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- W2044288212 abstract "The mechanism of inhibition of skeletal muscle function by brevetoxin (PbTX-3) was examined in vitro in the rat phrenic nerve-diaphragm preparation. PbTX-3 in low concentrations (< 0.06 microM) preferentially blocked conduction in the phrenic nerve without altering the resting membrane potential of the muscle fibers. Endplate potential failure occurred in an all-or-none fashion in the presence of PbTX-3 (> 0.06 microM). An increase in the frequency of miniature endplate potentials resulting from nerve terminal depolarization was observed only after endplate potential failure. Higher concentrations of toxin (> 0.3 microM) depressed directly-elicited muscle twitches and produced significant muscle membrane depolarization. Tetrodotoxin was effective in reversing membrane depolarization and alterations in MEPP frequency caused by PbTX-3. These findings suggest that diaphragmatic failure in PbTX-3 is primarily caused by a block of impulse conduction in the phrenic nerve due to a higher sensitivity of nerve than muscle membrane to the toxin." @default.
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- W2044288212 date "1993-04-01" @default.
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- W2044288212 title "Differential actions of brevetoxin on phrenic nerve and diaphragm muscle in the rat" @default.
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- W2044288212 doi "https://doi.org/10.1016/0041-0101(93)90181-h" @default.
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