Fig. 7. interleukin 6 (IL-6, A), tumor necrosis factor α (TNFα, B), catalase (C) and total nitric oxide (NO, D) levels in lung homogenates of Wistar rats intratracheally instilled with either saline (control) or cerium oxide nanoparticles (CeO₂ NPs) with or without cisplatin (CP) administration. Data are mean ± SEM. IL-6: saline (n=6), CeO₂ NPs (n=6), CP+saline (n=6) and CP+ CeO₂ NPs (n=6). TNFα: saline (n=7), CeO₂ NPs (n=7), CP+saline (n=6) and CP+ CeO₂ NPs (n=6). Catalase: saline (n=6), CeO₂ NPs (n=5), CP+saline (n=5) and CP+ CeO₂ NPs (n=5). NO: saline (n=8), CeO₂ NPs (n=8), CP+saline (n=8) and CP+ CeO₂ NPs (n=8).