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Blazar, B.R. et al.

Blazar, Carreno, Panoskaltsis-Mortari, Carter, Iwai, Yagita, Nishimura, Taylor,

Blockade of programmed death-1 engagement accelerates graft-versus-host disease lethality by an IFN-gamma-dependent mechanism.

Acute graft-vs-host disease (GVHD) is influenced by pathways that can enhance or reduce lethality by providing positive or negative signals to donor T cells. To date, the only reported pathway to inhibit GVHD is the CTLA-4:B7 pathway. Because absence of the programmed death-1 (PD-1) pathway has been implicated in a predisposition to autoimmunity and hence a lack of negative signals, the effect of PD-1 pathway blockade on GVHD was explored using several distinct approaches. In each, GVHD lethality was markedly accelerated. Coblockade of CTLA-4 and PD-1 was additive in augmenting GVHD, indicating that these pathways are not fully redundant. Although neither perforin nor Fas ligand expression was required for GVHD enhancement, donor IFN-gamma production was required for optimal GVHD acceleration in the absence of PD-1 ligation. These data indicate that PD-1 ligation down-regulates GVHD through modulation of IFN-gamma production and suggest a novel therapeutic target for inhibiting GVHD lethality.[1]

References

Blockade of programmed death-1 engagement accelerates graft-versus-host disease lethality by an IFN-gamma-dependent mechanism. Blazar, B.R., Carreno, B.M., Panoskaltsis-Mortari, A., Carter, L., Iwai, Y., Yagita, H., Nishimura, H., Taylor, P.A. J. Immunol. (2003) [Pubmed]

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