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Titolo:
Effects of prolactin and growth hormone on strategies of hypoosmotic adaptation in a marine teleost, Sparus sarba
Autore:
Kelly, SP; Chow, INK; Woo, NYS;
Indirizzi:
Chinese Univ Hong Kong, Dept Biol, Shatin, NT, Hong Kong Chinese Univ HongKong Shatin NT Hong Kong t Biol, Shatin, NT, Hong Kong
Titolo Testata:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
fascicolo: 1, volume: 113, anno: 1999,
pagine: 9 - 22
SICI:
0016-6480(199901)113:1<9:EOPAGH>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
TILAPIA OREOCHROMIS-MOSSAMBICUS; COD GADUS-MORHUA; MITOCHONDRIA-RICH CELLS; K+ ATPASE ACTIVITY; SALMO-SALAR L; CHLORIDE CELLS; FRESH-WATER; SEAWATER ADAPTATION; LOW-SALINITY; CHUM SALMON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Woo, NYS Chinese Univ Hong Kong, Dept Biol, Shatin, NT, Hong Kong Chinese Univ Hong Kong Shatin NT Hong Kong hatin, NT, Hong Kong
Citazione:
S.P. Kelly et al., "Effects of prolactin and growth hormone on strategies of hypoosmotic adaptation in a marine teleost, Sparus sarba", GEN C ENDOC, 113(1), 1999, pp. 9-22

Abstract

Silver seabream (Sparus sarba) held in seawater (33 parts per thousand) oracclimated to a hypoosmotic environment of 6 parts per thousand were givenintraperitoneal injections of saline (0.8% NaCl), recombinant bream growthhormone (rbGH, 1 mu g/g), or ovine prolactin (oPRL, 6 mu g/g) for 7 consecutive days. Serum Na+ levels were unaffected by hypoosmotic acclimation andrbGH and oPRL treatment. Treatment of seawater fish with oPRL resulted in hyperchloremia. In 6 parts per thousand, saline-treated fish exhibited elevated branchial chloride cell (CC) numbers and exposure indices, all of which were markedly reduced by oPRL. CC numbers and morphometrics were unaffected by oPRL in seawater fish. In contrast, rbGH treatment of seawater fish resulted in elevated CC numbers, apical area, and fractional area and, in 6 parts per thousand fish, elevated CC fractional area and exposure numbers. Branchial Na+-K+-ATPase activity reduced in saline-treated fish adapted to 6% but was unaffected by rbGH regardless of salinity, oPRL reduced activityin both seawater and 6 parts per thousand-adapted fish. Neither hypoosmotic adaptation nor oPRL had any effect on renal Na+-K+-ATPase activity whereas rbGH reduced activity in both 33 and 6 parts per thousand. Saline-treatedfish adapted to 6 parts per thousand exhibited reduced Na+-K+-ATPase activity in most regions of the intestine. Treatment with rbGH did not change intestinal Na+-K+-ATPase activity of seawater fish but elevated activity in the anterior regions (esophagus and stomach) of 6 parts per thousand-adaptedfish. Treatment with oPRL elevated Na+-K+-ATPase activity throughout the gastrointestinal tract of seawater fish and in the anterior reaches of 6 parts per thousand-adapted fish. The data indicated that the as yet uncharacterized osmoregulatory roles of PRL and GH in seabream may warrant further attention as the present study connoted differing responses to that of other teleosts studied. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:26:20