| Abstrakt: |
Whether the temporary retention of intact soman in the rat and its subsequent delivery from tissues into the circulation of the blood is also demonstrable in guinea-pigs and marmosets has been investigated as was whether the soman simulator PDP (pinacolyl dimethylphosphinate) prevented this retention. Electric eel AChE, intravenously injected 1.5 h after an intravenous soman intoxication into anaesthetized, atropinized and artificially ventilated guinea-pigs (150 μg kg−1soman), marmoset monkeys (100 μg kg−1soman) and rats (330 and 172.5 μg kg−1soman) lost its activity faster than enzyme injected in non-intoxicated animals. Electric eel AChE incubated in the presence of pectoralis or diaphragm muscle isolated from soman-intoxicated rats, guinea-pigs and marmosets 0.5 or 1.5 h after the intoxication, was progressively inhibited, indicating that those muscles still delivered soman into the incubation medium. In rats, PDP (6.4 mg kg−1i.v.) pretreatment was effective in preventing inhibition of intravenously injected electric eel AChE 1.5 h after intoxication with a high dose of soman (330 μg kg−1). But after intoxication with a low dose (172.5 μg kg−1), PDP pretreatment was ineffective in this action, however, it did lead to less soman delivery from muscle tissue isolated 30 min following the 172.5 μg kg−1soman intoxication, suggesting that there was less soman in the tissue. In PDP (6.4 mg kg−1i.v.)-pretreated marmosets (100 μg kg−1soman) and guinea-pigs (150 μg kg−1soman), to the contrary, the trend was for the injected AChE to be more inhibited, whereas only slightly less soman was delivered from isolated muscle tissue. It is suggested that after PDP treatment to rats the elimination of soman from the blood circulation is faster than in marmosets and guinea-pigs. |
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