Les vitesses de renouvellement des proteines hepatiques, musculaires et plasmatiques de la carpe (Cyprinus carpio) soumise a un jeune total et prolonge

Short-term accumulation and elimination of carbon-14 in the common carp Cyprinus carpio under laboratory conditions

“…Results also showed that minor fractions of assimilated 14C-labelled arginine (ranging from 14 to 20%) were finally incorporated to whole body, implying that a major part was catabolized and released as 14CO2 via respiration. This result was in good agreement with previous studies on metabolism of 14C-labelled aminoacids (including essential lysine and non-essential glutamate) and glucose in C. carpio (Bouche & Vellas, 1975;Nagai & Ikeda, 1971b). Authors reported that a significant fraction (45%) of glutamate activity injected into blood was released as 14CO2 within 6 h, while a minor fraction (7% only) were stored as hepatic glycerides.…”

“…In our study, results suggested that arginine incorporation differed between direct and trophic experiments (14.3 and 18.6% respectively), suggesting a greater arginine storage when carps were fed than when they were starved. This interpretation was supported by previous results showing that starved carps stopped storing another essential amino-acid (14C-labelled lysine) (Bouche & Vellas, 1975). The present study reported approximately similar proportions of incorporation with 14C-labelled glucose as with arginine (20% and 19% of ingested activity), suggesting again that a major fraction of glucose was released via respiration or other metabolic paths during trophic experiments.…”

“…Results showed that activity of 14C-labelled arginine decreased in starved carps, whereas no similar decrease was observed with 14C-labelled glucose. This suggested that carps stored arginine under favourable food conditions and were able to mobilize it during starvation, confirming the role of amino-acids (including essential amino-acids, like lysine or arginine) as an energy source (Bouche & Vellas, 1975;Enes et al, 2009). Other authors pointed the role of muscle as a storage organ for amino-acids in C. carpio.…”

“…In this context, the present study aims to investigate direct and trophic 14C transfer in the common carp Cyprinus carpio, as a representative species inhabiting French rivers. Furthermore, accumulation and elimination kinetics might vary depending on the biochemical form of 14C and this hypothesis is tested using various 14C sources, including arginine (an essential amino acid for carps) and glucose (an important source of energy in a majority of animal species) (Bouche & Vellas, 1975;Murai et al, 1986;Nagai & Ikeda, 1971a, 1971bRanson, 2003).…”

Amino acid transport and interconversions in tissues of freshly caught and food‐deprived plaice, Pleuronectes platessa L.

“…Walker (197 1) found extensive white, but not red, fibre atrophy in deprived cod. There is support for white muscle acting as a store of amino acids during longterm food scarcity at least in carp (Creach & Serfaty, 1974;Bouche & Vellas, 1975) and white muscle protein quantities decline in many fish with food deprivation (Love, 1970;Johnston & Goldspink, 1973;Creach & Serfaty, 1974;Patterson et al, 1974;Bouche & Vellas, 1975). The mobilization of muscle protein is linked to tissue transaminases catalyzing amino acid inter-conversions (Creach & Serfaty, 1974;Cowey & Sargent, 1979).…”