Progressive accumulation of bacterial lipopolysaccharide in vivo during murine acute graft-versus-host disease.

Abstract:

:In a previous report the authors demonstrated that acute graft-versus-host disease (GVHD) was associated with pathologic amounts of tumour necrosis factor alpha (TNF-alpha) and the appearance of lipopolysaccharide (LPS) in the blood of GVH reactive mice just prior to death. In this study the authors have investigated the kinetics of LPS accumulation in different organs during the course of acute GVHD using a murine model. Unirradiated C57BL/6 x AF1 (B6AF(1)) mice were transplanted with C57BL/6 (B6) lymphoid cells and killed at predetermined times after transplantation for LPS analysis. Control animals were injected with either 60 x 10(6) B6AF1 lymphoid cells (syngeneic) or 60 x 10(6) irradiated (2000 rad) CBA lymphoid cells (allogeneic). Lipopolysaccharide began to appear in the liver and the spleen of GVH reactive mice from day 2 post-transplant and by day 10 all GVH reactive mice tested positive for hepatic and splenic LPS. Low levels of LPS were detected in some control mice from days 2 to 10 post-transplant but LPS was never detected after day 10 in control groups. Total hepatic and splenic LPS in acute GVH reactive mice peaked at a time coincident with the appearance of LPS in the serum and with the onset of mortality. These results demonstrate that tissue levels of LPS increase throughout the course of acute GVHD and are sufficient to trigger the release of pathologic amounts of TNF-alpha from primed macrophages resulting in the cachexia and mortality associated with acute GVHD in this model.

journal_name

Scand J Immunol

authors

Price KS,Nestel FP,Lapp WS

doi

10.1046/j.1365-3083.1997.d01-404.x

subject

Has Abstract

pub_date

1997-03-01 00:00:00

pages

294-300

issue

3

eissn

0300-9475

issn

1365-3083

journal_volume

45

pub_type

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