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Brucella Peptide Cross-Reactive Major Histocompatibility Complex Class I Presentation Activates SIINFEKL-Specific T Cell Receptor-Expressing T Cells
spp. are intracellular pathogenic bacteria remarkable in their ability to escape immune surveillance and therefore inflict a state of chronic disease within the host. To enable further immune response studies, was engineered to express the well-characterized chicken ovalbumin (OVA). Surprisingly, we...
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Published in: | Infection and immunity 2018-07, Vol.86 (7) |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | spp. are intracellular pathogenic bacteria remarkable in their ability to escape immune surveillance and therefore inflict a state of chronic disease within the host. To enable further immune response studies,
was engineered to express the well-characterized chicken ovalbumin (OVA). Surprisingly, we found that CD8 T cells bearing T cell receptors (TCR) nominally specific for the OVA peptide SIINFEKL (OT-1) reacted to parental
-infected targets as well as OVA-expressing
variants in cytotoxicity assays. Furthermore, splenocytes from
-immunized mice produced gamma interferon (IFN-γ) and exhibited cytotoxicity in response to SIINFEKL-pulsed target cells.To determine if the SIINFEKL-reactive OT-1 TCR could be cross-reacting to
peptides, we searched the
proteome using an algorithm to generate a list of near-neighbor nonamer peptides that would bind to H2K
Selecting five
peptide candidates, along with controls, we verified that several of these peptides mimicked SIINFEKL, resulting in T cell activation through the "SIINFEKL-specific" TCR. Activation was dependent on peptide concentration as well as sequence. Our results underscore the complexity and ubiquity of cross-reactivity in T cell recognition. This cross-reactivity may enable microbes such as
to escape immune surveillance by presenting peptides similar to those of the host and may also lead to the activation of autoreactive T cells. |
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ISSN: | 0019-9567 1098-5522 |
DOI: | 10.1128/IAI.00281-18 |