Fig. 4. Protein levels of IL-4 and IL-13 determined using an enzyme-linked immunosorbent assay. (A) Cells were pretreated with Poly I:C, IL-1α, and (B) IL-4 for 24 hours and subsequently incubated with particulate matter (PM) for 24 hours; samples were normalized to standard curves. Values are presented as mean±standard deviation (n=3). Poly I:C: polyinosinic:polycytidylic acid, IL: interleukin.
