Figure 5From: Urokinase, a constitutive component of the inflamed synovial fluid, induces arthritisIn vitro cytokine production following stimulation with low molecular weight urokinase plasminogen activator for 48 hours. (a) IL-6 (n = 10), (b) tumour necrosis factor alpha (TNF-α) (n = 6), and (c) IL-1β (n = 4). Levels of cytokines are presented as the mean ± SEM (pg/ml). Significant difference in the groups is indicated; n.s., not significant.Back to article page