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Titolo:
Selective changes in the protein-turnover rates and nature of growth induced in trout liver by long-term starvation followed by re-feeding
Autore:
Peragon, J; Barroso, JB; Garcia-Salguero, L; Aranda, F; de la Higuera, M; Lupianez, JA;
Indirizzi:
Univ Granada, Ctr Ciencias Biol, Dept Bioquim & Biol Mol, E-18001 Granada,Spain Univ Granada Granada Spain E-18001 uim & Biol Mol, E-18001 Granada,Spain Univ Granada, Ctr Biol Sci, Dept Anim Biol & Ecol, Granada, Spain Univ Granada Granada Spain l Sci, Dept Anim Biol & Ecol, Granada, Spain Univ Jaen, Dept Expt Biol, Mol & Biochem Pharmacol Sect, Jaen, Spain Univ Jaen Jaen Spain pt Biol, Mol & Biochem Pharmacol Sect, Jaen, Spain
Titolo Testata:
MOLECULAR AND CELLULAR BIOCHEMISTRY
fascicolo: 1-2, volume: 201, anno: 1999,
pagine: 1 - 10
SICI:
0300-8177(199911)201:1-2<1:SCITPR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGUILLA-ROSTRATA LESUEUR; RAINBOW-TROUT; ONCORHYNCHUS-MYKISS; OXYGEN-CONSUMPTION; SALMO-GAIRDNERI; SMALL-INTESTINE; MUSCLE; GLUCONEOGENESIS; DEGRADATION; DEPRIVATION;
Keywords:
hyperplasia; hypertrophy; liver; nucleic-acid concentration; protein-growth rate; protein-turnover rate; rainbow trout (Oncorhynchus mykiss); starvation/re-feeding cycle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Lupianez, JA Univ Granada, Ctr Ciencias Biol, Dept Bioquim & Biol Mol, Avda FuentenuevaS-N, E-18001 Granada, Spain Univ Granada Avda Fuentenueva S-N Granada Spain E-18001 pain
Citazione:
J. Peragon et al., "Selective changes in the protein-turnover rates and nature of growth induced in trout liver by long-term starvation followed by re-feeding", MOL C BIOCH, 201(1-2), 1999, pp. 1-10

Abstract

We report upon the effects of a cycle of long-term starvation followed by re-feeding on the liver-protein turnover rates and nature of protein growthin the rainbow trout (Oncorhynchus mykiss). We determined the protein-turnover rate and its relationship with the nucleic-acid concentrations in the livers of juvenile trout starved for 70 days and then re-fed for 9 days. During starvation the total hepatic-protein and RNA contents decreased significantly and the absolute protein-synthesis rate (A(S)) also fell, whilst the fractional protein-synthesis rate (K-S) remained unchanged and the fractional protein-degradation rate (K-D) increased significantly. Total DNA content, an indicator of hyperplasia, and the protein:DNA ratio, an indicator of hypertrophy, both fell considerably. After re-feeding for 9 days the protein-accumulation rates (K-G, A(G)) rose sharply, as did K-S, A(S), K-D, protein-synthesis efficiency (K-RNA) and the protein-synthesis rate/DNA unit (K-DNA). The total hepatic protein and RNA contents increased but still remained below the control values. The protein:DNA and RNA:DNA ratios increasedsignificantly compared to starved fish. These changes demonstrate the highresponse capacity of the protein-turnover rates in trout liver upon re-feeding after long-term starvation. Upon re-feeding hypertrophic growth increased considerably whilst hyperplasia remained at starvation levels.

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Documento generato il 24/11/20 alle ore 09:39:40