title: HMOCC-1, a human monoclonal antibody that inhibits adhesion of ovarian cancer cells to human mesothelial cells.
abstract: OBJECTIVE
  Ovarian carcinoma is one of the most common gynecologic cancers and shows the worst prognosis since current therapies are not sufficiently effective at achieving and maintaining remission. To develop new treatment, a monoclonal antibody recognizing human ovarian cancer cells was raised in KM mice.
  
  
  METHODS
  A human monoclonal antibody targeting RMG-I (an ovarian carcinoma cell line) was established with hybridomas of myeloma cells and spleen cells from KM mice. The immunohistochemical reactivity of various types of ovarian carcinoma and other tumors was investigated. RMG-I cells were treated with N-glycosidase F, NaOH, H(2)SO(4), and Gal NAC-alpha-benzyl to investigate the target antigens by Western blotting. The effect of HMOCC-1 on adhesion of RMG-I cells to cultured human mesothelial cells was also investigated.
  
  
  RESULTS
  The new human monoclonal antibody, HMOCC-1, was an immunoglobulin M that recognized ovarian epithelial carcinoma. Immunohistochemical staining revealed HMOCC-1 positivity in 83.2% of ovarian carcinomas. The antigen recognized by HMOCC-1 was apparently a glycoprotein since Western blotting yielded a broad band (34.8-49.1 kDa). HMOCC-1 inhibited the attachment of RMG-I cells to monolayers of cultured peritoneal mesothelial cells in a concentration-dependent manner.
  
  
  CONCLUSIONS
  This new human monoclonal antibody reacted with most ovarian cancers tested. The antigen recognized by HMOCC-1 is a glycoprotein located on the cell membrane. Inhibition of the attachment of RMG-1 cells to mesothelial cells by HMOCC-1 suggests a potential role for this antibody in the treatment of ovarian cancer.
authors.affiliation: Department of Obstetrics and Gynecology, School of Medicine, Keio University, Tokyo, Japan. naos@sc.itc.keio.ac.jp <naos@sc.itc.keio.ac.jp>
authors.forename: Nao
authors.initials: N
authors.lastname: Suzuki
authors.forename: Daisuke
authors.initials: D
authors.lastname: Aoki
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Tamada
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Susumu
authors.forename: Kimiko
authors.initials: K
authors.lastname: Orikawa
authors.forename: Katsumi
authors.initials: K
authors.lastname: Tsukazaki
authors.forename: Motoko
authors.initials: M
authors.lastname: Sakayori
authors.forename: Atsushi
authors.initials: A
authors.lastname: Suzuki
authors.forename: Takeshi
authors.initials: T
authors.lastname: Fukuchi
authors.forename: Makio
authors.initials: M
authors.lastname: Mukai
authors.forename: Kyoko
authors.initials: K
authors.lastname: Kojima-Aikawa
authors.forename: Isao
authors.initials: I
authors.lastname: Ishida
authors.forename: Shiro
authors.initials: S
authors.lastname: Nozawa
mesh_terms: D018262:Adenocarcinoma, Clear Cell / Q000276:immunology* / Q000473:pathology*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000276:immunology; D015153:Blotting, Western; D002448:Cell Adhesion / Q000276:immunology; D045744:Cell Line, Tumor; D004847:Epithelial Cells / Q000166:cytology / Q000276:immunology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010051:Ovarian Neoplasms / Q000276:immunology* / Q000473:pathology*; D010529:Peritoneal Cavity / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm