Effect of rhIGF-I infusion on whole fetal and fetal skeletal muscle protein metabolism in sheep

被引:15
作者
Boyle, DW
Denne, SC
Moorehead, H
Lee, WH
Bowsher, RR
Liechty, EA
机构
[1] Indiana Univ, Sch Med, Dept Pediat, Herman B Wells Ctr Pediat Res, Indianapolis, IN 46202 USA
[2] Eli Lilly Res Labs, Indianapolis, IN 46202 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM | 1998年 / 275卷 / 06期
关键词
phenylalanine; leucine; amino acid kinetics; hindlimb metabolism; glucose uptake; oxygen uptake; recombinant human insulin-like growth factor I;
D O I
10.1152/ajpendo.1998.275.6.E1082
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Insulin-like growth factor I (IGF-I) has been shown to have significant anabolic effects in the regulation of fetal protein metabolism. To investigate the tissue-specific effects of IGF-I on fetal skeletal muscle metabolism, we infused recombinant human (rh) IGF-I directly into the hindlimb of nine chronically catheterized, late-gestation fetal sheep. Substrate balance and amino acid kinetics were measured across the hindlimb and were compared with the effects at the whole body level before and during a 3-h infusion of rhIGF-I into the external iliac artery at 150 mu g/h. Infusion of rhIGF-I resulted in increases in IGF-I concentrations by 2- to 5.75-fold in the ipsilateral iliac vein and by nearly 3-fold in the abdominal aorta. In the study limb, IGF-I had no effect on protein synthesis (phenylalanine rate of disposal 0.88 +/- 0.13 before vs. 0.73 +/- 0.19 mu mol/min during IGF-I) or breakdown (phenylalanine rate of appearance 0.67 +/- 0.13 before vs. 0.60 +/- 0.17 mu mol/min during IGF-I) and did not alter net phenylalanine balance. IGF-I also did not affect hindlimb oxygen or glucose uptake. In contrast, at the whole body level, the rate of appearance of leucine, indicative of fetal protein breakdown, decreased during IGF-I infusion (rate of appearance of leucine 41.1 +/- 3.3 to 37.6 +/- 2.7 mu mol/min) as did fetal leucine oxidation (8.4 +/- 0.8 to 6.8 +/- 0.6 mu mol/min). There was no change in the umbilical uptake of leucine, and although not statistically significant, fetal leucine accretion increased 2.4-fold. These results provide further evidence that IGF-I promotes fetal protein accretion; however, its site of action is in tissues other than skeletal muscle.
引用
收藏
页码:E1082 / E1091
页数:10
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