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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.
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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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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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On the Functional Overlap between Complement and Anti-Microbial Peptides.

Jana Zimmer1, James Hobkirk2, Fatima Mohamed3

  • 1Department of Infectious Diseases - Medical Microbiology and Hygiene, Ruprecht-Karls-University of Heidelberg , Heidelberg , Germany.

Frontiers in Immunology
|February 4, 2015
PubMed
Summary
This summary is machine-generated.

Activated complement and antimicrobial peptides share functions like cell instruction and LPS detoxification. Research in marine invertebrates, like horseshoe crabs, reveals insights into complement origins and potential therapeutic applications in inflammation.

Keywords:
acute inflammationdeficiencieshistidine tagimmune cellsinnate immunity

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Area of Science:

  • Immunology
  • Marine Biology
  • Biochemistry

Background:

  • Complement and antimicrobial peptides (AMPs) exhibit overlapping functions, including lytic, phagocytic, and chemo-attractant activities.
  • Both systems possess distinct lipopolysaccharide (LPS) detoxifying properties and may influence endotoxin tolerance.
  • Complement C3 homologs involved in opsonization are found in horseshoe crabs, suggesting evolutionary links.

Purpose of the Study:

  • To explore the shared functionalities between activated complement and AMPs.
  • To investigate the evolutionary origins of complement, particularly C3, in marine invertebrates.
  • To review the role of local complement production in modulating cellular immunity and its implications in disease.

Main Methods:

  • Comparative analysis of functional activities between complement and AMPs.
  • Identification and characterization of complement homologs in horseshoe crabs.
  • Review of in vivo studies using complement-deficient mouse models for parenchymatous disease.

Main Results:

  • Complement and AMPs share lytic, phagocytic, chemo-attractant, and cell instructive roles.
  • Horseshoe crabs possess AMPs that bind LPS and a functional C3 homolog involved in opsonization.
  • Local synthesis of complement components significantly impacts cellular immune responses in disease models.

Conclusions:

  • Complement and AMPs possess convergent functions and may potentiate each other's activities.
  • Marine invertebrates are a source of AMPs with pharmaceutical potential and offer insights into complement evolution.
  • Understanding local complement production is crucial for managing inflammatory diseases, with therapeutic implications for conditions like peritonitis and ischemia.