Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Estradiol impairs hyposmoregulatory capacity in the euryhaline tilapia, Oreochromis mossambicus
Autore:
Vijayan, MM; Takemura, A; Mommsen, TP;
Indirizzi:
Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ol, Waterloo, ON N2L 3G1, Canada Univ Ryukyus, Trop Biosphere Res Project, Sesoko Stn, Okinawa 9050227, Japan Univ Ryukyus Okinawa Japan 9050227 t, Sesoko Stn, Okinawa 9050227, Japan Univ Victoria, Dept Biochem & Microbiol, Victoria, BC V8W 3P6, Canada UnivVictoria Victoria BC Canada V8W 3P6 ol, Victoria, BC V8W 3P6, Canada
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
fascicolo: 4, volume: 281, anno: 2001,
pagine: R1161 - R1168
SICI:
0363-6119(200110)281:4<R1161:EIHCIT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT ONCORHYNCHUS-MYKISS; IMMATURE RAINBOW-TROUT; K+-ATPASE ACTIVITY; PROTEIN-SYNTHESIS; CHLORIDE CELLS; SAROTHERODON-MOSSAMBICUS; CORTISOL TREATMENT; SALMO-GAIRDNERI; ATLANTIC SALMON; GROWTH-HORMONE;
Keywords:
stress; intermediary metabolism; vitellogenin; ion regulation; gill sodium-potassium-adenosinetriphosphatase;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Vijayan, MM Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 , ON N2L 3G1, Canada
Citazione:
M.M. Vijayan et al., "Estradiol impairs hyposmoregulatory capacity in the euryhaline tilapia, Oreochromis mossambicus", AM J P-REG, 281(4), 2001, pp. R1161-R1168

Abstract

Freshwater (FW)-adapted tilapia (Oreochromis mossambicus) were treated with estradiol (E-2) for 4 days to stimulate protein synthesis and sampled at 0, 4, and 24 h after exposure to 50% seawater (SW). E-2 increased circulating vitellogenin (VTG) levels in large amounts, indicative of unusually highrates of hepatic protein synthesis. E-2 treatment prevented the recovery of plasma osmolality in 50% SW that was evident in the sham group. Plasma sodium concentration was significantly elevated with E-2 in FW, but the levels did not change in 50% SW. Gill Na+-K+-ATPase activity was significantly lower in the E-2 group compared with sham-injected tilapia in 50% SW. No significant differences were noted in plasma cortisol, thyroxine, triiodothyronine, or glucose concentration with E-2 in 50% SW. E-2 significantly lowered several key liver enzyme activities and also decreased gill lactate dehydrogenase and malate dehydrogenase activities over a 24-h period. Together, our results suggest that E-2 impairs ion regulation in tilapia, partially mediated by a decreased metabolic capacity in liver and gill. The decreased tissue metabolic capacity is likely due to E-2-induced energy repartitioning processes that are geared toward VTG synthesis at the expense of other energy-demanding pathways.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:12:21