Abstract
DNA origami is designed by folding DNA strands at the nanoscale with arbitrary control. Due to its inherent biological nature, DNA origami is used in drug delivery for enhancement of synergism and multidrug resistance inhibition, cancer diagnosis, and many other biomedical applications, where it shows great potential. However, the inherent instability and low payload capacity of DNA origami restrict its biomedical applications. Here, this paper reports the fabrication of an advanced biocompatible nano-in-nanocomposite, which protects DNA origami from degradation and facilities drug loading. The DNA origami, gold nanorods, and molecular targeted drugs are co-incorporated into pH responsive calcium phosphate [Ca3(PO4)2] nanoparticles. Subsequently, a thin layer of phospholipid is coated onto the Ca3(PO4)2 nanoparticle to offer better biocompatibility. The fabricated nanocomposite shows high drug loading capacity, good biocompatibility, and a photothermal and pH-responsive payload release profile and it fully protects DNA origami from degradation. The codelivery of DNA origami with cancer drugs synergistically induces cancer cell apoptosis, reduces the multidrug resistance, and enhances the targeted killing efficiency toward human epidermal growth factor receptor 2 positive cells. This nanocomposite is foreseen to open new horizons for a variety of clinical and biomedical applications.
A biocompatible photothermal and pH dual responsive nano-in-nanocomposite is developed to both protect DNA origami from degradation and facilitate loading of therapeutics. The DNA origami, gold nanorods, and anticancer drugs are co-incorporated into calcium phosphate nanoparticles coated with a thin layer of phospholipid. The nanocomposites synergistically induce cancer cell apoptosis and reduce the multidrug resistance for potential clinical and biomedical applications.
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