建立超敏ELISA-双酶底物循环法检测tau蛋白

利用酶联免疫吸附法(ELISA)的高特异性和双酶底物循环的高灵敏度，建立了ELISA-双酶底物循环扩增检测法.用传统ELISA测定纯化tau蛋白和阿尔茨海默病异常磷酸化tau蛋白的范围值分别为1～32 ng和0.2～10 ng，而此法的测定范围值分别为0.75～200 pg和0.5～50 pg，比传统ELISA的灵敏度分别提高1 300倍和400倍，可测定范围值亦分别扩大了8.5倍和2倍.可准确测定阿尔茨海默病患者脑脊液样品中的微量tau蛋白和异常磷酸化tau蛋白，为阿尔茨海默病的早期诊断和鉴别诊断提供了新技术.

Development of an Ultrasensitive ELISA-dienzyme Substrate Recycle Assay for Measurement of Cerebrospinal Fluid Tau

On the basis of conventional enzyme-linked immunosorbent assay (ELISA) and dienzyme substrate recycle, An highly specific and ultrasensitive biochemical assay, named ELISA-dienzyme substrate recycle was developed. The detective range of conventional ELISA for measuring recombinant tau and abnormally phosphorylated tau purified from Alzheimer disease brain was 1ng to 32 ng. It was 0.75pg to 200pg and 0.5pg to 50pg by ELISA-dienzyme substrate recycle. Compared with the conventional method, the sensitivity of the technique established in the present study increased 400 and 1300 times, with a enlarged detective range of 8.5 and 10 times, respectively. It could detect abnormally phosphorylated tau in cerebrospinal fluid of Alzheimer disease and used effectively for the diagnosis of the disease.