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. 1983 Jul;79(3):673–680. doi: 10.1111/j.1476-5381.1983.tb10004.x

A study on the membrane depolarization of skeletal muscles caused by a scorpion toxin, sea anemone toxin II and crotamine and the interaction between toxins.

C C Chang, S J Hong, M J Su
PMCID: PMC2044913  PMID: 6197125

Abstract

Quinquestriatus toxin (QTX) isolated from the venom of a scorpion (Leiurus quinquestriatus) and sea anemone (Anemonia sulcata) toxin II enhanced the twitch response of the rat and mouse diaphragms and like crotamine (isolated from the venom of Crotalus durissus terrificus) caused spontaneous fasciculation of the muscle. Trains of action potentials in muscles at 70-250 Hz, which could not be antagonized by (+)-tubocurarine, were triggered by single stimulation or occurred spontaneously after treatment with these toxins. QTX and toxin II prolonged the rat muscle action potential 3 to 4 fold whereas crotamine prolonged the action potential by only 30%. The membrane potential was depolarized from about -82 mV to -55 mV by crotamine 2 micrograms ml-1, -41 mV by toxin II 5 micrograms ml-1 and to -50 mV by QTX 1 microgram ml-1. The concentrations to induce 50% maximal depolarization (K0.5) were 0.07, 0.15 and greater than 0.4 microgram ml-1, respectively, for QTX, crotamine and toxin II, whereas the rates of depolarization were in the order toxin II greater than or equal to crotamine greater than QTX. The depolarizing effects of crotamine and QTX, but not of toxin II, were saturable. The depolarizing effects of all three toxins were irreversible whereas the membrane potential could be restored by tetrodotoxin non-competitively. Simultaneous treatment with crotamine and QTX or crotamine and toxin II at concentrations below K0.5 caused only additive effects on depolarization. When the muscle was depolarized by pretreating with a saturating concentration of crotamine, the onset of depolarization by QTX was greatly retarded whereas that by toxin II was unaffected.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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