NDLI: Environmental and cortisol-mediated control of Ca2+ uptake in tilapia (Oreochromis mossambicus)

Content Provider	Springer Nature Link
Author	Lin, Chia Hao Kuan, Wei Chun Liao, Bo Kai Deng, Ang Ni Tseng, Deng Yu Hwang, Pung Pung
Copyright Year	2016
Abstract	Ca2+ is a vital element for many physiological processes in vertebrates, including teleosts, which live in aquatic environments and acquire Ca2+ from their surroundings. Ionocytes within the adult gills or larval skin are critical sites for transcellular Ca2+ uptake in teleosts. The ionocytes of zebrafish were found to contain transcellular Ca2+ transporters, epithelial Ca2+ channel (ECaC), plasma membrane Ca2+-ATPase 2 (PMCA2), and Na+/Ca2+ exchanger 1b (NCX1b), providing information about the molecular mechanism of transcellular Ca2+ transports mediated by ionocytes in fish. However, more evidence is required to establish whether or not a similar mechanism of transcellular Ca2+ transport also exists in others teleosts. In the present study, ecac, pmca2, and ncx1 were found to be expressed in the branchial ionocytes of tilapia, thereby providing further support for the mechanism of transcellular Ca2+ transport through ionocytes previously proposed for zebrafish. In addition, we also reveal that low Ca2+ water treatment of tilapia stimulates Ca2+ uptake and expression of ecac and cyp11b (the latter encodes a cortisol-synthesis enzyme). Treatment of tilapia with exogenous cortisol (20 mg/l) enhanced both Ca2+ influx and ecac expression. Therefore, increased cyp11b expression is suggested to enhance Ca2+ uptake capacity in tilapia exposed to low Ca2+ water. Furthermore, the application of cortisol receptor antagonists revealed that cortisol may regulate Ca2+ uptake through glucocorticoid and/or mineralocorticoid receptor (GR and/or MR) in tilapia. Taken together, the data suggest that cortisol may activate GR and/or MR to execute its hypercalcemic action by stimulating ecac expression in tilapia.
Starting Page	323
Ending Page	332
Page Count	10
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	186
Issue Number	3
e-ISSN	1432136X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ECaC Ca2+ influx Ionocyte Cortisol Tilapia Animal Physiology Biomedicine general Human Physiology Zoology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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