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. 1978 Apr;20(1):40–49. doi: 10.1128/iai.20.1.40-49.1978

Modulation of Myelopoiesis In Vivo by Chemically Pure Preparations of Cell Wall Components from Gram-Negative Bacteria: Effects at Different Stages

F G Staber 1, L Tarcsay 1, P Dukor 1
PMCID: PMC421547  PMID: 352936

Abstract

Modulation of myelopoiesis by chemically pure preparations of different cell wall components from gram-negative bacteria was investigated in vivo. The effects of lipid A, outer membrane lipoprotein, and murein were evaluated at several distinct stages: induction of colony-stimulating activity (CSA) in the serum, increase in the number of committed splenic precursor cells (CFU-C) forming granulocyte-macrophage colonies in vitro, and triggering into the cell cycle of noncommitted hemopoietic stem cells (CFU-S) from bone marrow. The results reveal different patterns of activity of the bacterial cell wall components (BCWC) tested. (i) In C57Bl/6 mice and C3H/Bom mice, all three preparations were potent inducers of CSA. In C3H/HeJ mice, CSA was only induced by lipoprotein and murein and not by lipid A. After injection of lipid A or lipoprotein, but not murein, the number of CFU-C in spleens of C57Bl/6 mice was increased up to 100-fold. In C3H/Bom and C3H/HeJ mice, not only murein but also lipoprotein were much less potent in this respect. (iii) In C57Bl/6 mice, both lipid A and lipoprotein, but not murein, were capable of inducing the proliferation of CFU-S, as demonstrated by a hot thymidine cytocide technique. Thus, induction of CSA and changes in the pool size of splenic CFU-C after administration of BCWC may be unrelated events. On the other hand, the increase of CFU-C might reflect the mitogenicity of BCWC for CFU-S.

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Selected References

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