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- W2048596522 abstract "abstract The insulin-like growth factor (IGF)-binding proteins (IGFBPs) carry IGFs in serum and regulate their activity and bioavailability. The main IGFBP in serum, IGFBP-3, is known to form a 150-kDa complex with IGFs and the acid-labile subunit (ALS). We investigated the binding of IGFBP-3 to additional association proteins in human serum (IGFBP-3 APs). Ligand blots, column chromatography, and affinity cross-linking experiments revealed the specific binding of IGFBP-3 to at least three novel serum proteins. These techniques demonstrated the presence of proteins with molecular masses of 70, 100, and 150 kDa that bind IGFBP-3 with high affinity. Serum ALS migrated separately (at 88 kDa) from the novel IGFBP-3 APs (as evident by Western immunoblot), and bound IGFBP-3 weakly (by reverse ligand blots). We also demonstrated that large amounts of one of the IGFBP-3 APs and small amounts of ALS were coimmunoprecipitated with IGFBP-3 from human serum. Similar to ALS, these IGFBP-3 APs are acid labile and lose their IGFBP-3 binding capacity after exposure to low pH. We conclude that there are several serum proteins in addition to ALS and IGFs that bind IGFBP-3 with high affinity. These IGFBP-3 APs may serve as an additional reservoir of IGFBP-3 or modulate its functions." @default.
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- W2048596522 date "1998-08-01" @default.
- W2048596522 modified "2023-10-14" @default.
- W2048596522 title "Identification of Novel High Molecular Weight Insulin-Like Growth Factor-Binding Protein-3 Association Proteins in Human Serum1" @default.
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- W2048596522 doi "https://doi.org/10.1210/jcem.83.8.5053" @default.
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