【摘要】 缺氧诱导因子1α(Hypoxia inducible factor 1α,HIF-1α)参与低氧微环境相关疾病的发生等过程，具有控制肿瘤生长和发展的功能。黑色素瘤是一种发生于人和动物恶性程度较高的肿瘤。为探明HIF-1α纳米抗体对黑色素瘤的影响，研究利用前期保存的羊驼源黑色素瘤细胞噬菌体文库筛选HIF-1α纳米抗体，经原核表达与纯化后，通过Western Blot和免疫组织化学验证HIF-1α纳米抗体与抗原的结合性；分别通过CCK-8法、划痕试验以及Western Blot法检测其对B16黑素瘤细胞的增殖和迁移能力及其相关分子表达的影响。结果表明，经表达和纯化获得的HIF-1α纳米抗体分子质量约为16 ku，没有跨膜结构，具有亲水性。通过Western Blot和免疫组织化学验证了其具有良好的抗原结合性。在增殖试验和划痕试验中，与对照组相比，HIF-1α纳米抗体抑制了B16细胞的增殖和迁移，下调了靶基因VEGF的表达，并使细胞增殖和迁移相关蛋白Ras、ERK、RAC和RAF的表达量下调。预测HIF-1α纳米抗体进入B16细胞内，与抗原结合，通过下游靶基因VEGF下调RAs、ERK、RAC、RAF的表达，从而对细胞增殖和迁移起抑制作用，可作为黑色素瘤治疗的新靶点。更多还原

【Abstract】 The hypoxia inducible factor 1α(HIF-1α) is involved in the occurrence of diseases related to hypoxia microenvironment and has the function of controlling tumor growth and development. As we known, melanoma is a highly malignant tumor occurring in animals and humans. To explore the effect of HIF-1α nano-antibody on melanoma, in this study,the phage library of alpaca-drived melanoma cells previously preserved in our laboratory was used to screen HIF-1α nanoantibodies. After prokaryotic expression and purification, the binding of HIF-1α nano-antibody and its antigen was verified by Western blot and immunohistochemistry. The effects of HIF-1α nano-antibody on the proliferation and migration of B16melanoma cells and the expression of related molecules were detected by CCK-8, wound healing test, and Western blot methods. The results showed that HIF-1α nano-antibody obtained by expression and purification was hydrophilic protein without transmembrane structure and had a molecular weight of about 16 ku. Western blot and immunohistochemistry results showed that it had good antigenic binding. In the proliferation and wound healing experiments, HIF-1α nano-antibody inhibited the proliferation and migration of B16 cells, down-regulated the expression of target gene VEGF and the proliferation and migration related proteins Ras, ERK, RAC, and RAF, comparing with the control group. In Conclusion, it was predicted that HIF-1αnano-antibody entered B16 cells and combined with antigens and down-regulated the expression of RAs, ERK, RAC, RAF through the downstream target gene VEGF, which inhibited cell proliferation and migration, and could be used as a new target for melanoma treatment.更多还原