The invention provides methods and compositions for exploiting the discovery that members of the small integrin-binding ligand, n-linked glycoproteins family termed SIBLINGS bind to complement Factor H, and moreover that SIBLINGS proteins, such as BSP, exist in relatively acidic forms. The methods provided can be used to detect SIBLINGS proteins in samples from subjects that are suspected of having tumors or abnormal bone turnover. The invention also provides methods of using SIBLINGS proteins to protect cells from complement mediated lysis. Finally, the discovery allows for the creation of specific binding agents that facilitate the detection of SIBLINGS proteins when they are associated with Factor H.
本发明提供了利用以下发现的方法和组合物:被称为 SIBLINGS 的小整合素结合
配体、n-连接糖蛋白家族的成员与补体因子 H 结合,而且 SIBLINGS 蛋白,如
BSP,以相对酸性的形式存在。本发明提供的方法可用于检测怀疑患有肿瘤或骨质异常的受试者样本中的 SIBLINGS 蛋白。本发明还提供了使用 SIBLINGS 蛋白保护细胞免受补体介导的裂解的方法。最后,本发明还提供了特异性结合剂,当 SIBLINGS 蛋白与 H 因子结合时,这种结合剂有助于检测 SIBLINGS 蛋白。