Insulin-dependent regulation of insulin-like growth factor-binding protein-1

The Journal of Clinical Endocrinology and Metabolism
D K Snyder, D R Clemmons

Abstract

In previous studies it has been determined that food ingestion or glucose infusion suppresses serum insulin-like growth factor-binding protein-1 (IGFBP-1) concentrations in normal subjects. It has not been determined, however, whether glucose-dependent suppression is due to enhancement of insulin-stimulated glucose transport, to some other insulin-mediated effect, or to a direct effect of glucose. These studies were undertaken to determine if infusion of other nutrients or energy sources that activate glycolysis, but not insulin secretion, could lead to suppression of the plasma concentrations of this protein. After infusion of 50 g glucose over 4 h, the mean plasma IGFBP-1 concentration fell from 44.3 +/- 13.8 to 17.4 +/- 8.1 micrograms/L (P less than 0.001). In contrast, when 50 g fructose were infused over 4 h, IGFBP-1 decreased from 44.6 +/- 7.4 to only 32.7 +/- 6.7 micrograms/L (P less than 0.01). Comparison of these changes showed that the mean decrease after glucose infusion was significantly greater than that after fructose (P less than 0.01). In contrast to these decreases, infusion of an isocaloric amount of triglycerides resulted in no significant change in IGFBP-1 concentrations (from 49.8 +/- 14.1 to 40.2 + 10.4 mi...Continue Reading

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