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We investigated the effect of interleukin (IL)-17 on Ly6G(+) cell apoptosis in zymosan-induced arthritis (ZIA) and oedema (ZIO). Zymosan injection at the ankle joint caused swelling and coincided with histological joint alterations and IL-17A expression in areas with cell infiltrates. Flow cytometry of blood demonstrated increased frequencies of Ly6G(+)CD11b(+) cells and their decreased apoptosis in ZIA. Annexin V(+) neutrophils had lower CD11b expression, unlike Annexin V(-) cells. Cell survival for 12 hours was affected neither by IL-17 nor by zymosan alone, while both stimuli diminished Annexin V(+) cell frequencies and up-regulated CD11b on Annexin V(-) cells. Interleukin 17 antagonised to the effects of zymosan in 24-hour cultures. The administration of IL-17 in ZIO increased paw thickness, enlarged the blood Ly6G(+) pool, elevated CD11b expression and decreased apoptosis. We suggest that altered neutrophil apoptosis in arthritis can be overcome by anti-IL-17 therapy combined with an inhibition of Toll-like receptor (TLR) 2 and CD11b signalling.

central-european journal of immunology/central european journal of immunology

Experimental immunology The effect of interleukin 17 and Toll-like receptor 2 on CD11b expression and apoptosis of neutrophils in zymosan-induced arthritis and paw oedema