Suppression of Myofibrillar Protein Degradation after Refeeding in Young and Adult Mice
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- NAGASAWA Takashi
- Food and Health Science, Faculty of Agriculture, Iwate University
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- KIKUCHI Nobuhiro
- Food and Health Science, Faculty of Agriculture, Iwate University
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- ITO Yoshiaki
- Food and Health Science, Faculty of Agriculture, Iwate University
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- YOSHIZAWA Fumiaki
- Department of Animal Science, Faculty of Agriculture, Utsunomiya University
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- NISHIZAWA Naoyuki
- Food and Health Science, Faculty of Agriculture, Iwate University
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Description
A diet containing adequate amounts of protein rapidly suppresses myofibrillar protein degradation after refeeding in young rats and mice. However, it is unclear whether this suppression is seen in adult animals. This study was undertaken to compare dietary protein-induced suppression of myofibrillar protein degradation in young and adult mice. Reductions in rates of myofibrillar protein degradation measured by NT-methylhistidine (MeHis) released from the isolated extensor digitorum longus muscle were found at 4 to 7h after refeeding in both young (7-wk-old) and adult (8-mo-old) mice, indicating that the response time of feeding-induced suppression of myofibrillar protein degradation was the same. When young (8-wk-old) mice were fed a 20% casein diet (20C) for 1 h after 18h starvation, the rate of myofibrillar protein degradation was significantly decreased at 4 h after refeeding; however, mice fed a 10% casein diet (10C), 5% casein diet (5C), or protein-free diet (0C) did not show suppression of myofibrillar protein degradation. Adult (8-mo-old) mice fed 20C or 10C showed a reduction in the rate of MeHis release. The plasma concentration of leucine in young mice was only higher when they were fed 20C. Adult mice fed 20C or 10C showed higher plasma concentrations of leucine. These results suggest that postprandial suppression of myofibrillar protein degradation occurs in adult mice as in young mice, but the adult mice respond to a lower amount of dietary casein compared to the young mice.
Journal
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- Journal of Nutritional Science and Vitaminology
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Journal of Nutritional Science and Vitaminology 50 (3), 227-230, 2004
Center for Academic Publications Japan
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Details 詳細情報について
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- CRID
- 1390282681300572032
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- NII Article ID
- 110002703991
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- NII Book ID
- AA00703822
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- COI
- 1:CAS:528:DC%2BD2cXlvFKlsrs%3D
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- ISSN
- 18817742
- 03014800
- http://id.crossref.org/issn/03014800
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- NDL BIB ID
- 7005925
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- PubMed
- 15386937
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL Search
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed