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The Journal of Immunology, Vol 157, Issue 9 3893-3901, Copyright © 1996 by American Association of Immunologists

ARTICLES

MHC genotype controls the capacity of ligand density to switch T helper (Th)-1/Th-2 priming in vivo

T Schountz, JP Kasselman, FA Martinson, L Brown and JS Murray
Center for Basic Cancer Research, Kansas State University, Manhattan 66506, USA.

A quantitative mechanism for the differentiation of CD4 T cells into recognized subsets of Th1 and Th2 effectors is controversial. Here, we define the Ag dose more precisely to the density of a minimal immunogenic peptide presented on the surface of a specific APC type. Th1 and Th2 responder MHC genotypes differ by as much as an order of magnitude in the density of this peptide displayed on B7-2+ B cells. We asked whether such B cells presenting a low ligand density primed Th2 effectors in an MHC genotype with predisposed high-density presentation and Th1-type immunity, and whether high ligand density B cells primed Th1 effectors in an MHC genotype that normally presents a low density and the Th2 phenotype. While low ligand density had the capacity to switch phenotype in the Th1 responder, high-density presentation did not alter genetically determined Th2 responder status.


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