A Similar Expression Pattern of Adhesion Molecules between Intermediate TCR Cells in the Liver and Intraepithelial Lymphocytes in the Intestine

J-STAGE
  • Ohtsuka Kazuo
    The Department of Immunology, Niigata University School of Medicine
  • Hasegawa Katsuhiko
    The Department of Immunology, Niigata University School of Medicine
  • Sato Kazunari
    The Department of Immunology, Niigata University School of Medicine
  • Arai Katsumitsu
    The Department of Immunology, Niigata University School of Medicine
  • Watanabe Hisami
    The Department of Immunology, Niigata University School of Medicine
  • Asakura Hitoshi
    The Third Department of Internal Medicine, Niigata University School of Medicine
  • Abo Toru
    The Department of Immunology, Niigata University School of Medicine

抄録

Two major populations of extrathymically differentiated T cells exist in the liver and intestine. Such T cells in the liver have TCR of intermediate intensity (i.e., intermediate TCR cells) and constitutively express IL-2 receptor β-chain (IL-2Rβ), whereas those in the intestine, especially intraepithelial lymphocytes, have TCR of bright intensity, consisting of a mixture of IL-2Rβ+ and IL-2Rβ-. All mature thymocytes and thymus-derived T cells seen in the peripheral immune organs are TCR-bright+IL-2Rβ- under resting conditions. When the expression pattern of adhesion molecules, including CD44, L-selectin, LFA-1 and ICAM-1, was compared among these T-cell populations, they displayed quite unique patterns of expression. All extrathymic T cells in the liver, intestine, and even other organs were CD44+L-selectin-LFA-I++ ICAM-1+, whereas thymocytes and thymus-derived T cells were CD44-L-selectin+LFA-1+ICAM-1-. This inverted expression of adhesion molecules between extrathymic T cells and thymus-derived T cells might be associated with their unique tissue-localization.

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