Abnormal regulation of insulin-like growth factor binding proteins in adolescents with insulin-dependent diabetes

J Clin Endocrinol Metab. 1991 Nov;73(5):964-8. doi: 10.1210/jcem-73-5-964.

Abstract

We have measured fasting 0800 h insulin-like growth factor binding proteins (IGFBP)-1 and IGFBP-3, in 52 diabetic adolescents and 74 puberty-matched control subjects with short stature and normal hormonal status. We have also measured overnight hourly profiles of IGFBP-1, glucose, free insulin, and GH in 12 of the diabetic adolescents. With advancing age and pubertal status, IGFBP-1 declined and IGFBP-3 increased significantly in the control, but not the diabetic group. Fasting IGFBP-1 levels were elevated 4-fold compared to controls. Median IGFBP-3 was significantly lower in the diabetic compared to the control group in pubertal stages III and V. Elevated IGFBP-1 was significantly correlated with metabolic control in poorly controlled subjects (mean 12-month glycosylated haemoglobin greater than 8.5%). In the overnight profiles, mean hourly IGFBP-1 was inversely related to insulin, but not glucose. As free insulin levels declined, IGFBP-1 rose, associated with rising predawn blood sugars. The integrated 3-h IGFBP-1 value (0500-0800 h) was significantly correlated with the corresponding glucose integrated value. IGFBP-1 area under the curve for the whole overnight profile was significantly correlated with glycosylated hemoglobin in 11 of the 12 subjects. IGFBP-1 from diabetic adolescents has been shown to inhibit IGF-I bioactivity. We postulate that IGFBP-1 may have a role in growth impairment of poorly controlled diabetes and may contribute to the dawn phenomenon.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Blood Glucose / metabolism
  • Carrier Proteins / blood*
  • Diabetes Mellitus, Type 1 / blood*
  • Fasting
  • Female
  • Glycated Hemoglobin A / analysis
  • Humans
  • Insulin / blood
  • Insulin-Like Growth Factor Binding Proteins
  • Insulin-Like Growth Factor I / metabolism*
  • Male
  • Puberty
  • Reference Values

Substances

  • Blood Glucose
  • Carrier Proteins
  • Glycated Hemoglobin A
  • Insulin
  • Insulin-Like Growth Factor Binding Proteins
  • Insulin-Like Growth Factor I