产品概述
人VEGF(Vascular endothelial growth factor)基因编码8个外显子。由于不同剪切形式,产生至少有 4种异构体(VEGF121,VEGF165,VEGF189与VEGF206)。VEGF是一种高度保守的蛋白质,在不同的物种中,都有交叉活力。在人、大鼠或牛中,VEGF有84-94%的序列同源性。在体外,VEGF 是一种具有重要作用的内皮细胞有丝分裂原。在体外培养内皮细胞时,VEGF能激活磷酸脂酶C,诱导胞质内的自由Ca2+浓度增加。VEGF对单核细胞和造骨细胞也是化学趋化因子。在体内,VEGF能诱导血管生成和增加血管渗透性。基于这些体外与体内的活性,VEGF被认为在伤口愈合、胚胎发育、固体瘤的生长与转移等过程有重要作用。
产品原理
本实验采用双抗体夹心ELISA法。抗人VEGF单抗包被于酶标板上,标本和标准品中的VEGF会与单抗结合,游离的成分被洗去形成免疫复合物;加入生物素化的抗人VEGF抗体,生物素化抗人VEGF抗体与酶标板上结合的标准品或样本中的VEGF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VEGF,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, VEGF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VEGF浓度。
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