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To clarify the influence of nutrition on the GH-IGF axis in protein-energy malnutrition (PEM), we determined the serum levels of GH, GH-binding proteins (BP) (GHBPs), IGF-I, and IGFBPs in nine children with kwashiorkor and 13 with marasmus, before and after nutritional rehabilitation. In a basal condition, the GH level was significantly higher in the two malnourished groups than in controls (p &lt; 0.01); in contrast, the second fraction of GHBP was lower and seemed to be related to the high GH and to a reduction in GH receptors. After refeeding, the GH level increased and the second fraction of GHBP decreased. The IGF-I basal level was higher in kwashiorkor than in marasmus subjects (p &lt; 0.05), but in both groups it was significantly lower than in controls (p &lt; 0.01); after refeeding it increased. IG-FBP-3, measured by RIA and Western blotting techniques, was in the control range in the kwashiorkor group but in the marasmic group it was significantly lower than in controls; after refeeding it decreased in kwashiorkor (p &lt; 0.01 versus basal values) and increased in marasmus (p &lt; 0.05 versus prerefeeding level). When sera of malnourished patients were mixed with adult control sera, incubated for 5 h at 37 degrees C, and assessed by ligand blotting, a low IGFBP-3 level in marasmus was found to be due to increased adaptive proteolysis of IGFBP-3; in contrast, in kwashiorkor the IGFBP-3 proteolytic activity was very low, probably because of inhibition by aflatoxins. These findings confirm that malnutrition affects the GH-IGF axis.

pediatric research

Growth Hormone-Binding Proteins and Insulin-Like Growth Factor-Binding Proteins in Protein-Energy Malnutrition, before and after Nutritional Rehabilitation