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Multifunctional nanoparticles for intracellular drug delivery and photoacoustic imaging of mesenchymal stem cells

机译:用于细胞内药物输送和间充质干细胞的光声成像的多功能纳米颗粒

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Strategies that control the differentiation of mesenchymal stem cells (MSC) and enable image-guided cell implantation and longitudinal monitoring could advance MSC-based therapies for bone defects and injuries. Here we demonstrate a multifunctional nanoparticle system that delivers resveratrol (RESV) intracellularly to improve osteogenesis and enables photoacoustic imaging of MSCs. RESV-loaded nanoparticles (RESV-NPs), formulated from poly (lactic-co-glycolic) acid and iron oxide, enhanced the stability of RESV by 18-fold and served as photoacoustic tomography (PAT) contrast for MSCs. Pre-loading MSCs with RESV-NP upregulated RUNX2 expression with a resultant increase in mineralization by 27% and 45% compared to supplementation with RESV-NP and free RESV, respectively, in 2-dimensional cultures. When grown in polyethylene glycol-based hydrogels, MSCs pre-loaded with RESV-NPs increased the overall level and homogeneity of mineralization compared to those supplemented with free RESV or RESV-NP. The PAT detected RESV-NP-loaded MSCs with a resolution of 1500 cells/L, which ensured imaging of MSCs upon encapsulation in a PEG-based hydrogel and implantation within the rodent cranium. Significantly, RESV-NP-loaded MSCs in hydrogels did not show PAT signal dilution over time or a reduction in signal upon osteogenic differentiation. This multifunctional NP platform has the potential to advance translation of stem cell-based therapies, by improving stem cell function and consistency via intracellular drug delivery, and enabling the use of a promising emerging technology to monitor cells in a clinically relevant manner.
机译:控制间充质干细胞(MSC)分化并使图像引导细胞植入和纵向监测的策略可以提高基于MSC的骨缺损和损伤的疗法。在这里,我们证明了一种多功能纳米粒子系统,可容纳白藜芦醇(RESV),以改善骨肉发生,并实现MSC的光声成像。由聚(乳酸二乙醇酸)酸和氧化铁配制的Resv负载纳米颗粒(ResV-NPS)增强了REVV的稳定性18倍,用作MSCs的光声断层扫描(PAT)对比度。预加载MSCs具有Resv-NP上调的Runx2表达,与分别在二维培养物中分别在二维培养物中的补充剂相比,矿化的矿化增加27%和45%。当在基于聚乙二醇的水凝胶中生长时,与RESV-NPS预装载的MSCs与补充有免费RESV或RESV-NP的那些增加了矿化的总水平和均匀性。 PAT检测Resv-NP加载的MSC,分辨率为1500个细胞/ L,其在啮合在啮齿动物颅骨内的植入物中封装时确保了MSC的成像。值得注意的是,水凝胶中的Resv-NP负载MSCs未在时间内显示PAT信号稀释或在成骨分化时的信号降低。该多功能NP平台具有通过细胞内药物递送改善干细胞功能和一致性的基于干细胞的疗法来推进干细胞疗法的可能性,并使有前途的新兴技术能够以临床相关的方式监测细胞。

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