Alterations in cell surface carbohydrates on T cells from virally infected mice can distinguish effector/memory CD8+ T cells from naive cells.
Glycosylation changes on surface molecules of T cells affect cell trafficking and function and may be useful in discriminating between naive, effector, and memory T cells. To analyze oligosaccharide structures on T cells activated in vivo, we examined alterations in sialic acid residues on T cells following infection of mice with lymphocytic choriomeningitis (LCMV), vaccinia virus, and vesicular stomatitis virus. We found that the majority of CD8 T cells from mice acutely infected with these viruses showed increased binding to peanut agglutinin (PNA). All of the PNAhighCD8 T cells from infected mice were CD44high, indicating that glycosylation changes were occurring on activated T cells. There was also an increase in the PNAhighCD4 T cell population in virally infected mice. Increased PNA binding to activated CD8 T cells correlated with higher endogenous neuraminidase levels in these cells. This higher neuraminidase activity most likely contributed to the PNAhigh phenotype by cleaving sialic acid residues off the core-1 O-glycans or glycoproteins destined for the cell surface. A PNAhighCD8 T cell population persisted in immune mice that had cleared the LCMV infection. When spleen cells from immune mice were sorted into PNAhigh and PNAlow populations, >95% of the LCMV-specific memory CD8 T cells segregated with the PNAhigh population. This shows that virus-specific memory CD8 T cells remain hyposialylated and can be distinguished from naive CD8 T cells based on PNA binding. Thus, PNA can be used as a marker for Ag-experienced T cells.
Department of Microbiology and Immunology, University of California Los Angeles School of Medicine 90095, USA.
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Galvan
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Murali-Krishna
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Ming
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L
Baum
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Ahmed
D000818:Animals; D015415:Biomarkers / Q000032:analysis; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000201:enzymology / Q000276:immunology* / Q000378:metabolism; D002462:Cell Membrane / Q000276:immunology / Q000378:metabolism; D004789:Enzyme Activation / Q000276:immunology; D007156:Immunologic Memory; D007399:Interphase / Q000276:immunology; D008213:Lymphocyte Activation; D008216:Lymphocytic Choriomeningitis / Q000276:immunology* / Q000378:metabolism; D008217:Lymphocytic choriomeningitis virus / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009439:Neuraminidase / Q000378:metabolism; D009844:Oligosaccharides / Q000276:immunology* / Q000378:metabolism*; D019887:Peanut Agglutinin / Q000378:metabolism; D011485:Protein Binding / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000201:enzymology / Q000276:immunology
D015415:Biomarkers; D009844:Oligosaccharides; D019887:Peanut Agglutinin; D009439:Neuraminidase