Abstract
Lymphocyte homing is mediated by specific interaction between L-selectin on lymphocytes and the carbohydrate ligand 6-sulfo sialyl Lewis X on high endothelial venules. Here we generated mice lacking both core 1 extension and core 2 branching enzymes to assess the functions of O-glycan-borne L-selectin ligands in vivo. Mutant mice maintained robust lymphocyte homing, yet they lacked O-glycan L-selectin ligands. Biochemical analyses identified a class of N-glycans bearing the 6-sulfo sialyl Lewis X L-selectin ligand in high endothelial venules. These N-glycans supported the binding of L-selectin to high endothelial venules in vitro and contributed in vivo to O-glycan-independent lymphocyte homing in wild-type and mutant mice. Our results demonstrate the critical function of N-glycan-linked 6-sulfo sialyl Lewis X in L-selectin-dependent lymphocyte homing and recruitment.
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Acknowledgements
We thank S. Rosen, R. Cummings and M.N. Fukuda for discussions; Y. Altman for cell sorting; K. Sun for technical assistance; E. Lamar for critical reading of the manuscript; and A. Morse and T. Mabry for organizing the manuscript. S. Rosen (University of California at San Francisco) provided 38C13 B lymphoma cells. Supported by the National Institutes of Health (CA48737 to M.F.; P01 CA71932 to M.F. and J.B.L.; AI061663, AI069259 and AR42689 to U.H.v.A.; and DK48247 to J.D.M.) and the Taiwan National Science Council (95-3112-B-001-014 to the National Core Facilities for Proteomics (for mass spectrometry)).
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J.M. and X.B. did most of the experiments; B.P. did the rolling assays; P.S. and J.-M.G. did intravital microscopy; S.-Y.Y. did mass spectrometry; H.K. and H.S. assisted with the lymphocyte homing assay; K.O. and J.D.M. did embryonic stem cell culture; J.M., X.B., K.-H.K., U.H.v.A. and J.B.L. contributed to the preparation of the manuscript; and M.F. conceptualized the work, organized all experiments and wrote the manuscript.
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Supplementary information
Supplementary Fig. 1
Structure and biosynthesis of L-selectin ligands and Core1-β3GlcNAc knockout. (PDF 401 kb)
Supplementary Fig. 2
MECA-79 antibody inhibited lymphocyte homing in WT but not in Core1-β3GlcNAcT (C1-E) KO mice. (PDF 235 kb)
Supplementary Fig. 3
Effects of enzymatic digestions on binding of L-selectin-IgM to HEV. (PDF 162 kb)
Supplementary Fig. 4
Binding of N-glycan-specific lectins in HEV and their effects in inhibiting L-selectin-IgM binding. (PDF 439 kb)
Supplementary Fig. 5
MALDI-MS analysis of permethylated, sulfated N-glycans in negative ion mode. (PDF 663 kb)
Supplementary Fig. 6
Specificity of anti-CD34 antibody and number of leukocytes and CD3+ lymphocytes in contact hypersensitivity (CHS). (PDF 353 kb)
Supplementary Table 1
Tentative assignment of the MALDI-MS molecular ion signals afforded by the permethylated sulfated N-glycans in negative ion mode. (PDF 74 kb)
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Mitoma, J., Bao, X., Petryanik, B. et al. Critical functions of N-glycans in L-selectin-mediated lymphocyte homing and recruitment. Nat Immunol 8, 409–418 (2007). https://doi.org/10.1038/ni1442
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DOI: https://doi.org/10.1038/ni1442
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