| 摘要 |
The invention provides homogeneous compositions of a binding protein for insulin-like growth factors (IGFs) I and II, which binding protein inhibits the proliferative effects of IGF-I and IGF-II upon bone cells. The homogeneous protein of the invention is therefore known as inhibitory IGF binding protein, or In-IGF-BP. The invention also provides cloned nucleic acid sequences encoding In-IGF-BP, artificial expression systems for In-IGF-BP and host cells which produce useful quantities of In-IGF-BP. The invention further provides clinical diagnostic assays for IGFs, therapeutic treatments for IGF-responsive tumors, and means for modulating IGF activity upon bone cells.
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