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Related Experiment Videos

Cutaneous protease activity in the mouse ear vesicant model.

J C Powers1, C M Kam, K M Ricketts

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta 30332-0400, USA. james.powers@chemistry.gatech.edu

Journal of Applied Toxicology : JAT
|June 29, 2001
PubMed
Summary

Sulfur mustard exposure significantly increases elastase, tryptase, and calpain protease activity in mouse skin over time. These findings highlight the role of proteases in sulfur mustard (HD) skin injury, suggesting potential therapeutic targets.

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Area of Science:

  • Biochemistry
  • Toxicology
  • Dermatology

Background:

  • Sulfur mustard (HD) is a chemical warfare agent causing significant skin damage.
  • The precise molecular mechanisms underlying HD-induced skin injury are not fully understood.
  • Proteases are enzymes that break down proteins and are implicated in tissue damage and inflammation.

Purpose of the Study:

  • To investigate the activity of serine and cysteine proteases in mouse ear skin following exposure to sulfur mustard (HD).
  • To determine the time course of protease activity changes after HD exposure.
  • To assess the potential role of proteases in HD-induced skin injury and identify therapeutic targets.

Main Methods:

  • Mouse ear skin homogenates from HD-exposed and control groups were analyzed.

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  • Enzyme activity was measured using specific synthetic substrates for elastase, tryptase, chymase, cathepsin B, cathepsin H, and calpain.
  • Samples were collected at 3, 6, 12, and 24 hours post-exposure.

    • Main Results:

    • Elastase activity showed a significant increase (670% at 12h, 1900% at 24h) in HD-exposed skin compared to controls.
    • Tryptase and calpain activities were elevated (220% and 170% respectively) at 24 hours post-exposure.
    • No significant changes in elastase, tryptase, or calpain activity were observed at 3 and 6 hours post-exposure.

    Conclusions:

    • Protease activity, particularly elastase, is significantly altered in mouse skin following sulfur mustard exposure.
    • The data suggest that proteases play a crucial role in the pathogenesis of HD-induced skin injury.
    • Targeting these upregulated proteases may offer a therapeutic strategy to mitigate HD skin damage.