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Brain Research 2000-Dec

Neuronal degeneration in the limbic system of weanling rats exposed to saline, hyperthermia or d-amphetamine.

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J F Bowyer

Raktažodžiai

Santrauka

Neuronal degeneration was detected in the tenia tecta and other regions of the anterior limbic system of male weanling rats 3 days after four doses of 5 mg/kg d-amphetamine (4 x 5 mg/kg AMPH) when seizures occurred during AMPH exposure. Neurodegeneration in the parietal cortex, loss of tyrosine hydroxylase immunoreactivity in the caudate-putamen (CPu) and decreases in CPu tissue dopamine levels in weanlings was much less than those previously observed in adults. The neurotoxicity seen in the parietal cortex and CPu of the weanlings was much less than previously seen in adults even though severe hyperthermia and the behavior of retrograde propulsion occurred during AMPH exposure. Neurodegeneration was not detected in any of the previously mentioned brain regions in controls and weanlings made hyperthermic by a warm environment. However, signs of spontaneous neurodegeneration were seen in the posterior piriform cortex (Pir), posteriolateral cortical amygdaloid nucleus (PLCo), and the amygdalopiriform transition area (APir) of control weanlings. The doses of AMPH and the degree of hyperthermia necessary to induce seizures were substantially lower in weanlings compared to those previously observed in adult rats. Further studies will be necessary to determine if the susceptibility of weanlings to AMPH-induced seizures is related to or dependent on the same processes involved in producing degeneration in the posterior limbic system of saline controls.

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