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Role of PLLA Plasma Surface Modification in the Interaction with Human Marrow Stromal Cells

机译:PLLA血浆表面修饰在与人骨髓基质细胞相互作用中的作用

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The effects of oxygen-based radio frequency plasma enhanced chemical vapor deposition (rf PECVD) on the surface of poly(L-lactide) (PLLA) polymers and the influence thereof on protein adsorption and on bone-cell behavior have been studied. Thin films and porous scaffolds based on PLLA polymer were developed, and the role of surface modifications were investigated extensively. PECVD surface treatments were used to alter surface functionality and modulate protein adsorption on the PLLA polymer matrix. In particular, Bovine Serum Albumine fluorescein isothiocyanate (fitc-BSA) conjugate adsorption on patterned surfaces of treated PLLA was analyzed by fluorescence microscopy. Human marrow stromal cells (MSCs) were cultured on scaffolds and cell adhesion and morphology were assessed using fluorescence microscopy. The results indicated that the PLLA surface became hydrophilic and its roughness increased with the treatment time and it had a dominant influence on the adsorption process of the protein. The outcome of the plasma treatment of various PLLA surfaces has been shown to be the up-regulator of the cell-adhesive proteins expression and consequently the improvement of cell adhesion and growth. Oxygen-treated PLLA promoted higher adhesion and proliferation of the MSCs in comparison to the untreated samples. It can be concluded that following plasma treatment, PLLA samples show enhanced affinity for osteoprogenitor cells.
机译:研究了基于氧的射频等离子体增强化学气相沉积(rf PECVD)在聚(L-丙交酯)(PLLA)聚合物表面上的作用及其对蛋白质吸附和骨细胞行为的影响。开发了基于PLLA聚合物的薄膜和多孔支架,并广泛研究了表面改性的作用。 PECVD表面处理用于改变表面功能并调节蛋白质在PLLA聚合物基质上的吸附。特别地,通过荧光显微镜分析了牛血清白蛋白荧光素异硫氰酸荧光素(fitc-BSA)缀合物在处理过的PLLA的图案化表面上的吸附。在支架上培养人骨髓基质细胞(MSCs),并使用荧光显微镜评估细胞粘附和形态。结果表明,PLLA表面变为亲水性,其粗糙度随处理时间的增加而增加,并且对蛋白质的吸附过程起主要作用。各种PLLA表面进行等离子处理的结果表明,它可以上调细胞粘附蛋白的表达,从而改善细胞粘附和生长。与未经处理的样品相比,经氧气处理的PLLA促进了MSC的更高粘附和增殖。可以得出结论,血浆处理后,PLLA样品显示出对骨祖细胞的亲和力增强。

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