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British Journal of Experimental Pathology logoLink to British Journal of Experimental Pathology
. 1988 Dec;69(6):865–875.

Effects of chronic injection of sphingomyelin-containing liposomes on lymphoid and non-lymphoid cells in the spleen. Transient suppression of marginal zone macrophages.

E Claassen 1, Y Westerhof 1, B Versluis 1, N Kors 1, M Schellekens 1, N van Rooijen 1
PMCID: PMC2013293  PMID: 3219288

Abstract

Mice were injected with sphingomyelin/cholesterol or phosphatidylcholine/cholesterol (PC/C) liposomes, from twice up to 10 times, on alternate days. Administration of sphingomyelin/cholesterol (SM/C) liposomes gave rise to hepato and splenomegaly, microgranulomatous infections and changes in macrophage numbers and activity in spleen and liver. Enzyme and immuno-cytochemical methods were used, to demonstrate the effect of liposomes on the lymphoid and non-lymphoid cell populations, on cryostat sections of the spleen. Routine histological staining, of sphingomyelin/cholesterol treated animals, showed no drastic changes in morphology or compartmentalization of the spleen, apart from a small enlargement (with some microgranulomas) of the red pulp. No significant differences were found in the presence or localization of T-helper, T-cytotoxic/suppressor, T-total-lymphocytes, B-total-lymphocytes, red pulp macrophages, marginal metallophils, or non-lymphoid dendritic cells. However, a transient suppression of cells expressing marginal zone macrophage surface marker ERTR-9, was observed between the second and eighth (intravenous) administration of sphingomyelin/cholesterol liposomes. Immunization of these animals with trinitrophenyl (TNP)-ficoll, a thymus-independent type-2 antigen which is specifically processed by marginal zone macrophages (MZM), showed that these cells were not suppressed with regard to their immunological function. We conclude that chronic administration of sphingomyelin liposomes influences macrophages, probably through a general phagocytic-system overload, but not permanent or damaging changes in splenic cell populations or immunological functions occur.

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Selected References

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