Abstract:
:Two murine monoclonal antibodies, 2H6G5 (IgM) and 4A9E10 (IgG3), were obtained by using either cultured human hepatocellular carcinoma cells (PLC/PRF/5) or the acidic glycolipid mixture prepared from the same cells as immunogens. The antigen in PLC/PRF/5 cell membranes recognized by both antibodies was identified as a disulfated acidic glycolipid, GgOse4Cer-II3IV3-bis-sulfate (SB1a). Both antibodies reacted specifically with SB1a, and no significant reactivity was noted with other sulfated glycolipids or gangliosides except that the antibody 2H6G5 showed a weak cross-reactivity with LacCer-II3-sulfate (SM3), another sulfated glycolipid which partly shares the same carbohydrate structure as SB1a. The SB1a antigen is a relatively minor glycolipid in PLC/PRF/5 cells, but it was strongly expressed at the surface of PLC/PRF/5 cells as ascertained by cytofluorometry using both antibodies. A significant amount of SB1a antigen was present in 3 of the acidic glycolipid fractions isolated from 15 human hepatocellular carcinoma tissues as well as in the acidic glycolipid fraction prepared from PLC/PRF/5 cells, while all the acidic glycolipid fractions prepared from cirrhotic livers and a normal liver were essentially negative for SB1a, as ascertained by both solid phase enzyme immunoassay and the thin-layer chromatography-immunostaining method. These results strongly suggest that the SB1a antigen as defined by these new monoclonal antibodies is associated with human hepatocellular carcinoma.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Hiraiwa N,Iida N,Ishizuka I,Itai S,Shigeta K,Kannagi R,Fukuda Y,Imura Hsubject
Has Abstractpub_date
1988-12-01 00:00:00pages
6769-74issue
23eissn
0008-5472issn
1538-7445journal_volume
48pub_type
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