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Related Concept Videos

Inflammatory Response II: Inflammatory Exudate and Tissue Repair01:24

Inflammatory Response II: Inflammatory Exudate and Tissue Repair

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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the...
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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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Inflammatory Response I: Vascular and Cellular01:30

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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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.
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Related Experiment Video

Updated: Dec 5, 2025

Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes
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Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes

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Staphylococcus aureus-Derived α-Hemolysin Evokes Generation of Specialized Pro-resolving Mediators Promoting

Paul M Jordan1, Jana Gerstmeier1, Simona Pace1

  • 1Institute of Pharmacy, Friedrich-Schiller-University Jena, Philosophenweg 14, 07743 Jena, Germany.

Cell Reports
|October 14, 2020
PubMed
Summary

Staphylococcus aureus α-hemolysin (Hla) triggers specialized pro-resolving mediators (SPMs) that aid tissue repair and bacterial clearance. This finding suggests Hla may promote infectious inflammation resolution.

Keywords:
Staphylococcus aureusinflammationlipid mediatorlipoxygenasepore-forming toxinspecialized pro-resolving mediatorsα-hemolysin

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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

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Area of Science:

  • Immunology
  • Microbiology
  • Molecular Biology

Background:

  • Infectious inflammation resolution mechanisms are not fully understood.
  • Specialized pro-resolving mediators (SPMs) are key to resolving inflammation, enhancing bacterial clearance, and promoting tissue repair.

Purpose of the Study:

  • To investigate the role of Staphylococcus aureus α-hemolysin (Hla) in inducing SPM biosynthesis.
  • To explore the potential beneficial functions of Hla in infectious inflammation resolution.

Main Methods:

  • Utilized human M2-like macrophages and mouse peritoneum models.
  • Assessed SPM production upon Hla stimulation, Hla depletion, 15-lipoxygenase-1 (15-LOX-1) knockdown, and ADAM10 inhibition.
  • Evaluated the effect of Hla-induced lipid mediators on planarian tissue regeneration.

Main Results:

  • Staphylococcus aureus α-hemolysin (Hla) potently elicits SPM biosynthesis in M2 macrophages and mouse peritoneum via 15-LOX-1 activation.
  • Hla-induced SPM production is dependent on Hla and 15-LOX-1, and its receptor ADAM10.
  • Lipid mediators from Hla-treated macrophages accelerate planarian regeneration, and Hla induces SPMs in vivo without causing inflammation.

Conclusions:

  • Staphylococcus aureus α-hemolysin (Hla) can stimulate host SPM production, suggesting a dual role in infection.
  • Hla may promote the resolution of infectious inflammation by enhancing SPM biosynthesis, counterbalancing its harmful effects.