Rat Ghrelin Stimulates Growth Hormone and Prolactin Release in the Tilapia, Oreochromis mossambicus

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Abstract
Recently, ghrelin (Ghr), a new peptide which specifically stimulates growth hormone (GH) release from the pituitary, was identified in the rat and human stomach. Ghrelin has been shown to stimulate GH release by acting through a growth hormone secretagogue (GHS) receptor in the rat. The present study describes the in vitro effect of rat Ghr on the release of GH and two forms of prolactin (PRL177 and PRL188) in the tilapia, Oreochromis mossambicus. Rat Ghr stimulated the release of GH in a dose-related manner after 8 and 24 hr of incubation. Rat Ghr also significantly stimulated the release of PRL177 and PRL188 in a dose-related manner after 24 hr. Rat Ghr had no effect on the pituitary content of GH or PRL188, but significantly increased PRL177 content. These results show for the first time that rat Ghr significantly stimulates GH and PRL release in teleosts, and suggest that Ghr and a GHS receptor are present in fish.

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