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Updated: May 27, 2026

Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens
Published on: May 19, 2020
Glycoconjugates prevent B. anthracis toxin-induced cell death through binding while activating macrophages.
Olga Tarasenko1, Ashley Scott, Lee Soderberg
1Department of Biology, University of Arkansas at Little Rock, 72204, USA. omtarasenko@ualr.edu
Glycoconjugate-bearing polymers protect macrophages from Bacillus anthracis toxins. These polymers activate macrophages, increasing nitric oxide production and enhancing cell viability against toxin-induced death.
Area of Science:
- Immunology
- Microbiology
- Polymer Science
Background:
- Bacillus anthracis toxins pose a significant threat, and macrophage neutralization is a potential countermeasure.
- Glycoconjugate-bearing polymers (GCs) are known to bind Bacillus spores.
- Understanding GCs' interaction with Bacillus toxins is crucial for developing new therapeutics.
Purpose of the Study:
- To investigate the protective effects of glycoconjugate-bearing polymers against Bacillus anthracis toxins.
- To assess the impact of GCs on macrophage activity and survival when exposed to toxins.
- To explore the potential of GCs as immunomodulatory agents.
Main Methods:
- Murine macrophages were exposed to Bacillus anthracis toxins with and without glycoconjugate activation.
- Macrophage cell viability was assessed using the trypan blue assay.
- Inducible nitric oxide (NO) production was measured to evaluate macrophage activation.
Main Results:
- GCs significantly increased macrophage cell viability, protecting them from toxin-induced death.
- Macrophages exposed to GCs exhibited increased production of inducible nitric oxide (NO).
- GCs demonstrated a protective influence by blocking toxin-induced macrophage death and enhancing macrophage activation.
Conclusions:
- Polymeric GCs can neutralize Bacillus anthracis toxins and protect macrophages.
- GCs act as an activation signal for macrophages, stimulating their function and increasing NO production.
- These findings suggest GCs as promising candidates for novel vaccines and immunotherapeutics against anthrax.
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