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Biological characteristics of superparamagnetic iron oxid with amphiphilic polyethylenimine-labeled articular chondrocytes
Author(s): Lin Xiao1, Wang Fengling1, Chen Jiarong1, Lin Xingde2, Yang Liu1
Pages: 284-
287
Year: 2013
Issue:
4
Journal: Journal of Third Military Medical University
Keyword: SPIO; 透明软骨细胞; 磁标记;
Abstract: 目的研究聚乙烯亚胺(polyethylenimine,PEI)包被的超顺磁性氧化铁粒子(superparamagnetic iron oxid,SPIO)对透明软骨细胞增殖和分泌Ⅱ型胶原蛋白功能的影响,探讨其标记软骨细胞的适宜标记浓度和适宜孵育时间。方法取1~3月龄巴马小香猪后膝关节透明软骨体外培养的第2代细胞,以2、4、6、8、10、12、14μg/mL浓度的PEI-SPIO标记液标记的软骨细胞为实验组,没有PEI-SPIO标记的软骨细胞作为对照组,分别在37℃培养箱中培育6、12、18、24、30 h,通过普鲁士蓝染色、透射电镜、细胞内铁含量、WST-1和半定量RT-PCR法检测,筛选出PEI-SPIO的最佳标记浓度和最佳孵育时间。结果 6、8、10、12、14μg/mL组标记后的普鲁士蓝染色显示90%以上的细胞被铁粒子标记;细胞内铁含量的测定结果显示标记时间超过24 h,各组细胞内铁含量基本不再增加;WST-1检测磁标记的细胞毒性结果显示,对照组与实验组无统计学差异(P>0.05)。8μg/mL标记的软骨细胞,其Ⅱ型胶原蛋白RT-PCR条带的灰度值比值与未标记软骨细胞比较有明显降低[(13.04±0.60)%vs(18.89±1.26)%,P<0.05];6μg/mL标记的软骨细胞,其条带的灰度值比值与未标记软骨细胞比较无明显差异[(27.32±1.02)%vs(28.56±1.15)%,P>0.05]。结论 PEI-SPIO可达到安全有效标记软骨细胞的要求,PEI-SPIO标记液为6μg/mL,标记24 h是PEI-SPIO标记软骨细胞的适宜标记浓度和标记时间,既可达到标记软骨细胞的目的,又不对软骨细胞的活性、增殖和Ⅱ型胶原蛋白基因的表达造成影响。
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