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. 1988 Mar;63(3):521–527.

The role of macrophages in LPS-induced lethality and tissue injury.

P H Groeneveld 1, E Claassen 1, C F Kuper 1, N Van Rooijen 1
PMCID: PMC1454743  PMID: 2965101

Abstract

In the present study we investigated the role of mononuclear phagocytes in the pathogenesis of lipopolysaccharide (LPS)-induced lethality and tissue injury. Since hepatic and splenic macrophages are the primary sites of localization of i.v.-injected LPS, we selectively eliminated these macrophages using liposome-encapsulated dichloromethylene diphosphonate (DMDP). After double DMDP-liposome treatment the phagocytic cells in the liver and spleen were completely eliminated, except for the macrophages in the white pulp of the spleen which were affected to a lesser extent by this treatment. An i.v. injection of LPS into DMDP- and saline-pretreated mice showed that the latter animals exhibited febrile-associated symptoms such as lethargy and ruffled fur, but that macrophage elimination abrogated these symptoms. Although after double saline- or DMDP-pretreatment the LD50 appears to be 1 mg and 630 micrograms, respectively, the differences in lethality between both groups of mice were not statistically significant. Therefore, we concluded that hepatic and splenic macrophages are not necessary for LPS-induced lethality. The role of macrophages in LPS-induced local tissue damage was studied by comparing the histopathological changes in hepatic and splenic tissue between DMDP- and saline-pretreated mice. A sublethal dose of LPS induced similar hepatic lesions in macrophage-depleted and saline-pretreated mice, whereas the histopathological changes in the spleen were much more pronounced after DMDP-pretreatment. Particularly in the inner periarteriolar lymphocyte sheath (PALS) of these mice, the number of T cells was considerably reduced and extensive cellular necrosis could be found. These data strongly suggest that the local tissue damage resulting from LPS injection may not be due to its localization in mononuclear phagocytes but rather to interaction with other cell types.

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Selected References

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