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Document 0199
DOCN M9610199
TI Antibody-targeted superantigens are potent inducers of
tumor-infiltrating T lymphocytes in vivo.
DT 9601
AU Dohlsten M; Hansson J; Ohlsson L; Litton M; Kalland T; Pharmacia
Oncology Immunology, Lund, Sweden.
SO Proc Natl Acad Sci U S A. 1995 Oct 10;92(21):9791-5. Unique Identifier :
AIDSLINE MED/96003865
AB Recruitment of antigen-specific tumor-infiltrating lymphocytes (TILs) is
a major goal for immunotherapy of malignant tumours. We now describe
that T-cell-activating superantigens targeted to a tumor by monoclonal
antibodies induced large numbers of pseudospecific TILs and eradication
of micrometastases. As a model for tumor micrometastases, syngeneic B16
melanoma cells transfected with the human colon carcinoma antigen C215
were injected intravenously into C57BL/6 mice and therapy with an
anti-C215 Fab fragment-staphylococcal enterotoxin A (C215Fab-SEA) fusion
protein reacting with the C215 antigen was initiated when visible lung
metastases were established. More than 90% reduction of the number of
lung metastases was observed when mice carrying 5-day-old established
lung metastases were treated with C215Fab-SEA. The antitumor effect of
C215Fab-SEA was shown to be T-cell-dependent since no therapeutic effect
was seen in T-cell-deficient nude mice. Depletion of T-cell subsets by
injection of monoclonal antibody demonstrated that CD8+ cells were the
most prominent effector cells although some contribution from CD4+ cells
was also noted. C215Fab-SEA treatment induced massive tumor infiltration
of CD4+ and CD8+ T cells, while only scattered T cells were observed in
untreated tumors. SEA treatment alone induced a slight general
inflammatory response in the lung parenchyme, but no specific
accumulation of T cells was seen in the tumor. TILs induced by
C215Fab-SEA were mainly CD8+ but a substantial number of CD4+ cells were
also present. Immunohistochemical analysis showed strong production of
the tumoricidal cytokines tumor necrosis factor alpha and interferon
gamma in the tumor. Thus, the C215Fab-SEA fusion protein targets
effector T lymphocytes to established tumors in vivo and provokes a
strong local antitumor immune response.
DE Animal Antibodies, Monoclonal/THERAPEUTIC USE Antigens,
Neoplasm/IMMUNOLOGY Cytokines/METABOLISM CD4-Positive T-Lymphocytes
CD8-Positive T-Lymphocytes Enterotoxins/IMMUNOLOGY/*THERAPEUTIC USE
Immunoglobulins, Fab/IMMUNOLOGY/*THERAPEUTIC USE Lung
Neoplasms/SECONDARY Lymphocytes, Tumor-Infiltrating/*IMMUNOLOGY
Melanoma, Experimental/*DRUG THERAPY/IMMUNOLOGY/PATHOLOGY Mice Mice,
Inbred C57BL Mice, Nude Staphylococcus aureus/*IMMUNOLOGY
Superantigens/IMMUNOLOGY/*THERAPEUTIC USE JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).