抗人肺表面活性物质相关蛋白A单克隆抗体的制备及其特性的鉴定

目的 制备抗人肺表面活性物质相关蛋白A(SP-A)单克隆抗体并对其特性进行鉴定。方法 以自行制备的SP-A蛋白作为抗原免疫Balb／c小鼠，建立分泌抗人SP-A单抗的杂交瘤细胞株，诱发小鼠产生单抗腹水，用(NH4)2SO4盐析纯化腹水，用间接ELISA法测定单抗效价，用Westemblotting测定抗体特异性。结果 建立了3株能持续分泌抗SP-A单抗的杂交瘤细胞株，其中286杂交瘤细胞株抗体效价最高，其染色体数目均大于100条。间接ELISA法测定腹水和细胞培养上清效价，分别为l：50000和l：10000。用Westem blotting在SP-A蛋白泳道上相对分子质量3l000左右位置出现明显的一条染色条带。结论 自行制备的抗人SP-A单抗，其具有特异性强、效价高的特点。

Preparation and identification of monoclonal antibodies against human pulmonary surfactant-associated protein A]

OBJECTIVE: To prepare monoclonal antibody (mAb) against human pulmonary surfactant-associated protein A (SP-A) and evaluate its specificities. METHODS: The hybridoma cell line secreting SP-A mAb was established to induce the production of SP-A ascites fluid in BALB/c mice immunized with SP-A. The ascites fluid was then collected and purified through (NH4)2SO4 salting-out procedure, and the titer and specificity of the purified monoclonal anti-SP-A antibodies were determined by Western blotting and indirect enzyme-linked immunosorbent assay, respectively. RESULTS: Three hybridoma cell lines capable of specific antibody secretion were established, among which 2B6 produced the antibody of the highest titer, with the hybridoma cell chromosome exceeding 100. The antibody titers in the ascitic fluid and cell supernatant fluid were 1: 50,000 and 1: 10,000 respectively, and Western blotting displayed a reaction band representing a relative molecular mass of 31,000, which was produced by the monoclonal antibody in reaction to purified SP-A. CONCLUSION: The antibodies of high purity and specificity against human SP-A have been successfully prepared.