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[Demonstration of prolactin flow into the cerebrospinal fluid of the alert rat in a pulsatile circhoral manner by push-pull cannulation of the 3d ventricle].

In 8 male unanesthetized rats, sequential sampling of cerebrospinal fluid (CSF) from a push-pull cannula implanted into the 3rd ventricle revealed that prolactin was present in this fluid, where it displayed circhoral pulsatility resembling the temporal variations in plasma prolactin observed in the same animals. Although basal prolactin levels were lower in the CSF than in the plasma, the amplitude of the circhoral prolactin pulses was twice as great in the CSF as in the plasma compartment. The possible origin and role of CSF prolactin are discussed.