Effect of acute or chronic pentobarbital administration on the steady state levels and the turnover rates of catecholamines in discrete brain areas of mice

Toshitaka Nabeshima, Kannosuke Fujimori, Ing K. Ho

研究成果: Article査読

6 被引用数 (Scopus)

抄録

1. 1. In mice receiving a single injection of sodium pentobarbital, 75 mg/kg, i.p., the whole brain catecholamine contents did not change. However, norepinephrine levels of the diencephalon and mesencephalon and dopamine contents of the cortex and the striatum were increased by acute pentobarbital treatment. The depletion of norepinephrine after the treatment of α-methyl- p ̄tyrosine, 250 mg/kg, 4 hr before sacrifice, was significantly smaller in the cortex, the pons plus medulla oblongata and the cerebellum in acute pentobarbital-treated animals. The rate of dopamine depletion after α-methyl- p ̄-tyrosine treatment in the striatum was also slower than that of the control group. 2. 2. In pentobarbital tolerant animals, decreases in norepinephrine level of the pons plus medulla oblongata and in dopamine content of the striatum were observed. The depletion of dopamine after α-methyl- p ̄-tyrosine treatment was significantly smaller than that of the control group. 3. 3. In pentobarbital dependent animals, changes of catecholamine steady state levels in discrete areas of the brain were returned to normal. The rates of norepinephrine depletion observed after α-methyl- p ̄-tyrosine treatment in the cortex and the pons plus medulla oblongata were significantly greater than that of the control groups. 4. 4. The present results suggest that acute pentobarbital causes a depression of catecholaminergic neuronal activity by a decrease of catecholamine turnover (degradation) and the development of tolerance to pentobarbital accompanies with the suppression of catecholamine synthesis. In contrast, the norepinephrine turnover increases after the occurrence of abrupt withdrawal.

本文言語English
ページ(範囲)121-128
ページ数8
ジャーナルProgress in Neuro-Psychopharmacology
5
2
DOI
出版ステータスPublished - 1981
外部発表はい

All Science Journal Classification (ASJC) codes

  • 神経科学(全般)
  • 薬理学、毒性学および薬学(全般)
  • 精神医学および精神衛生
  • 薬理学(医学)

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