Integrating Epigenetic Modulators in Nanofibers for Synergistic Gastric Cancer Therapy via Epigenetic Reprogramming.

Epigenetic dysregulations resulting from the defects of epigenetic regulators are often reversible in tumorigenesis, making them promising cancer therapeutic targets. However, the limited specificity of action, short-term stability, and low retention of the epigenetic drugs greatly impede their clinical efficacy against solid tumors. Herein a method of combinatorial delivery of epigenetic modulatory drugs via a molecular self-assembly strategy was developed using inhibitors of DNA methyltransferases and histone deacetylases. The drug-drug conjugates can self-assemble into nanofibers with enhanced chemical stability. The nanofibers synergistically regulate aberrant DNA methylation and histone deacetylation, subsequently reprogram the gene expression profiles, and finally inhibit gastric cancer cell proliferation and promote cell apoptosis. The superior in vivo therapeutic efficacy of the nanofibers could be ascribed to the prolonged retention and accumulation in tumors and the minimized off-target effects. Therefore, this design of epigenetic-drug-based nanofiber formulation may provide a valuable paradigm for cancer therapy through epigenetic reprogramming.