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growth hormone for Human Growth Hormone Deficiency
Study Summary
The purpose of the proposed study is to investigate the effects of rhGH treatment on glucose, protein and fat metabolism in GHD children. Specifically, the investigators will measure the rates of glucose production, gluconeogenesis, glycogenolysis, insulin sensitivity and glucagon response before and after treatment with rhGH. In addition, the investigators will study changes in protein and fat metabolism pre and post rhGH therapy in children with GHD. The findings in the GHD children will be compared to those of a control group of age and sex matched healthy children. Hypotheses: H1- The fraction of glucose derived from gluconeogenesis is decreased and that from glycogenolysis is increased in the post-absorptive state in untreated GHD children when compared to healthy children. H2- Treatment with rhGH will not change the overall glucose turnover but will normalize the abnormal partitioning of gluconeogenesis and glycogenolysis in GHD children. H3- GH replacement will reduce urea production and increase estimates of protein synthesis, thus optimizing the availability of amino acids for growth. H4- Untreated children with GHD after an overnight fast will have an increased glucagon challenge response that will decrease after 8 weeks of treatment with rhGH. Specific Aims: In healthy and newly diagnosed GHD children the investigators will: 1. Measure the Glucose Production Rate (GPR) 2. Determine the fraction of glucose derived from gluconeogenesis and glycogenolysis 3. Estimate insulin sensitivity 4. Measure proteolysis and protein oxidation 5. Determine glucagon challenge response after an overnight fast. The above-mentioned parameters will be re-evaluated in the children with GHD after 8 weeks of rhGH therapy.
- Human Growth Hormone Deficiency
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