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A Data-Driven Approach to Quantifying Immune States in Sepsis
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Immune Response Resetting in Ongoing Sepsis.

Alexandre E Nowill1, Márcia C Fornazin2, Maria C Spago2

  • 1Integrated Center for Pediatric OncoHaematological Research, State University of Campinas, Campinas 13083-888, Brazil; aen@nowill.com.br.

Journal of Immunology (Baltimore, Md. : 1950)
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Summary
This summary is machine-generated.

Resetting immune responses with antigen re-exposure significantly improves sepsis survival. This approach modulates T cell activity and reduces harmful inflammation, offering a novel strategy beyond antibiotics alone for treating severe infections.

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Area of Science:

  • Immunology
  • Microbiology
  • Pharmacology

Background:

  • Severe infections, sepsis, and septic shock present treatment challenges due to detrimental immune responses.
  • Current antimicrobial therapies are often insufficient as morbidity and mortality stem from dysregulated immunity.

Purpose of the Study:

  • To test if repeated immune memory reactivation can reset unfavorable immune responses during sepsis.
  • To evaluate the efficacy of combining antimicrobial treatment with antigen re-exposure in a stringent sepsis model.

Main Methods:

  • Utilized a mouse model of polymicrobial sepsis induced by cecum ligation and puncture.
  • Administered antimicrobial drug (imipenem) alone or in combination with repeated antigen pool re-challenges post-sepsis induction.
  • Analyzed immune cell populations (T cells) and performed quantitative proteomics/lipidomics.

Main Results:

  • Combined imipenem and antigen re-challenge significantly increased survival (>5-fold) compared to imipenem alone (p < 0.0001).
  • Antigenic stimulation modulated T cell responses, reducing hyperactivation in memory subsets (CD8+ T cells) and preserving naive subsets.
  • Molecular analyses revealed reversion of sepsis-associated cytokine storm, inflammation, and altered lipid profiles (lysophosphatidylcholine/phosphatidylcholine ratio).

Conclusions:

  • Memory reactivation can reset hyperinflammatory responses to hypoinflammatory ones in antibiotic-treated sepsis, reducing mortality.
  • The beneficial effect relies on modulating the ongoing immune response via diverse antigen memory, not solely on pathogen-specific immunity.