PMID: 3921424Mar 1, 1985Paper

Environmental control of prolactin synthesis in the teleost fish Oreochromis (formerly Sarotherodon) mossambicus

General and Comparative Endocrinology
S E Wendelaar BongaG J Van Eys

Abstract

In the cichlid fish Oreochromis mossambicus prolactin cell activity is inversely related to the osmolarity and the Ca2+ concentration of the ambient water. Prolactin cell activity was estimated, at the end of a 3-week experimental period, by determination of the rate of prolactin synthesis during incubation of the rostral parts of the pituitary gland, in the presence of [3H]lysine. Since the secretory activity of isolated prolactin cells is known to be inversely related to the osmolarity of the incubation medium, the possibility was investigated that the effects of changes in ionic composition of the ambient water on prolactin secretion in vivo are mediated by changes in osmolarity of the blood plasma. No support was found for this hypothesis. In fish exposed to high water osmolarities prolactin cell activity was reduced, while plasma osmolarity increased. In contrast, at high Ca2+ concentrations of the water, when prolactin secretion was inhibited to a similar extent, plasma osmolarity was significantly reduced. Although direct effects of plasma osmolarity on prolactin cells cannot be excluded completely, it is unlikely that plasma osmolarity is the predominant factor in the control of prolactin cell activity in situ. The phys...Continue Reading

References

Jan 1, 1977·General and Comparative Endocrinology·S W FarmerC H Li
Jan 1, 1977·Endocrine Research Communications·J A Mattheij
Jun 1, 1968·General and Comparative Endocrinology·M Dharmamba, R Nishioka
Feb 1, 1968·General and Comparative Endocrinology·M Sage
Jun 1, 1981·General and Comparative Endocrinology·J N Ball
Aug 1, 1984·General and Comparative Endocrinology·S E Wendelaar BongaG Flik
Jan 1, 1980·Cell and Tissue Research·M OlivereauJ Olivereau

Citations

May 1, 1992·Fish Physiology and Biochemistry·N Mayer-Gostan, R Naon
Nov 1, 1985·Proceedings of the National Academy of Sciences of the United States of America·J L SpeckerH A Bern
Oct 1, 1988·General and Comparative Endocrinology·S E Wendelaar BongaG Flik
Aug 1, 1990·General and Comparative Endocrinology·L R Johnston, T Wigham
Jul 9, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Janet GenzW Gary Anderson

Related Concepts

Calcium
High Pressure Liquid Chromatography Procedure
Lysine Hydrochloride
Osmolality
Pituitary Stalk
Prolactin

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