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Alkane-induced edema formation and cutaneous barrier dysfunction.

S J Moloney1, J J Teal

  • 1Department of Toxicology, Avon Products, Suffern, NY 10901.

Archives of Dermatological Research
|January 1, 1988
PubMed
Summary

Repeated application of n-alkanes can cause skin irritation. Tetradecane was the strongest irritant, and increased skin permeability preceded edema formation, suggesting barrier dysfunction is key.

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Area of Science:

  • Toxicology
  • Dermatology
  • Structure-Activity Relationships

Background:

  • Mineral oils and hydrocarbons can cause skin irritation upon repeated topical application.
  • Understanding the mechanism of cumulative irritancy is crucial for product safety and formulation.

Purpose of the Study:

  • To investigate the structure-activity relationship of pure n-alkanes concerning cumulative irritancy.
  • To elucidate the mechanism underlying n-alkane-induced skin irritation in a mouse model.

Main Methods:

  • A structure-activity relationship study using pure n-alkanes applied topically to mouse ears over 4 days.
  • Assessment of ear edema and in vitro measurement of ear permeability to hydrocortisone.

Main Results:

  • Dodecane was non-irritating; tridecane caused irritation at 96 hours.
  • Tetradecane was the strongest irritant, showing significant ear thickness increase at 48 hours.
  • Increased ear permeability to hydrocortisone was observed 24 hours before edema, correlating with irritation severity.

Conclusions:

  • N-alkane chain length influences cumulative irritancy, with shorter chains like tetradecane being more potent.
  • Increased skin permeability and subsequent barrier dysfunction may be an early mechanism in n-alkane-induced irritation.
  • Findings suggest that loss of skin barrier function enhances alkane penetration, leading to irritation.

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