Responses of THP-1 Cells to Bacillus anthracis
Author Information
Author(s): Christopher Bradburne, Myung-Chul Chung, Qin Zong, Karen Schlauch, Derong Liu, Taissia Popova, Anna Popova, Charles Bailey, Dan Soppet, Serguei Popov
Primary Institution: Center for Bio/Molecular Science and Engineering, US Naval Research Laboratory
Hypothesis
The study investigates the transcriptional and apoptotic responses of THP-1 cells when exposed to toxigenic and non-toxigenic strains of Bacillus anthracis.
Conclusion
The presence of the toxigenic strain delays apoptosis in THP-1 cells despite higher TNF-α secretion, suggesting a protective mechanism for the bacteria.
Supporting Evidence
- The toxigenic strain induces higher pro-inflammatory transcriptional responses.
- Apoptosis is delayed in THP-1 cells challenged with the toxigenic strain.
- CFLAR, an apoptotic inhibitor, is significantly upregulated during toxigenic strain infection.
- Both strains induce apoptosis, but through different mechanisms.
Takeaway
When certain bacteria attack immune cells, they can trick those cells into delaying their self-destruction, which helps the bacteria survive longer.
Methodology
THP-1 cells were exposed to B. anthracis Sterne (pXO1+) and Δ Sterne (pXO1-) spores, and their transcriptional and apoptotic responses were analyzed using microarrays and Real-Time PCR.
Limitations
The study primarily focuses on in vitro responses, which may not fully represent in vivo conditions.
Statistical Information
P-Value
p<0.01
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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