Hormonal modulation of branchial Na+-K+-ATPase subunit mRNA in a marine teleost Sparus sarba
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AbstractThe effect of hormone treatment on the abundance of Na+-K+-ATPase alpha- and beta-subunit mRNA in Sparus sarba branchial tissue was investigated. Groups of seawater (33 parts per thousand) and hypo-osmotic (6 parts per thousand) acclimated fish were injected daily, with either saline, cortisol, recombinant bream growth hormone (rbGH) or ovine prolactin (oPRL). Total RNA from branchial tissue was analyzed by Northern blotting using PCR amplified Na+-K+-ATPase alpha- and beta-subunit cDNA clones. Na+-K+-ATPase alpha- and beta-subunit transcripts of 3.3kb and 2.4kb respectively, were detected and their abundance, after hormone treatment was assessed using RNA dot blots. The abundance of subunit mRNAs increased 1.4 - 1.9 fold, relative to controls, after cortisol treatment. The alpha : beta mRNA ratio also increased in cortisol treated seawater acclimated fish. Growth hormone treatment did not cause any significant changes in Na+-K+-ATPase subunit mRNA, whereas prolactin significantly reduced alpha-subunit mRNA levels by approximately 0.5 fold in both seawater and hypo-osmotic conditions. The data from this study add further support to the generally accepted roles that cortisol and prolactin have in the modulation of Na+-K+-ATPase activity. It can be concluded from this study that S. sarba branchial Na+-K+-ATPase subunit expression is multihormonally regulated.
All Author(s) ListDeane EE, Kelly SP, Woo NYS
Journal nameLife Sciences
Volume Number64
Issue Number20
Pages1819 - 1829
LanguagesEnglish-United Kingdom
Keywordscortisol; growth hormone; Na+-K+-ATPase; prolactin; subunit mRNA
Web of Science Subject CategoriesMedicine, Research & Experimental; MEDICINE, RESEARCH & EXPERIMENTAL; Pharmacology & Pharmacy; PHARMACOLOGY & PHARMACY; Research & Experimental Medicine

Last updated on 2021-23-02 at 00:59