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• W1990488728 abstract "Seizures produced by pilocarpine given i.p. to rats provide an animal model for studying the initiation, spread and generalisation of convulsive activity within the forebrain. Pilocarpine, 380 mg/kg, produces a sequence of behavioural and electroencephalographic alterations indicative of motor limbic seizures and status epilepticus, which is followed by widespread damage to the limbic forebrain resembling that occurring subsequent to prolonged intractable seizures. Microinjections of a selective antagonist at the N-methyl-D-aspartate receptor, (+/-)-2-amino-7-phosphonoheptanoate, into the substantia nigra pars reticulata, bilaterally, protects against the behavioural, electrographic and morphological features of seizures produced by pilocarpine, 380 mg/kg, with an ED50 of 0.0007 mumol (0.0004-0.0011). Microinjections of (+/-)-2-amino-7-phosphonoheptanoate, 0.005 or 0.01 mumol, into the substantia nigra pars compacta or into the dorsal part of mid-anterior striatum do not modify the electrographic and morphological sequelae of pilocarpine, 380 mg/kg. In rats pretreated with microinjections of N-methyl-D-aspartate into the substantia nigra pars reticulata, a non-convulsive dose of pilocarpine, 100 mg/kg, results in recurrent motor limbic seizures and status epilepticus. The ED50 of N-methyl-D-aspartate for the generation of seizures after pilocarpine, 100 mg/kg, is 0.0014 mumol (0.001-0.0019). Electrographic monitoring shows a pattern and sequence of evolution of convulsant activity within the hippocampus and cortex similar to that produced with pilocarpine, 380 mg/kg, alone. Morphological examination of brains from rats treated with N-methyl-D-aspartate in the substantia nigra pars reticulata and subsequently given pilocarpine, 100 mg/kg, which underwent status epilepticus, reveals widespread damage to the amygdala, thalamus, olfactory cortex, substantia nigra, neocortex, and hippocampus. Microinjections of N-methyl-D-aspartate, 0.002 mumol, into either the substantia nigra pars compacta or dorsal striatum, bilaterally, do not augment seizures produced by pilocarpine, 100 mg/kg. The results indicate that the threshold for pilocarpine-induced seizures in rats is modulated by excitatory amino acid neurotransmission within the substantia nigra pars reticulata." @default.
• W1990488728 created "2016-06-24" @default.
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• W1990488728 date "1986-05-01" @default.
• W1990488728 modified "2023-09-25" @default.
• W1990488728 title "Excitatory neurotransmission within substantia nigra pars reticulata regulates threshold for seizures produced by pilocarpine in rats: Effects of intranigral 2-amino-7-phosphonoheptanoate and n-methyl-d-aspartate" @default.
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• W1990488728 doi "https://doi.org/10.1016/0306-4522(86)90179-x" @default.
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