ZNF296 通过抑制免疫刺激基因驱动上皮癌免疫逃逸

UNLABELLED: Resistance to immune-mediated destruction is a fundamental hallmark of cancer. Although several mechanisms have been identified that facilitate immune evasion, the transcriptional programs that orchestrate this process remain poorly understood.

In this study, through a genome-wide CRISPR activation screen in human cancer cells subjected to NK cell-mediated killing, we identified ZNF296, a transcription factor highly expressed in epithelial cancers, as a key driver of tumor resistance to both NK and cytotoxic T-cell-mediated immunity. In mouse models, inhibition of ZNF296 significantly enhanced both NK and T-cell-mediated antitumor immunity, leading to a marked reduction in metastasis and increased infiltration of immune cells into the tumor microenvironment.

Mechanistically, ZNF296 induced strong transcriptional repression of IFN-stimulated genes and key immunostimulatory ligands critical for NK and T-cell-mediated cytotoxicity. At the molecular level, ZNF296 directly interacted with and recruited the NuRD chromatin remodeling and deacetylase complex to the promoters of its target genes to suppress expression.

Notably, treatment with low-dose romidepsin, an FDA-approved inhibitor targeting histone deacetylase 1, a core component of the NuRD complex, effectively restored NK and T-cell-mediated killing in cancer cells with high ZNF296 expression.

Collectively, these findings establish ZNF296 as a key regulator of immune evasion, driving resistance to both NK and T-cell-mediated antitumor immunity, and highlight its potential as a therapeutic target to overcome immune resistance in epithelial cancers. SIGNIFICANCE: ZNF296 is a transcriptional regulator that enables cancer cells to evade immune surveillance, offering possibilities for developing treatments that enhance the ability of the immune system to eliminate cancer cells.