期刊
JOURNAL OF IMMUNOLOGY
卷 175, 期 10, 页码 6473-6480出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.175.10.6473
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DM functions as a peptide editor for MHC class II-bound peptides. We examined the hypothesis that DM peptide editing plays a key role in focusing the in vivo CD4 T cell responses against complex pathogens and protein Ags to only one, or at most a few, immunodominant peptides. Most CD4 T cells elicited in the wild-type BALB/c (H-2(d)) mice infected with Leishmania major predominantly recognize a single epitope 158-173 within Leishmanin homologue of activated receptor for c-kinase (LACK), as is the case when these mice are immunized with rLACK. Using DM-deficient (DM-/-) H-2(d) mice, we now show that in the absence of DM, the in vivo CD4 T cell responses to rLACK are skewed away from the immunodominant epitopes and are diversified to include two novel epitopes (LACK 33-48 and 261-276). DM-/- B10.BR (H-2(k)) mice showed similar results. These results constitute the first demonstration of the role of DM peptide editing in sculpting the specificity and immodominance in in vivo CD4 T cell responses.
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