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Surface modification of PLGA microspheres

机译:PLGA微球的表面改性

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Microspheres made of poly(lactic-co-glycolic acid)(PLGA) are biocompatible and biodegradable, rendering them a promising tool in the context of drug delivery. However, nonspecific adsorption of plasma proteins on PLGA micro- and nanospheres is a main limitation of drug targeting. Poly(L-lysine)-g-poly(ethylene glycol) (PLL-g-PEG), physisorbed on flat metal oxide surfaces, has previously been shown to suppress protein adsorption drastically. The goal of our work was to characterize the efficiency of the protein repellent character of PLL-g-PEG on PLGA microspheres and to show the feasibility of introducing functional groups on the PLGA microspheres via function-alized PLL-g-PEG. To quantify the adsorbed amount of protein, a semiquantitative method that uses confocal laser scanning microscopy (CLSM) was applied. The first part of the experiment confirms the feasibility of introducing specific functional groups on PLL-g-PEG-coated PLGA microspheres. In the second part of the experiment, PLL-g-PEG-coated PLGA microspheres show a drastic decrease of adsorbed proteins by two orders of magnitude in comparison to uncoated PLGA microspheres. Low protein-binding, functionalizable microspheres provide a fundamental basis for the design of drug delivery and biosensor systems.
机译:由聚乳酸-乙醇酸共聚物(PLGA)制成的微球具有生物相容性和生物可降解性,使其成为药物输送领域的有前途的工具。但是,血浆蛋白在PLGA微球和纳米球上的非特异性吸附是靶向药物的主要限制。以前已证明,聚(L-赖氨酸)-g-聚(乙二醇)(PLL-g-PEG)物理吸附在平坦的金属氧化物表面上,可以显着抑制蛋白质的吸附。我们工作的目的是表征PLGA微球上PLL-g-PEG的蛋白质排斥特性的效率,并展示通过功能化的PLL-g-PEG在PLGA微球上引入官能团的可行性。为了量化蛋白质的吸附量,应用了使用共聚焦激光扫描显微镜(CLSM)的半定量方法。实验的第一部分证实了在涂有PLL-g-PEG的PLGA微球上引入特定官能团的可行性。在实验的第二部分中,与未涂覆的PLGA微球相比,涂覆PLL-g-PEG的PLGA微球显示出吸附蛋白的数量急剧减少了两个数量级。低蛋白结合性,可功能化的微球为药物输送和生物传感器系统的设计提供了基础。

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