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Related Concept Videos

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Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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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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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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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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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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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses
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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses

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Host Protease Activity on Bacterial Pathogens Promotes Complement and Antibiotic-Directed Killing.

Shaorong Chen1, Dongmei Zhang1, Alexandria-Jade Roberts1

  • 1Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX 77807, USA.

Pathogens (Basel, Switzerland)
|November 27, 2021
PubMed
Summary

Host neutrophil elastase destroys bacterial defenses against immune complement killing. This protease activity also boosts antibiotic effectiveness against Acinetobacter baumannii and Pseudomonas aeruginosa, revealing a new immune strategy.

Keywords:
antibioticsbacterial pathogenshost complement systemhost immune systemmultidrug resistant bacteriaprotease neutrophil elastase

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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Host immune responses combat bacterial evasion, but mechanisms remain incompletely understood.
  • Bacterial pathogens like Acinetobacter baumannii and Pseudomonas aeruginosa possess factors to evade host defenses, particularly complement-mediated killing.
  • The interplay between host proteases, complement system, and antibiotic efficacy in combating bacterial infections requires further elucidation.

Purpose of the Study:

  • To investigate the role of host protease neutrophil elastase in combating Acinetobacter baumannii and Pseudomonas aeruginosa infections.
  • To determine how neutrophil elastase affects bacterial factors involved in evading complement-directed killing.
  • To assess the impact of neutrophil elastase activity on bacterial susceptibility to antibiotics in the presence of serum.

Main Methods:

  • Treatment of Acinetobacter baumannii and Pseudomonas aeruginosa with purified neutrophil elastase.
  • Analysis of bacterial factors targeted by neutrophil elastase.
  • Assessment of complement-mediated killing of bacteria following protease treatment.
  • Evaluation of bacterial susceptibility to antibiotics in serum after exposure to neutrophil elastase.

Main Results:

  • Neutrophil elastase degrades key factors produced by Acinetobacter baumannii and Pseudomonas aeruginosa that inhibit serum-associated, complement-directed killing.
  • Protease activity of neutrophil elastase enhances the susceptibility of these bacteria to antibiotics when present in serum.
  • Demonstration that neutrophil elastase acts on bacteria to facilitate complement-mediated clearance.

Conclusions:

  • Host neutrophil elastase plays a significant role in overcoming bacterial evasion mechanisms against the complement system.
  • Neutrophil elastase activity enhances antibiotic efficacy against Gram-negative pathogens like Acinetobacter baumannii and Pseudomonas aeruginosa in a serum environment.
  • A novel paradigm is proposed where host protease activity synergizes with the complement system and antibiotics to eliminate bacterial pathogens.