016/0041-0101(94)90205-4
Title: Stonustoxin: Effects on neuromuscular function in vitro and in vivo
Authors: Low, K.S.Y.
Gwee, M.C.E. 
Yuen, R.
Khoo, H.E. 
Gopalakrishnakone, P. 
Issue Date: 1994
Citation: Low, K.S.Y., Gwee, M.C.E., Yuen, R., Khoo, H.E., Gopalakrishnakone, P. (1994). Stonustoxin: Effects on neuromuscular function in vitro and in vivo. Toxicon 32 (5) : 573-581. ScholarBank@NUS Repository. https://doi.org/10.1016/0041-0101(94)90205-4
Abstract: Stonustoxin (8-50 μg/ml) produced a rapid and concentration-dependent rise in tension (contracture) of the electrically stimulated mouse hemidiaphragm followed by a gradual waning of tension from the peak to the baseline; the nerve-evoked and the directly (muscle)-evoked twitches of the hemidiaphragm were also progressively and irreversibly blocked in a time- and concentration-dependent manner. Stonustoxin (22 and 44 μg/ml) produced a similar rapid rise in tension of the chick biventer cervicis muscle as well as irreversible and concentration-dependent blockade of nerve-evoked twitches and contractures produced by acetylcholine (200 μM), carbachol (8 μM) and KCl (40mM). The muscle contracture produced by stonustoxin was blocked by dantrolene sodium (6 μM) but not by tubocurarine (15 μM). Moreover, stonustoxin (40 μg/ml) did not inhibit nerve conduction in the toad sciatic nerve and stonustoxin (60 μg/ml) did not exhibit any anticholinesterase activity. The inhibition of neuromuscular function by stonustoxin in the mouse hemidiaphragm and chick biventer cervicis muscle can therefore be attributed to some irreversible myotoxic action(s)) of the toxin, whereas the stonustoxin-induced muscle contractures could have been mediated via depolarization of muscle fibres.
Source Title: Toxicon
URI: http://scholarbank.nus.edu.sg/handle/10635/33931
ISSN: 00410101
DOI: 10.1016/0041-0101(94)90205-4
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