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 growth in 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 (AS) also fell, whilst the fractional protein-synthesis rate (KS) remained unchanged and the fractional protein-degradation rate (KD) 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 (KG, AG) rose sharply, as did KS, AS, KD, protein-synthesis efficiency (KRNA) and the protein-synthesis rate/DNA unit (KDNA). The total hepatic protein and RNA contents increased but still remained below the control values. The protein:DNA and RNA:DNA ratios increased significantly compared to starved fish. These changes demonstrate the high response 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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Peragón, J., Barroso, J.B., García-Salguero, L. 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 Cell Biochem 201, 1–10 (1999). https://doi.org/10.1023/A:1006953917697
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DOI: https://doi.org/10.1023/A:1006953917697