γδ T‐cell receptors: functional correlations

RL O'Brien, CL Roark, N Jin… - Immunological …, 2007 - Wiley Online Library
RL O'Brien, CL Roark, N Jin, M Kemal Aydintug, JD French, JL Chain, JM Wands
Immunological reviews, 2007Wiley Online Library
The γδ T‐cell receptors (TCRs) are limited in their diversity, suggesting that their natural
ligands may be few in number. Ligands for γδTCRs that have thus far been determined are
predominantly of host rather than foreign origin. Correlations have been noted between the
Vγ and/or Vδ genes a γδ T cell expresses and its functional role. The reason for these
correlations is not yet known, but several different mechanisms are conceivable. One
possibility is that interactions between particular TCR‐V domains and ligands determine …
Summary
The γδ T‐cell receptors (TCRs) are limited in their diversity, suggesting that their natural ligands may be few in number. Ligands for γδTCRs that have thus far been determined are predominantly of host rather than foreign origin. Correlations have been noted between the Vγ and/or Vδ genes a γδ T cell expresses and its functional role. The reason for these correlations is not yet known, but several different mechanisms are conceivable. One possibility is that interactions between particular TCR‐V domains and ligands determine function or functional development. However, a recent study showed that at least for one ligand, receptor specificity is determined by the complementarity‐determining region 3 (CDR3) component of the TCR‐δ chain, regardless of the Vγ and/or Vδ. To determine what is required in the TCR for other specificities and to test whether recognition of certain ligands is connected to cell function, more γδTCR ligands must be defined. The use of recombinant soluble versions of γδTCRs appears to be a promising approach to finding new ligands, and recent results using this method are reviewed.
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