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豚鼠大脑皮层中的胆碱代谢。磷酸胆碱和脂质胆碱。

Choline metabolism in the cerebral cortex of guinea pigs. Phosphorylcholine and lipid choline.

作者信息

Dowdall M J, Barker L A, Whittaker V P

出版信息

Biochem J. 1972 Dec;130(4):1081-94. doi: 10.1042/bj1301081.

Abstract
  1. The labelling of phosphorylcholine and choline-containing phospholipids in the subcellular fractions of guinea-pig cerebral cortex after the intraventricular injection of [N-Me-(3)H]choline into conscious animals has been studied. Special emphasis was placed upon the synaptosome fraction and early time-periods after administration. 2. The labelling of phosphorylcholine was rapid compared with that of phospholipid and was confined to two distinct subcellular fractions: the soluble cytoplasmic fraction and the synaptosome fraction. Most of the labelled phosphorylcholine of the synaptosome fraction was readily released by osmotic rupture indicating location in the nerve-ending cytoplasm. The two pools of phosphorylcholine had similar specific radioactivities at all observed times. 3. (3)H-labelled phospholipid was found in all membranous fractions. The labelling was confined to choline-containing phospholipids, notably phosphatidylcholine. 4. The labelling of the different membranous fractions was similar. 5. The half-life of the choline-containing phospholipids in the synaptic vesicle fraction was very much greater than the acetylcholine in this fraction. 6. Evidence is presented that synthesis de novo of phosphatidylcholine at nerve terminals occurs in vivo.
摘要
  1. 研究了向清醒动物脑室内注射[N-甲基-(3)H]胆碱后,豚鼠大脑皮质亚细胞组分中磷酸胆碱和含胆碱磷脂的标记情况。特别关注了突触体组分以及给药后的早期时间段。2. 与磷脂相比,磷酸胆碱的标记速度较快,且局限于两个不同的亚细胞组分:可溶性细胞质组分和突触体组分。突触体组分中大部分标记的磷酸胆碱可通过渗透破裂轻易释放,表明其位于神经末梢细胞质中。在所有观察时间点,这两个磷酸胆碱池具有相似的比放射性。3. 在所有膜性组分中均发现了(3)H标记的磷脂。标记局限于含胆碱的磷脂,尤其是磷脂酰胆碱。4. 不同膜性组分的标记情况相似。5. 突触小泡组分中含胆碱磷脂的半衰期比该组分中的乙酰胆碱长得多。6. 有证据表明,神经末梢处磷脂酰胆碱的从头合成在体内发生。

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