Narrowed TCR repertoire and viral escape as a consequence of heterologous immunity
Biochemistry & Molecular Pharmacology
Graduate School of Biomedical Sciences; Department of Pathology and Program in Immunology and Virology
Medical Subject Headings
Animals; CD8-Positive T-Lymphocytes; Cell Line; Cricetinae; Epitopes; Immune System; Immunologic Memory; Lymphocytic choriomeningitis virus; Mice; Mice, Inbred C57BL; Peptides; Pichinde virus; Receptors, Antigen, T-Cell
Life Sciences | Medicine and Health Sciences
Why some virus-specific CD8 TCR repertoires are diverse and others restricted or "oligoclonal" has been unknown. We show here that oligoclonality and extreme clonal dominance can be a consequence of T cell cross-reactivity. Lymphocytic choriomeningitis virus (LCMV) and Pichinde virus (PV) encode NP(205-212) epitopes that induce different but highly cross-reactive diverse TCR repertoires. Homologous viral challenge of immune mice only slightly skewed the repertoire and enriched for predictable TCR motifs. However, heterologous viral challenge resulted in a narrow oligoclonal repertoire with dominant clones with unpredictable TCR sequences. This shift in clonal dominance varied with the private, i.e., unique, specificity of the host's TCR repertoire and was simulated using affinity-based computer models. The skewing differences in TCR repertoire following homologous versus heterologous challenge were observed within the same private immune system in mice adoptively reconstituted with memory CD8 T cell pools from the same donor. Conditions driving oligoclonality resulted in an LCMV epitope escape variant in vivo resembling the natural Lassa virus sequence. Thus, T cell oligoclonality, including extremes in clonal dominance, may be a consequence of heterologous immunity and lead to viral escape. This has implications for the design of peptide-based vaccines, which might unintentionally prime for skewed TCR responses to cross-reactive epitopes.
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Citation: J Clin Invest. 2006 May;116(5):1443-56. Epub 2006 Apr 13. Link to article on publisher's site
Cornberg, Markus; Chen, Alex T.; Wilkinson, Lee A.; Brehm, Michael A.; Kim, Sung-Kwon; Calcagno, Claudia; Ghersi, Dario; Puzone, Roberto; Celada, Franco; Welsh, Raymond M.; and Selin, Liisa K., "Narrowed TCR repertoire and viral escape as a consequence of heterologous immunity" (2006). GSBS Student Publications. 247.