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  • Title: Somatomedin-like peptide(s) isolated from fetal bovine cartilage (cartilage-derived factor): isolation and some properties.
    Author: Kato Y, Nomura Y, Tsuji M, Kinoshita M, Ohmae H, Suzuki F.
    Journal: Proc Natl Acad Sci U S A; 1981 Nov; 78(11):6831-5. PubMed ID: 6947256.
    Abstract:
    Fetal bovine cartilage contains a polypeptide(s) that has somatomedin-like effects on rat and rabbit costal chondrocytes in culture. This factor, named the cartilage-derived factor, was extracted from fetal bovine cartilage, fractionated with acetone, and purified by gel filtration on Toyopearl HW 55-F in 4 M guanidine hydrochloride, preparative isoelectric focusing, and subsequent gel filtration on Toyopearl HW 55-F in 1 M formic acid. The resulting preparation, which focused in the neutral pH region and eluted from a Toyopearl column in a fraction with apparent Mr 10,000--11,000, appeared homogenous by NaDodSO4 gel electrophoresis. The purified preparation markedly enhanced not only proteoglycan synthesis but also DNA synthesis in rabbit costal chondrocytes and, on a protein basis, it was 1000 times more active than insulin and 1,000,000 times more active than fetal calf serum in stimulating proteoglycan synthesis.
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