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天然和基因工程仿生大分子制备的多层胶囊的细胞摄取。

Cellular uptake of multilayered capsules produced with natural and genetically engineered biomimetic macromolecules.

机构信息

3B's Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence of Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806-909 Caldas das Taipas-Guimarães, Portugal; ICVS/3B's, PT Government Associated Laboratory, Braga/Guimarães, Portugal.

G.I.R. Bioforge, University of Valladolid, Edificio I+D, Paseo de Belén, 11, 47011 Valladolid, Spain; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valladolid, Spain.

出版信息

Acta Biomater. 2014 Jun;10(6):2653-62. doi: 10.1016/j.actbio.2014.02.020. Epub 2014 Feb 21.

Abstract

Multilayered microcapsules of chitosan and biomimetic elastin-like recombinamers (ELRs) were prepared envisaging the intracellular delivery of active agents. Two ELRs containing either a bioactive RGD sequence or a scrambled non-functional RDG were used to construct two types of functionalized polymeric microcapsules, both of spherical shape ∼4μm in diameter. Cell viability studies with human mesenchymal stem cells (hMSCs) were performed using microcapsule/cell ratios between 5:1 and 100:1. After 3 and 72h of co-incubation, no signs of cytotoxicity were found, but cells incubated with RGD-functionalized microcapsules exhibited higher viability values than RDG cells. The internalization efficacy and bioavailability of encapsulated DQ-ovalbumin were assessed by monitoring the fluorescence changes in the cargo. The data show that surface functionalization did not significantly influence internalization by hMSCs, but the bioavailability of DQ-ovalbumin degraded faster when encapsulated within RGD-functionalized microcapsules. The microcapsules developed show promise for intracellular drug delivery with increased drug efficacy.

摘要

采用壳聚糖和仿生弹性蛋白样重组体(ELRs)的多层微胶囊来实现活性物质的细胞内递呈。使用两种含有生物活性 RGD 序列或非功能 RDG 序列的 ELR 来构建两种类型的功能化聚合物微胶囊,其均为直径约 4μm 的球形。使用微胶囊/细胞比例在 5:1 到 100:1 之间,对人骨髓间充质干细胞(hMSCs)进行细胞活力研究。共孵育 3 和 72h 后,未发现细胞毒性迹象,但与 RDG 细胞相比,用 RGD 功能化微胶囊孵育的细胞显示出更高的活力值。通过监测货物的荧光变化来评估包封的 DQ-卵清蛋白的内化功效和生物利用度。数据表明,表面功能化对 hMSCs 的内化没有显著影响,但当包封在 RGD 功能化微胶囊内时,DQ-卵清蛋白的生物利用度降解更快。所开发的微胶囊在提高药物功效的细胞内药物输送方面具有应用前景。

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