Preparation of anti-NYD-SP8 rabbit polyclonal antibody and its application in the analysis of NYD-SP8 expression in nasopharyngeal carcinoma cell lines and clinical tissues.

AIMS AND BACKGROUND NYD-SP8 is a recently identified protein, the biological characteristics of which are still unclear. The aim of this study was to prepare an anti-NYD-SP8 rabbit polyclonal antibody and investigate the expression of NYD-SP8 in human nasopharyngeal carcinoma cell lines and nasopharyngeal carcinoma tissues. METHODS The anti-NYD-SP8 rabbit polyclonal antibody was prepared and ELISA was performed to assess the antibody titer. With this antibody, the NYD-SP8 expression in four nasopharyngeal carcinoma cell lines, CNE1, CNE2, 5-8F and 6-10B, was examined by Western blot and its expression in clinical tissues was also assessed by immunohistochemistry. RESULTS The anti-NYD-SP8 rabbit polyclonal antibody with a high titer was successfully prepared. Western blot showed higher NYD-SP8 expression in CNE2 and 6-10B cells and lower expression in CNE1 and 5-8F cells. Immunohistochemistry demonstrated overexpression of NYD-SP8 in nasopharyngeal carcinoma tissue while the expression in normal nasopharyngeal tissue was negligible. CONCLUSIONS Our anti-NYD-SP8 rabbit polyclonal antibody can be used both for Western blot and immunohistochemistry, and can be a valuable tool to investigate the function and distribution of NYD-SP8. The different NYD-SP8 expression in various nasopharyngeal carcinoma cell lines indicated its complicated functions at different biological stages. The overexpression of NYD-SP8 in clinical nasopharyngeal carcinoma tissue indicated that it could play an important role in nasopharyngeal carcinoma carcinogenesis.