Our previous studies have indicated the presence of a macromolecular inhibitor of in vitro mineral growth, as well as a mineral nucleational agent in extracellular matrix fluid aspirated by micropuncture methods from epiphyseal hypertrophic cell cartilage. In this report, new miniaturized methods were used to extract proteinpolysaccharide complexes (PPC) from cartilage, to isolate a light fraction (PPL-C), and further, to separate it into R1, R2, and SR2 subfractions. These methods were applied to PPL-C complexes separated from microdissected epiphyseal cartilages and to cetylpyridinium chloride (CPC) precipitates of extracellular matrix fluid aspirated from similar cartilages. Most of all of the inhibitory action on an in vitro system of mineral growth shown by whole cartilage PPL-C and by cartilage fluid PPC obtained from noncalcifying sites was contained in the R2 fraction which represented ¼-[unk] of the total hexuronate.
Julio C. Pita, Leon A. Cuervo, Juan E. Madruga, Francisco J. Muller, David S. Howell
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