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- W2371983792 abstract "Effects of three kinds of nutritional status on tissue IGF Ⅰ mRNA expression in juvenile Common carp ( Cyprinus carpio ) were studied by prolonged outdoor feeding. One group of fish was fed with food containing 40% Casein (H group); another group was fed with food containing 20% Casein (L group). Two kinds of food contain the same amount of energy. The last group of fish was fasted until the 32th day, then fed with food containing 40% Casein (Starvation group). During the experiment, the growth of starved fish was less than half of that of the L group fish on the 32th day, though no significant change of IGF Ⅰ mRNA amount in other tissues was observed. Growth and hepatic IGF Ⅰ mRNA level in fasted fish began to gradually be restored after being fed again with food containing 40% Casein. Like previous studies by other researchers, during starvation the serum growth hormone level increased significantly and two week refeeding restored it to normal. Even though the growth rate in L group fish was lower than that of H group fish, no statistically significant difference was found between the two group fish after 40 day's feeding. Also, no obvious differences in the serum growth hormone level and hepatic IGF Ⅰ mRNA amount between the two group was discovered even on the 32th day. The results suggest that in juvenile Common carp, live in other fishes and mammals, nutrition should be also a regulator of the hepatic IGF Ⅰ mRNA expression. Lack of nutrition depresses the hepatic IGF Ⅰ mRNA expression, which was most likely to lead to the decrease of serum IGF Ⅰ level, and the latter in turn retard growth in juvenile Common carp. When the nutrition was restored, the hepatic IGF Ⅰ mRNA was also restored, which would probably lead to the restoration of growth. The results suggest the non hepatic IGF Ⅰ mRNA expression should be independent of the nutritional status as in other reported fishes. In addition, because no differences in growth status and hepatic IGF Ⅰ mRNA expression were observed between H group and L group on the 32th day, it is conceivable that the total energy of food may be an important factor in modulate hepatic IGF Ⅰ mRNA expression as reported in mammals, and the food containing normal energy and 20% Casein already can maintain a high level of hepatic IGF Ⅰ expression. Alternatively, 32 days perhaps is not long enough for the two nutritional status to show fully the different effects on hepatic IGF Ⅰ mRNA expression of the two group of fishes." @default.
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- W2371983792 date "2001-01-01" @default.
- W2371983792 modified "2023-09-25" @default.
- W2371983792 title "EFFECTS OF DIFFERENT NUTRITIONAL STATUS ON EXPRESSION OF IGF-I mRNA IN IMMATURE COMMON CARP LIVER" @default.
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