Signalling through the MHC class II cytoplasmic domain is required for antigen presentation and induces B7 expression

CLASS II major histocompatibility complex (MHC) molecules function as antigen-presenting elements as well as signal transducers on B lymphocytes. We previously reported that a B lymphoma cell transfectant, 5C2, expressing genetically engineered I-A(k) molecules with truncated cytoplasmic domains was...

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Bibliographic Details
Published in:Nature (London) 1992-11, Vol.360 (6401), p.266-268
Main Authors: Nabavi, N, Freeman, G. J, Gault, A, Godfrey, D, Nadler, L. M, Glimcher, L. H
Format: Article
Language:English
Subjects:
Animals
Antigen-Presenting Cells - physiology
Antigens
Antigens, CD - physiology
Antigens, Differentiation, T-Lymphocyte - physiology
Antigens, Surface - physiology
B-Lymphocytes - physiology
B7-1 Antigen
Biological and medical sciences
CD28 Antigens
CD8 Antigens - physiology
Cell Communication - physiology
Cell Line
Fundamental and applied biological sciences. Psychology
Fundamental immunology
Histocompatibility antigens (hla, h-2 and other systems)
Histocompatibility Antigens Class II - chemistry
Histocompatibility Antigens Class II - physiology
Humans
Mice
Molecular immunology
Multidisciplinary Sciences
Science & Technology
Science & Technology - Other Topics
Signal Transduction
Structure-Activity Relationship
T-Lymphocytes - metabolism
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Summary:CLASS II major histocompatibility complex (MHC) molecules function as antigen-presenting elements as well as signal transducers on B lymphocytes. We previously reported that a B lymphoma cell transfectant, 5C2, expressing genetically engineered I-A(k) molecules with truncated cytoplasmic domains was severely impaired in both antigen presentation and in anti-Ia-induced intracytoplasmic signalling1-5. These two functions could be restored by preculturing 5C2 cells with cyclic AMP analogues6,7. Here we demonstrate that impaired signal transduction by truncated class II molecules results in a deficiency in induction of the newly defined B-cell accessory molecule B7 (ref. 8), which can be reversed by restoration of B7 expression. These data imply that contact of the T-cell antigen receptor with MHC/antigen ligand results in signal transmission through the class II cytoplasmic domain. This signal, which can be mimicked by dibutyryl cAMP, induces expression of B7, resulting in effective antigen presentation. The fact that crosslinking of surface class II MHC also induces B7 expression on normal resting human B cells9 supports this contention.
ISSN:0028-0836
1476-4687
DOI:10.1038/360266a0