首页> 美国卫生研究院文献>ACS AuthorChoice >Synthesis Characterization and Application of Core–ShellCo0.16Fe2.84O4@NaYF4(YbEr) and Fe3O4@NaYF4(Yb Tm) Nanoparticleas Trimodal (MRI PET/SPECT and Optical) Imaging Agents
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Synthesis Characterization and Application of Core–ShellCo0.16Fe2.84O4@NaYF4(YbEr) and Fe3O4@NaYF4(Yb Tm) Nanoparticleas Trimodal (MRI PET/SPECT and Optical) Imaging Agents

机译:核壳的合成表征及应用Co0.16Fe2.84O4@NaYF4(YbEr)和Fe3O4 @ NaYF4(YbTm)纳米粒子作为三峰(MRIPET / SPECT和光学)成像剂

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摘要

Multimodal nanoparticulate materials are described, offering magnetic, radionuclide, and fluorescent imaging capabilities to exploit the complementary advantages of magnetic resonance imaging (MRI), positron emission tomography/single-photon emission commuted tomography (PET/SPECT), and optical imaging. They comprise Fe3O4@NaYF4 core/shell nanoparticles (NPs) with different cation dopants in the shell or core, including Co0.16Fe2.84O4@NaYF4(Yb, Er) and Fe3O4@NaYF4(Yb, Tm). These NPs are stabilized by bisphosphonate polyethylene glycol conjugates (BP-PEG), and then show a high transverse relaxivity (r2) up to 326 mM–1 s–1 at 3T, a high affinity to [18F]-fluoride or radiometal-bisphosphonate conjugates (e.g., 64Cu and 99mTc), and fluorescent emissions from 500 to 800 nm under excitation at 980 nm. The biodistribution of intravenously administered particles determined by PET/MR imaging suggests that negatively charged Co0.16Fe2.84O4@NaYF4(Yb, Er)-BP-PEG (10K) NPs cleared from the blood pool more slowly than positively charged NPs Fe3O4@NaYF4(Yb, Tm)-BP-PEG (2K). Preliminary results in sentinel lymph node imaging in mice indicate the advantages of multimodal imaging.
机译:描述了多峰纳米颗粒材料,它们提供磁性,放射性核素和荧光成像功能,以利用磁共振成像(MRI),正电子发射断层扫描/单光子发射换向断层扫描(PET / SPECT)和光学成像的互补优势。它们包含Fe3O4 @ NaYF4核/壳纳米粒子(NP),在壳或核中具有不同的阳离子掺杂剂,包括Co0.16Fe2.84O4@NaYF4(Yb,Er)和Fe3O4 @ NaYF4(Yb,Tm)。这些NP被双膦酸酯聚乙二醇共轭物(BP-PEG)稳定,然后在3T时表现出高达326 mM -1 s -1 的高横向弛豫性(r2) ,对[ 18 F]-氟化物或放射性金属-双膦酸酯共轭物(例如, 64 Cu和 99m Tc)具有高亲和力,并发出荧光在980 nm激发下从500至800 nm。通过PET / MR成像确定的静脉内给药颗粒的生物分布表明,带负电的Co0.16Fe2.84O4@NaYF4(Yb,Er)-BP-PEG(10K)NPs从血池中清除的速度比带正电的NPs Fe3O 4 @NaYF 4 (Yb,Tm)-BP-PEG(2K)。小鼠前哨淋巴结成像的初步结果表明多模式成像的优势。

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