Cytidine-5'-diphosphocholine affects CTP-phosphocholine cytidylyltransferase and lyso-phosphatidylcholine after transient brain ischemia

Cytidine-5'-diphosphocholine affects CTP-phosphocholine cytidylyltransferase and lyso-phosphatidylcholine after transient brain ischemia
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DOI:
10.1002/jnr.20078
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发表时间:
2004-05-01
影响因子:
4.2
通讯作者:
Dempsey, RJ
Dempsey, RJ
中科院分区:
医学3区
文献类型:
--
作者:
Adibhatla, RM;Hatcher, JF;Dempsey, RJ

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胞苷-5'-二磷酸胆碱(CDP-胆碱,也称为胞二磷胆碱)是磷脂酰胆碱 (PtdCho) 合成的关键中间体,对包括脑缺血在内的实验性中枢神经系统 (CNS) 损伤具有显着的益处。 CDP-胆碱由 CTP:磷酸胆碱胞苷酰转移酶 (CCT) 合成,CCT 是 PtdCho 合成中的关键限速酶。磷脂酶 A(2) (PLA(2)) 水解 PtdCho 产生游离脂肪酸和 lyso-PtdCho(CCT 抑制剂)。我们研究了沙鼠短暂脑缺血 10 分钟后再灌注长达 2 天的 CCT 和 lyso-PtdCho 的状态。没有再灌注的缺血导致细胞溶质(与假手术 695 +/- 45 相比,408 +/- 8 pmol/min/mg 蛋白质;P < 0.01)和膜(与假手术 532 +/- 54 相比,383 +/- 61;P < 0.05)中 CCT 活性丧失。再灌注 24 小时后,CCT 活性仍然较低,并在第 2 天在膜中恢复到假水平,但在细胞溶质中仍然较低。 CDP-胆碱显着增加了再灌注1小时时细胞质中的CCT活性(盐水,339 35与CDP-胆碱相比,430 +/- 70;P < 0.05)和6小时时膜中的CCT活性(盐水,381 +/- 32与CDP-胆碱相比,489 +/- 50;P < 0.01)和24小时(盐水,与 CDP-胆碱 594 +/- 45 相比,为 417 +/- 24;P < 0.01),但对第 2 天的 CCT 活性没有影响。Lyso-ptdCho 在再灌注 1 小时时增加(与假手术相比,为 219 +/- 5 nmol/g 组织,92 +/- 8;P < 0.01),并在 2 天内保持升高状态。 CDP-胆碱在再灌注 1 小时时减弱了 lyso-PtdCho 水平(162 +/- 21,与盐水相比,P < 0.01)。这些数据表明,脑缺血后 PtdCho 合成受损,CDPcholine 可能通过减弱 CCT 活性的丧失和溶血-PtdCho 形成来增加 PtdCho 水平。 (C) 2004 Wiley-Liss, Inc.
Cytidine-5'-diphosphocholine (CDP-choline, also referred as citicoline), the key intermediate in phosphatidylcholine (PtdCho) synthesis, provided significant benefit in experimental central nervous system (CNS) injury including cerebral ischemia. CDP-choline is synthesized by CTP:phosphocholine cytidylyltransferase (CCT), the key rate-limiting enzyme in PtdCho synthesis. Phospholipase A(2) (PLA(2)) hydrolyzes PtdCho to produce free fatty acids and lyso-PtdCho, an inhibitor of CCT. We investigated the status of CCT and lyso-PtdCho after 10-min transient brain ischemia in gerbils with reperfusion up to 2 days. Ischemia with no reperfusion resulted in loss of CCT activity in cytosol (408 +/- 8 pmol/min/mg protein compared to sham 695 +/- 45; P < 0.01) and membrane (383 +/- 61 compared to sham 532 +/- 54; P < 0.05). CCT activity remained low over 24-hr reperfusion, and returned to sham levels at Day 2 in membrane but remained low in cytosol. CDP-choline significantly increased CCT activity in cytosol at 1 hr reperfusion (saline, 339 35 compared to CDP-choline, 430 +/- 70; P < 0.05) and in membrane at 6 hr (saline, 381 +/- 32 compared to CDP-choline, 489 +/- 50; P < 0,01) and 24 hr (saline, 417 +/- 24 compared to CDP-choline, 594 +/- 45; P < 0.01), but had no effect on CCT activity at Day 2. Lyso-ptdCho increased at 1-hr reperfusion (219 +/- 5 nmol/g tissue compared to sham, 92 +/- 8; P < 0.01), and remained elevated over 2 days. CDP-choline attenuated lyso-PtdCho levels at 1-hr reperfusion (162 +/- 21, P < 0.01 compared to saline). These data indicate that PtdCho synthesis is impaired after brain ischemia, and CDPcholine may increase PtdCho levels by attenuating the loss of CCT activity and lyso-PtdCho formation. (C) 2004 Wiley-Liss, Inc.