小鼠心肌蛋白质组双向电泳技术的建立及其优化

背景:双向电泳对蛋白质混合物的分离和分析精确而有效,已成为研究蛋白质组最有价值的核心技术之一;以小鼠模型为研究对象,模拟人体疾病状态,是研究心血管疾病的重要手段之一。建立并优化小鼠心肌蛋白质组双向电泳技术将为以后的心脏疾病研究奠定基础。目的:建立并优化小鼠心肌蛋白质组双向电泳技术。设计:以小鼠为研究对象,观察对比研究。单位:南方医科大学附属南方医院病理科。材料:实验于2004-02/09在南方医科大学附属南方医院病理科完成。选取4～5周龄雄性无特殊病原体级BABL/c小鼠12只,体质量12～15g,由南方医科大学动物中心提供。方法:在麻醉状态下脱臼处死小鼠,取心脏,对不同的蛋白提取方法、上样缓冲液、范围的固相pH胶条、蛋白上样量、染色方法等进行对比分析,扫描并数字化,再进行图像分析。建立并优化实验中的各个环节。主要观察指标:蛋白分离的效果和实验的可重复性。结果:心肌特异的裂解方案能在pH4～7胶条上分离约910个蛋白点;银染上样量200μg,考染1000μg较为适宜;正常小鼠心肌组织在17cmpH3～10L的胶上可分离约(920±30)个蛋白点,pH4～7L的胶条上,可分离(880±30)个左右蛋白点;蛋白点平均匹配率为86.9%。结论:实验结果显示,对小鼠心肌组织蛋白质双向电泳各方面条件进行调整和优化,建立了相对稳定的心肌蛋白分离方法。

Establishment and optimization of two-dimensional electrophoresis for myocardial proteomes of mice

BACKGROUND: Two-dimensional electrophoresis (2-DE) is precise and effective for the isolation and analysis of complex protein mixtures, has become one of valuable key techniques for proteome. Mice models were as research subjects to model human disease status, one of important methods for cardiovascular disease. The establishment and optimization of 2-DE for proteomes of mice myocardium will provide basis for heart disease.OBJECTIVE: To establish and optimize a stable technique of 2-DE for proteomic analysis of mice myocardium.DESIGN: Mice were used as research subjects, observational comparative study.SETTING: Department of Pathology, Nanfang Hospital Affiliated to Southern Medical University.PARTICIPANTS: The experiment was performed at the Department of Pathology, Nanfang Hospital Affiliated to Southern Medical University between February and September 2004. Totally 12 male BABL/c mice of 4-5 weeks without special-pathogen free with the body mass of 12-15 g were selected, which was provided by the Experimental Animal Center of Southern Medical University.METHODS: The mice were put to death by dislocation of cervical vertebra under drugged state to obtain heart. Various protein extraction method,loading sampling buffer, strip range of IPG, sampling volume of protein,staining method and so on were compared, analyzed, scanned and digilized,and then performing image analysis. Each link in the study was established and optimized.MAIN OUTCOME MEASURES: Resolution of protein and reproducibility of the trial.RESULTS: A method that was optimal for cardiac tissue can isolate about a total of 910 protein spots on pH 4-7 gel strips. 200 μg was fit for silver stain while 1000 μg was for Coomassie stains. It was found that in the myocardium of normal mice about (920±30) protein spots were obtained in 17 em pH 3-10 L gel strip, while around (880±30) were gained in the pH 4-7 L gel strip. The mean matching rate achieves to 86. 9%.CONCLUSION: The findings of the trial showed that 2-DE technique can be effectively applied for proteomics of myocardium of mice to regulate and optimize, and relatively stable separation method of myocardial protein was established.