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Decrease of serum adenine nucleotide hydrolysis in an irritant contact dermatitis mice model: potential P2X7R

R F Zanin1, G L da Silva, T Erig

  • 1Programa de Pós-Graduação em Biologia Celular e Molecular, Pontificia Universidade Catolica do Rio Grande do Sul - PUCRS, Porto Alegre, RS, Brazil.

Molecular and Cellular Biochemistry
|March 17, 2015
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Summary

Croton oil (CrO) reduces ATP hydrolysis in mouse serum, impacting skin inflammation. Blocking P2X7 receptors with A438079 reversed these effects, suggesting P2X7R

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Area of Science:

  • Immunology
  • Dermatology
  • Biochemistry

Background:

  • Extracellular adenosine 5'-triphosphate (ATP) is a key signaling molecule in inflammation.
  • The P2X7 purinergic receptor (P2X7R) plays a crucial role in skin inflammation and irritant contact dermatitis (ICD).

Purpose of the Study:

  • To investigate the effects of croton oil (CrO) on ATP hydrolysis in mouse serum.
  • To explore the involvement of P2X7R in CrO-induced skin inflammation and cellular damage.

Main Methods:

  • Topical application of CrO on mice.
  • Measurement of ATP/ADPase activities in mouse blood serum.
  • Treatment with a selective P2X7R antagonist (A438079).
  • Assessment of keratinocyte viability and necrosis.

Main Results:

  • CrO significantly decreased soluble ATP/ADPase activities by approximately 50%.
  • P2X7R antagonist A438079 reversed the decrease in ATP/ADPase activity.
  • CrO induced keratinocyte necrosis, which was prevented by A438079 pre-treatment.
  • Results suggest CrO inhibits ATPDase activity, implicating CD39 in ICD pathogenesis.

Conclusions:

  • Croton oil inhibits ATPDase activity in mouse serum, contributing to irritant contact dermatitis.
  • P2X7R antagonism prevents CrO-induced keratinocyte necrosis.
  • P2X7R may regulate extracellular ATP levels, influencing skin inflammation.