Abstract
Infections caused by Bacillus spores can be attenuated if the intracellular killing of the organism by macrophages can be enhanced. Glycoconjugate-bearing polymers, which selectively bind to Bacillus spores, were tested for modulation of intracellular killing when added prior to, during, and following macrophage exposure to B. cereus spores. In the absence of glycoconjugates, murine macrophages were ineffective at killing Bacillus spores. In presence of glycoconjugates, however, macrophages efficiently killed spores, whether the glycoconjugates were added to the cells prior to, during, and following spore addition. Glycoconjugates were shown to exert a protective influence on macrophages and increase their activation, as evidenced by viability and lactate dehydrogenase release assays. Increased levels of nitric oxide production by macrophages pretreated with glycoconjugates suggest that, under these conditions, glycoconjugates provide an activation signal to macrophages. These results indicate that glycoconjugates promote killing of Bacillus spores, while increasing macrophage activation level and viability. The selection of glycoconjugate ligands bearing immunomodulating properties could be exploited for vaccine and/or immunomodulator development and/or for the improvement of existing vaccines against B. cereus and B. anthracis.
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Abbreviations
- Glyc-PAA-flu:
-
Glycoconjugate-polyacrylamide-fluorescein polymer
- GC1:
-
Galα1-3 GalNAcα-PAA-flu glycoconjugate
- GC3:
-
GalNAcα1-3 GalNAc β-PAA-flu glycoconjugate
- GCs:
-
Glycoconjugates
- Gal:
-
Galactose
- GalNAc:
-
N-Acetylgalactosamine
- PAA:
-
Polyacrylamide
- flu:
-
Fluorescein
- LDH:
-
Lactate dehydrogenase
- NO:
-
Nitric oxide
- CFUs:
-
Colony forming units
- OD:
-
Optical density
- M:
-
Macrophage only
- M + sp:
-
Macrophages exposed to untreated spores
- U-sp:
-
Untreated spores
- GC-T sp:
-
Glycoconjugate-treated spores
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Acknowledgments
The present study was supported in part by start-up funds and a SEED institutional grant, originating from the Office for Research and Graduate Studies, University of Arkansas at Little Rock, Little Rock, AR, USA. In addition, the authors express their sincere appreciation to the reviewers of the Archives of Microbiology Journal for their valuable innovative ideas in improving the present manuscript and experimental design.
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Communicated by Sebastian Suerbaum.
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Tarasenko, O., Soderberg, L., Hester, K. et al. Glycoconjugates enhanced the intracellular killing of Bacillus spores, increasing macrophage viability and activation. Arch Microbiol 189, 579–587 (2008). https://doi.org/10.1007/s00203-008-0352-z
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DOI: https://doi.org/10.1007/s00203-008-0352-z