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Tumor Rejection by in Vivo Administration of Anti-CD25 (Interleukin-2 Receptor ) Monoclonal Antibody¹

Department of Parasitology and Immunology, Okayama University Medical School, Okayama 700-8558 [S. O., I. T., E. N.]; Department of Oncology, Nagasaki University School of Medicine, Nagasaki 852-8523 [S. O.]; Department of Immunopathology, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo 173-0015 [J. S., S. S.]; and Department of Biochemistry, Fukushima Medical College, Fukushima 960-1295 [T. F.], Japan

Immune regulation has been shown to be involved in the progressive growth of some murine tumors. In this study, we demonstrated that a single in vivo administration of an amount less than 0.125 mg of anti-CD25 interleukin 2 receptor monoclonal antibody (mAb; PC61) caused the regression of tumors that grew progressively in syngeneic mice. The tumors used were five leukemias, a myeloma, and two sarcomas derived from four different inbred mouse strains. Anti-CD25 mAb (PC61) showed an effect in six of the eight tumors. Administration of anti-CD25 mAb (PC61) caused a reduction in the number of CD4⁺CD25⁺ cells in the peripheral lymphoid tissues. The findings suggested that CD4⁺CD25⁺ immunoregulatory cells were involved in the growth of those tumors. Kinetic analysis showed that the administration of anti-CD25 mAb (PC61) later than day 2 after tumor inoculation caused no tumor regression, irrespective of depletion of CD4⁺CD25⁺ immunoregulatory cells. Two leukemias, on which the PC61-treatment had no effect, seemed to be incapable of eliciting effective rejection responses in the recipient mice because of low or no antigenicity.

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				M. Kaparakis, K. L. Laurie, O. Wijburg, J. Pedersen, M. Pearse, I. R. van Driel, P. A. Gleeson, and R. A. Strugnell CD4+ CD25+ Regulatory T Cells Modulate the T-Cell and Antibody Responses in Helicobacter-Infected BALB/c Mice. Infect. Immun., June 1, 2006; 74(6): 3519 - 3529. [Abstract] [Full Text] [PDF]

				W. Li and W. R. Green The Role of CD4 T Cells in the Pathogenesis of Murine AIDS. J. Virol., June 1, 2006; 80(12): 5777 - 5789. [Abstract] [Full Text] [PDF]

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				H. Nishikawa, F. Qian, T. Tsuji, G. Ritter, L. J. Old, S. Gnjatic, and K. Odunsi Influence of CD4+CD25+ Regulatory T Cells on Low/High-Avidity CD4+ T Cells following Peptide Vaccination J. Immunol., May 15, 2006; 176(10): 6340 - 6346. [Abstract] [Full Text] [PDF]

				M. Beyer, M. Kochanek, T. Giese, E. Endl, M. R. Weihrauch, P. A. Knolle, S. Classen, and J. L. Schultze In vivo peripheral expansion of naive CD4+CD25high FoxP3+ regulatory T cells in patients with multiple myeloma Blood, May 15, 2006; 107(10): 3940 - 3949. [Abstract] [Full Text] [PDF]

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				S. Chattopadhyay, S. Mehrotra, A. Chhabra, U. Hegde, B. Mukherji, and N. G. Chakraborty Effect of CD4+CD25+ and CD4+CD25- T Regulatory Cells on the Generation of Cytolytic T Cell Response to a Self but Human Tumor-Associated Epitope In Vitro J. Immunol., January 15, 2006; 176(2): 984 - 990. [Abstract] [Full Text] [PDF]

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