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Requirements for Stimulating Naive CD8⁺ T Cells via Signal 1 Alone

Alain T. Luxembourg^1,*, Anders Brunmark^*, Yan Kong^*, Michael R. Jackson^*, Per A. Peterson^*, Jonathan Sprent^2, and Zeling Cai^3,*

^* R. W. Johnson Pharmaceutical Research Institute, San Diego, CA 92121; and Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

In the absence of costimulation, TCR recognition of peptide/MHC complexes is generally considered to be nonimmunogenic. In agreement with this view, naive TCR transgenic CD8⁺ cells failed to respond to specific peptides presented by MHC class I (L^d) molecules bound to mouse RBC. However, peptide/L^d complexes presented by cell-sized beads or bound to plastic led to overt proliferative responses in the absence of added cytokines. Significantly, equivalent strong proliferative responses occurred when mouse RBC were fixed with glutaraldehyde before L^d coupling. The implication therefore is that the intensity of signaling via the TCR is a reflection of the mobility of the ligand being recognized; TCR signaling is weak when the ligand can move laterally on the cell membrane but strong when the ligand is immobilized.

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