Abstract
The causes for growth failure in children with idiopathic short stature (ISS) are not definitely established. Peripheral GH resistance due to changes at the level of the GH receptor has been suggested as one of the most probable explanation. In this study, we have selected a group of prepubertal children with ISS to evaluate the GHBP/receptor status by measuring the GH binding protein (GHBP) activity in plasma. Thirty prepubertal children with ISS (18 boys and 12 girls; age range: 4.79 to 11.33 yr) and twenty age-matched children with normal growth (11 boys and 9 girls) were studied. The ISS group presented growth retardation of −2.3±0.43 SD score (mean±SD) and normal GH secretion. Plasma IGF-I levels were below or in the low normal range (mean±SD: 136.3±62.3 μg/l, a concentration that was significantly different from IGF-I levels in the normal group (mean±SD: 187±57.5 μg/l p<0.005). Plasma GHBP activity using a GH-binding/gel chromatography assay showed significantly lower values in ISS group (mean±SD: 7.17±1.5%) as compared with those of the control group (mean±SD: 12.02±2.04%; p<0.001). There were no significant age-or sex-related differences in GHBP values in either group. The decreased GHBP levels observed in this group of children with ISS suggest that they may present a certain degree of GH insensitivity, probably due to a defect at the GH-receptor level.
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Dávila, N., Moreira-Andrés, M., Alcañiz, J. et al. Serum growth hormone-binding protein is decreased in prepubertal children with idiopathic short stature. J Endocrinol Invest 19, 348–352 (1996). https://doi.org/10.1007/BF03344968
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DOI: https://doi.org/10.1007/BF03344968