Environmental calcium regulates gill remodeling in a euryhaline teleost fish

2017 ◽  
Vol 327 (2-3) ◽  
pp. 139-142 ◽  
Author(s):  
Alexis Platek ◽  
Andy J. Turko ◽  
Andrew Donini ◽  
Scott Kelly ◽  
Patricia A. Wright
Keyword(s):  
Teleost Fish ◽  
Gill Remodeling ◽  
Euryhaline Teleost

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

2004 ◽  
Vol 138 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Gregory M Weber ◽  
Andre P Seale ◽  
N.Harold Richman III ◽  
M.H Stetson ◽  
Tetsuya Hirano ◽  
...  
Keyword(s):  
Cell Size ◽  
Teleost Fish ◽  
Oreochromis Mossambicus ◽  
Hormone Release ◽  
Prolactin Cell ◽  
Euryhaline Teleost

Atrial natriuretic factor and salt adaptation in the teleost fish Gila atraria

1988 ◽  
Vol 255 (6) ◽  
pp. F1281-F1286 ◽  
Author(s):  
C. Westenfelder ◽  
F. M. Birch ◽  
R. L. Baranowski ◽  
M. J. Rosenfeld ◽  
D. K. Shiozawa ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Fresh Water ◽  
Teleost Fish ◽  
Atrial Natriuretic Factor ◽  
Salt Adaptation ◽  
Fresh Water Fish ◽  
Fish Heart ◽  
Natriuretic Factor ◽  
Euryhaline Teleost ◽  
Atrial Natriuretic

It is unknown whether atrial natriuretic factor (ANF) is a mediator of environmental salt tolerance in euryhaline teleost fish. This was investigated in anesthetized Gila atraria, a euryhaline teleost native to springs of pleistocene Lake Bonneville. Plasma levels of immunoreactive (ir) ANF [using anti-human ANF-(99-126) antibodies] in fish obtained from a "fresh water" spring were significantly lower (146 +/- 27) than those in fish obtained from a "1% NaCl" spring (347 +/- 21 pg/ml, P less than 0.01). Electron micrographs of fish atrial and ventricular cardiocytes demonstrated many perinuclear granules, which closely resembled ANF-containing secretory granules seen in mammalian atriocytes. Fish heart extract contained ANF-like material of 3 kDa, which caused a marked diuresis and natriuresis in rats. In a second study, fish from a 1% NaCl spring were kept in tanks. One-third of the fish were maintained in 1% NaCl and one-third each were either adapted to fresh- or high-salt water. After 12 days, plasma irANF levels in 1% NaCl fish were 343 +/- 55, in fresh water fish 213 +/- 20 and in high-NaCl fish 691 +/- 79 pg/ml. These values differed significantly from each other (P less than 0.01). There was a close correlation between plasma irANF levels and both environmental and internal salt concentration. These data suggest that piscine ANF is an as yet unrecognized mediator of salt tolerance in this teleost and that ANF in these animals closely resembles mammalian ANF.

Focal adhesion kinase and osmotic responses in ionocytes of Fundulus heteroclitus, a euryhaline teleost fish

2020 ◽  
Vol 241 ◽  
pp. 110639
Author(s):  
Breton Fougere ◽  
Katelyn R. Barnes ◽  
Magen E. Francis ◽  
Lauren N. Claus ◽  
Regina R.F. Cozzi ◽  
...  
Keyword(s):  
Focal Adhesion Kinase ◽  
Focal Adhesion ◽  
Teleost Fish ◽  
Fundulus Heteroclitus ◽  
Euryhaline Teleost

scholarly journals Autocrine Positive Feedback Regulation of Prolactin Release From Tilapia Prolactin Cells and Its Modulation by Extracellular Osmolality

Endocrinology ◽  
2016 ◽  
Vol 157 (9) ◽  
pp. 3505-3516 ◽  
Author(s):  
Yoko Yamaguchi ◽  
Shunsuke Moriyama ◽  
Darren T. Lerner ◽  
E. Gordon Grau ◽  
Andre P. Seale
Keyword(s):  
Teleost Fish ◽  
Cell Function ◽  
Critical Role ◽  
Feedback Regulation ◽  
Prolactin Cells ◽  
Prolactin Release ◽  
Autocrine Regulation ◽  
Euryhaline Teleost ◽  
Regulatory Complexity ◽  
Osmotic Stimuli

Prolactin (PRL) is a vertebrate hormone with diverse actions in osmoregulation, metabolism, reproduction, and in growth and development. Osmoregulation is fundamental to maintaining the functional structure of the macromolecules that conduct the business of life. In teleost fish, PRL plays a critical role in osmoregulation in fresh water. Appropriately, PRL cells of the tilapia are directly osmosensitive, with PRL secretion increasing as extracellular osmolality falls. Using a model system that employs dispersed PRL cells from the euryhaline teleost fish, Oreochromis mossambicus, we investigated the autocrine regulation of PRL cell function. Unknown was whether these PRL cells might also be sensitive to autocrine feedback and whether possible autocrine regulation might interact with the well-established regulation by physiologically relevant changes in extracellular osmolality. In the cell-perfusion system, ovine PRL and two isoforms of tilapia PRL (tPRL), tPRL177 and tPRL188, stimulated the release of tPRLs from the dispersed PRL cells. These effects were significant within 5–10 minutes and lasted the entire course of exposure, ceasing within 5–10 minutes of removal of tested PRLs from the perifusion medium. The magnitude of response varied between tPRL177 and tPRL188 and was modulated by extracellular osmolality. On the other hand, the gene expression of tPRLs was mainly unchanged or suppressed by static incubations of PRL cells with added PRLs. By demonstrating the regulatory complexity driven by positive autocrine feedback and its interaction with osmotic stimuli, these findings expand upon the knowledge that pituitary PRL cells are regulated complexly through multiple factors and interactions.

scholarly journals Tight Junction Elaboration Aids Hypersaline Secretion in Euryhaline Teleost Fish

2015 ◽  
Vol 29 (S1) ◽  
Author(s):  
William Marshall ◽  
Gabriella Zaparilla ◽  
George Robertson ◽  
Regina Cozzi
Keyword(s):  
Tight Junction ◽  
Teleost Fish ◽  
Euryhaline Teleost

Freeze fracture of the gill epithelium of euryhaline teleost fish

1980 ◽  
Vol 238 (3) ◽  
pp. R207-R212 ◽  
Author(s):  
C. Sardet
Keyword(s):  
Plasma Membrane ◽  
Tight Junctions ◽  
Teleost Fish ◽  
Freeze Fracture ◽  
Chloride Cells ◽  
Gill Epithelium ◽  
Functional Importance ◽  
Seawater Adaptation ◽  
Basolateral Plasma Membrane ◽  
Euryhaline Teleost

We briefly discuss the information one can obtain using freeze fracture. We used this technique to precisely identify the types of junctions that link the cells of the gill epithelium of euryhaline teleosts. In particular we demonstrate that seawater adaptation is characterized by the appearance of new apical tight junctions between chloride cells. Another particularity of these cells, the extensive network of tubules, extension of the basolateral plasma membrane, is shown to be made of repetitive units. We discuss the functional importance of the observations with respect to the adaptation of fish to different salinities.

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