Effect of adenosine kinase inhibitor IT on 2-CADO-induced apoptosis. RA – FLSs were preincubated for 3 h, with or without 10 μM IT. After washing, the cells were incubated with 2-CADO for an additional 24 h, after which DNA fragmentation was assayed. Representative results from three independent experiments are shown. The data are normalized to the value obtained in the absence of 2-CADO, which was arbitrarily assigned a value of 1.0; #, P<0.05 vs control incubation.