Increased 24 h mean insulin-like growth factor binding protein-3 proteolytic activity in pubertal type 1 diabetic boys
| Autor: | Kerstin Brismar, M Wallensteen, Peter Bang, I Zachrisson, Gisela Dahlquist, Christine Carlsson-Skwirut |
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| Rok vydání: | 2001 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_specialty Time Factors Adolescent Endocrinology Diabetes and Metabolism medicine.medical_treatment Insulin-like growth factor-binding protein Endocrinology Insulin resistance Internal medicine Statistical significance Diabetes mellitus medicine Glucose homeostasis Humans Insulin Insulin-Like Growth Factor I Child Glycemic Type 1 diabetes biology business.industry Growth factor medicine.disease Diabetes Mellitus Type 1 Insulin-Like Growth Factor Binding Protein 3 Case-Control Studies biology.protein Insulin Resistance business |
| Zdroj: | Growth hormoneIGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society. 10(6) |
| ISSN: | 1096-6374 |
| Popis: | Hyperglycaemia and increased variability of blood glucose in pubertal children with type 1 diabetes may be related to increased growth hormone (GH) secretion and insulin resistance. The role of changes in insulin-like growth factor-I (IGF-I) bioavailability for the glycaemic control in these patients has not been completely elucidated. In particular, the possible role of increased IGF binding protein-3 (IGFBP-3) proteolysis reported in other insulin resistant states awaits further characterization. The aims of this study were to assess if hyperglycaemia in children with type 1 diabetes was associated with changes in free dissociable IGF-I (fdIGF-I) and IGF binding protein-3 protease activity (IGFBP-3-PA) and if increased insulin resistance during puberty was associated with changes in IGFBP-3-PA in healthy and diabetic children. In diabetic boys in the period of maximal linear growth (Tanner stage 3, n = 5), the mean level and the variability of IGFBP-3-PA, determined every second hour throughout 24 h, were significantly higher both compared to postpubertal diabetic boys (n = 6; P = 0.003 and P = 0.001, respectively), and to age matched healthy boys (n = 4; P = 0.006 and P < 0.001 respectively). This activation of IGFBP-3-PA was most prominent during the day time. The mean 24 h blood glucose level (determined hourly) was the only parameter studied that significantly predicted the changes in mean 24 h IGFBP-3-PA in the diabetes group. The mean 24 h concentrations of fdIGF-I were decreased in the diabetic boys compared to the healthy controls but statistical significance was only achieved in Tanner Stage 5 (p = 0.03). We speculate that the elevated levels of IGFBP-3-PA in Tanner 3 diabetic boys are related to deteriorated glucose homeostasis and that it may be a compensatory mechanism to attenuate the decrease in fdIGF-I in order to partly restore insulin sensitivity and glycemic control. |
| Databáze: | OpenAIRE |
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