摘要
荧光共振能量转移技术(fluorescence resonance energy transfer,FRET)作为一种经典的荧光检测技术,已经广泛运用于生物科学研究中,开发了一系列基于FRET技术的荧光检测探针。半胱氨酸蛋白酶家族(cysteine aspartic acid specific protease,Caspase)在细胞凋亡通路中发挥着十分重要的作用,尤其是位于死亡受体介导的凋亡通路起始位置的Caspase-8,它的激活能引发后续的一系列Caspase酶原的激活并引起细胞的凋亡。因此,Caspase-8活性的检测在细胞凋亡检测中具有非常重要的意义。本文基于蛋白酶类FRET荧光探针原理设计了一个能检测活细胞内Caspase-8活性变化的荧光探针,并且在流式细胞仪上利用FRET技术检测了细胞凋亡诱导剂特异性激活的Caspase-8活性,从而证明了所构建的探针检测Caspase-8活性的有效性和特异性。结果表明,所设计的探针能够特异性地响应细胞凋亡诱导中引起细胞内Caspase-8酶活性的变化,并且能够利用流式细胞技术得以快速定量检测。本研究为在活细胞中检测Caspase-8活性提供了一种更加方便快捷的检测方法。
As a classic fluorescent detect technique, fluorescence resonance energy transfer （FRET） has been widely used in biological researches. Researchers have developed a series of fluorescence detect probes which were based on FRET. Caspase family plays an important role in apoptosis pathway, especially Caspase-8 which located, at the initial of death receptor mediated apoptosis pathway, whose its activation can trigger subsequent precaspases＇ activation and lead to apoptosis. So it is of great significance to detect the activation of Caspase-8 in apoptosis assay. In this study, a fluorescent probe based on FRET has been designed which can detect the activity change of Caspase-8 in cells. To identify the effectiveness and specificity of the probe, we measure the Caspase-8 activity under the Caspase-8 specifically activated apoptosis inducer RGD-TRAIL with the flow cytometry FRET detection platform. The results show that the probe can respond to the activity change of Caspase-8 in apoptotic cells, and the change can be quantified rapidly by flow cytometry. The study provides a more efficient and convenient detection method of Caspase-8 activity in living cells.
出处
《药学学报》
CAS
CSCD
北大核心
2015年第3期291-297,共7页
Acta Pharmaceutica Sinica
基金
国家科技部纳米重大研究计划资助项目(2011CB933502)
干细胞重大研究计划资助项目(2012CB967004)
江苏省科技支撑计划资助项目(BE2013630)
常州市科技支撑计划资助项目(CE20135013)
