The Journal of Immunology, Vol 152, Issue 10 4843-4851, Copyright © 1994 by American Association of Immunologists

ARTICLES

A nonimmunodominant nucleoprotein-derived peptide is presented by influenza A virus-infected H-2b cells

M Oukka, N Riche and K Kosmatopoulos
INSERM U.267 Immunogenetique des Allogreffes, Paul Brousse Hospital, Villejuif, France.

Influenza A virus-infected H-2b mice mount a CTL response directed against the nucleoprotein (NP) 366-374 but not against the NP 55-63 peptide, although both peptides fulfill the prerequisites for having high binding affinity toward the Db molecule. Two hypotheses have been proposed to explain the inability of B6 mice to respond to the NP 55-63 peptide: 1) B6 mice are tolerant to the NP 55-63 peptide and 2) NP 55- 63 peptide is not naturally processed by H-2b cells. Our results show that 1) B6 mice possess a NP 55-63-specific CTL repertoire because their immunization with the NP 55-63 peptide itself recruits specific CTL; 2) NP 55-63 peptide is naturally processed by the virus-infected H- 2b cells but its efficient presentation by the Db molecule requires higher amounts of NP than presentation of the NP 366-374 peptide; 3) NP 55-63 peptide is naturally presented in virus infected B6 mice, however, the quantity of Db/NP 55-63 complexes at the cell surface is sufficient to tolerize but not to recruit and stimulate specific CTL; and 4) NP 55-63 peptide binds to the Db molecule with a lower affinity than NP 366-374 does and this difference could explain the inefficient presentation of the NP 55-63 peptide by B6 cells. The involvement of the self-protein-derived nonimmunodominant peptides in self-tolerance and the possibility of using nonimmunodominant peptides of viral proteins for peptide vaccination are discussed.

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