AI Article Synopsis
- The study identifies Del1 as a key protein component found in the cell-associated matrix of freshly isolated chondrocytes from the superficial zone of adult bovine articular cartilage.
- Very little Del1 was detected in chondrocytes from the deeper zones, indicating a specific association with the superficial layer.
- Immunohistochemical staining and Western blot analysis confirmed that Del1 is more abundant in the superficial zone compared to deeper layers, marking its significance in this nonendothelial, nonfetal tissue.
Article Abstract
Articular cartilage contains four distinct zones, extending from the surface to the subchondral bone. Freshly isolated chondrocytes from the superficial zone of articular cartilage retain a collagenase-P-resistant cell-associated matrix. In the studies described here, the protein Del1 was identified as a component of the cell-associated matrix of superficial zone chondrocytes from adult bovine articular cartilage. Very little Del1 was associated with freshly isolated deep zone chondrocytes. Western blot analysis of articular cartilage cell and tissue extracts using polyclonal antibodies specific for Del1 showed Del1 was present in an insoluble cell-associated fraction. Extracts of the superficial zone of articular cartilage were found to be enriched in Del1 compared to the deeper layers of the tissue. Immunohistochemical staining of full-thickness articular cartilage with anti-Del1 antibodies also showed an enrichment of Del1 in the superficial zone. These observations are the first to describe the protein Del1 in a nonendothelial, nonfetal tissue.
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| http://dx.doi.org/10.1006/bbrc.2001.5377 | DOI Listing |
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