STING suppresses migration of murine triple-negative breast cancer cells E0771 and 4T1 in vitro

Triple-negative breast cancer (TNBC) is the most aggressive subtype of breast cancer and lacks effective therapies. The stimulator of interferon genes (STING) has been shown to both suppress and promote migration in various cancer types, but its role in TNBC remains unclear. To investigate this, we established STING-overexpressing murine TNBC cell lines and assessed their migratory and proliferative behavior. STING overexpression significantly suppressed cell migration without affecting cell proliferation. Furthermore, STING overexpression in E0771 cells upregulated expression levels of Itgb1 and Itga6 significantly, but not Icam1, Cxcl3, Itgb2, Lama5 , or Rhoa . These findings highlight the potential anti-migratory role of STING beyond immunomodulatory functions.