Figure 2: Time-dependent release of IL-1β in THP-1-derived macrophages cells treated for 2, 4, and 6 h with summer Milan PM10 at a concentration of 2.5 μg/cm2. CTRL: untreated cells. Results are the mean and s.d. of at least three independent experiments and presented as pg/mL released in the culture medium. *** versus CTRL.