Interleukin 2-diphtheria toxin fusion protein can abolish cell-mediated immunity in vivo
Autor: | Jean C. Nichols, Terry B. Strom, Vicki E. Kelley, Patricia Bacha, John R. Murphy, Oleh Pankewycz |
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Rok vydání: | 1988 |
Předmět: |
Interleukin 2
Cellular immunity Diphtheria Toxoid T-Lymphocytes Protein subunit Mice Immune system In vivo medicine Animals Diphtheria Toxin Hypersensitivity Delayed Receptors Immunologic Diphtheria toxin Immunity Cellular Multidisciplinary biology Immunotoxins Receptors Interleukin-2 Flow Cytometry Fusion protein Virology Molecular biology biology.protein Interleukin-2 Lymph Nodes Antibody Research Article medicine.drug |
Zdroj: | Proceedings of the National Academy of Sciences. 85:3980-3984 |
ISSN: | 1091-6490 0027-8424 |
Popis: | De novo expression of the interleukin 2 receptor (IL-2R) is a critical and pivotal event in initiation of an immune response. Targeting the low-affinity IL-2-binding p55 subunit of the high-affinity IL-2R with the rat anti-mouse IgM monoclonal antibody M7/20 suppresses a variety of T-cell-mediated reactions, including transplant rejection, autoimmunity, and delayed-type hypersensitivity (DTH). A hybrid IL-2-toxin gene was constructed from the diphtheria toxin gene by replacing the DNA encoding the diphtheria toxin receptor-binding domain with the DNA encoding the receptor-binding domain of IL-2, and the fusion protein encoded by the hybrid gene was expressed in Escherichia coli [Williams, D.P., Parker, K., Bacha, P., Bishai, W., Borowski, M., Genbauffe, F., Strom, T.B. & Murphy, J.R. (1987) Protein Eng. 1, 493-498]. We examined the action of the chimeric IL-2-toxin fusion protein on an in vivo T-cell mediated response, DTH. The IL-2-toxin fusion protein was found to be a potent immunosuppressive agent. Treatment of mice with the IL-2-toxin blocks DTH and prevents expansion of IL-2R+ T cells. Indeed, IL-2-toxin treatment targets IL-2R+ T cells in vivo and is shown to selectively eliminate their appearance in draining lymph nodes. DTH suppression was observed even in mice possessing high titers of antibodies to diphtheria toxoid. |
Databáze: | OpenAIRE |
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