effects of odontobuthus doriae scorpion venom on mouse sciatic nerve

Authors

hossein vatanpour full professor in pharmacology and toxicology, dept. of pharmacology and toxicology, pharmaceutical research sciences center and school of pharmacy, shaheed beheshti university of medical sciences, tehran, iran.

amir jalali associate professor in pharmacology and toxicology dept. of pharmacology and toxicology, school of pharmacy, toxicology research centre, ahvaz jundishapur university of medical sciences, ahvaz, iran.

edward rowan full professor in pharmacology and toxicology, strathclyde institutes of pharmacy and biomedical sciences, university of strathclyde, glasgow, uk.

fakher rahim phd in medical genetics, toxicology research centre, ahvaz jundishapur university of medical sciences, ahvaz, iran.

abstract

temporary paralysis is a rare manifestation of envenoming following the yellow iranian scorpion, odontobuthus doriae (o. doriae). thus, to elucidate the underlying mechanism, we investigated the neurotoxic effect of venom in the sciatic nerve, the possible mechanism in a mice model. the neurotoxicity and temperature effects in the venom-induced neurotoxicity were examined using the mouse sciatic nerve and mouse phrenic nerve-hemidiaphragm (mhd) preparations. o .doriae venom (1 µg/ml) caused changes in the perineural waveform associated with nerve terminal action potentials. venom affected on both negative and positive components of the waveform which is known as a compound action potential. the time-response relationship of venom-induced depression of resting membrane potential (rmp) was significant (p < 0.05). no significant difference in augmentation was seen in room temperature in comparison with 37°c. in conclusion, although there was no evidence that the venom had any specific curarizing action at the neuromuscular junction, the results suggest that the venom exerts its neuromuscular transmission on the sciatic nerve through potassium and sodium ionic-currents. furthermore, the influence of temperature on neurotoxicity was ineffective on blockade of the neuromuscular transmission in-vitro.

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Journal title:
the iranian journal of pharmaceutical research

جلد ۱۲، شماره Supplement، صفحات ۱۴۵-۱۵۱

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