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Rat serum contains two major forms of insulin-like growth factor (IGF) binding proteins (BPs) that have apparent mol wts of about 35,000 and 150,000. We have isolated a cDNA clone encoding an IGF-BP whose N-terminal sequence is completely homologous to the NH2-terminal of the Buffalo rat liver cells-3A BP. The 270 amino acid mature protein has a predicted mol wt of 29,500. It contains a cysteine rich domain at each end of the molecule and an Arg-Gly-Asp (RGD) tripeptide motif near its C-terminus which suggests that this BP might associate with integrin cell surface receptors. The mature protein shares only partial homology with two published human IGF-BPs. Northern blot analysis shows that its mRNA is abundant in several fetal tissues, in adult brain, testes, ovaries, and kidney. Expression in the liver is high in fetal life but decreases to a barely detectable level in adulthood. However, upon hypophysectomy, the mRNA level increases at least 20-fold which suggests a hormonal regulation for the hepatic production of this small IGF-BP.

A Low Molecular Weight Insulin-Like Growth Factor Binding Protein from Rat: cDNA Cloning and Tissue Distribution of its Messenger RNA