The effects of histamine on CXCL10 production by asthmatic (A) and nonasthmatic (NA) ASM cells. Confluent serum-deprived ASM cells were stimulated with the individual cytokines (a) IL-1, (b) TNF, (c) IFN, or (d) cytomix for 24 h and CXCL10 released into the culture medium quantified using ELISA. compared with the cytokine control, ANOVA.