Cytidine-5′-diphosphocholine (citicoline or CDP-choline) is an essential endoge- nous intermediate in the biosynthesis of phosphatidylcholine. In the present study, primary dopaminergic cultures from mouse mesencephala were treated with citicoline to investigate its neuroprotective potential on the survival of dopaminergic neurons exposed to MPP+ and glutamate. Treatment with citicoline alone significantly increased the survival of dopaminergic neurons compared to controls. MPP+ or glutamate decreased the total number of dopaminergic neurons whereas citicoline afforded significant protection against either toxicity. Moreover, citicoline significantly decreased propidium iodide uptake by cultured cells. The study concludes that citicoline exerts stimulant and neuroprotective actions on cultured dopaminergic neurons.
