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抗瓜氨酸蛋白抗体 (ACPA) 是针对瓜氨酸化肽和蛋白质的自身抗体(针对个体自身蛋白质的抗体)。它们存在于大多数类风湿性关节炎患者中。在临床上,环瓜氨酸肽 (CCP) 经常用于检测患者血清或血浆中的这些抗体(当时称为抗瓜氨酸肽抗体)。在炎症过程中,精氨酸氨基酸残基可以通过称为瓜氨酸化的过程在波形蛋白等蛋白质中酶促转化为瓜氨酸残基。如果它们的形状发生显着变化,这些蛋白质可能会被免疫系统视为抗原,从而产生免疫反应。ACPA 已被证明是强大的生物标志物,可以在非常早期的阶段做出类风湿性关节炎 (RA) 的诊断。 本试剂盒采用间接法酶联免疫吸附试验(ELISA)。往预先包被有小鼠抗环瓜氨酸肽抗体(CCP-Ab)抗原的微孔中,依次加入样本、阳性对照、阴性对照、HRP标记的二抗,中间经过温育和洗涤,用底物TMB显色,TMB在过氧化物酶(HRP)的催化下转化成蓝色,并在酸的作用下转化成最终的黄色。颜色的深浅和样本中的小鼠抗环瓜氨酸肽抗体(CCP-Ab)呈正相关。用酶标仪在450nm波长下测定吸光度(OD值),判断样本阴阳性。
This kit employs the indirect enzyme-linked immunosorbent assay (ELISA) principle. Microplate wells are pre-coated with Mouse CCP-Ab antigen. The sample or standard is first added to the wells, followed by an HRP (horseradish peroxidase)-labeled secondary antibody. The procedure involves incubation and wash steps between each addition. TMB substrate is then added for color development. Under the catalysis of the peroxidase (HRP), TMB is converted into a blue product, which subsequently turns into a final stable yellow color upon the addition of an acid stop solution. The intensity of the yellow color is directly proportional to the concentration of Mouse CCP-Ab in the sample. The optical density (OD) is measured at a wavelength of 450 nm using a microplate reader, and the concentration of the target analyte in the sample is calculated based on the standard curve.