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International Immunology Advance Access originally published online on August 9, 2005
International Immunology 2005 17(9):1167-1178; doi:10.1093/intimm/dxh294
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© The Japanese Society for Immunology. 2005. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

The role of suppressor of cytokine signaling 1 as a negative regulator for aberrant expansion of CD8{alpha}+ dendritic cell subset

Jun Tsukada1,2, Akemi Ozaki1, Toshikatsu Hanada3, Takatoshi Chinen3, Ryo Abe2, Akihiko Yoshimura3 and Masato Kubo1

1 Laboratory for Signal Network, Research Center for Allergy and Immunology (RCAI), RIKEN Yokohama Institute, Suehiro-cho 1-7-22, Tsurumi, Yokohama, Kanagawa 230-0045, Japan
2 Division of Immunobiology, Research Institute for Biological Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba 278-0022, Japan
3 Division of Molecular and Cellular Immunology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Umaide, Higashi-hu Fukuoka 812-8582, Japan

Correspondence to: M. Kubo; E-mail: raysolfc{at}rcai.riken.jp

The suppressor of cytokine signaling (SOCS) 1 is a negative regulator in multiple cytokine-related aspects to maintain immunological homeostasis. Here, we studied a role of SOCS1 on dendritic cell (DC) maturation in the mice lacking either TCR{alpha} chain or CD28 in SOCS1-deficient background, and found that the SOCS1 could restore acute phase of inflammatory response in SOCS1-deficient mice. The CD11c+ CD8– DC population in freshly isolated splenic DCs from normal mice highly expressed SOCS1. However, in SOCS1-deficient environment, the proportion of CD8{alpha}+ DCs (CD8 DCs) noticeably increased without affecting the cell number of conventional and plasmacytoid DC populations. This population revealed the CD11cdull CD8{alpha}+ CD11b– CD45RA– B220– phenotype, which is a minor population in normal mice. Localization of the abnormal CD8 DCs in splenic microenvironments was mainly restricted to deep within red pulp. The CD8 DCs secrete a large amount of IFN-{gamma}, IL-12 and B lymphocyte stimulator/B cell activation factor of the tumor necrosis factor family in response to LPS and CpG stimulation. This is responsible for the development of DC-mediated systemic autoimmunity in the old age of SOCS1-deficient mice. Moreover, the CD8 DC subsets expressed more indoleamine 2,3-dioxygenase and IL-10, and hence inhibit the allogeneic proliferative T cell response and antigen-induced Th1 responses. Therefore, SOCS1 expression during DC maturation plays a role in surveillance in controlling the aberrant expansion of abnormal DC subset to maintain homeostasis of immune system.

Keywords: antigen presentation, CD8, dendritic cell, SOCS1

Transmitting editor: T. Watanabe


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