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Erythropoiesis suppression is associated with anthrax lethal toxin-mediated pathogenic progression
Hsin-Hou Chang1, Tsung-Pao Wang, Po-Kong Chen
1Department of Molecular Biology and Human Genetics, Tzu-Chi University, Hualien, Taiwan ; Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan.
Plos One
|August 27, 2013
Summary
Anthrax lethal toxin (LT) impairs red blood cell production, causing anemia and hypoxia. Stimulating erythropoiesis with erythropoietin reduced mortality in mice, suggesting a therapeutic target for anthrax.
Area of Science:
- Pathogen biology
- Immunology
- Hematology
Background:
- Anthrax, caused by Bacillus anthracis, leads to high mortality.
- Lethal toxin (LT) is a key virulence factor, inhibiting MAPKKs and causing anthrax-like symptoms.
- Molecular pathogenesis, particularly regarding anemia and hypoxia, requires further investigation.
Purpose of the Study:
- To investigate the role of erythropoietic dysfunction in anthrax-induced anemia and hypoxia.
- To determine if LT directly affects erythroid progenitor cells and erythroblast differentiation.
- To evaluate the therapeutic potential of erythropoietin in mitigating LT-mediated pathogenesis.
Main Methods:
- Colony-forming cell assays to assess mouse erythroid progenitor cells.
- In vitro suppression assays using cord blood CD34(+)-derived erythroblasts.
- In vivo studies in C57BL/6J mice challenged with LT and treated with erythropoietin.
Main Results:
- LT significantly reduced erythroid progenitor cells in vitro.
- LT suppressed erythroblast survival and differentiation in a proteolytic activity-dependent manner.
- LT challenge led to decreased erythroblast numbers in mouse bone marrow; erythropoietin treatment ameliorated anemia and reduced mortality.
Conclusions:
- Suppressed erythropoiesis is a significant component of anthrax lethal toxin-mediated pathophysiology.
- Targeting erythropoiesis may offer a novel therapeutic strategy against anthrax.
- Further research into LT-mediated pathogenesis can aid in developing effective anthrax treatments.
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