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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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Acute Inflammation II: Local and Systemic Effects01:25

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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Inflammation01:38

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Updated: Apr 22, 2026

Production and Testing of Antimicrobial Peptides and Their Mimics
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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
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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Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization
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Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
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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.