Product Description：Insulin-like growth factor binding protein-3 (IGFBP-3) is a 264-amino acid peptide (MW 29 kD) produced by the liver. It is the most abundant of a group of IGFBPs that transport, and control bioavailability and half-life of insulin-like growth factors (IGF), in particular IGF-1, the major mediator of the anabolic- and growth-promoting effects of growth hormone (GH). The protein forms a ternary complex with insulin-like growth factor acid-labile subunit (IGFALS) and either insulin-like growth factor (IGF) I or II, thus prolonging the half-life of IGFs and altering their interaction with cell surface receptors. 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.

IGFBP-3 also exhibits intrinsic growth-regulating effects that are not yet fully understood, but have evoked interest with regards to a possible role of IGFBP-3 as a prognostic tumor marker. Low IGFBP-3 and IGF-1 levels are observed in GH deficiency or GH resistance, also epidemiologic studies suggest that low IGFBP-3 is associated with greater risk of aggressive, metastatic prostate cancers. The elevated serum IGFBP-3 and IGF-1 levels indicate a sustained overproduction of GH, or excessive rhGH therapy. Both conditions are associated with generalized organomegaly, hypertension, diabetes, cardiomyopathy, osteoarthritis,  and diminished longevity.

The Ansh Labs Total IGFBP-3 Assay uses an acidification and neutralization method to dissociate IGFBP-3 from all the binding subunits. Total IGFBP-3 levels are quantified in the extracted samples using a highly sensitive and specific total IGFBP-3 ELISA. Similarly Intact IGFBP-3 levels can be measured using Intact IGFBP-3 ELISA (AL-149).

Regulatory Status：For Research Use Only. Not for use in diagnostic or therapeutic procedures.

Packaging：96 well microtiter

Detection：HRP-based ELISA, colorimetric detection by dual wavelength absorbance at 450 nm and 630 nm as reference filter

Dynamic Range：6, 7.5-216 ng/mL

Limit of Detection：0.3 ng/mL

Sample Type：Serum

Assay Time：1.5 hours

Species Reactivity：Human

Shelf Life：24 months