检测脑脊液中CFP10ESAT-6对结核性脑膜炎诊断意义的研究
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摘要
目的:改进斑点酶联免疫吸附试验(dot enzyme linked immunosorbant assay, Dot-ELISA),采用真空泵抽吸法浓缩检测样本,以期提高此方法的敏感性;通过实验分析此方法改进前后的优劣,并确定试验程序中最适工作条件及方法的重复性和稳定性。应用改进的Dot-ELISA检测脑脊液(cerebrospinal fluid,CSF)中结核分枝杆菌(mycobacterium tuberculosis,MTB)特异性抗原培养滤液蛋白10(culture filtrate protein 10,CFP10)和6000早期分泌性抗原靶(6kDa early secretory antigenic target,ESAT-6),对比其他辅助检查及同类研究,评价其对结核性脑膜炎(tuberculous meningitis,TBM)的诊断价值。
     方法:
     1、用改进前和改进后的Dot-ELISA检测同一批临床确诊的结核性胸腔积液25例和非结核性胸腔积液31例,统计分析方法改进前后有无差异性;改变实验程序中的工作条件,利用对比实验确定最适工作条件,并评价改进后此方法的重复性和稳定性。2、收集58例临床诊为TBM患者的CSF,53例非TBM患者的CSF,应用改进后的Dot-ELISA分别检测CSF中CFP10和ESAT-6,同时对入选的患者和采集的CSF作相关的病史统计和辅助检查,并对结果进行统计分析。
     结果:
     1、改进前Dot-ELISA检测的敏感性为76.0%,改进后的敏感性为92.0%,用最适工作条件检测的敏感性为96.0%,改进后和用最适工作条件与改进前比较存在统计学差异(P<0.05);改进前特异性为93.5%,改进后和用最适条件时特异性皆为90.3%,改进前后特异性比较无统计学差异(P>0.05),验证其特异性的阻断实验结果为阳性;重复性、稳定性试验结果表明,所建立的Dot-ELISA检测结果的可重复率为100%。2、检测CSF中CFP10抗原的敏感性为93.1%,特异性为92.5%;检测ESAT-6抗原的敏感性为91.4%,特异性为94.3%;敏感性和特异性均普遍高于针对MTB菌体或菌体物质进行的检测及同类研究,如抗酸染色、结核杆菌培养、PCR等。
     结论:
     1、所建立的Dot-ELISA是一种有较高敏感性和特异性且重复性和稳定性较好的检测方法,能用于结核特异性抗原的检测和结核性胸腔积液的辅助诊断。2、应用改进的Dot-ELISA检测CSF中CFP10和ESAT-6对诊断TBM有很高的敏感性和特异性,明显优于针对MTB菌体或菌体物质进行的检测和同类研究,目前其可作为优于其它辅助检查的一项新的检查手段用于临床TBM的诊断。3、本研究为MTB特异性抗原用于结核病的诊断奠定了基础。
Objection: Our study improves dot enzyme linked immunosorbant assay (Dot-ELISA), using vacuum pump to aspirate the water in specimens to concentrate them, in order to increase the sensitivity of the method. Use experiments to analyze advantages and disadvantages of the improved method, and to determine the best working condition and the repeatability and the stability of the developed method. Using the improved Dot-ELISA method to detect culture filtrate protein 10 (CFP-10) and 6000 early secretory antigenic target (ESAT-6), two small protein antigen secreted by M.tuberculosis (MTB), in cerebrospinal fluid (CSF). And compare them with other examination and studies in order to judge and analyse their value in diagnosing tuberculous meningitis (TBM).
     Methods: We detected the same batch of pleural effusion using the old method and the developed method respectively, which include 25 specimens of tuberculous pleural effusion and 31 non-tuberculous and analyzed the difference of the two methods. Determine the repeatability and stability as well as the best working condition by changing the working condition. 111 specimens of cerebrospinal fluid were collected, in which 58 specimens were clinically diagnosed as tuberculous meningitis and 53 as non-tuberlous. CFP10 and ESAT-6 were detected in the cerebrospinal fluid using Dot ELISA method and the results were analyzed.
     Results: The sensibility of the old method was 76.0%, the improvement method was 92.0%. The sensibility was 96.0% when the best working condition used in the method. There existed statistical difference between the old method and the improvement method as well as using the best working condition (P<0.05). The specificity of the old method was 93.5%. The specificity of improvement method and it in the best working condition was 90.3%. But the specificity doesn’t have statistical difference. Blocking experiment which can verify its specificity was positive.The repeatability and stability were good, particularly the repetition rate of the positive results was 100%. The sensitivities of detecting CFP10 and ESAT-6 antigen were 93.1% and 91.4% respectively, and the specificities were 92.5% and 94.3% respectively. The sensitivities and specificities are generally higher compared with those detecting M.tuberculosis or materials of M.tuberculosis, for example, acid-fast staining or mycobacterium tuberculosis culture or PCR.
     Conclusion: It shows that the developed Dot-ELISA method is sensitive, specific, stable, and can be used to detect specific antigen of mycobacterium tuberculosis and diagnosis of the tuberculosis.Using Dot-ELISA method to detect CFP10 and ESAT-6 in cerebrospinal fluid to diagnose tuberculous meningitis has a high detection rate. The sensitivities and specificities are generally higher compared with those detecting M.tuberculosis or materials of M.tuberculosis. It can be used in diagnosing tuberculous meningitis as a new method which is better than other methods. Our study provided the evidence for the specific antigen of M.tuberculosis used in diagnosing tuberculosis.
引文
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