In:
The Journal of Experimental Medicine, Rockefeller University Press, Vol. 204, No. 5 ( 2007-05-14), p. 1131-1144
Abstract:
CD1d-restricted lymphocytes recognize a broad lipid range. However, how CD1d-restricted lymphocytes translate T cell receptor (TCR) recognition of lipids with similar group heads into distinct biological responses remains unclear. Using a soluble invariant NKT (iNKT) TCR and a newly engineered antibody specific for α-galactosylceramide (α-GalCer)–human CD1d (hCD1d) complexes, we measured the affinity of binding of iNKT TCR to hCD1d molecules loaded with a panel of α-GalCer analogues and assessed the rate of dissociation of α-GalCer and α-GalCer analogues from hCD1d molecules. We extended this analysis by studying iNKT cell synapse formation and iNKT cell activation by the same panel of α-GalCer analogues. Our results indicate the unique role of the lipid chain occupying the hCD1d F′ channel in modulating TCR binding affinity to hCD1d–lipid complexes, the formation of stable immunological synapse, and cell activation. These data are consistent with previously described conformational changes between empty and loaded hCD1d molecules (Koch, M., V.S. Stronge, D. Shepherd, S.D. Gadola, B. Mathew, G. Ritter, A.R. Fersht, G.S. Besra, R.R. Schmidt, E.Y. Jones, and V. Cerundolo. 2005. Nat. Immunol 6:819–826), suggesting that incomplete occupation of the hCD1d F′ channel results in conformational differences at the TCR recognition surface. This indirect effect provides a general mechanism by which lipid-specific lymphocytes are capable of recognizing both the group head and the length of lipid antigens, ensuring greater specificity of antigen recognition.
Type of Medium:
Online Resource
ISSN:
1540-9538
,
0022-1007
DOI:
10.1084/jem.20062342
Language:
English
Publisher:
Rockefeller University Press
Publication Date:
2007
detail.hit.zdb_id:
1477240-1
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