Mechanisms of combined use of interferon-γ and ferroptosis inducers in the inhibition of the growth of oral tongue squamous cell carcinoma
Objective:To investigate the mechanism of interferon γ(IFN-γ)combined with ferroptosis inducer Erastin in the inhibi-tion of the growth of oral tongue squamous cell carcinoma(OTSCC).Methods:The expression of SLC7A11 in OTSCC was studied by bioinformatics analysis and immunohistochemical staining.SLC7A11 gene in OTSCC CAL-27 cells was knocked out by CRISPR-CAS9,and the survival rate of WT and SLC7A11 KO cells treated with Erastin was measured by MTT assay.Glutathione kit,lipid oxidation kit and flow cytometry were used to detect the changes of lipid peroxides in the cells treated with Erastin.After 24 h pretreatment with IFN-γ,MTT assay was used to detect the changes of cell sensitivity to Erastin,and the changes in lipid peroxides were detected by glu-tathione kits,lipid oxidation kits and flow cytometry.Results:Bioinformatics analysis and immunohistochemical staining showed that SLC7A11 was highly expressed in OTSCC.SLC7A11 KO CAL-27 cells were more sensitive to Erastin than WT cells.The GSH content of SLC7A11 KO cells was lower than that of WT cells,and the lipid peroxide content was higher than that of WT cells after treatment with Erastin.IFN-γ increased cell sensitivity to Erastin,decreased GSH content and increased lipid peroxides content in the cells.Conclusion:IFN-γ can reduce GSH and increase MDA and Lipid ROS levels by degrading SLC7A11,this increases the sensitivity of OTSCC to Erastin.
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