A reliable and safe T cell repertoire based on low-affinity T cell receptors
UNSPECIFIED. (2001) A reliable and safe T cell repertoire based on low-affinity T cell receptors. JOURNAL OF THEORETICAL BIOLOGY, 209 (4). pp. 465-486. ISSN 0022-5193Full text not available from this repository.
Antigens are presented to T cells as short peptides bound to MHC molecules on the surface of body cells. The binding between MHC/peptides and T cell receptors (TCRs) has a low affinity and is highly degenerate. Nevertheless, TCR-MHC/peptide recognition results in T cell activation of high specificity. Moreover, the immune system is able to mount a cellular response when only a small fraction of the MHC molecules on an antigen-presenting cell is occupied by foreign peptides, while autoimmunity remains relatively rare. We consider how to reconcile these seemingly contradictory facts using a quantitative model of TCR signalling and T cell activation. Taking into account the statistics of TCR recognition and antigen presentation, we show that thymic selection can produce a working T cell repertoire which will produce safe and effective responses, that is, recognizes foreign antigen presented at physiological levels while tolerating self. We introduce "activation curves" as a useful tool to study the repertoire's statistical activation properties. (C) 2001 Academic Press.
|Item Type:||Journal Article|
|Subjects:||Q Science > QH Natural history > QH301 Biology|
|Journal or Publication Title:||JOURNAL OF THEORETICAL BIOLOGY|
|Publisher:||ACADEMIC PRESS LTD|
|Official Date:||21 April 2001|
|Number of Pages:||22|
|Page Range:||pp. 465-486|
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