產品概述
白介素12(IL-12),也稱為自然殺傷細胞刺激因子(NKSF)或毒性淋巴細胞成熟因子(CLMF),是一種多功能細胞因子,在EBV感染的RPMI-8866細胞培養(yǎng)液中被鑒定出的。IL-12是分子量為75kD的異二聚體組成的糖蛋白,其中,較小的亞單位(p35)與IL-6、G-CSF同源,而大亞單位(p40)被證明與可溶性IL-6受體有同源性。這提示IL-12可能是細胞因子與IL-6可溶性受體的復合物進化而來的。IL-12具有明顯的種屬特異性,人的IL-12與小鼠系統(tǒng)具有很少的交叉反應。巨噬細胞與B淋巴細胞表達的IL-12對T細胞與自然殺傷細胞有多種生理效應。包括誘導休止期與激活的T細胞、NK細胞表達IFN-γ與TNF,與其他IFN-γ協(xié)同誘導劑在轉錄與翻譯水平上誘導IFN-γ表達,增強NK細胞與T細胞的殺傷能力,誘導被激活的T細胞與NK細胞分裂增殖。
產品原理
本實驗采用雙抗體夾心ELISA法??勾笫驣L-12p70單抗包被于酶標板上,同時加入標本、標準品和生物素化的抗大鼠IL-12p70抗體,標本、標準品中的IL-12p70會與加入于孔中的生物素化的抗大鼠IL-12p70抗體及包被于酶標板上的單抗結合,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IL-12p70,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,IL-12p70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IL-12p70濃度。
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