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Caspase-5: Structure, Pro-Inflammatory Activity and Evolution.

Leopold Eckhart1, Heinz Fischer2

  • 1Department of Dermatology, Medical University of Vienna, 1090 Vienna, Austria.

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Summary
This summary is machine-generated.

Caspase-5, a protease, triggers inflammation by forming inflammasomes in response to lipopolysaccharide (LPS). This process is crucial for defense against Gram-negative bacteria and may play a role in sepsis.

Keywords:
caspaseendotoxinevolutiongasdermingene duplicationinflammasomeinflammationlipopolysaccharidepyroptosissepsis

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Area of Science:

  • Immunology
  • Molecular Biology
  • Microbiology

Background:

  • Caspase-5 is a protease activated by lipopolysaccharide (LPS), a Gram-negative bacterial component.
  • Its expression significantly increases upon LPS exposure, unlike other caspases.

Purpose of the Study:

  • To review the structural features and regulatory mechanisms of caspase-5.
  • To explore the evolutionary aspects of pro-inflammatory caspases in mammals.
  • To discuss the role of caspase-5 in bacterial defense and sepsis.

Main Methods:

  • Literature review focusing on caspase-5 structure, function, and evolution.
  • Comparative analysis of caspase-5 and related caspases (e.g., caspase-4, caspase-11).

Main Results:

  • Caspase-5 forms non-canonical inflammasomes upon intracellular LPS binding.
  • Activated caspase-5 cleaves gasdermin D, leading to pore formation and cytokine release.
  • Interspecies differences in caspase evolution, particularly between humans and mice, were highlighted.

Conclusions:

  • Caspase-5 plays a key role in initiating inflammatory responses to Gram-negative bacteria.
  • Understanding caspase-5's evolution and regulation is vital for studying sepsis and host defense.