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High-affinity growth hormone binding protein, insulin-like growth factor I and insulin-like growth factor binding protein 3 in adults with growth hormone deficiency. 1996

C A Roelen, and H P Koppeschaar, and W R de Vries, and P M Zelissen, and Y E Snel, and M E Doerga, and J H Thijssen, and R A Blankenstein
Department of Endocrinology, University Hospital Utrecht, The Netherlands.

The high-affinity growth hormone binding protein (GHBP) circulates in human blood and represents the extracellular domain of the growth hormone (GH) receptor. The effects of GH deficiency on GHBP in adults are not clear. The aim of this study was to evaluate serum GHBP levels in adults with GH deficiency and to assess whether GHBP measurement may contribute to the diagnosis of adult GH deficiency, based on a two-step model. We measured insulin-like growth factor I (IGF-I), IGF binding protein 3 (IGFBP-3) and GHBP levels in serum samples of 36 patients with adult-onset GH deficiency. The GHBP levels were measured by FPLC size-exclusion chromatography; IGF-I and IGFBP-3 levels were measured by RIA. Serum GHBP levels were elevated above the upper limit of the 95% confidence interval in 26 patients, whereas IGF-I and IGFBP-3 levels were low in 10 patients and in 16 patients, respectively. The combination of low serum IGF-I and low IGFBP-3 levels was found in 10 patients. In nine patients, serum IGF-I levels were low, with elevated GHBP levels. Low serum IGF-I, low IGFBP-3 and elevated GHBP levels were found in five patients. Only four out of 36 patients had serum IGF-I, IGFBP-3 and GHBP levels that were within the 95% confidence interval of the control values. We conclude that adults with acquired GH deficiency have elevated GHBP levels in comparison to healthy subjects. We suggest that measurement of GHBP levels might contribute to the diagnosis of adult GH deficiency, though further research is required to study the additional value of GHBP measurements.

UI MeSH Term Description Entries
D007334 Insulin-Like Growth Factor I A well-characterized basic peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like, and mitogenic activities. This growth factor has a major, but not absolute, dependence on GROWTH HORMONE. It is believed to be mainly active in adults in contrast to INSULIN-LIKE GROWTH FACTOR II, which is a major fetal growth factor. IGF-I,Somatomedin C,IGF-1,IGF-I-SmC,Insulin Like Growth Factor I,Insulin-Like Somatomedin Peptide I,Insulin Like Somatomedin Peptide I
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009994 Osmolar Concentration The concentration of osmotically active particles in solution expressed in terms of osmoles of solute per liter of solution. Osmolality is expressed in terms of osmoles of solute per kilogram of solvent. Ionic Strength,Osmolality,Osmolarity,Concentration, Osmolar,Concentrations, Osmolar,Ionic Strengths,Osmolalities,Osmolar Concentrations,Osmolarities,Strength, Ionic,Strengths, Ionic
D002352 Carrier Proteins Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes. Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D001667 Binding, Competitive The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements. Competitive Binding
D013006 Growth Hormone A polypeptide that is secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Growth hormone, also known as somatotropin, stimulates mitosis, cell differentiation and cell growth. Species-specific growth hormones have been synthesized. Growth Hormone, Recombinant,Pituitary Growth Hormone,Recombinant Growth Hormone,Somatotropin,Somatotropin, Recombinant,Growth Hormone, Pituitary,Growth Hormones Pituitary, Recombinant,Pituitary Growth Hormones, Recombinant,Recombinant Growth Hormones,Recombinant Pituitary Growth Hormones,Recombinant Somatotropins,Somatotropins, Recombinant,Growth Hormones, Recombinant,Recombinant Somatotropin

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