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Characterization of the ovalbumin‐specific TCR transgenic line OT‐I: MHC elements for positive and negative selection
Author(s) -
Clarke Sally RMcK,
Barnden Megan,
Kurts Christian,
Carbone Francis R,
Miller Jacques Fap,
Heath William R
Publication year - 2000
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1046/j.1440-1711.2000.00889.x
Subject(s) - ovalbumin , cd8 , biology , t cell receptor , positive selection , major histocompatibility complex , in vitro , transgene , mhc class ii , genetically modified mouse , mutant , microbiology and biotechnology , immunology , antigen , t cell , immune system , genetics , gene
The present report provides the first extensive characterization of the OT‐I TCR transgenic line, which produces MHC class I‐restricted, ovalbumin‐specific, CD8 + T cells (OT‐I cells). These cells are shown to be positively selected in vivo in H‐2 b C57BL/6 mice and in bm5 mice, which express the K bm5 mutant molecule. In contrast, OT‐I cells were not selected by mutant K b molecules in bm1, bm3, bm8, bm10, bm11 or bm23 mice. Interestingly, however, when positive selection was examined in vitro in foetal thymic organ culture (FTOC), bm1 and bm8 were still poorly selective, but the bm3 haplotype now selected as efficiently as B6. The ability to select in vitro correlated with the capacity to present the ovalbumin (OVA) peptide to OT‐I cells, as measured by induction of an OVA‐specific proliferative response. These results suggest that a lower affinity TCR:MHC interaction may be necessary for positive selection in FTOC compared with selection in situ .