产品概述
白细胞介素-4是一种多效性的细胞因子,它在不同种类的细胞类型中有多种免疫反应调节活性。IL-4是一种用于调节免疫球蛋白同型转换,特别是IgG1和IgE的B细胞激活或活化因子。它抑制IFN-γ产生CD4+T细胞并且调控T细胞前体向Th2亚群的分化,调节过敏和体液免疫反应。TNF-α,IL-4协同诱导VCAM-1在血管内皮细胞和平滑肌细胞的表达,致使嗜曙红细胞和淋巴细胞选择性诱发这个位置的发炎。IL-4下游调控炎症介质,如IL-1、TNF-α、和PGE2在单核细胞中产生。IL-4同样被证实在体内或体外有抗肿瘤活性作用。已经证明能分泌IL-4的细胞包括嗜碱细胞,CD8+T细胞,记忆CD4+ 细胞,前体TH2细胞,柱状细胞,嗜曙红细胞,病毒活性的树枝状细胞。鼠的IL-4cDNA序列预测是一个147个氨基酸残基的前体蛋白包括一个24个氨基酸残基的信号肽序列,通过剪切产生了123个氨基酸残基的成熟蛋白,包括4个潜在的N端的糖基化位点和7个半胱氨酸残基,这7个中的6个参与形成三个分子内的有活性的二硫键连接。成熟大鼠的IL-4氨基酸序列与小鼠和人IL-4氨基酸序列分别有60%和44%的同源性。
产品原理
本实验采用双抗体夹心ELISA法。抗大鼠IL-4单抗包被于酶标板上,标本和标准品中的IL-4会与单抗结合形成免疫复合物,游离的成分被洗去;加入生物素化的抗大鼠IL-4抗体,生物素化抗大鼠IL-4抗体与酶标板结合的标准品或样本中的大鼠IL-4结合而形成免疫复合物,游离的成分被洗去;加入辣根过氧化物酶标记的亲合素,亲合素与生物素特异性结合,游离的成分被洗去。加入显色底物(显色剂),若反应孔中有IL-4,辣根过氧化物酶会使无色的显色剂变蓝,加终止液变黄。在450nm处测OD值,IL-4浓度与OD450值之间呈正相关,可通过绘制标准曲线求出标本中IL-4浓度。
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