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The Journal of Immunology, 2000, 164: 3140-3148.
Copyright © 2000 by The American Association of Immunologists

NKT Cells in the Rat: Organ-Specific Distribution of NK T Cells Expressing Distinct V{alpha}14 Chains1 ,2

Akihiro Matsuura3, Miyuki Kinebuchi, Hong-Zhi Chen, Shigeo Katabami, Tadakazu Shimizu, Yuji Hashimoto, Kokichi Kikuchi and Noriyuki Sato

Sapporo Medical University, School of Medicine, Department of Pathology, Sapporo, Japan

Rat invariant TCR {alpha}-chains and NKT cells were investigated to clarify whether CD1d-mediated recognition by NKT cells is conserved further in evolution. Rats had multiple-copies of TRAV14 genes, which can be categorized into two types according to the diversity accumulated in the CDR2 region. Rats retained invariant TCR{alpha} forms with the homogeneous junctional region similar to mouse invariant TRAV14-J281. The proportion of invariant TCR among V{alpha}14+ clones was 12.9% in the thymus and increased in the periphery, 31% in the spleen and 95% in hepatic sinusoidal cells. The invariant TRAV14-J281 was expressed by liver sinusoidal and splenic NKT cells with CD8, CD44high, and TCR Vß8. Type 1 invariant TCR{alpha} was expressed more frequently in hepatic lymphocytes, while type 2 invariant TCR{alpha} was expressed predominantly in the spleen. Both types of cells cytolyzed to and were stimulated to proliferate by CD1d-expressing cells in a CD1d-restricted manner. These results suggested that rat NKT cells bearing distinct V{alpha}14 chains are distributed in a tissue-specific pattern. NKT cell populations in rats were more variable than those in mice, indicating that they play novel roles in nature. The implication of the molecular interaction between the structurally diverse invariant TCR{alpha} and CD1d/ligand complex in different organs is discussed.




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