Document Detail


Decreased serum insulin-like growth factor-I in burn patients: relationship with serum insulin-like growth factor binding protein-3 proteolysis and the influence of lipid composition in nutritional support.
MedLine Citation:
PMID:  10921566     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To test the effects of the amount and type of fat in the nutritional support on serum insulin-like growth factor (IGF)-I concentrations in burn patients and to test the hypothesis that the serum proteolytic activity for insulin-like growth factor binding protein (IGFBP)-3 is a major mechanism for the decreased serum IGF-I observed in these patients. DESIGN: Randomized, double-blind trial of three different nutritional supports and analysis of serum IGF-I, IGFBP-3, and serum IGFBP-3 proteolysis. SETTING: Burn center in a university hospital. PATIENTS: A total of 23 severely burned (>25% total body surface area burned) adult patients. INTERVENTIONS: Patients were randomly assigned to three types of nutritional support differing in the amount of energy derived from fat and the presence or absence of fish oil: Group I (control), 35% fat; Group II, 15% fat; Group III, 15% fat with 50% as fish oil. Nutritional support was both parenteral and enteral and was started within 24 hrs of admission. MEASUREMENTS AND MAIN RESULTS: Serum IGF-I and IGFBP-3 were measured by radioimmunoassay every 3 days for 28 days in 23 severely burned adults. In six patients, IGFBP-3 was measured by ligand binding assay and the serum proteolytic activity for rhIGFBP-3 was measured as well. Serum IGF-I concentration was low in all subjects throughout the study period, but did increase with time (p < .01); significantly higher values were found in Group III (p < .05). Multivariate analysis showed that fish oil and low fat solutions were significantly correlated to serum IGF-I concentrations. Serum IGFBP-3 (radioimmunoassay) was higher than normal throughout the study with no difference between the groups. Between days 4 and 16, IGFBP-3 was cleaved into two fragments in all patients studied, and the molecular weights of the fragments were equal to those observed in the serum of a woman late in pregnancy. During this period of time, serum proteolytic activity for rhIGFBP-3 was >30% in 24 of the 30 samples measured, whereas 20 of the 28 samples measured thereafter were normal (<25%). Serum IGFBP-3 concentration from ligand binding assay was correlated with serum proteolytic capacity in all subjects (mean r2 = 0.77; p < .01) and with serum IGF-I concentrations in five of six subjects (mean r2 = 0.81; p < .01). CONCLUSIONS: In burn injury, serum IGF-I concentrations are sensitive to the amount and type of fat in their nutritional support. The presence of fish oil allowed for a more rapid recovery of serum IGF-I levels. The proteolysis of IGFBP-3 may be an important cause of the decreased serum IGF-I values and the protease(s) responsible for this seem to be similar to those observed in late pregnancy.
Authors:
T Abribat; B Nedelec; N Jobin; D R Garrel
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Critical care medicine     Volume:  28     ISSN:  0090-3493     ISO Abbreviation:  Crit. Care Med.     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-08-16     Completed Date:  2000-08-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0355501     Medline TA:  Crit Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2366-72     Citation Subset:  AIM; IM    
Affiliation:
Burn Centre, Hotel-Dieu Hospital, Montréal, Québec, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adult
Burn Units
Burns / blood*,  therapy*
Dietary Fats / administration & dosage*
Double-Blind Method
Enteral Nutrition*
Fatty Acids, Omega-3 / administration & dosage,  pharmacology*
Female
Humans
Injury Severity Score
Insulin-Like Growth Factor Binding Protein 3 / blood*
Insulin-Like Growth Factor I / metabolism*
Male
Methylhistidines / urine
Parenteral Nutrition*
Radioimmunoassay
Chemical
Reg. No./Substance:
0/Dietary Fats; 0/Fatty Acids, Omega-3; 0/Insulin-Like Growth Factor Binding Protein 3; 0/Methylhistidines; 368-16-1/3-methylhistidine; 67763-96-6/Insulin-Like Growth Factor I

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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