Interleukin 6 (IL-6) induced expression levels of inflammatory cytokines in the primary microglial cells. The microglia was incubated with or without IL-6 (Control) for 6 h. Vehicle (IL-6 + Vehicle), sodium sulfide (Na2S) at 50 μM (IL-6 + Na2S 50 μM), or 200 μM (IL-6 + Na2S 200 μM) was administered to the media 1 min after the addition of IL-6. CCL2, chemokine CC motif ligand 2; TNF-α, tumor necrosis factor α. N = 7–8 in each group. *P < 0.05, **P < 0.01, and ***P < 0.001. Data were analyzed using one-way ANOVA with a Bonferroni post hoc test.