Functionality of major histocompatibility complex class II molecules in mice doubly deficient for invariant chain and H-2M complexes.
Proc Natl Acad Sci U S A
; 94(17): 9255-60, 1997 Aug 19.
Article
em En
| MEDLINE
| ID: mdl-9256469
ABSTRACT
By combining two previously generated null mutations, Ii degrees and M degrees , we produced mice lacking the invariant chain and H-2M complexes, both required for normal cell-surface expression of major histocompatibility complex class II molecules loaded with the usual diverse array of peptides. As expected, the maturation and transport of class II molecules, their expression at the cell surface, and their capacity to present antigens were quite similar for cells from Ii degrees M degrees double-mutant mice and from animals carrying just the Ii degrees mutation. More surprising were certain features of the CD4(+) T cell repertoire selected in Ii degrees M degrees mice many fewer cells were selected than in Ii+M degrees animals, and these had been purged of self-reactive specificities, unlike their counterparts in Ii+M degrees animals. These findings suggest (i) that the peptides carried by class II molecules on stromal cells lacking H-2M complexes may almost all derive from invariant chain and (ii) that H-2M complexes edit the peptide array displayed on thymic stromal cells in the absence of invariant chain, showing that it can edit, in vivo, peptides other than CLIP.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Antígenos H-2
/
Antígenos de Histocompatibilidade Classe II
/
Apresentação de Antígeno
Limite:
Animals
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article