Figure 4.

Effect of IL-1β (1 ng ml⁻¹) on (a) salbutamol (1 μM)- and (b) forskolin (10 μM)-stimulated increases in intracellular cyclic AMP levels in human airway smooth muscle cells. Data represent mean±s.e.mean of duplicate values from independent experiments using cells cultured from four different donors, cell passages 3 – 4. ^*P<0.05 compared to salbutamol alone at similar time points by Bonferroni's t-test. §P<0.05, §§P<0.01 compared to unstimulated levels at similar time points by Bonferroni's t-test.