[A new monoclonal antibody (SH-9) recognizes the low molecular mass of ovarian cancer antigen CA125].
The SHIN-3 cell line producing CA125 was established from an ovarian cancer patient. Using the SHIN-3 cell line, we found that the low-molecular-mass antigen (about 50 KDa) might be the main antigenic determinant in CA125-immunoreactive species. A new monoclonal antibody to this low-molecular-mass was raised to examine a new cancer associated antigen by a hybridoma technique. Using enzyme linked immuno sorbent assay, ten clones were selected from among 398 clones. Two clones were IgG1 and eight were IgM. By immunostaining (ABC assay), a new antibody (named SH-9) reacted with normal pulmonary bronchus and uterine cervical glands. No positivity, however, was observed in endometriosis (adenomyosis). In tumorous lesions of ovary, SH-9 antibody reacted specifically with mucinous cystadenoma-benign, borderline or malignant. However, no positivity was found in serous cystadenocarcinoma. In any other carcinomas, only lung cancer (adenocarcinoma, squamous cell carcinoma) showed a clear positivity. Immuno blotting analysis showed that SH-9 antibody recognized a low molecular mass. Therefore, SH-9 is seen to be an extremely unique antibody when compared with OC125 biochemically and histochemically.
Maeda
H
H
Second Department of Pathology, Nara Medical University.
Imai
S
S
Morimoto
J
J
Kiyozuka
Y
Y
Noda
T
T
Haga
S
S
Hiroishi
S
S
D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology; D000937:Antigen-Antibody Reactions; D015295:Antigens, Tumor-Associated, Carbohydrate / Q000276:immunology*; D003537:Cystadenoma / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000276:immunology; D008970:Molecular Weight; D010051:Ovarian Neoplasms / Q000276:immunology*
D000911:Antibodies, Monoclonal; D015295:Antigens, Tumor-Associated, Carbohydrate; D000939:Epitopes