[Thymosin β4 inhibits pyroptosis in BV2 microglial cells: a mechanistic study in vitro].

OBJECTIVES: To investigate the protective effects and molecular mechanisms of thymosin β4 (Tβ4) on pyroptosis in BV2 microglial cells. METHODS: sepsis-associated encephalopathy model was established by LPS and Nig co-treatment. Viability of BV2 cells was assessed by CCK-8 assay. RT-qPCR was performed to detect mRNA expression of interleukin (IL)-1β, interferon-induced protein with tetratricopeptide repeats 1 (IFIT1), and interferon-β (IFN-β). IL-1β levels in cell supernatants were measured by ELISA. Protein expression of NLRP3, GSDMD-N, cleaved caspase-1, phosphorylated stimulator of interferon genes (p-STING), and phosphorylated interferon regulatory factor 3 (p-IRF3) was analyzed by Western blot. Cell death rate and mitochondrial reactive oxygen species (ROS) levels were detected by flow cytometry using propidium iodide staining and MitoSOX indicator, respectively. RESULTS: 0.05). CONCLUSIONS: Tβ4 protects BV2 microglial cells against LPS and Nig-induced pyroptosis by inhibiting oxidative stress and inflammatory responses, potentially through regulation of the cGAS-STING signaling pathway.