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IGFBP-3 Functional Human ELISA

  • Regulatory status:RUO
  • Type:Sandwich ELISA, Biotin-labelled antibody
  • Other names:Insulin-Like Growth Factor Binding Protein-3
  • Species:Human
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RMEE04R 96 wells (1 kit)
PubMed Product Details
Technical Data

Type

Sandwich ELISA, Biotin-labelled antibody

Applications

Serum, Plasma-EDTA, Plasma-Heparin

Sample Requirements

10 µl/well

Storage/Expiration

Store the complete kit at 2–8°C. Under these conditions, the kit is stable until the expiration date (see label on the box).

Calibration Curve

Calibration Range

0.4–30 ng/ml

Limit of Detection

0.18 ng/ml

Summary

Research topic

Growth hormone and factor-related products

Summary

Insulin-like growth factors (IGF)-1 and -2 are bound to specific binding proteins (IGFBPs) in the circulation. To date, at least six binding proteins can be distinguished on the basis of their amino acid sequence. They are designated as IGFBP-1, IGFBP-2, IGPBP-6. Lately the discovery of a new IGFBP-7 has been discussed. The predominating IGFBP in blood is IGFBP-3. In contrast to the other binding proteins, IGFBP-3 has the unique property to associate with an acid-labile non-binding subunit (ALS) after binding of either IGF-I or IGF-II. Most of the IGFBP-3 in plasma is present as the high molecular weight ternary complex, however, small amounts of free IGFBP-3 are also found.

The development of specific immunoassays for IGFBP-3, those also recognizing the complete high molecular weight complex, provided new in-sights into its regulation (6-9). On the basis of these findings total serum IGFBP-3 has proved to be an additional useful test in the repertoire of diagnostic tools for evaluation of growth disorders. Patients with GH deficiency have subnormal total IGFBP-3 levels. In contrast, most of the small statured children with normal GH secretion have levels within the normal range.
The separation of these two groups is easy. A single measurement of the total IGFBP-3 concentration is sufficient for the diagnosis of GH deficiency with high accuracy. In small statured children total IGFBP-3 levels rise to normal range within several days of GH administration and remain normal during continuous GH treatment. Therefore, total serum IGFBP-3 measurements are also suited for evaluating the potential of a patient to respond to GH and for GH therapy monitoring. In other patients of severe short stature, e.g. Ullrich-Turner syndrome or Silver-Russell syndrome, IGFBP-3 levels were found normal reflecting normal GH secretion. In normal tall children and adolescents without excessive GH secretion or in patients with Sotos syndrome, total IGFBP-3 levels are normal or slightly increased. In contrast, children with pituitary gigantism or adults with acromegaly have clearly elevated levels that normalize on successful treatment. Therefore, total IGFBP-3 is also a useful parameter for the detection of excessive GH secretion and monitoring therapy efficacy. In precocious puberty, total IGFBP-3 levels are clearly increased by chronological age, whereas patients with premature thelarche have total IGFBP-3 levels in the upper normal range. Several factors besides GH influence total IGFBP-3 levels: age including sexual development, nutrition, hypothyroidism, diabetes mellitus, liver function and kidney function. Total IGFBP-3 levels are decreased by malnutrition, although less than IGF-I, in hypothyroidism, in diabetes mellitus and in hepatic failure, but are obviously increased in chronic renal failure. Measurement over 24 hours revealed constant circadian levels. For clinical practice, the most important regulatory factor is GH. Single total IGFBP-3 measurements correlate significantly with the logarithm of the integrated spontaneous GH secretion. In patients with GH deficiency, total IGFBP-3 levels are subnormal and increase gradually to within the normal range after several days of GH administration. The slow response to GH and constant circadian levels during chronic daily application of GH suggest that IGFBP-3 reflects the GH secretory state over days.

References to Summary

References to IGFBP-3

  • Ballard J, Baxter R, Binoux M, Clemmons D, Drop S, Hall K, Hintz R, Rechler M, Rutanen E, Schwander J. On the nomenclature of the IGF binding proteins. Acta Endocrinol (Copenh). 1989 Nov;121 (5):751-2
  • Baxter RC. Characterization of the acid-labile subunit of the growth hormone-dependent insulin-like growth factor binding protein complex. J Clin Endocrinol Metab. 1988 Aug;67 (2):265-72
  • Baxter RC, Martin JL. Radioimmunoassay of growth hormone-dependent insulinlike growth factor binding protein in human plasma. J Clin Invest. 1986 Dec;78 (6):1504-12
  • Baxter RC, Martin JL. Structure of the Mr 140,000 growth hormone-dependent insulin-like growth factor binding protein complex: determination by reconstitution and affinity-labeling. Proc Natl Acad Sci U S A. 1989 Sep;86 (18):6898-902
  • Blum WF, Ranke MB. Use of insulin-like growth factor-binding protein 3 for the evaluation of growth disorders. Horm Res. 1990;33 Suppl 4:31-7
  • Blum WF, Ranke MB, Kietzmann K, Gauggel E, Zeisel HJ, Bierich JR. A specific radioimmunoassay for the growth hormone (GH)-dependent somatomedin-binding protein: its use for diagnosis of GH deficiency. J Clin Endocrinol Metab. 1990 May;70 (5):1292-8
  • Firth SM, Baxter RC. Cellular actions of the insulin-like growth factor binding proteins. Endocr Rev. 2002 Dec;23 (6):824-54
  • Holman SR, Baxter RC. Insulin-like growth factor binding protein-3: factors affecting binary and ternary complex formation. Growth Regul. 1996 Mar;6 (1):42-7
  • Lee PD, Hintz RL, Sperry JB, Baxter RC, Powell DR. IGF binding proteins in growth-retarded children with chronic renal failure. Pediatr Res. 1989 Oct;26 (4):308-15
  • Schneider MR, Lahm H, Wu M, Hoeflich A, Wolf E. Transgenic mouse models for studying the functions of insulin-like growth factor-binding proteins. FASEB J. 2000 Apr;14 (5):629-40
  • Silha JV, Murphy LJ. Insulin-like growth factor binding proteins in development. Adv Exp Med Biol. 2005;567:55-89
  • Silha JV, Murphy LJ. Insights from insulin-like growth factor binding protein transgenic mice. Endocrinology. 2002 Oct;143 (10):3711-4
  • Wilson EM, Oh Y, Rosenfeld RG. Generation and characterization of an IGFBP-7 antibody: identification of 31kD IGFBP-7 in human biological fluids and Hs578T human breast cancer conditioned media. J Clin Endocrinol Metab. 1997 Apr;82 (4):1301-3
  • Yakar S, Sun H, Zhao H, Pennisi P, Toyoshima Y, Setser J, Stannard B, Scavo L, Leroith D. Metabolic effects of IGF-I deficiency: lessons from mouse models. Pediatr Endocrinol Rev. 2005 Sep;3 (1):11-9
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