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  3. Antimicrobial Peptides And Systemic Inflammation: A Network Analysis.
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Production and Testing of Antimicrobial Peptides and Their Mimics
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Antimicrobial Peptides and Systemic Inflammation: A Network Analysis.

Fabiano Pinheiro da Silva1, Francisco Garcia Soriano1, Ludhmila Abrahão Hajjar1

  • 1Laboratório de Emergências Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil.

Immunity, Inflammation and Disease
|April 21, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Antimicrobial peptides play varied roles in critical illnesses like sepsis, COVID-19, and pancreatitis. Their immune responses differ based on the specific disease context, highlighting complex, context-dependent functions.

Keywords:
antimicrobial peptidesgene expressiongene networksinflammation

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genomics

Background:

  • Antimicrobial peptides (AMPs) are crucial for innate immunity with diverse actions.
  • Systemic inflammation is a hallmark of critical illnesses.

Purpose of the Study:

  • Investigate roles of cathelicidin (LL-37), alpha-defensins, S100A8, and S100A9 in sepsis, COVID-19, and pancreatitis.
  • Analyze their involvement in systemic inflammation using RNA-sequencing.

Main Methods:

  • Whole-blood bulk RNA-sequencing.
  • Gene co-expression network analysis.
  • Comparative analysis across three critical illness models.

Main Results:

  • In sepsis and severe COVID-19, cathelicidin and alpha-defensins synergize in innate immunity.
  • S100A8/S100A9 are linked to mitochondrial metabolism and ubiquitin binding.
  • Acute pancreatitis shows distinct patterns: CAMP co-expressed with S100A8/S100A9, alpha-defensins downregulated.

    • Conclusions:

    • AMPs contribute variably to systemic inflammation based on the insult.
    • Roles are complex and context-dependent in critical illness.
    • Findings offer insights into immune dysregulation in severe diseases.