We studied the role of IL-6 and nitric oxide (NO) in IL-1 and leukaemia inhibitory factor (LIF) induced suppression of proteoglycan synthesis. Cartilage explants of patellae and femoral heads were incubated with IL-1 or LIF. Conditioned media were analysed for IL-6 activity (B9-assay) and NO content (Griess). Proteoglycan synthesis was assessed using [35S]sulfate incorporation. IL-1 dose depend...

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