The Journal of Immunology, Vol 135, Issue 5 3004-3010, Copyright © 1985 by American Association of Immunologists

ARTICLES

Surface markers of T cells causing lethal graft-vs-host disease to class I vs class II H-2 differences

R Korngold and J Sprent

Information was sought on the phenotype of lymphoid cells causing lethal graft-vs-host disease (GVHD) in irradiated mice expressing whole or partial H-2 differences. In all strain combinations tested, pretreating donor lymph node (LN) cells with anti-Thy-1 monoclonal antibodies (MAb) plus complement (C) abolished mortality. With GVHD directed to class I H-2 differences, pretreating LN cells with anti-Lyt- 2 MAb prevented mortality, whereas MAb specific for Ly-1 or L3T4 cell surface determinants caused severe mortality. These data imply that lethal GVHD directed to class I H-2 differences is mediated by L3T4-, Lyt-2+ cells; this subset of T cells was shown previously to control GVHD directed to multiple minor histocompatibility antigens, i.e., antigens seen in the context of self-class I molecules. With whole H-2 differences, GVHD appeared to be controlled largely but not exclusively by L3T4+, Lyt-2-T cells. This T cell subset was also the predominant cause of GVHD directed to class II differences. With class II incompatibilities, depleting donor cells of L3T4+ T cells, either by pretreatment with anti-L3T4 MAb + C or by fluorescence activated cell sorter selection, greatly reduced but did not completely abolish GVHD. These data might imply that L3T4-, Lyt-2+ cells have some capacity to elicit anti-class II GVHD. A more likely possibility, however, is that the residual GVHD to class II differences observed with Lyt-2+-enriched cells reflected minor contamination with L3T4+ cells.

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