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Studies on the influence of nutrition on the rate of protein synthesis and insulin-like growth factor-I in the chicken

Research Project

Project/Area Number 08456140
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied animal science
Research InstitutionNagoya University

Principal Investigator

OKUMURA Jun-ichi  Nagoya University, Professor, 農学部, 教授 (10023425)

Co-Investigator(Kenkyū-buntansha) KITA Kazumi  Nagoya University, Assistant Professor, 農学部, 助手 (20221913)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1996: ¥5,700,000 (Direct Cost: ¥5,700,000)
KeywordsChicken / Protein synthesis / Insulin-like growth factor-I / Muscle / Liver / Protein / Carbohydrate / Fat / インシュリン様増殖因子I / 絶食
Research Abstract

It has been reported that refeeding rapidly increases protein synthesis in fasted chickens and that plasma insulin-like growth factor-I (IGF-I) concentration is also very sensitive to the alteration in nutritional status. In the present study, we investigated the relationship of plasma IGF-I concentration and hepatic IGF-I mRNA level to the rate of tissue protein synthesis under various nutritional conditions. The rate of tissue protein synthesis was measured by a large dose injection of [^3H]-phenylalanine. Plasma IGF-I concentration was measured by radioimmunoassay. Hepatic IGF-I mRNA was quantified by ribonuclease protection assay. Plasma IGF-I concentration increased from 1 to 6 weeks of age, and the reduction of plasma IGF-I concentration was observed in fasted chicks. Both muscle protein synthesis and hepatic IGF-I mRNA level were decreased by 1-day fasting in 1-and 2-week-old chicks, and the amount of protein synthesized in muscles positively correlated to the change in hepatic IGF-I mRNA levels. On 15 days of age, chicks were fasted for 2 days and then refed with the combination of protein, carbohydrate and fat. After 30 minutes of refeeding the rates of muscle and liver protein synthesis and plasma IGF-I concentration were measured. No interaction of refeeding of various nutrients was observed in liver and muscle protein synthesis. The rate of protein synthesis, which has been decreased by fasting, was increased by individual nutrient refeeding. Plasma IGF-I concentration was decreased by fasting, and no change was observed in plasma IGF-I after 30 minutes of refeeding with various nutrients. These results suggested that acute increase in muscle protein synthesis by refeeding in fasted chicks is not associated to the change in plasma IGF-I concentration.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Kazumi Kita: "Influence of fasting on plasma insulin-like growth factor-I concentration in chickens at early stages of growth." Japanese Poultry Science. 34・6. 410-413 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kazumi Kita: "Influence of fasting on plasma insulin-like growth factor-I concentration in chickens at early stages of growth." Japanese Poultry Science. 34 (6). 410-413 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kazumi Kita: "Influence of fasting on.plasma insulin-like growth factor-I concentration in chickens at early stages of growth" Japaneses Poultry Science. 34.6. 410-413 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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