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Abstract
Nonenzymatic, trypsin sensitive cytokines derived from lectin stimulated normal human mononuclear cells have been shown to induce release of proteoglycan and collagen degrading proteinase activity from chondrocytes in cartilage organ and isolated suspension culture systems. Active chondrocyte protein and RNA synthesis were required to induce activity. Cytokines responsible were of both monocyte and T cell origin. Direct monokine catabolic induction and monokine/lectin-triggered lymphokine inducing activity could be demonstrated. Cyclooxygenase inhibitors and direct or indirect modulation of mononuclear cell or chondrocyte cAMP levels had no effect on factor synthesis or activity. Hydrocortisone abrogated the effect. Cytokines responsible were heat labile, unaffected by reduction/alkylation or neuraminidase exposure, and stable over a pH range of 3-10.
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