Immunologic Research

, 15:98

Role of the T cell receptor α-chain in superantigen recognition

  • Marcia A. Blackman
  • David L. Woodland
Article

DOI: 10.1007/BF02918500

Cite this article as:
Blackman, M.A. & Woodland, D.L. Immunol Res (1996) 15: 98. doi:10.1007/BF02918500

Abstract

Superantigens bind to antigen-presenting cells on the outside of the major histocompatibility complex (MHC) class II molecule and to T cells via the external face of the T cell receptor (TCR) Vβ element. As a consequence, superantigens stimulate populations of T cells in a Vβ-specific, non-MHC-restricted manner. However, accumulating evidence has shown an additional contribution of the TCR α-chain and polymorphic residues of the MHC molecule to superantigen recognition by some T cells. These data suggest that the TCR and MHC come into contact during superantigen engagement and indirectly modulate the superantigen reactivity. Thus, additional interactions between non-Vβ elements of the TCR and MHC play a role in the overall stability of the superantigen/MHC/TCR complex, explaining the influence of the TCR α-chain. It is likely that this additional interaction is of greater consequence for weakly reactive T cells. This modulation of superantigen reactivity in individual T cells may have physiological consequences, for example, in the induction of autoimmunity.

Key Words

T cellsSuperantigenT cell receptor α-chainMajor histocompatibility complexEnterotoxin B, staphylococcalLymphocyte-stimulating locus, minor

Copyright information

© Humana Press Inc. 1996

Authors and Affiliations

  • Marcia A. Blackman
    • 1
    • 2
  • David L. Woodland
    • 1
    • 2
  1. 1.Department of ImmunologySt. Jude Children’s Research HospitalMemphis(USA)
  2. 2.Department of PathologyUniversity of TennesseeMemphisUSA