Complementary DNA structure of the high molecular weight rat insulin-like growth factor binding protein (IGF-BP3) and tissue distribution of its mRNA.

Biochemical and Biophysical Research Communications
S ShimasakiN Ling

Abstract

Insulin-like growth factors (IGFs) found in extracellular fluids are bound to specific binding proteins. Recently a high molecular weight IGF-binding protein (IGF-BP3) has been isolated from porcine ovarian follicular fluid based on its inhibition of follicle stimulating hormone-stimulated estradiol production in rat granulosa cells. The complete primary structure of the porcine IGF-BP3 was deduced by molecular cloning. Using the porcine cDNA as a probe, we have now isolated and characterized cDNAs encoding rat IGF-BP3 from a pregnant mare serum gonadotropin-stimulated ovarian library. The predicted amino acid sequence revealed a mature polypeptide consisting of 265 amino acids with 18 cysteines and 4 potential Asn-linked glycosylation sites. Northern analysis of the IGF-BP3 mRNA in rat tissues showed a single 2.6 kb band in liver, kidney, stomach, heart, adrenal, ovary, testis, spleen, lung, small and large intestine in varying amounts, but the message is below the limit of detection in hypothalamus and brain cortex.

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