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

scholarly journals Prolactin 177, prolactin 188, and extracellular osmolality independently regulate the gene expression of ion transport effectors in gill of Mozambique tilapia

2015 ◽  
Vol 309 (10) ◽  
pp. R1251-R1263 ◽  
Author(s):  
Mayu Inokuchi ◽  
Jason P. Breves ◽  
Shunsuke Moriyama ◽  
Soichi Watanabe ◽  
Toyoji Kaneko ◽  
...  
Keyword(s):  
Gene Expression ◽  
Mrna Expression ◽  
Incubation Time ◽  
Oreochromis Mossambicus ◽  
Mrna Levels ◽  
Ion Transporters ◽  
Local Effects ◽  
Mozambique Tilapia ◽  
Gill Filaments ◽  
Euryhaline Teleost

This study characterized the local effects of extracellular osmolality and prolactin (PRL) on branchial ionoregulatory function of a euryhaline teleost, Mozambique tilapia ( Oreochromis mossambicus). First, gill filaments were dissected from freshwater (FW)-acclimated tilapia and incubated in four different osmolalities, 280, 330, 380, and 450 mosmol/kg H2O. The mRNA expression of Na+/K+-ATPase α1a (NKA α1a) and Na+/Cl− cotransporter (NCC) showed higher expression with decreasing media osmolalities, while Na+/K+/2Cl− cotransporter 1a (NKCC1a) and PRL receptor 2 (PRLR2) mRNA levels were upregulated by increases in media osmolality. We then incubated gill filaments in media containing ovine PRL (oPRL) and native tilapia PRLs (tPRL177 and tPRL188). oPRL and the two native tPRLs showed concentration-dependent effects on NCC, NKAα1a, and PRLR1 expression; Na+/H+ exchanger 3 (NHE3) expression was increased by 24 h of incubation with tPRLs. Immunohistochemical observation showed that oPRL and both tPRLs maintained a high density of NCC- and NKA-immunoreactive ionocytes in cultured filaments. Furthermore, we found that tPRL177 and tPRL188 differentially induce expression of these ion transporters, according to incubation time. Together, these results provide evidence that ionocytes of Mozambique tilapia may function as osmoreceptors, as well as directly respond to PRL to modulate branchial ionoregulatory functions.

scholarly journals Prolactin cell activity and sodium fluxes in tilapia (Oreochromis mossambicus) after long-term acclimation to acid water

1989 ◽  
Vol 75 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Gert Flik ◽  
Joan A. van der Velden ◽  
Hein C.M. Seegers ◽  
Zvonimir Kolar ◽  
Sjoerd E. Wendelaar Bonga
Keyword(s):  
Cell Activity ◽  
Oreochromis Mossambicus ◽  
Acid Water ◽  
Prolactin Cell
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