Longitudinal analysis of anti-SARS-CoV-2 neutralizing antibody (NAb) titers in vaccinees using a novel giant magnetoresistive (GMR) assay.

Longitudinal analysis of anti-SARS-CoV-2 neutralizing antibody (NAb) titers in vaccinees using a novel giant magnetoresistive (GMR) assay.
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DOI:
10.1016/j.snb.2023.133773
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发表时间:
2023-07-15
影响因子:
8.4
通讯作者:
Wang, Shan X.
Wang, Shan X.
中科院分区:
化学1区
文献类型:
--
作者:
Ng, Elaine;Choi, Christopher;Wang, Shan X.

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COVID-19大流行凸显了在全人群水平上监测免疫力重要相关因素的必要性。为此,我们已经开发了一种竞争性测定,以评估中和抗体(NAb)效价的巨磁阻(GMR)生物传感器平台。我们将我们的生物传感器的临床性能与Ortho的VITROS Anti-SARS-CoV-2 IgG定量抗体检测等成熟技术进行了比较。VITROS检测试剂盒和GMR检测试剂盒之间获得的结果显示相关性(r = −0.93)。然后,我们使用已使用病灶减少中和试验(FRNT)进行检测的患者血浆样本验证了该测定法。从我们的GMR检测中获得的结果显示出先前确定的接种后2周NAb滴度增加的趋势。我们进一步评估了接种疫苗后6个月的NAb滴度,并观察到接种疫苗患者的中和抗体滴度在此期间逐渐下降。此外,我们使用美国国家生物标准与控制研究所(NIBSC)提供的世界卫生组织(WHO)参考血浆将我们的测定校准为任意单位(IU/mL)。我们的生物传感器可在血清和血浆中提供高度特异性和灵敏度的结果,适用于分析、临床和护理点(POC)应用,因为样品周转时间快,平台具有成本效益。
The COVID-19 pandemic has highlighted the need to monitor important correlates of immunity on a population-wide level. To this end, we have developed a competitive assay to assess neutralizing antibody (NAb) titer on the giant magnetoresistive (GMR) biosensor platform. We compared the clinical performance of our biosensor with established techniques such as Ortho’s VITROS Anti-SARS-CoV-2 IgG Quantitative Antibody test. Results obtained between the VITROS test and the GMR assay showed correlation (r = −0.93). We then validated the assay with patient plasma samples that had been tested using focus reduction neutralization testing (FRNT). The results obtained from our GMR assay exhibit a previously identified trend of increased NAb titers 2 weeks post-vaccination. We further evaluated NAb titers 6 months post-vaccination and observed waning neutralizing antibody titers over that time in vaccinated patients. In addition, we calibrated our assay to an arbitrary unit (IU/mL) using World Health Organization (WHO) reference plasma provided by the National Institute of Biological Standards and Control (NIBSC). Our biosensor provides highly specific and sensitive results in serum and plasma with analytical, clinical, and point-of-care (POC) applications due to quick turnaround times on samples and the cost-effectiveness of the platform.
用于探测低亲和力蛋白 - 蛋白质相互作用的磁纳米传感器平台以及低亲和力PD-L1/PD-L2相互作用的鉴定。
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DOI: 10.1016/j.nano.2018.11.007
发表时间: 2019-02-01
影响因子: 5.4
作者:
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