Near-infrared induced phase-shifted ICG/Fe(3)O(4) loaded PLGA nanoparticles for photothermal tumor ablation.

Near-infrared induced phase-shifted ICG/Fe(3)O(4) loaded PLGA nanoparticles for photothermal tumor ablation.
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近红外诱导相移 ICG/Fe3O4 负载 PLGA 纳米颗粒用于光热肿瘤消融

DOI:
10.1038/s41598-017-06122-1
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发表时间:
2017-07-14
期刊:
影响因子:
4.6
通讯作者:
Peng Q
Peng Q
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Niu C;Xu Y;An S;Zhang M;Hu Y;Wang L;Peng Q

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近红外(NIR)激光诱导光热疗法(PTT)利用光热剂将光能转化为热能,作为一种有效的局部微创治疗手段具有巨大的潜力。为了提高PTT的疗效,我们开发了包裹超顺磁性氧化铁(Fe3O4)、吲哚青绿(ICG)和全氟戊烷(PFP)的聚丙交酯-乙交酯(PLGA)纳米粒子(NPs),作为近红外激光诱导PTT的协效剂。我们制备了一种新型的相移荧光磁性纳米粒子,Fe3O4/ICG@PLGA/PFP纳米粒子,它可以有效地响应近红外激光的照射产生热量,从而增强了热烧蚀效应和相移热弹性膨胀效应,因此可以用作光热剂。在用Fe3O4/ICG@PLGA/PFP纳米粒子和近红外激光照射体外处理MCF-7乳腺癌细胞后,组织学和电子显微镜证实了细胞的严重损伤,并在微泡的边缘或微泡外形成了许多含铁颗粒的微泡。在小鼠体内的MCF-7肿瘤实验表明,Fe3O4/ICG@PLGA/PFP纳米粒子可以在近红外激光照射下实现肿瘤消融,对未照射的组织毒性最小。综上所述,我们的结果表明,Fe3O4/ICG@PLGA/PFP纳米粒子可以作为有效的纳米消融剂用于肿瘤消融。
Near-infrared (NIR) laser-induced photothermal therapy (PTT) uses a photothermal agent to convert optical energy into thermal energy and has great potential as an effective local, minimally invasive treatment modality for killing cancer cells. To improve the efficacy of PTT, we developed poly(lactide-co-glycolide) (PLGA) nanoparticles (NPs) encapsulating superparamagnetic iron oxide (Fe3O4), indocyanine green (ICG), and perfluoropentane (PFP) as synergistic agents for NIR laser-induced PTT. We fabricated a novel type of phase-shifting fluorescent magnetic NPs, Fe3O4/ICG@PLGA/PFP NPs, that effectively produce heat in response to NIR laser irradiation for an enhanced thermal ablation effect and a phase-shift thermoelastic expansion effect, and thus, can be used as a photothermal agent. After in vitro treatment of MCF-7 breast cancer cells with Fe3O4/ICG@PLGA/PFP NPs and NIR laser irradiation, histology and electron microscopy confirmed severe damage to the cells and the formation of many microbubbles with iron particles at the edge or outside of the microbubbles. In vivo experiments in mice with MCF-7 tumors demonstrated that Fe3O4/ICG@PLGA/PFP NPs could achieve tumor ablation upon NIR laser irradiation with minimal toxicity to non-irradiated tissues. Together, our results indicate that Fe3O4/ICG@PLGA/PFP NPs can be used as effective nanotheranostic agents for tumor ablation.
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