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概念验证MALDI-TOF-MS试验用于检测Clostridioides difficile感染中毒素B酶活性

Josef Dvorak^1,2, Lukáš Fojtík^1,2, Ljubina Adámková¹

¹Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Vestec, Czechia.

Microbiology spectrum

|March 31, 2025

概括

这项研究提出了一种新方法,用于直接在便样本中检测Clostridioides difficile Toxin B的活性,使用矩阵辅助激光吸附/电离飞行时间质谱法. 这种方法可以更快,更准确地评估感染严重程度,而不需要培养细菌.

科学领域:

临床微生物学临床微生物学
质谱测量质量谱测量
毒理学毒理学毒理学

背景情况:

目前对Clostridioides difficile感染 (CDI) 的诊断依赖于病原体识别或毒素度,这并不总是与疾病严重程度相关.
已建立的诊断方法需要病原体培养,增加时间,劳动力和耗材,对于无氧细菌来说是复杂的.
现有的检测方法对根据毒素的实际生化活性来衡量感染严重性的能力有限.

研究的目的:

开发和验证一种新型试验,用于直接在人体便样本中功能检测Clostridioides difficile Toxin B活性.
通过测量其在RhoA蛋白质基质上的酶活性来间接确定毒素B的存在和强度.
为了证明使用矩阵辅助激光脱/离子化飞行时间 (MALDI-TOF) 质谱仪用于快速毒素活性评估的可行性.

主要方法:

在NeutrAvidin MALDI芯片上进行现场测试的开发,该芯片与生物标记的RhoA蛋白质基质功能化.
将固定基质暴露在便样本中,以允许由B毒素进行酶性糖化.
通过MALDI-TOF质谱测试检测反应产物,确定表明毒素B活性的质量差异.

主要成果:

概念验证试验成功地通过测量RhoA基质的糖化,间接检测到毒素B活性.
该试验通过使用患者便样本和Clostridioides difficile.的细胞培养来验证.
整个过程,从采样到质谱检测,都是在修改后的MALDI芯片上进行的.

结论:

这种基于质谱的新型MALDI-TOF测定提供了一种快速和直接的方法,用于评估复杂临床矩阵中的Clostridioides difficile Toxin B酶活性.
该试验绕过了病原体培养的需要,为临床微生物学实验室提供了显著的优势.
这种方法有可能通过提供更准确的感染严重程度测量来改善CDI的诊断和管理.

关键词:

这是C. difficile.马尔迪 - 托夫 - 马尔迪毒素B是一种毒素.诊断诊断诊断诊断诊断

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