產品概述
人VEGF(Vascular endothelial growth factor)基因編碼8個外顯子。由于不同剪切形式,產生至少有 4種異構體(VEGF121,VEGF165,VEGF189與VEGF206)。VEGF是一種高度保守的蛋白質,在不同的物種中,都有交叉活力。在人、大鼠或牛中,VEGF有84-94%的序列同源性。在體外,VEGF 是一種具有重要作用的內皮細胞有絲分裂原。在體外培養內皮細胞時,VEGF能激活磷酸脂酶C,誘導胞質內的自由Ca2+濃度增加。VEGF對單核細胞和造骨細胞也是化學趨化因子。在體內,VEGF能誘導血管生成和增加血管滲透性。基于這些體外與體內的活性,VEGF被認為在傷口愈合、胚胎發育、固體瘤的生長與轉移等過程有重要作用。
產品原理
本實驗采用雙抗體夾心ELISA法。抗人VEGF單抗包被于酶標板上,標本和標準品中的VEGF會與單抗結合,游離的成分被洗去形成免疫復合物;加入生物素化的抗人VEGF抗體,生物素化抗人VEGF抗體與酶標板上結合的標準品或樣本中的VEGF結合而形成免疫復合物,游離的成分被洗去;加入辣根過氧化物酶標記的親合素,親合素與生物素特異性結合,游離的成分被洗去。加入顯色底物(顯色劑),若反應孔中有VEGF,辣根過氧化物酶會使無色的顯色劑變藍,加終止液變黃。在450nm處測OD值, VEGF濃度與OD450值之間呈正相關,可通過繪制標準曲線求出標本中VEGF濃度。
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