Abstract |
Erythrocyte polyagglutination antigens T and Tn are truncated O- glycan chains that are also carcinoma-associated antigens. We investigated whether Tk polyagglutination antigen could similarly be a carcinoma-associated marker and a target of immunotherapy. Monoclonal antibody LM389 was raised against Tk erythrocytes and tested by immunohistochemistry. LM389 strongly reacted with 48% human colorectal carcinomas. Labeling of normal tissues was visible on epithelial cells, mainly digestive, but was confined at a supranuclear level. Expression of the antigen on cloned human carcinoma cells correlated with sialosyl-Tn expression. O-Sialoglycoprotein endopeptidase treatment revealed that on carcinomas and cell lines, the epitope was present on O- glycans. Antibody specificity was determined using synthetic carbohydrates. Direct binding and inhibition studies indicated that LM389 best ligands were terminated by two branched N-acetylglucosamine units. Screening of murine cellular cell lines with LM389 allowed development of an experimental model with Tk-positive and -negative cells in syngeneic BDIX rats. Vaccination of rats with Tk erythrocytes provided a protection against growth of rat Tk-positive, but not of Tk-negative, tumor cells in association with the development of antibodies. Taken together, the results indicate that Tk polyagglutination antigen is a new colorectal carcinoma-associated antigen, absent from the normal cell surface, resulting from alteration of O- glycans biosynthesis and with potential as a target of immunotherapy.
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Authors | M Meichenin, J Rocher, O Galanina, N Bovin, N Nifantev, A Sherman, E Cassagnau, M F Heymann, J Bara, R H Fraser, J Le Pendu |
Journal | Cancer research
(Cancer Res)
Vol. 60
Issue 19
Pg. 5499-507
(Oct 01 2000)
ISSN: 0008-5472 [Print] United States |
PMID | 11034094
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antibodies, Monoclonal
- Antigens, Tumor-Associated, Carbohydrate
- Epitopes
- Polysaccharides
- Glycoside Hydrolases
- keratan-sulfate endo-1,4-beta-galactosidase
- beta-Galactosidase
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Topics |
- Adenocarcinoma
(immunology, metabolism, prevention & control)
- Animals
- Antibodies, Monoclonal
(immunology)
- Antibody Specificity
- Antigens, Tumor-Associated, Carbohydrate
(biosynthesis, immunology, metabolism)
- Carbohydrate Sequence
- Colorectal Neoplasms
(immunology, metabolism, prevention & control)
- Epitopes
(immunology)
- Erythrocyte Aggregation
(immunology)
- Erythrocytes
(immunology)
- Glycoside Hydrolases
- Glycosylation
- Hemagglutination
(immunology)
- Humans
- Immunization, Passive
- Immunohistochemistry
- Mice
- Mice, Inbred BALB C
- Molecular Sequence Data
- Polysaccharides
(immunology)
- Rats
- Rats, Inbred Strains
- Tumor Cells, Cultured
- beta-Galactosidase
(immunology, pharmacology)
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