Chronic administration of growth hormone (GH) to adult chickens exerts marked effects on circulating concentrations of insulin-like growth factor-I (IGF-I), IGF binding proteins, hepatic GH regulated gene I, and hepatic GH receptor mRNA

被引:0
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作者
Steven V. Radecki
Lisa McCann-Levorse
Sunita K. Agarwal
Joan Burnside
John A. Proudman
Colin G. Scanes
机构
[1] Rutgers—The State University of New Jersey,Department of Animal Science
[2] University of Delaware,Department of Animal Science and Agriculture Biochemistry
[3] U.S. Department of Agriculture,Germplasm and Gamete Physiology Laboratory, Agricultural Research Service
[4] Iowa State University,College of Agriculture
来源
Endocrine | 1997年 / 6卷
关键词
Growth hormone (GH); chicken; insulin-like growth factor-I (IGF-I); IGF binding proteins; GH receptor;
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学科分类号
摘要
In young birds, growth hormone (GH) administration has been found to have only a small or even no effect on circulating concentrations of insulin-like growth factor-I (IGF-I). This is in obvious contrast to the situation in mammals. The present study examines the effect of continuous administration of GH in adult male chickens. Plasma concentrations of IGF-I were markedly elevated (2.5–3.0-fold,p<0.001) in GH-treated chickens. There were also some transient increases in the circulating levels of IGF binding proteins. Adult chickens showed other manifestations of increased responsiveness to GH, including elevated hepatic expression of GH-regulated gene-I (mRNA) with GH treatment (p<0.05), and a tendency (p<0.08) for decreased GH-receptor mRNA. In contrast to the changes in circulating concentrations of GH and IGF-I with GH treatment, no changes in plasma concentrations of thyroid hormones, reproductive hormones, glucose, or nonesterified fatty acids were evident.
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页码:117 / 124
页数:7
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