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Serological detection of T. gondii infection in humans using an immunochromatographic assay based on dense granule protein 7.
Parasitology International ( IF 1.5 ) Pub Date : 2020-02-21 , DOI: 10.1016/j.parint.2020.102089
Rochelle Haidee D Ybañez 1 , Yoshifumi Nishikawa 1
Affiliation  

Toxoplasma gondii causes toxoplasmosis, one of the world's most common parasitic diseases. It secretes large amounts of dense granule antigens (TgGRAs), which are crucial to the parasite's survivability. TgGRA7 is found abundantly on the surface of host cells, within the parasitophorous vacuole lumen and membrane, and the host cell cytosol. It stimulates a strong antibody response during acute and chronic infections. While it has been well utilized as an antigen for enzyme-linked immunosorbent assay (ELISA), only one report has documented its efficacy as an antigen for an immunochromatographic test (ICT) in pigs. To date, there is no study yet documenting its use for ICT in human toxoplasmosis. Here, we validated the efficacy of the TgGRA7-ICT we developed by testing 88 human sera. Results were compared with those obtained by ELISA based on TgGRA7, a commercial ELISA, and latex agglutination test (LAT). With high sensitivity, specificity, and kappa values, our TgGRA7-ICT results revealed very good agreement with standard test results. We also found a strong correlation between the relative ICT band intensity and absorbance values in the ELISA. Altogether, our data suggest that the current ICT with TgGRA7 is a reliable test for the diagnosis of human toxoplasmosis, which produced results similar to conventional serological methods. Thus, this can be used as a screening tool for routine testing of toxoplasmosis and a good option for point of care application. The present study also documents the first utilization of TgGRA7 as an antigen for ICT for the serodiagnosis of human toxoplasmosis.



中文翻译:

使用基于致密颗粒蛋白7的免疫色谱法对人的弓形虫感染进行血清学检测。

弓形虫引起弓形虫病,弓形虫病是世界上最常见的寄生虫病之一。它分泌大量致密颗粒抗原(TgGRAs),这对寄生虫的生存能力至关重要。TgGRA7在寄生细胞的液泡内腔和膜内以及宿主细胞的细胞质中大量存在于宿主细胞的表面。在急性和慢性感染期间,它会刺激强烈的抗体反应。尽管它已被很好地用作酶联免疫吸附测定(ELISA)的抗原,但只有一篇报道证明了其作为猪免疫色谱测试(ICT)抗原的功效。迄今为止,尚无研究证明其可用于人类弓形虫病的ICT。在这里,我们通过测试88个人血清验证了我们开发的TgGRA7-ICT的功效。将结果与通过基于TgGRA7的ELISA获得的结果进行比较,商业ELISA和乳胶凝集试验(LAT)。我们的TgGRA7-ICT结果具有很高的灵敏度,特异性和kappa值,与标准测试结果非常吻合。我们还在ELISA中发现了相对ICT谱带强度与吸光度值之间的强相关性。总而言之,我们的数据表明,目前使用TgGRA7的ICT是诊断人类弓形虫病的可靠测试,其结果与传统的血清学方法相似。因此,它可以用作弓形虫病常规检测的筛查工具,并且是即时护理的良好选择。本研究还记录了TgGRA7作为ICT抗原用于人类弓形虫病血清诊断的首次应用。我们的TgGRA7-ICT结果与标准测试结果非常吻合。我们还发现ELISA中相对ICT谱带强度与吸光度值之间存在很强的相关性。总而言之,我们的数据表明,目前使用TgGRA7的ICT是诊断人类弓形虫病的可靠测试,其结果与传统的血清学方法相似。因此,它可以用作弓形虫病常规检测的筛查工具,并且是即时护理的良好选择。本研究还记录了TgGRA7作为ICT抗原用于人类弓形虫病血清诊断的首次利用。我们的TgGRA7-ICT结果与标准测试结果非常吻合。我们还发现ELISA中相对ICT谱带强度与吸光度值之间存在很强的相关性。总而言之,我们的数据表明,目前使用TgGRA7的ICT是诊断人类弓形虫病的可靠测试,其结果与传统的血清学方法相似。因此,它可以用作弓形虫病常规检测的筛查工具,并且是即时护理的良好选择。本研究还记录了TgGRA7作为ICT抗原用于人类弓形虫病血清诊断的首次利用。我们的数据表明,目前使用TgGRA7的ICT是诊断人类弓形虫病的可靠测试,其产生的结果与常规血清学方法相似。因此,它可以用作弓形虫病常规检测的筛查工具,并且是即时护理的良好选择。本研究还记录了TgGRA7作为ICT抗原用于人类弓形虫病血清诊断的首次应用。我们的数据表明,目前使用TgGRA7的ICT是诊断人类弓形虫病的可靠测试,其产生的结果与常规血清学方法相似。因此,它可以用作弓形虫病常规检测的筛查工具,并且是即时护理的良好选择。本研究还记录了TgGRA7作为ICT抗原用于人类弓形虫病血清诊断的首次应用。

更新日期:2020-02-21
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