ZMYND8 expression in breast cancer cells blocks T-lymphocyte surveillance to promote tumor growth

Alexandros G.Sfakianakis shared this article with you from Inoreader ZMYND8 expression in breast cancer cells blocks T-lymphocyte surveillance to promote tumor growth Μέσω Cancer Research Online First Articles Emerging studies indicate that DNA damage in cancer cells triggers antitumor immunity, but its intrinsic regulatory mechanism in breast cancer cells remains poorly understood. Here, we show that ZMYND8 is upregulated and inhibits micronucleus formation and DNA damage in breast cancer cells. Loss of ZMYND8 triggered activation of the DNA sensor cyclic guanosine monophosphate-adenosine monophosphate synthase in micronuclei, leading to further activation of the downstream signaling effectors stimulator of interferon genes and NF-kappaB, but not TANK-binding kinase 1 and interferon regulatory factor 3, thereby inducing the expression of interferon-beta and interferon-stimulated genes (ISGs) in breast cancer cells in vitro and tumors in vivo. ZMYND8 knockout (KO) in breast cancer cells promoted infiltration of CD4+ and CD8+ T cells leading to tumor inhibition in syngeneic mouse models, which was significantly attenuated by treatment of anti-CD4/CD8 depleting antibodies or anti-IFNAR 1 antibody and in immunodeficient Rag1 KO mice. In human breast tumors, ZMYND8 was negatively correlated with ISGs, CD4, CD8A, CD8B, and the tumor-lymphocyte infiltration phenotype. Collectively, these findings demonstrate that maintenance of genome stability by ZMYND8 causes breast cancer cells to evade cytotoxic T-lymphocyte surveillance which leads to tumor growth. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.