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The rat RT1-A1c MHC molecule is a xenogeneic ligand recognized by the mouse activating Ly-49W and inhibitory Ly-49G receptors.

J. Immunol.2004 Mar 15;172(6):3518-26. doi:10.4049/jimmunol.172.6.3518
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摘要


Mouse Ly-49 receptors are known to recognize xenogeneic ligands from hamster and rat. However, until now, there has been no description of a specific rat xenogeneic ligand for any mouse Ly-49 receptor. In this report, we identify RT1-A1c, a rat classical class I MHC molecule, as a ligand for the Ly-49G(BALB/c) inhibitory receptor and the closely related activating receptor, Ly-49W. Xenogeneic class I recognition of targets from PVG but not DA strain rats was mapped to the classical region of the RT1c haplotype by using Con A blasts from RT1c/RT1av1 intra-MHC recombinant rats as targets for RNK-16 cells expressing either Ly-49W or Ly-49G(BALB/c) receptors. Individual expression of class I molecules from PVG and DA rat strains in YB2/0 target cells demonstrate the xenogeneic recognition to be allele specific, because other class I molecules of the RT1c haplotype, RT1-A2c and RT1-U2c, and a classical class I molecule encoded by the RT1av1 haplotype, RT1-Aa, are not recognized by Ly-49W and -G(BALB/c). Furthermore, specificity for RT1-Ac can be transferred from Ly-49W to Ly-49P, which is normally unable to recognize RT1-Ac, by substitution of three residues shared by Ly-49W and -G(BALB/c) but not Ly-49P. These residues are located in the Ly-49 beta4-beta5 loop, which can determine class I allele specificity in mouse Ly-49 receptor interactions with mouse class I ligands, suggesting that mouse Ly-49 recognition of rat class I molecules follows similar principles of interaction. These findings have implications for xenotransplantation studies and for discerning Ly-49 recognition motifs present in MHC molecules.

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