Abstract
Intracerebroventricular injection of galanin (2 micrograms/rat) raised plasma prolactin (PRL) levels in the rat, which was accompanied by an increase in immunoreactive vasoactive intestinal polypeptide (VIP) in the cerebrospinal fluid (CSF). Immunoreactive VIP release from superfused rat hypothalamic fragments in vitro was dose-relatedly stimulated by galanin (10(-7) and 10(-8) M). PRL release from superfused rat anterior pituitary cells was stimulated by TRH (10(-8) M) but not affected by galanin (10(-7) to 10(-5) M). These findings indicate that central galanin has a stimulating role in the release of hypothalamic VIP, which results in pituitary PRL secretion in the rat.
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