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Ultrastructural localization of the major proteoglycan and type II procollagen in organelles and extracellular matrix of cultured chondroblasts

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Summary

The mechanisms of synthesis and intracellular routing of the various cartilage matrix macromolecules are still unclear. We have studied this problem in cultured chondroblasts at the ultrastructural level using (i) monospecific antibodies against the core protein of the keratan sulfate/chondroitin sulfate-rich cartilage proteoglycan (KS:CS-PG) or Type II procollagen, and (ii) cuprolinic blue, a cationic dye that binds to the glycosaminoglycan chains of proteoglycans. Intracellularly, the proteoglycan antibodies localized KS:CS-PG and its precursors primarily in the Golgi complex and secretory vesicles. In contrast, the bulk of Type II procollagen was found within the rough endoplasmic reticulum (ER). While devoid of collagen, the extracellular matrix was rich in KS:CS-PG molecules some of which studded the chondroblast plasmalemma. Cuprolinic blue staining indicated that the proteoglycans present in the Golgi complex fell into a predominant class of large proteoglycans, probably representing KS:CS-PG, and a minor class of smaller proteoglycans. Groups of these divergent proteoglycans often occupied distinct Golgi subcompartments; moreover, single large proteoglycans appeared to align along the luminal surface of Golgi cisternae and secretory vesicles. These results suggest that in cultured chondroblasts KS:CS-PG and Type II procollagen are differentially distributed both in organelles and in the extracellular matrix, and that different proteoglycan types may occupy distinct subcompartments in trans Golgi.

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Authors and Affiliations

  1. Department of Pathology and Laboratory Medicine, School of Medicine, University of Pennsylvania, 3400 Spruce Street/G1, 19104, Philadelphia, Pennsylvania, USA

    R. V. Iozzo

  2. Department of Anatomy-Histology, School of Dental Medicine, University of Pennsylvania, 19104, Philadelphia, Pennsylvania, USA

    M. Pacifici

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  1. R. V. Iozzo
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  2. M. Pacifici
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Iozzo, R.V., Pacifici, M. Ultrastructural localization of the major proteoglycan and type II procollagen in organelles and extracellular matrix of cultured chondroblasts. Histochemistry 86, 113–122 (1986). https://doi.org/10.1007/BF00493375

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