Absence of tapasin alters immunodominance against a lymphocytic choriomeningitis virus polytope

Boulanger, Denise S.M., Oliveira, Roberta, Ayres, Lisa, Prior, Stephen H., James, Edward, Williams, Anthony P. and Elliott, Tim (2009) Absence of tapasin alters immunodominance against a lymphocytic choriomeningitis virus polytope Journal of Immunology, 184, (1), pp. 73-83. (doi:10.4049/jimmunol.0803489).


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Tapasin edits the peptide repertoire presented to CD8+ T cells by favoring loading of slow off-rate peptides on MHC I molecules. To investigate the role of tapasin on T cell immunodominance we used poxvirus viral vectors expressing a polytope of lymphocytic choriomeningitis virus epitopes with different off-rates. In tapasin-deficient mice, responses to subdominant fast off-rate peptides were clearly favored. This alteration of the CD8+ T cell hierarchy was a consequence of tapasin editing and not a consequence of the alteration of the T cell repertoire in tapasin-deficient mice, because bone marrow chimeric mice (wild-type recipients reconstituted with tapasin knockout bone marrow) showed the same hierarchy as the tapasin knockout mice. Tapasin editing is therefore a contributing factor to the phenomenon of immunodominance. Although tapasin knockout cells have low MHC I surface expression, Ag presentation was efficient and resulted in strong T cell responses involving T cells with increased functional avidity. Therefore, in this model, tapasin-deficient mice do not have a reduced but rather have an altered immune response.

Item Type: Article
Digital Object Identifier (DOI): doi:10.4049/jimmunol.0803489
ISSNs: 0022-1767 (print)
Subjects: Q Science > QR Microbiology > QR180 Immunology
R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
ePrint ID: 73379
Date :
Date Event
30 November 2009Accepted/In Press
1 January 2010Published
Date Deposited: 05 Mar 2010
Last Modified: 18 Apr 2017 20:51
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/73379

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