5′-CTT TTT CGC TGC ATC AGG TT-3′ (reverse); gp91phox, 5′-CAG GAG TTC CAA GAT GCC TG-3′ (forward) and 5′-GAT TGG CCT GAG ATT CAT CC-3′ (reverse); β-actin, 5′-GTA TGA CTC CAC TCA CGG CAA A-3′ (forward) and 5′-GGT CTC GCT CCT GGA AGA TG-3′ (reverse). The SYBR green PCR master mix (Applied Biosystems, Foster City, CA, USA) was used for real-time PCR analysis. The relative differences in expression between groups were expressed using cycle time (Ct) values normalized with β-actin, and relative differences between control and treatment group were calculated and expressed as relative increases setting control as 100%.