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- W2040941129 abstract "Chronic metabolic acidosis (CMA) is a major cause of growth defect, implying disturbances of protein metabolism. Previously, in vivo studies performed in the fasting state showed enhanced whole body protein turnover, whereas in vitro studies showed unchanged muscle protein synthesis. The present study is the first to determine the effects of CMA on muscle protein synthesis and degradation in vivo. Two studies were performed in 60 g male rats fed a 30% casein diet. In study I, one group was sham-operated (C rats), and two groups underwent subtotal nephrectomy. One of them developed acidosis (UA rats) which was corrected in the other by NaHCO3 in the diet (UNA rats). Study II compared sham-operated rats rendered acidotic by NH4Cl in the drinking water (CA rats) and normal pair-fed (CNA) rats. Fractional protein synthesis rate (FSR) was determined in gastrocnemius muscle after injection of 3H-phenylalanine. Fractional protein degradation rate (FDR) was calculated as FSR minus fractional rate of muscle growth (FGR). In study I, UA rats had lower growth and N balance (163 +/- 12 vs. 216 +/- 11 mg N/day; P < 0.001) than UNA rats, despite identical food intake (11 g/day). This was associated with identical FSR (10.4 +/- 0.5 vs. 10.9 +/- 0.5%/day), but enhanced protein degradation (6.30 +/- 0.99 vs. 5.10 +/- 0.71%/day; P < 0.05). Plasma insulin, C peptide, PTH and corticosterone did not differ in UA and UNA rats, whereas plasma IGF-I was markedly reduced (147 +/- 21 vs. 283 +/- 27 ng/ml; P < 0.01) in UA rats.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2040941129 date "1994-12-01" @default.
- W2040941129 modified "2023-10-17" @default.
- W2040941129 title "In vivo unaltered muscle protein synthesis in experimental chronic metabolic acidosis" @default.
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- W2040941129 doi "https://doi.org/10.1038/ki.1994.472" @default.
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