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Inhibition of LIGHT (a cellular ligand for herpes virus entry mediator and lymphotoxin receptor)/herpes simplex virus entry mediator (HVEM) and LIGHT/lymphotoxin beta receptor (LT beta R) interactions decreases mortality in MHC class I and II disparate graft-vs-host disease (GVHD). The present studies assessed the effects of these interactions on the generation of CD4+ T cell alloresponses in MHC class II-disparate MLC and GVHD. An inhibitor protein of LIGHT and LT alpha beta2 (LT beta R-Ig) and an inhibitor protein of LIGHT (HVEM-Ig) caused similar decreases in alloresponses of control B6 or B6.129S1-IL12rb2(tm1Jm) (B6.IL12R-/-) spleen cells (SpC) in a MHC class II-disparate MLC. GVHD-induced wasting disease in MHC class II-disparate recipients of B6 CD4+ SpC who received either the LT beta R-Ig-encoding adenovirus (LT beta R-Ig Adv; 13.1 +/- 10.9%; n = 10; p = 0.0004) or the HVEM-Ig-encoding adenovirus (HVEM-Ig Adv; 16.4 +/- 9.9%; n = 13; p = 0.0008) was significantly reduced compared with that in recipients of a control adenovirus (30.4 +/- 8.8%; n = 13). Furthermore, gut GVHD histologic scores of recipients of B6 CD4+ SpC who received the LT beta R-Ig Adv (0.8 +/- 0.8; n = 5; p = 0.0007) or the HVEM-Ig Adv (1.4 +/- 0.5; n = 5; p = 0.008) were reduced compared with scores of recipients of a control adenovirus (2.5 +/- 0.75; n = 11). In the intestine, both LT beta R-Ig Adv and HVEM-Ig Adv decreased CD4+ T cells (0.35 +/- 0.4 x 10(6) (n = 6) vs 0.36 +/- 0.02 x 10(6) (n = 9); p = 0.03 and p = 0.007) compared with control adenovirus (0.86 +/- 0.42 x 10(6); n = 9). LIGHT is critical for optimal CD4+ T cell alloresponses in MHC class II-disparate MLC and GVHD.

the journal of immunology/the journal of immunology

IL-12-Independent LIGHT Signaling Enhances MHC Class II Disparate CD4+ T Cell Alloproliferation, IFN-γ Responses, and Intestinal Graft-versus-Host Disease