Abstract
Binding sites for prolactin were localized and quantified in the female rat brain by in vitro autoradiographic analysis with iodine-125-labeled ovine prolactin. Following incubation, labeled prolactin bound preferentially to the median eminence and choroid plexus of the lateral and third ventricles. The addition of excess unlabeled ovine prolactin blocked binding of the labeled hormone in the choroid plexus, and attenuated prolactin binding in the median eminence. These results provide evidence for median eminence. These results provide evidence for prolactin-specific recognition sites in the median eminence, a region intimately involved in the hypothalamic regulation of prolactin secretion.
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