title: [Purification and characterization of corresponding antigen recognized by monoclonal antibody 183B2 against ovarian carcinoma].
abstract: OBJECTIVE
  To purify MAb183B2 corresponding antigen of ovarian carcinomas and study its physical and chemical characteristics.
  
  
  METHODS
  The strongest positive samples reacted with MAb183B2 were screened from ovarian cancer ascites with indirect enzyme linked immunosorbent assay (ELISA). Then the antigen was purified from ascitic fluid by affinity chromatography with MAb183B2. Nature of the purified antigen was examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and western blot and its reactivity was determined after treatment with NaIO4, trypsin, pronase, neuraminidase, deglycolipid mixture and heating. Two dimensional electrophoresis combined with western blot was then used to isolate and identify the antigen from ovarian cancer cell line SKOV3.
  
  
  RESULTS
  The reactivity of the antigen after treated by NaIO4, neuraminidase and deglycolipid mixture was still positive, while it was negative after treated by trypsin, pronase and heating. The antigen proved to be composed of two different subunits of 56,000 and 25,000 by SDS-PAGE, and MAb183B2 could blot the 56,000 band by western blot. The antigen from the SKOV3 cell line displayed microheterogeneity appearing as three spots over a pI range 5.3 approximately 5.8 at 56,000.
  
  
  CONCLUSIONS
  The epitope of 183B2-antigen is at its peptide core. The antigen belongs to the Ig super family and might be a new ovarian carcinoma associated antigen.
authors.affiliation: Department of Gynecological Oncology Center, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Hui-fang
authors.initials: HF
authors.lastname: Guo
authors.forename: Jie
authors.initials: J
authors.lastname: Feng
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Yao
authors.forename: Hong-yan
authors.initials: HY
authors.lastname: Cheng
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity / Q000276:immunology; D000951:Antigens, Neoplasm / Q000276:immunology / Q000302:isolation & purification*; D015153:Blotting, Western; D018284:Cystadenocarcinoma, Serous / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000939:Epitopes