Effects of osmotic pressure and calcium ion on prolactin release in vitro from the rostral pars distalis of the tilapia Sarotherodon mossambicus

Grau, E.G.; Nishioka, R.S.; Bern, H.A.

General and Comparative Endocrinology 45(3): 406-408


ISSN/ISBN: 0016-6480
PMID: 7297849
DOI: 10.1016/0016-6480(81)90082-4
Accession: 042961475

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As in previous studies, prolactin (PRL) release from the rostral pars distalis of the euryhaline teleost Sarotherodon mossambicus in vitro was inversely related to the osmotic pressure of the incubation medium. In contrast, Prl release was independent of Ca2+ concentration when this divalent ion was included in the medium. Release was completely blocked, however, when calcium was excluded. While it appears unlikely that variations in plasma Ca2+ within the physiological range can act directly at the pituitary to alter prolactin secretion, our findings are consistent with the notion that calcium is an essential ion mediating Prl release.