Summary
Fresh frozen tissue sections of human articular cartilage was treated without and with human testicular hyaluronidase (2×106 units/l) for 60 min at 37° C and stained by the indirect immunoperoxidase technique with rabbit antihuman fibronectin. The rabbit antihuman fibronectin was purified by affinity chromatography on human fibronectin-Sepharose. Fibronectin was only found on the acellular surface of the articular cartilage in tissue sections not treated with hyaluronidase. In this surface layer, probably identical to “lamina splendens”, the arrangement of fibronectin was as a membrane. No collagen was seen in this area by van Gieson staining. No staining for fibronectin was found in the cartilage matrix or in the chondrocytes. Treatment of the cartilage tissue with hyaluronidase resulted in visualization of high amount of fibronectin in the cartilage matrix, with the highest intensity around the chondrocytes. The staining of the acellular surface layer of the articular cartilage was identical with the results obtained without hyaluronidase treatment. These results indicate that articular cartilage is rich in fibronectin probably in complex with hyaluronic acid, and that the chondrocytes produce fibronectin in situ. It also demonstrates the steric hindrance of hyaluronic acid aggregates in diffusion of the antibody and the value of hyaluronidase treatment of tissue before demonstration of fibronectin.
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Clemmensen, I., Hølund, B., Johansen, N. et al. Demonstration of fibronectin in human articular cartilage by an indirect immunoperoxidase technique. Histochemistry 76, 51–56 (1982). https://doi.org/10.1007/BF00493284
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DOI: https://doi.org/10.1007/BF00493284