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Titolo:
Hypercortisolemia does not affect the branchial osmoregulatory responses of the marine teleost Sparus sarba
Autore:
Deane, EE; Kelly, SP; Woo, NYS;
Indirizzi:
Chinese Univ Hong Kong, Dept Biol, Shatin, Hong Kong, Peoples R China Chinese Univ Hong Kong Shatin Hong Kong Peoples R China Peoples R China
Titolo Testata:
LIFE SCIENCES
fascicolo: 15, volume: 66, anno: 2000,
pagine: 1435 - 1444
SICI:
0024-3205(20000303)66:15<1435:HDNATB>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
TILAPIA OREOCHROMIS-MOSSAMBICUS; CHLORIDE CELL MORPHOLOGY; MITOCHONDRIA-RICH CELLS; NA+-K+-ATPASE; SALMO-SALAR L; FRESH-WATER; BETA-SUBUNIT; SEAWATER ADAPTATION; ATLANTIC SALMON; GROWTH-HORMONE;
Keywords:
cortisol; Na+-K+-ATPase alpha-subunit mRNA; Na+-K+-ATPase beta-subunit mRNA; gill chloride cell;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Woo, NYS Chinese Univ Hong Kong, Dept Biol, Shatin, Hong Kong, Peoples R China Chinese Univ Hong Kong Shatin Hong Kong Peoples R China R China
Citazione:
E.E. Deane et al., "Hypercortisolemia does not affect the branchial osmoregulatory responses of the marine teleost Sparus sarba", LIFE SCI, 66(15), 2000, pp. 1435-1444

Abstract

The effect of cortisol treatment on branchial Na+-K+-ATPase subunit mRNA abundance, enzyme activity, chloride cell number/morphometrics and serum electrolyte levels were investigated for the marine teleost Sparus sarba. Groups of fish received intraperitoneal injections of cortisol ata concentration of 4 mu g/g body weight, daily, over a seven-day period. This dose of cortisol was sufficiently high enough to maintain a condition of hypercortisolemia as serum cortisol levels in treated fish were eleven fold higher than controls at time of sacrifice. By using branchial Na+-K+-ATPase alpha- and beta-subunit cDNA clones we were able to demonstrate that cortisol administration to S. sarba caused a significant elevation in the abundance of alpha-mRNA whereas the levels of beta-mRNA were unchanged. In addition Na+-K+-ATPase activity remained unaltered by cortisol administration. Branchial chloride cell number, exposure, apical area as well as serum Na+ and Cl- levelsremained unchanged after cortisol administration. The results of this study suggest that elevated cortisol level may not necessarily translate into modulated branchial Na+-K+-ATPase activity and chloride cell function in hypo-osmoregulating marine fish.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:06:13