Hormone release is tied to changes in cell size in the osmoreceptive prolactin cell of a euryhaline teleost fish, the tilapia, Oreochromis mossambicus

General and Comparative Endocrinology
G M WeberE Gordon Grau

Abstract

Prolactin (PRL) cells from a teleost fish, the tilapia, Oreochromis mossambicus, facilitate the direct study of osmoreception. The release of two prolactins, PRL(188) and PRL(177), which act in freshwater osmoregulation in teleost fish, rises in vitro within 5 min after extracellular osmolality falls. An increase in cell size accompanied this rise. Cell size and PRL release also increased, albeit more slowly, following the partial replacement of medium NaCl (55 mOsmolal) with an equivalent concentration of urea, a membrane-permeant molecule. Similar replacement using mannitol, which is membrane-impermeant, elicits no response. These findings suggest that osmoreception is linked to changes in cell volume rather than to extracellular osmolality per se.

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Citations

Jul 18, 2008·American Journal of Physiology. Cell Physiology·Jernej JorgacevskiRobert Zorec
Nov 1, 2011·General and Comparative Endocrinology·A P SealeE G Grau
May 17, 2011·Journal of Neuroscience Methods·Hanna Kalamarz-KubiakEwa Kulczykowska
May 10, 2011·General and Comparative Endocrinology·Shenghong XuIan M Cooke
Dec 13, 2005·Molecular Endocrinology·Ning-Ai LiuShlomo Melmed
Dec 26, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Soichi WatanabeToyoji Kaneko
Aug 10, 2012·Physiology·Dietmar Kültz
Sep 18, 2015·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Mayu InokuchiAndre P Seale
Mar 2, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Soichi WatanabeToyoji Kaneko
Jul 3, 2020·Frontiers in Neuroscience·Arpád DobolyiMelinda Cservenák
Sep 28, 2013·The Journal of Experimental Biology·Alison M GardellDietmar Kültz

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