Th2 cytokines suppress pro-caspase-1 without affecting levels of pro-IL-1β. (A) Taqman quantitative RT-PCR results showing mRNA expression of pro-IL-1β in THP-1s exposed to 100 μg/mL MWCNTs with IL-4, IL-13, or IL-4 and IL-13 co-treatment. B) Taqman qRT-PCR results showing mRNA levels of pro-caspase-1 in THP-1s exposed to MWCNTs with IL-4, IL-13, or IL-4 and IL-13 co-treatment. Statistical analysis was performed using a one-way ANOVA with a post hoc Tukey. ***P