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2014 ; 8
(10
): 9767-80
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Layer-by-layer assembled antisense DNA microsponge particles for efficient
delivery of cancer therapeutics
#MMPMID25198246
Roh YH
; Lee JB
; Shopsowitz KE
; Dreaden EC
; Morton SW
; Poon Z
; Hong J
; Yamin I
; Bonner DK
; Hammond PT
ACS Nano
2014[Oct]; 8
(10
): 9767-80
PMID25198246
show ga
Antisense oligonucleotides can be employed as a potential approach to effectively
treat cancer. However, the inherent instability and inefficient systemic delivery
methods for antisense therapeutics remain major challenges to their clinical
application. Here, we present a polymerized oligonucleotides (ODNs) that
self-assemble during their formation through an enzymatic elongation method
(rolling circle replication) to generate a composite nucleic acid/magnesium
pyrophosphate sponge-like microstructure, or DNA microsponge, yielding high
molecular weight nucleic acid product. In addition, this densely packed ODN
microsponge structure can be further condensed to generate polyelectrolyte
complexes with a favorable size for cellular uptake by displacing magnesium
pyrophosphate crystals from the microsponge structure. Additional layers are
applied to generate a blood-stable and multifunctional nanoparticle via the
layer-by-layer (LbL) assembly technique. By taking advantage of DNA
nanotechnology and LbL assembly, functionalized DNA nanostructures were utilized
to provide extremely high numbers of repeated ODN copies for efficient antisense
therapy. Moreover, we show that this formulation significantly improves nucleic
acid drug/carrier stability during in vivo biodistribution. These polymeric ODN
systems can be designed to serve as a potent means of delivering stable and large
quantities of ODN therapeutics systemically for cancer treatment to tumor cells
at significantly lower toxicity than traditional synthetic vectors, thus enabling
a therapeutic window suitable for clinical translation.