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T Cell-Independent Regulation of IgE Antibody Production Induced by Surface-Linked Liposomal Antigen¹

Maiko Taneichi^*, Seishiro Naito^*, Hiroshi Kato^*, Yuriko Tanaka^*, Masahito Mori, Yoshio Nakano, Hiroyuki Yamamura, Hiroshi Ishida, Katsutoshi Komuro^* and Tetsuya Uchida^2,*

^* Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases and Drug Delivery System Development Division, Nippon Oil and Fat Corporation, Tokyo, Japan; and Department of Internal Medicine, National Utano Hospital, Kyoto, Japan

Control of IgE Ab production is important for the prevention of IgE-related diseases. However, in contrast to the existing information on the induction of IgE production, little is known about the regulation of the production of this isotype, with the exception of the well-documented mechanism involving T cell subsets and their cytokine products. In this study, we demonstrate an alternative approach to interfere with the production of IgE, independent of the activity of T cells, which was discovered during the course of an investigation intended to clarify the mechanism of IgE-selective unresponsiveness induced by surface-coupled liposomal Ags. Immunization of mice with OVA-liposome conjugates induced IgE-selective unresponsiveness without apparent Th1 polarization. Neither IL-12, IL-10, nor CD8⁺ T cells participated in the regulation. Furthermore, CD4⁺ T cells of mice immunized with OVA-liposome were capable of inducing Ag-specific IgE synthesis in athymic nude mice immunized with alum-adsorbed OVA. In contrast, immunization of the recipient mice with OVA-liposome did not induce anti-OVA IgE production, even when CD4⁺ T cells of mice immunized with alum-adsorbed OVA were transferred. In the secondary immune response, OVA-liposome enhanced anti-OVA IgG Ab production, but it did not enhance ongoing IgE production, suggesting that the IgE-selective unresponsiveness induced by the liposomal Ag involved direct effects on IgE, but not IgG switching in vivo. These results suggest the existence of an alternative mechanism not involving T cells in the regulation of IgE synthesis.

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				M. Taneichi, H. Ishida, K. Kajino, K. Ogasawara, Y. Tanaka, M. Kasai, M. Mori, M. Nishida, H. Yamamura, J. Mizuguchi, et al. Antigen Chemically Coupled to the Surface of Liposomes Are Cross-Presented to CD8+ T Cells and Induce Potent Antitumor Immunity J. Immunol., August 15, 2006; 177(4): 2324 - 2330. [Abstract] [Full Text] [PDF]