传感器类型
综述或非传感器论文
检测对象
细胞迁移能力(cell migration ability)、GRP78 表达水平(GRP78 expression)、波形蛋白表达水平(vimentin expression);样品基质:肝癌细胞培养体系(HepJ5、Mahlavu、skHep-1)
检测原理
本文并非报道新型生物传感器,而是利用xCelligence实时细胞分析系统监测肝癌细胞迁移。实验采用CIM-plate 16,上室接种无血清培养基中的HCC细胞,下室加入10% FCS形成趋化梯度。细胞穿过8 μm膜并贴附于膜下微电极,细胞数量与贴附状态改变局部阻抗,形成细胞指数。GRP78沉默或过表达通过调控vimentin表达影响上皮间质转化相关迁移能力:GRP78下调使vimentin升高,迁移细胞增多,细胞指数变化增大;vimentin敲低则迁移下降。RTCA DP按设定频率记录,RTCA software 1.2分析;Transwell结晶紫染色计数用于验证。
检测灵敏度
原文未报告 LOD、线性范围、灵敏度斜率或相关系数。
效应效果
原文未报告选择性、抗干扰、稳定性、RSD、实际样品加标回收率或与ELISA/HPLC/qPCR等方法的定量对比。实验重复至少三次,数据以mean±SD表示,组间比较采用双尾t检验,显著性以*P<.05标注。xCelligence系统显示GRP78沉默的HepJ5细胞增殖率与对照相似,但迁移能力显著增强;Mahlavu细胞中GRP78沉默同样增强迁移;skHep-1细胞中过表达GRP78则降低迁移。Transwell实验与xCelligence结果一致。作者主张GRP78沉默通过上调vimentin增强HCC迁移,为HCC转移机制研究和潜在治疗靶点提供依据。
传感器的构成
- 换能器电极:CIM-plate 16 膜下微电极(microelectrodes),用于实时阻抗/细胞指数检测
- 基底/迁移膜:CIM-plate 16 带 8 μm 孔径膜,分隔上下室并允许细胞迁移
- 样品/识别层:HCC 细胞(HepJ5、Mahlavu、skHep-1)接种于上室无血清培养基
- 趋化信号层:下室 10% FCS 培养基,诱导细胞迁移
- 读出仪器:RTCA DP 实时细胞分析系统,RTCA software 1.2 分析细胞指数
中文摘要
背景:葡萄糖调节蛋白78(GRP78)在胚胎发育和肿瘤进展中发挥重要作用,但其在肝细胞癌(HCC)转移中的调控机制尚不清楚。方法:本研究采用RNA沉默和cDNA表达载体调控HCC细胞中靶基因表达,并应用Transwell迁移实验和xCelligence生物传感器系统检测HCC细胞的增殖与迁移能力。结果:在HepJ5和Mahlavu细胞中沉默GRP78可增强细胞迁移;在skHep-1细胞中过表达GRP78则抑制迁移能力。机制分析显示,GRP78下调导致HCC细胞中波形蛋白(vimentin)表达升高;而抑制vimentin表达可降低HCC细胞迁移能力,提示vimentin表达水平调控细胞迁移。结论:在HCC细胞中沉默GRP78可能通过上调vimentin表达增强细胞迁移,为理解HCC转移机制提供新线索。
英文摘要
BACKGROUND: Glucose-regulated protein 78 (GRP78) plays an important role in embryonic development and cancer progression. However, there is little information regarding the regulation of GRP78 in hepatocellular carcinoma (HCC) metastasis.
METHODS: We used RNA silencing and cDNA expression vectors to manipulate target gene expression in HCC cells. The transwell migration assay and xCelligence biosensor system were applied to determine the proliferatory and migratory ability of the HCC cells.
RESULTS: In this study, we found that GRP78 silencing enhanced cell migration in both HepJ5 and Mahlavu cells. Overexpressed GRP78 in skHep1 cells suppressed the migratory ability. In the insight mechanism dissection for GRP78-mediated cancer migration, we found that downregulation of GRP78 caused the increase of vimentin expression on HCC cells. Suppressed vimentin expression also decreased the migratory ability on HCC, indicating that vimentin expression levels modulated the cell migratory ability.
CONCLUSION: We found that silencing GRP78 in HCC cells may enhance cell migration through the increase of vimentin expression.