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. 1994 Sep;220(3):310–319. doi: 10.1097/00000658-199409000-00007

Insulin-like growth factor-1 lowers protein oxidation in patients with thermal injury.

W G Cioffi 1, D C Gore 1, L W Rue 3rd 1, G Carrougher 1, H P Guler 1, W F McManus 1, B A Pruitt Jr 1
PMCID: PMC1234384  PMID: 8092898

Abstract

OBJECTIVE: The effect of insulin-like growth factor-1 (IGF-1) on energy expenditure and protein and glucose metabolism in a group of patients with thermal injury was determined. SUMMARY BACKGROUND DATA: Accelerated protein catabolism is a constant feature of the hypermetabolic response to thermal injury. Insulin-like growth factor-1 has been reported to minimize protein catabolism and normalize energy expenditure in animal models of thermal injury. METHODS: To determine the efficacy of IGF-1 in human burn patients, resting energy expenditure (metabolic cart), whole body protein kinetics (N15 Lysine), and glucose disposal (glucose tolerance test) were assessed in eight burn patients before and after a 3-day infusion of IGF-1 (20 micrograms/kg/hr). All patients were fluid-resuscitated uneventfully and were without obvious infection at the time of study. Enteral nutrition was administered at a constant rate before and during the IGF-1 infusion. RESULTS: Resting energy expenditure was not altered by IGF-1 (40.3 +/- 2.2 vs. 39.1 +/- 2.3 kcal/kg/day). However, glucose uptake was promoted, and protein oxidation decreased significantly (0.118 +/- 0.029 vs. 0.087 +/- 0.021 g/kg/d, p < 0.05) by IGF-1. In addition, insulin secretion, in response to a glucose challenge, was blunted. CONCLUSIONS: Insulin-like growth factor-1 therapy has a beneficial effect in preserving lean body mass during severe stress conditions by minimizing the flux of amino acids toward oxidation.

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Selected References

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