Abstract
Short and long-term effects of chymopapain on nervous transmission were studied in rats. The drug was injected into the lumbar spinal canal. Action potentials evoked by electrical stimulation of the sciatic nerve were recorded at the dorsal root entry zone of the lumbar cord. One group of rats was pre-treated with dexamethasone. Chymopapain prolongs impulse latency compared to that of control rats treated with isotonic saline. The effect is dose dependent and can last for several weeks. Rats pre-treated with dexamethasone showed milder impairment of nervous transmission after chymopapain injection compared to the rats treated only with papain.
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