Ali Es-haghi
Fatemeh Javadi
Mohammad Ehsan Taghavizadeh Yazdi
Mohammad Sadegh Amiri

Background: Drug resistance due to genetic variations renders many therapeutic methods such as surgery, radiotherapy, chemotherapy, and hormone therapy unsuccessful in eradicating cancerous cells. Nowadays, application of nanoparticles (NPs) has been promising in destroying cancerous cells without side effects on normal cells. Objectives: This study aimed to investigate the antioxidant and anticancer effects of biosynthesized cerium oxide nanoparticles (CeO۲ -NPs) on a hepatic carcinoma cell line. Methods: MTT assay was used to determine the cytotoxicity of CeO۲ -NPs in concentrations of ۰, ۱۵.۶, ۳۱.۲, ۶۲.۵, ۱۲۵, and ۲۵۰ μg/mL after ۲۴, ۴۸, and ۷۲ hours of incubation. Moreover, the expression levels of catalase (CAT) and superoxide dismutase (SOD) (the antioxidant genes) were investigated at different concentrations of CeO۲ -NPs using real-time polymerase chain reaction (PCR). Results: Our results showed a significant toxicity of the synthesized NPs against the cancerous liver cells. The IC۵۰ calculated for CeO۲ -NPs was ۵۰۰ μg/mL at ۲۴ hours of incubation. In addition, the expression levels of CAT and SOD significantly (P<۰.۰۵) increased upon the treatment of cells with CeO۲ -NPs (۵۰۰ µg /mL) compared to the untreated cells. Conclusion: Considering the minimal effects of the biosynthesized CeO۲ -NPs on normal cells and on the other hand their considerable toxicity against hepatic cancer cells, these NPs could be utilized in medicine and in the development of new drugs for cancer cells.