CLIN CHEM:通过LC-MS/MS解决假免疫力浊度IgG亚类的测量差异

2018-04-04 MedSci MedSci原创

结合位点免疫比浊法(IN)IgG亚类试剂(IgG1,IgG2,IgG3,IgG,BSIN)用于评估免疫缺陷和IgG4相关疾病(IgG4-RD)。在实验室中,我们在IgG4增加的患者中发现了可疑的分析错误:单个IgG亚类的总和实际上大于测量的总IgG浓度(与具有正常IgG4的样品不同),并且IgG4浓度总是低于IgG2浓度。 因此我们开发了胰蛋白酶消化LC-MS / MS方法来定量血清中的Ig

结合位点免疫比浊法(IN)IgG亚类试剂(IgG1,IgG2,IgG3,IgG,BSIN)用于评估免疫缺陷和IgG4相关疾病(IgG4-RD)。在实验室中,我们在IgG4增加的患者中发现了可疑的分析错误:单个IgG亚类的总和实际上大于测量的总IgG浓度(与具有正常IgG4的样品不同),并且IgG4浓度总是低于IgG2浓度。 因此我们开发了胰蛋白酶消化LC-MS / MS方法来定量血清中的IgG1,IgG2,IgG3和IgG4。通过LC-MS / MS对IgG4浓度<0.03 g / L至32 g / L范围内的样品进行重新分析,并且还通过Siemens IN(SIN)子类别测量重新分析了一个子集。结果显示,多变量线性回归分析确定了3个亚类测试,其中多个预测因子测量了亚类浓度。对于这3个亚类,主要预测因子(根据LC-MS / MS IgG亚类测量系数)BSIN IgG1 = 0.89·IgG1 + 0.4·IgG4; BSIN IgG2 = 0.94·IgG4 + 0.89·IgG2; 和SIN IgG2 = 0.72·IgG2 + 0.24·IgG4。  研究表明,所选

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