Abstract |
Antibody-dependent cell-mediated cytotoxicity (ADCC), which is largely mediated by natural killer (NK) cells, is thought to play an important role in the efficacy of rituximab, an anti-CD20 monoclonal antibody (mAb) used to treat patients with B-cell lymphomas. CD137 is a costimulatory molecule expressed on a variety of immune cells after activation, including NK cells. In the present study, we show that an anti-CD137 agonistic mAb enhances the antilymphoma activity of rituximab by enhancing ADCC. Human NK cells up-regulate CD137 after encountering rituximab-coated tumor B cells, and subsequent stimulation of these NK cells with anti-CD137 mAb enhances rituximab-dependent cytotoxicity against the lymphoma cells. In a syngeneic murine lymphoma model and in a xenotransplanted human lymphoma model, sequential administration of anti-CD20 mAb followed by anti-CD137 mAb had potent antilymphoma activity in vivo. These results support a novel, sequential antibody approach against B-cell malignancies by targeting first the tumor and then the host immune system.
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Authors | Holbrook E Kohrt, Roch Houot, Matthew J Goldstein, Kipp Weiskopf, Ash A Alizadeh, Josh Brody, Antonia Müller, Russell Pachynski, Debra Czerwinski, Steven Coutre, Mark P Chao, Lieping Chen, Thomas F Tedder, Ronald Levy |
Journal | Blood
(Blood)
Vol. 117
Issue 8
Pg. 2423-32
(Feb 24 2011)
ISSN: 1528-0020 [Electronic] United States |
PMID | 21193697
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Retracted Publication)
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Chemical References |
- Antibodies, Monoclonal
- Antibodies, Monoclonal, Murine-Derived
- Antigens, CD20
- Tumor Necrosis Factor Receptor Superfamily, Member 9
- Rituximab
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Topics |
- Animals
- Antibodies, Monoclonal
(pharmacology, therapeutic use)
- Antibodies, Monoclonal, Murine-Derived
(pharmacology)
- Antibody-Dependent Cell Cytotoxicity
- Antigens, CD20
(immunology)
- Drug Synergism
- Humans
- Rituximab
- Tumor Cells, Cultured
- Tumor Necrosis Factor Receptor Superfamily, Member 9
(genetics, immunology)
- Xenograft Model Antitumor Assays
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