The Journal of Immunology, Vol 155, Issue 8 3856-3865, Copyright © 1995 by American Association of Immunologists

ARTICLES

Inhibition of T cell costimulation by VCAM-1 prevents murine graft- versus-host disease across minor histocompatibility barriers

PG Schlegel, M Vaysburd, Y Chen, EC Butcher and NJ Chao
Bone Marrow Transplant Program H1353, Stanford University School of Medicine, CA 94305, USA.

Activation of T cells leading to graft-vs-host disease (GVHD) requires two signaling events: the Ag-specific signal generated through the engagement of the TCR/CD3 complex with antigenic peptide fragments presented by MHC molecules on APCs and the second signal provided through additional costimulatory ligands. T cells have preferential costimulatory requirements depending on their state of activation- induced maturation. In the present study, we investigated the role of the receptor-ligand pair VLA-4 (alpha 4 beta 1) and VCAM-1 in allogeneic T cell responses in vitro and in vivo. Anti-VCAM-1 mAb effectively inhibited mixed lymphocyte culture (MLC) across several major MHC barriers and secondary MLC across minor histocompatibility Ags (95.5% and 90.0% inhibition, respectively). In contrast, anti-VLA-4 mAb inhibited a CD8(+)-mediated primed CTL response in vitro by 100%, yet had little effect on proliferative responses. In the B10.D2/nSnJ-- >BALB/c (both H-2d) system of GVHD, BALB/c received anti-VCAM-1, or anti-VLA-4 or controls NS-1 or Y13-259 for the first 5 wk after transplant. Anti-VLA-4 mAb delayed the onset of GVHD, but failed to reduce incidence, severity or GVHD-related mortality. In contrast, anti- VCAM-1 reduced the incidence of GVHD from 100% (18/18) in control animals to 53.3% (8/15) (p < 0.01) on day 70 post-transplant and significantly decreased GVHD-related mortality. Sixty percent (9/15) of anti-VCAM-1 recipients survived more than 180 days after transplant. Long-term engraftment of allogeneic bone marrow was documented in all transplanted mice by PCR analysis of a microsatellite region in the IL- 1 beta gene.

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