Anti-Inflammatory and Antioxidant Properties of Squalene in Copper Sulfate-Induced Inflammation in Zebrafish ( Danio rerio )

Long-term or excessive oxidative stress can cause serious damage to fish. Squalene can be added to feed as an antioxidant to improve the body constitution of fish. In this study, the antioxidant activity was detected by 2,2-diphenyl-1-acrylhydrazyl (DPPH) test and fluorescent probe (dichloro-dihydro-fluorescein diacetate). Transgenic ( : ) zebrafish were used to evaluate the effect of squalene on CuSO -induced inflammatory response. Quantitative real-time reverse transcription polymerase chain reaction was used to examine the expression of immune-related genes. The DPPH assay demonstrated that the highest free radical scavenging exerted by squalene was 32%. The fluorescence intensity of reactive oxygen species (ROS) decreased significantly after 0.7% or 1% squalene treatment, and squalene could exert an antioxidative effect in vivo. The number of migratory neutrophils in vivo was significantly reduced after treatment with different doses of squalene. Moreover, compared with CuSO treatment alone, treatment with 1% squalene upregulated the expression of by 2.5-foldand by 1.3-fold to protect zebrafish larvae against CuSO -induced oxidative damage. Moreover, treatment with 1% squalene significantly downregulated the expression of and . This study showed that squalene has potential as an aquafeed additive to provide both anti-inflammatory and antioxidative properties.