中文摘要：

背景：聚乳酸聚乙醇酸支架材料广泛应用于组织工程学领域，但其细胞黏附性较差、缺乏活性功能基团以及疏水性较强等缺点限制了其进一步的发展和应用。目的：观察小鼠神经干细胞与静电纺丝聚乳酸聚乙醇酸/聚乙二醇共聚物纳米纤维支架材料的体外相容性。方法：自孕15 d CD-1小鼠胚胎大脑皮质分离培养小鼠神经干细胞。静电纺丝法制备聚乳酸聚乙醇酸和聚乳酸聚乙醇酸/聚乙二醇纳米纤维支架材料，扫描电镜观察材料结构；取第5代神经干细胞分别接种于聚乳酸聚乙醇酸和静电纺丝聚乳酸聚乙醇酸/聚乙二醇纳米纤维支架材料上，进行体外培养。结果与结论：扫描电镜检测显示，两种支架材料呈现相互交联的多孔网状结构。聚乳酸聚乙醇酸组和静电纺丝聚乳酸聚乙醇酸/聚乙二醇组纤维直径和孔隙率差异无显著性意义（P 〉0.05）。CCK-8检测显示，两种材料无明显细胞毒性。神经干细胞在支架材料中生长良好，两组吸光度值均随培养时间延长而增大，两组在培养1，3，5，7，9，11 d吸光度值差异均有显著性意义（P 〈0.05）。两组材料培养3，6，9 h，静电纺丝聚乳酸聚乙醇酸/聚乙二醇组的细胞黏附率明显高于聚乳酸聚乙醇酸组（P 〈0.05）。Hoechst染色显示两组细胞核质均染，形态正常，静电纺丝聚乳酸聚乙醇酸/聚乙二醇组细胞数量明显多于聚乳酸聚乙醇酸组（P 〈0.05）。扫描电镜观察显示，与聚乳酸聚乙醇酸组相比，静电纺丝聚乳酸聚乙醇酸/聚乙二醇组神经干细胞在支架上的生长情况和基质分泌更好。结果说明，静电纺丝法制备的静电纺丝聚乳酸聚乙醇酸/聚乙二醇纳米纤维支架细胞生物相容性良好，安全无毒，具备合适的孔径和孔隙率，适宜神经干细胞生长，是一种适用于组织工程优质的支架载体。

英文摘要：

BACKGROUND：Poly（lactide-co-glycolide） （PLGA） scaffold is widely used in tissue engineering, but its poor cel adhesion ability and strong hydrophobicity limit its further development and application. OBJECTIVE： To study the biocompatibility of electrospun poly （lactide-co-glycolide）/polyethylene glycol （PLGA-PEG） nanofibrous scaffolds with mouse neural stem celsin vitro. METHODS：Neural stem cels were isolated from embryos of CD-1 mice at 15 embryonic days. Electrospinning was used to prepare PLGA and PLGA-PEG nanofibrous scaffolds. Scanning electron microscope was used for scanning observation of scaffolds. The 5th passage neural stem cels were seeded onto PLGA and PLGA-PEG scaffolds respectively, and culturedin vitro.＆amp;nbsp;RESULTS AND CONCLUSION： Interconnected porous network structure was observed in both two kinds of scaffolds under the scanning electron microscope. Fiber diameters and porosities of PLGA and PLGA-PEG scaffolds showed no significant differences （P 〉 0.05）. Cel Counting Kit-8 detection showed neural stem cels grew wel on both two kinds of scaffolds and the absorbance value of two groups increased continuously with incubation time （1, 3, 5, 7, 9, 11 days）. And there were statisticaly significant differences in the absorbance values between two groups at each time point （P 〈 0.05）. Moreover, the cel adhesion rate was significantly higher in the PLGA-PEG group than in the PLGA group at 3, 6, 9 hours of culture （P 〈 0.05）. Hoechst 33342 staining showed normal morphology and quality of the nuclei, and significantly more cels were observed in the PLGA-PEG group than the PLGA group （P 〈 0.05）. Under the scanning electron microscope, compared with the PLGA scaffold, the PLGA-PEG scaffold was better for growth and matrix secretion of neural stem cels. In conclusion, PLGA-PEG nanofibrous scaffolds prepared by electrospinning are safe, non-toxic and suitable for neural stem cels growth with wel biocompatibility, appropriate aperture and porosity.