Synergetic effect of interleukin-2 and cellular cytotoxicity against a novel tumor-associated carbohydrate antigen Le(a)/Le(a) (dimeric Le(a)) mediated by monoclonal antibody NCC-ST-421 in adoptive immunization using SCID mice. 1993

M Watanabe, and T Kubota, and M Kitajima, and S Hakomori
Biomembrane Institute, Seattle, WA 98119.

The murine IgG3 monoclonal antibody NCC-ST-421, raised against a human gastric cancer, shows strong reactivity with dimeric Le(a) (Le(a)/Le(a); V4FucIII4FucLc6Cer) expressed on gastrointestinal cancer cells. ST-421 reacted minimally with non-dimeric or simple Le(a) expressed on normal tissues. ST-421 is capable of mediating both antibody-dependent cellular cytotoxicity (ADCC) with human peripheral blood lymphocytes, and complement-dependent cytotoxicity with human complement. Interleukin-2 (IL-2) modulates the function of immunocytes, in particular inducing lymphokine-activated killer (LAK) cell activity and enhancing ADCC. We therefore employed combination immunotherapy with IL-2, LAK, and ST-421-induced ADCC in vitro and in mice with severe combined immunodeficiency (SCID), using target tumor cells expressing Le(a)/Le(a) antigen. ADCC against human colon cancer cell lines in vitro was enhanced three to four times after preincubation with IL-2. Addition of IL-2 reduced the amount of ST-421 required for efficient ADCC 10- to 100-fold. ADCC was activated by IL-2 earlier (1 day) than the generation of LAK cells (3-4 days), and at lower concentration of IL-2. These effects were specific for ST-421, as demonstrated by experiments with irrelevant antibody or irrelevant target cells. An anti-(Fc receptor) antibody blocked the ADCC but not the LAK activity in vitro. The enhancement of ADCC by IL-2 may be caused by activation of effector cells expressing Fc receptors. In vivo experiments using SCID mice inoculated with human colon cancer showed a significant tumor-growth-suppressive effect after combined therapy using human peripheral blood lymphocytes, LAK, IL-2, and ST-421. In summary, adoptive immunization with human lymphocytes activated by IL-2 and ST-421 effectively suppressed growth of gastrointestinal cancer cells expressing Le(a)/Le(a).

UI MeSH Term Description Entries
D007376 Interleukin-2 A soluble substance elaborated by antigen- or mitogen-stimulated T-LYMPHOCYTES which induces DNA synthesis in naive lymphocytes. IL-2,Lymphocyte Mitogenic Factor,T-Cell Growth Factor,TCGF,IL2,Interleukin II,Interleukine 2,RU 49637,RU-49637,Ro-23-6019,Ro-236019,T-Cell Stimulating Factor,Thymocyte Stimulating Factor,Interleukin 2,Mitogenic Factor, Lymphocyte,RU49637,Ro 23 6019,Ro 236019,Ro236019,T Cell Growth Factor,T Cell Stimulating Factor
D009368 Neoplasm Transplantation Experimental transplantation of neoplasms in laboratory animals for research purposes. Transplantation, Neoplasm,Neoplasm Transplantations,Transplantations, Neoplasm
D003110 Colonic Neoplasms Tumors or cancer of the COLON. Cancer of Colon,Colon Adenocarcinoma,Colon Cancer,Cancer of the Colon,Colon Neoplasms,Colonic Cancer,Neoplasms, Colonic,Adenocarcinoma, Colon,Adenocarcinomas, Colon,Cancer, Colon,Cancer, Colonic,Cancers, Colon,Cancers, Colonic,Colon Adenocarcinomas,Colon Cancers,Colon Neoplasm,Colonic Cancers,Colonic Neoplasm,Neoplasm, Colon,Neoplasm, Colonic,Neoplasms, Colon
D003131 Combined Modality Therapy The treatment of a disease or condition by several different means simultaneously or sequentially. Chemoimmunotherapy, RADIOIMMUNOTHERAPY, chemoradiotherapy, cryochemotherapy, and SALVAGE THERAPY are seen most frequently, but their combinations with each other and surgery are also used. Multimodal Treatment,Therapy, Combined Modality,Combined Modality Therapies,Modality Therapies, Combined,Modality Therapy, Combined,Multimodal Treatments,Therapies, Combined Modality,Treatment, Multimodal,Treatments, Multimodal
D005732 Gangliosides A subclass of ACIDIC GLYCOSPHINGOLIPIDS. They contain one or more sialic acid (N-ACETYLNEURAMINIC ACID) residues. Using the Svennerholm system of abbrevations, gangliosides are designated G for ganglioside, plus subscript M, D, or T for mono-, di-, or trisialo, respectively, the subscript letter being followed by a subscript arabic numeral to indicated sequence of migration in thin-layer chromatograms. (From Oxford Dictionary of Biochemistry and Molecular Biology, 1997) Ganglioside,Sialoglycosphingolipids
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000911 Antibodies, Monoclonal Antibodies produced by a single clone of cells. Monoclonal Antibodies,Monoclonal Antibody,Antibody, Monoclonal
D000920 Antibody-Dependent Cell Cytotoxicity The phenomenon of antibody-mediated target cell destruction by non-sensitized effector cells. The identity of the target cell varies, but it must possess surface IMMUNOGLOBULIN G whose Fc portion is intact. The effector cell is a "killer" cell possessing Fc receptors. It may be a lymphocyte lacking conventional B- or T-cell markers, or a monocyte, macrophage, or polynuclear leukocyte, depending on the identity of the target cell. The reaction is complement-independent. ADCC,Cytotoxicity, Antibody-Dependent Cell,Cell Cytoxicity, Antibody-Dependent,Antibody Dependent Cell Cytotoxicity,Antibody-Dependent Cell Cytotoxicities,Antibody-Dependent Cell Cytoxicities,Antibody-Dependent Cell Cytoxicity,Cell Cytotoxicities, Antibody-Dependent,Cell Cytotoxicity, Antibody-Dependent,Cell Cytoxicities, Antibody-Dependent,Cell Cytoxicity, Antibody Dependent,Cytotoxicities, Antibody-Dependent Cell,Cytotoxicity, Antibody Dependent Cell,Cytoxicities, Antibody-Dependent Cell,Cytoxicity, Antibody-Dependent Cell
D015295 Antigens, Tumor-Associated, Carbohydrate Carbohydrate antigens expressed by malignant tissue. They are useful as tumor markers and are measured in the serum by means of a radioimmunoassay employing monoclonal antibodies. Antigens, Carbohydrate, Tumor-Associated,CA Antigens,Cancer-Associated Carbohydrate Antigens,Carbohydrate Antigens, Tumor-Associated,Tumor-Associated Carbohydrate Antigens,Antigen, Carcinoma-Associated,CA Antigen,CA(Oxford) Antigen,Carcinoma-Associated Antigen,Epitectin,Antigen, CA,Antigen, Carcinoma Associated,Antigens, CA,Antigens, Cancer-Associated Carbohydrate,Antigens, Tumor-Associated Carbohydrate,Cancer Associated Carbohydrate Antigens,Carbohydrate Antigens, Cancer-Associated,Carbohydrate Antigens, Tumor Associated,Carcinoma Associated Antigen,Tumor Associated Carbohydrate Antigens

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