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Self-Assembling DNA Dendrimer for Effective Delivery of Immunostimulatory CpG DNA to Immune Cells

2015; American Chemical Society; Volume: 16; Issue: 4 Linguagem: Inglês

10.1021/bm501731f

1526-4602

Kohta Mohri, Eri Kusuki, Shozo Ohtsuki, Natsuki Takahashi, Masayuki Endo, Kumi Hidaka, Hiroshi Sugiyama, Yuki Takahashi, Yoshinobu Takakura, Makiya Nishikawa,

Advanced biosensing and bioanalysis techniques

DNA dendrimers consisting of several branched DNA units connected to each other using DNA ligase were quite effective for the delivery of immunostimulatory CpG DNA to immune cells. Therapeutic application of such DNA dendrimers, however, is hampered by the use of the ligase. Here, we report that self-assembling DNA dendrimers with high immunostimulatory potency can be prepared without DNA ligases. Annealing of DNA consisting of DNA units with elongated adhesive ends resulted in the formation of DNA dendrimers. Atomic force microscopy revealed that the several preparations of DNA dendrimers resulted in dendritic structures as designed. The cellular uptake of DNA dendrimers by mouse macrophage-like RAW264.7 cells and subsequent release of tumor necrosis factor-α were dependent on the structural complexity of the dendrimers. These results indicate that the ligation-free, self-assembling DNA dendrimers are a potent system for the delivery of immunostimulatory CpG DNA to immune cells.