A dose-response study of growth hormone (GH) replacement on whole body protein and lipid kinetics in GH-deficient adults

被引:62
作者
Lucidi, P
Lauteri, M
Laureti, S
Celleno, R
Santoni, S
Volpi, E
Angeletti, G
Santeusanio, F
De Feo, P
机构
[1] Univ Perugia, Dept Internal Med Endocrine & Metab Sci, I-06100 Perugia, Italy
[2] CNR, Inst Agroforestry, Porano, Italy
关键词
D O I
10.1210/jc.83.2.353
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
This study was designed to establish the lower dose of effective GH replacement therapy in severe GK-deficient (GHD) adults. Whole body protein and lipid kinetics were determined in six GHD men in the basal state (B) and after 1 week of treatment with placebo (PL) or 3.3 (GH3.3) or 2 (GH2) mu g/kg.day recombinant human GH (rhGH). The rates of whole body proteolysis, oxidation, and synthesis were estimated by infusing [1-C-13]leucine (prime, 1 mg/kg; infusion rate, 1 mg/kg.h); those of lipolysis (measured in four of the six patients) were estimated by infusing [1,1,2,3,3-D-5]glycerol (prime, 1.8 mu mol/kg; infusion rate, 0.06 mu mol/kg.min). Serum insulin-like growth factor I (IGF-I) concentrations (picograms per mL; mean +/- SE) similarly increased from the basal level (39 +/- 7) after 3.3 (108 +/- 18) or 2 (109 +/- 24) mu g/kg day rhGH (P < 0.001 vs. basal), whereas they did not change with placebo (41 +/- 8). Leucine Ra was unaffected by the treatments. GH3.3 reduced by 30% the rate of leucine oxidation (P = 0.0069 vs. basal) and increased by 11% nonoxidative leucine disposal (P = 0.0095 vs. basal) and by 21% glycerol Ra (0.0035 vs. basal); GH2 and placebo had no significant effect. In conclusion, 1) at least 3.3 mu g/kg.day rhGH are required to increase whole body protein synthesis and lipolysis in male GHD adults; 2) 2 mu g/kg.day rhGH normalize serum IGF-I concentrations, but do not modify protein and lipid metabolism; and 3) a normal serum IGF-I concentration does not guarantee that rhGH treatment is also effective on intermediate metabolism.
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收藏
页码:353 / 357
页数:5
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