促甲状腺激素受体抗体放射受体分析法的建立及其临床应用

用0.5％ Triton X-100一次增溶猪甲状腺细胞膜,用固相Iodogen法标记bTSH再经受体亲合纯化获得了高比生物活性的可溶性TSH受体和~(125)I-bTSH,建立了TRAb放射受体分析法。制备的TSH受体和~(125)I-bTSH的结合可被非标记bTSH和Graves病患者血清中的TRAb呈剂量依赖性抑制。TRAb平均抑制率分别为15.4％和90.6％时,批间变异系数相应为12.6％和3.1％。试验和临床应用结果表明,本方法灵敏度高、特异性强、重复性好,且操作简便、快速,适于临床常规应用。

A RADIORECEPTOR ASSAY FOR HUMAN TSH RECEPTOR ANTIBODIES AND ITS CLINICAL APPLICATIONS

A radioreceptor assay for TRAb was described in which soluble TSH receptors obtained by solubilizing porcine thyroid membranes using 0.5% Triton X-100 and 125I-bTSH prepared by iodogen method and receptor-purification were used. The binding of 125I-bTSH to TSH receptors was inhibited by unlabeled bTSH and sera of patients with uncon-trolled Graves' disease (GD) in a dose-dependent manner. The assay was sensitive, specific, rapid and reproducible with interassay CV of 12.6% and 3.1% at mean inhibition values of 15.4% and 90.6% .respectively, being suitable for a clioical routine test. Of 133 patients with uncontrolled GD, TRAb was positive in 94.7%, while the absence of detectable TRAb was found in 6 patients with hyperthyroidism but not due to GD. This indicated TRAb measurement has important value in etiology and diagnosis of hyperthyroidism duc to GD.