CCLM:P35和P22弓形虫抗原简短区域用于诊断妊娠期获得性弓形体病

2017-05-15 MedSci MedSci原创

P35和P22弓形虫蛋白在早期感染阶段被特异性IgG识别,使其成为急性弓形虫病妊娠控制的理想选择。研究人员已经研究了两种蛋白质以区分急性和慢性弓形虫病。然而,结果几乎不具有可比性,因为不同的蛋白质获得程序导致不同的抗原产生,所使用的参考板不具最佳代表性,并且不能进行亲合力测试或仅能勉强进行。

近日,国际杂志Clinical Chemistry and Laboratory Medicine在线发表一项关于P35和P22弓形虫抗原简短区域用于诊断妊娠期获得性弓形体病的研究。

P35和P22弓形虫蛋白在早期感染阶段被特异性IgG识别,使其成为急性弓形虫病妊娠控制的理想选择。研究人员已经研究了两种蛋白质以区分急性和慢性弓形虫病。然而,结果几乎不具有可比性,因为不同的蛋白质获得程序导致不同的抗原产生,所使用的参考板不具最佳代表性,并且不能进行亲合力测试或仅能勉强进行。

研究利用生物信息学预测抗原表位密度最高的P35和P22区,并在pET32 / BL21DE3替代表达系统中表达,获得可溶性蛋白rP35a和rP22a。使用孕妇血清样品评估其诊断性能,代表为:未感染,NI(IgG-,IgM-),典型慢性,TC(IgM-,IgG +),推测为急性A(IgG +,IgM +,低亲和力IgG )和最近慢性的RC(IgG +,IgM +,高亲合力IgG)。

对区分A和RC,rP35a表现优于rP22a,曲线下面积(AUC)分别为0.911和0.818。然而,它们对区分A与TC + RC(AUC分别为0.915和0.907)有类似的表现。 rP35a和rP22a通过亲合力ELISA区分A与RC,AUC值分别为0.974和0.921。串联分析的间接ELISA和亲合力ELISA结果与使用商业试剂盒获得的结果一致。

rP35a和rP22a的特征表明,通过补充使用,它们可以替代寄生虫溶解产物用于弓形虫感染筛查和急性弓形体病诊断。研究人员建议通过纵向研究进行验证,并利用此获得一个可靠的弓形体病妊娠控制手段。

原始出处:

Juan G. Costa, Leandro E. Peretti, Valeria S. García. et.al. P35 and P22 Toxoplasma gondii antigens abbreviate regions to diagnose acquired toxoplasmosis during pregnancy: toward single-sample assays.

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