To identify biomarkers associated with mortality in Staphylococcus aureus sepsis through transcriptomic analysis in a murine model and validation in human patients.
Approach:
Murine Model: Conducted transcriptomic analysis in a murine model of S. aureus sepsis to identify genes distinguishing survivors from fatalities.
Human Validation: Evaluated identified candidate genes, particularly CR2, in patients with severe invasive bacterial infections.
Key Findings:
Complement receptor 2 (CR2) was significantly downregulated in deceased patients compared to survivors and healthy controls.
CR2 downregulation correlated with disease severity and was independent of complement factor 3, TLR2, and TNF-α.
B-cell depletion and CR2 downregulation were observed over time in infected mice.
Interpretation:
CR2 downregulation may reflect immune dysregulation associated with severe S. aureus infection and mortality.
Limitations:
The study primarily focuses on a murine model, which may not fully replicate human sepsis.
Further validation in larger clinical cohorts is necessary to confirm findings.
Conclusion:
CR2 downregulation is associated with severe infection and mortality in S. aureus sepsis.
by Pradeep Kumar Kopparapu, Meghshree Deshmukh, Santhilal Subhash, Majd Mohammad, Zhicheng Hu, Anders Jarneborn, Muhammad Arif, Marcela Pekna, Lars Ljungström, Gunnar Jacobsson, Ola Grimsholm, Tao Jin
A large Epic Cosmos analysis linked vaginal estrogen prescribing with lower rates of sepsis, hospital admission, and death following recurrent urinary tract infection, but researchers cautioned that prescribing may also mark broader differences in care.
