Abstract
The effects of pyrimidine heterocyclic compounds (MS-818 and MS-430) on nerve regeneration were evaluated using the cut-and-suture model of the right sciatic nerve of Wistar rats. After surgery, 1 or 5 mg/kg/day of MS-818 or MS-430 was intraperitoneally administered for 21 days. Control rats received the same surgery, but were administered saline instead of a drug. Each week from week 2, evoked muscle action potentials were recorded on the calf muscle to compare the ratio of latency and amplitude between tbe experimental and non-treated side. The specimens were taken from the tibial nerve for light microscopic observation; and the diameter, density and % axon area of myelinated axons were evaluated. Tbe results of EMG and histology suggest that administration of MS-818 is more effective than that of MS-430 and that administration of 5 mg/kg/day has a higher promoting effect than that of 1 mg/kg/day for sprouting and elongation of the severed nerve. These new neurotrophic pyrimidine compounds may be a group of possible substances effective in facilitating nerve regeneration.
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