The superficial layer of human articular cartilage is more susceptible to interleukin-1-induced damage than the deeper layers

Arthritis and Rheumatism
H J HauselmannM B Aydelotte

Abstract

To compare the responses of chondrocytes from superficial and deep layers of normal human articular cartilage to interleukin-1 (IL-1) and IL-1 receptor antagonist protein (IRAP), and to evaluate the binding sites for IL-1 on these cells. Cartilage and chondrocytes from superficial and deeper layers of human femoral condyles were cultured with and without IL-1 in the presence and absence of IRAP. The effect of these agents on 35S- proteoglycan synthesis and catabolism and production of stromelysin and tissue inhibitor of metalloproteinases 1 (TIMP-1) were measured by biochemical and immunologic assays. Receptor binding was evaluated using 125I-labeled IL-1. IL-1 induced more severe inhibition of proteoglycan synthesis and a lower ratio of secreted TIMP-l:stromelysin in chondrocytes from superficial cartilage than those from deeper cartilage. IRAP blocked responses to IL-1 more effectively in chondrocytes from deep cartilage than those from superficial cartilage. Chondrocytes from the articular surface showed approximately twice the number of high-affinity b!nding sites for IL-1 as did cells from deep cartilage. Chondrocytes from the surface of articular cartilage show a greater vulnerability to the harmful effects of IL-1 and ar...Continue Reading

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