Hu YC, Chu KF, Hwang LY, Lee TH. Cortisol regulation of Na
+, K
+-ATPase β1 subunit transcription via the pre-receptor 11β-hydroxysteroid dehydrogenase 1-like (
11β-Hsd1L) in gills of hypothermal freshwater milkfish, Chanos chanos.
J Steroid Biochem Mol Biol 2019;
192:105381. [PMID:
31128249 DOI:
10.1016/j.jsbmb.2019.105381]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 05/15/2019] [Accepted: 05/21/2019] [Indexed: 12/31/2022]
Abstract
Hypothermal stress changes the balance of osmoregulation by affecting Na+, K+-ATPase (Na-K-ATPase) activity or inducing modulation to epithelium permeability in fish. Meanwhile, cellular concentrations of cortisol can be modulated by the pre-receptor enzymes 11β-hydroxysteroid dehydrogenase 1 and 2 (11β-Hsd1 and 2). In fish, increasing levels of exogenous cortisol stimulate Na+ uptake via specific interaction with cortisol. This study investigated cortisol effects on expression of Na-K-ATPase subunit proteins and activity in gills of milkfish under hypothermal stress and revealed that the plasma cortisol contents as well as gill 11β-hsd1l and na-k-atpase β1 mRNA abundance were decreased in fresh water (FW) milkfish. Meanwhile, in the seawater (SW) milkfish, the plasma cortisol contents and gill 11β-hsd1l and na-k-atpase β1 mRNA abundance was increased under hypothermal stress. On the other hand, the abundance of 11β-hsd2 mRNA increased in both FW and SW. In addition, 11β-hsd1l expression increased in FW milkfish but decreased in SW milkfish after cortisol injection. Accordingly, the results that gill Na-K-ATPase activity of FW milkfish was affected by environmental temperatures as well as cortisol-dependent Na-K-ATPase β1-subunit levels might be due to increased expression of 11β-hsd1l that elevated intracellular cortisol contents. In hypothermal SW milkfish, decreasing abundance of Na-K-ATPase β1 protein due to reduced expression of 11β-hsd1l was found after cortisol injection. Thus, under hypothermal stress, 11β-HSD1L in FW milkfish gills was used to modulate cortisol and the following effects on increasing the transcription of Na-K-ATPase β1 protein.
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