Effect of MWCNTs and/or quercetin on splenic inflammatory cytokines (TNFα, IL1β, IL6) as detected by Elisa (concentration) and qPCR (gene expression). Data represent three independent experiments and were presented as mean ± SEM (n = 5/group). Means within columns carrying different letters are significantly different at p ≤ 0.05. All groups were compared to each other. Cnt, control group; Que, quercetin-treated group; MWC-L, MWCNTs low dose-treated group; MWC-H, MWCNTs high dose-treated group; MWC-L+Que, MWCNTs low-dose and quercetin co-treated group; MWC-H+Que, MWCNTs high-dose and quercetin co-treated group.