Altered relation between circulating levels of insulin-like growth factor-binding protein-1 and insulin in growth hormone-deficient patients and insulin-dependent diabetic patients compared to that in healthy subjects

The Journal of Clinical Endocrinology and Metabolism
A HildingK Hall

Abstract

To investigate whether previously reported increased levels of insulin-like growth factor-binding protein-1 (IGFBP-1) in GH-deficient patients only reflect decreased levels of insulin or are elevated in relation to insulin, diurnal profiles of IGFBP-1 and insulin were determined in plasma from patients with GH levels below 0.2 microgram/L throughout 24 h (n = 23) and compared to profiles from patients with insulin-dependent diabetes mellitus (IDDM; n = 9) and healthy subjects (n = 12). Samples were drawn using a continuous withdrawal technique at 20-min intervals. Levels of IGF-I were determined in one morning sample. As in healthy subjects, serum IGFBP-1 displayed a diurnal variation in GH-deficient as well as in IDDM patients, with lowest levels in the afternoon and evening and a rise with maximum levels during the night and morning. Fasting and 24-h mean levels of IGFBP-1 were significantly higher in GH-deficient patients [61 +/- 12 (P < 0.01) and 39 +/- 6 micrograms/L (P < 0.01), respectively] and IDDM patients [72 +/- 18 (P < 0.01) and 45 +/- 9 micrograms/L (P < 0.01), respectively] compared to those in healthy subjects (27 +/- 4 and 18 +/- 2 micrograms/L, respectively). Fasting levels of IGFBP-1 correlated to 24-h mean va...Continue Reading

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