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Synaptic plasma membrane-bound acetylcholinesterase activity is not affected by docosahexaenoic acid-induced decrease in membrane order

机译:二十二碳六烯酸诱导的膜顺序下降不影响突触质膜结合的乙酰胆碱酯酶活性

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We investigated the effect of administration of docosahexaenoic acid (C22:6, n-3; 300 mg/kg-day, for 12 weeks) on the degree of membrane order and membrane-bound acetylcholincsterase activity of the cerebral cortex synaptic plasma membrane in male Wistar rats. Docosahexaenoic acid levels in the synaptic plasma membrane increased significantly by 16% over levels in control rats concomitant with an increase, in the molar ratio of docosahexaenoic acid to arachidonic acid. Synaptic plasma membrane order, assessed by 1,6-diphenyl-1,3,5-hexatriene, which measures order of the bulk internal hydrophobic lipid core, decreased significantly in the docosahexaenoic acid-fed rats. Lateral mobility of both global and annular lipids measured by pyrene also increased. Acetylcholinesterase activity of the synaptic plasma membrane was unaffected, and synaptic plasma membrane phospholipid contents increased in the docosahexaenoic acid-fed rats, with a concomitant decrease in the cholesterol/phospholipid molar ratio. Lipid peroxide and reactive oxygen species, indicators of tissue oxidative stress, decreased in both the cerebral cortex synaptosome and homogenate of the docosahexaenoic acid-fed rats. Arrhenius plot showed a break point in acetylcholinesterase activity at 22 degreesC and 24 degreesC in plasma membranes from docosahexaenoic acid-fed and control rats, respectively. The present experiment indicates that chronic administration of docosahexaenoic acid does not affect synaptic acetylcholinesterase activity and evoke oxidative stress, although it increases the disorder of the global and annular lipids of rat synaptic plasma membranes. (C) 2004 Elsevier Inc. All rights reserved.
机译:我们调查了二十二碳六烯酸(C22:6,n-3; 300 mg / kg-day,持续12周)的给药对男性大脑皮质突触质膜的膜有序度和膜结合乙酰胆碱酯酶活性的影响Wistar大鼠。二十二碳六烯酸与花生四烯酸的摩尔比增加,突触质膜中的二十二碳六烯酸水平比对照大鼠的水平显着增加了16%。在十二碳六烯酸喂养的大鼠中,由1,6-二苯基-1,3,5-己三烯评估的突触质膜顺序显着降低,该顺序可测量体内大部分疏水脂质核心的顺序。通过pyr测量的整体脂质和环状脂质的横向迁移率也增加。在二十二碳六烯酸喂养的大鼠中,突触质膜的乙酰胆碱酯酶活性未受影响,并且突触质膜磷脂含量增加,同时胆固醇/磷脂摩尔比降低。脂质过氧化物和活性氧是组织氧化应激的指标,在​​二十二碳六烯酸喂养的大鼠的大脑皮层突触体和匀浆中均降低。阿累尼乌斯图显示了由二十二碳六烯酸喂养的大鼠和对照大鼠的质膜在22℃和24℃时乙酰胆碱酯酶活性的断裂点。本实验表明,二十二碳六烯酸的长期给药虽然会增加大鼠突触质膜的整体脂质和环状脂质的紊乱,但不会影响突触乙酰胆碱酯酶的活性并不会引起氧化应激。 (C)2004 Elsevier Inc.保留所有权利。

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