上转换纳米粒子结合DNA链式扩增技术在阿霉素光控释放中的应用

纳米技术的发展使得纳米材料可以通过不同的表面包覆和修饰而在生物医药中发挥应用。 构建简单、经济、药物释放可控的生物相容性纳米药物仍是纳米生物化学领域的重点。 我们构建的纳米载药体系(DDS)以NaYF₄：Yb/Tm上转换纳米粒子为载体,在其表面通过光致断键型小分子4,5-二甲氧基-2-硝基苯基乙酮(DMNPE)连接一段短单链DNA,利用DNA链式扩增技术(HCR)来调节纳米粒子最终修饰的双链DNA的总量,从而控制对抗癌药物阿霉素(Dox)的担载量,在980 nm激光照射下上转换纳米粒子发射可切断DMNPE连接的近紫外光,协同胞内DNA酶的作用达到对药物的可控释放。 由于近红外光照对生物组织具有较好的穿透能力,此体系能够对病灶位置有更好的光靶向性从而减少药物的毒副作用。

Upconversion Nanoparticles Decorated with Hybridization Chain Reaction DNA for Near-infrared Light Controlled Release Doxorubicin

Nanotechnology has allowed various coatings and modifications to nanostructures for applications of biomedicine. The constructions of simple, economical, controllable and biocompatible drug delivery systems(DDS) are still in demand. Here, we report a NaYF₄：Yb/Tm nanoparticle-based DDS that anticancer drug doxorubicin(Dox) could be quantitatively carried by double stranded DNA thereon that self-assembled through a hybridization chain reaction(HCR). The HCR DNA was absorbed on the surface of upconversion nanoparticles(UCNPs) through linkage to photocleavable 1-(4,5-dimethoxy-2-nitrophenyl) diazoethane(DMNPE) molecules, which can be cleaved by near ultraviolet light emitted by UCNPs under 980 nm laser light excitation. The controllable release of model drug Dox by near-infrared(NIR) should facilitate selective cytotoxicity to target region and reduced side effects and could prove promising in biomedical applications.