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Articular Cartilage Glycosaminoglycans Inhibit the Adhesion of Endothelial Cells

Bara, Jennifer Jane, Johnson, William Eustace Basil, Caterson, Bruce ORCID: and Roberts, Sally 2012. Articular Cartilage Glycosaminoglycans Inhibit the Adhesion of Endothelial Cells. Connective Tissue Research 53 (3) , pp. 220-228. 10.3109/03008207.2011.629310

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Articular cartilage undergoes severe loss of proteoglycan and its constituent glycosaminoglycans (GAGs) in osteoarthritis. We hypothesize that the low GAG content of osteoarthritic cartilage renders the tissue susceptible to pathological vascularization. This was investigated using an in vitro angiogenesis model assessing endothelial cell adhesion to GAG-depleted cartilage explants. Bovine cartilage explants were treated with hyaluronidase to deplete GAG content and then seeded with fluorescently tagged human endothelial cells (HMEC-1). HMEC-1 adherence was assessed after 4 hr and 7 days. The effect of hyaluronidase treatment on GAG content, chondrocyte viability, and biochemical composition of the extracellular matrix was also determined. Hyaluronidase treatment reduced the GAG content of cartilage explants by 78 ± 3% compared with that of controls (p < 0.0001). GAG depletion was associated with significantly more HMEC-1 adherence on both the surface (superficial zone) and the underside (deep zone) of the explants (both p < 0.0001). The latter provided a more favorable environment for extended culture of HMEC-1 compared with the articulating surface. Hyaluronidase treatment altered the immunostaining for chondroitin sulfate epitopes, but not for lubricin. Our results support the hypothesis that articular cartilage GAGs are antiadhesive to endothelial cells and suggest that chondroitin sulfate and/or hyaluronan are responsible. The loss of these GAGs in osteoarthritis may allow osteochondral angiogenesis resulting in disease progression.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > Q Science (General)
Uncontrolled Keywords: angiogenesis, proteoglycan, glycosaminoglycan, endothelial cell, lubricin, osteoarthritis
Publisher: Informa Healthcare
ISSN: 0300-8207
Last Modified: 20 Oct 2022 09:35

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