Neuroprotection afforded by prior citicoline administration in experimental brain ischemia: effects on glutamate transport

胞磷胆碱 神经保护 缺血 谷氨酸受体 药理学 胆碱 医学 脑缺血 麻醉 化学 内分泌学 内科学 受体
作者
Olivia Hurtado,Marı́a A. Moro,Antonio Cárdenas,Verónica Sánchez,Paz Fernández-Tomé,Juan C. Leza,Pedro Lorenzo,Julio J Secades,Rafael Lozano,Antoni Dàvalos,José Castillo,Ignacio Lizasoaín
出处
期刊:Neurobiology of Disease [Elsevier]
卷期号:18 (2): 336-345 被引量:119
标识
DOI:10.1016/j.nbd.2004.10.006
摘要

Cytidine-5′-diphosphocholine (citicoline or CDP-choline), an intermediate in the biosynthesis of phosphatidylcholine, has shown beneficial effects in a number of CNS injury models including cerebral ischemia. Citicoline is the only neuroprotectant that has proved efficacy in patients with moderate to severe stroke. However, the precise mechanism by which citicoline is neuroprotective is not fully known. The present study was designed to search for mechanisms of citicoline neuroprotective properties using in vivo and in vitro models of brain ischemia. Focal brain ischemia was produced in male adult Fischer rats by occluding both the common carotid and middle cerebral arteries. Brain glutamate levels were determined at fixed intervals after occlusion. Animals were then sacrificed, and infarct volume and brain ATP levels were measured. As in vitro model of ischemia, rat cultured cortical neurones or astrocytes, isolated or in co-culture, were exposed to oxygen–glucose deprivation (OGD) either in the absence or in the presence of citicoline (1–100 μM). Viability was studied by measuring LDH release. Glutamate release and uptake, and ATP levels were also determined. Citicoline (0.5, 1 and 2 g/kg i.p. administered 1 h before the occlusion) produced a reduction of the infarct size measured at striatum (18, 27 and 42% inhibition, respectively, n = 8, P < 0.05 vs. ischemia), effect that correlated with the inhibition caused by citicoline on ischemia-induced increase in glutamate concentrations after the onset of the ischemia. Citicoline also inhibited ischemia-induced decrease in cortical and striatal ATP levels. Incubation of cultured rat cortical neurones with citicoline (10 and 100 μM) prevented OGD-induced LDH and glutamate release and caused a recovery in ATP levels after OGD, confirming our previous results. In addition, citicoline (100 μM) caused an increase in glutamate uptake and in EAAT2 glutamate transporter membrane expression in cultured rat astrocytes. Our present findings show novel mechanisms for the neuroprotective effects of citicoline, which cooperate to decrease brain glutamate release after ischemia.
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