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Related Experiment Videos

Human cutaneous irritation: induced hyporeactivity.

K Lammintausta1, H I Maibach, D Wilson

  • 1Department of Dermatology, University of California, San Francisco 94143.

Contact Dermatitis
|October 1, 1987
PubMed
Summary

Human skin reactivity to sodium lauryl sulfate (SLS) varies significantly between individuals and test sites. Repeated SLS exposure can induce a hyporeactive state, potentially causing false negatives in diagnostic patch tests.

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Area of Science:

  • Dermatology
  • Toxicology
  • Skin Physiology

Background:

  • Sodium lauryl sulfate (SLS) is a common surfactant used in consumer products.
  • SLS can induce skin irritation, but individual responses vary.
  • Understanding this variation is crucial for accurate skin assessments.

Purpose of the Study:

  • To investigate the variability in human skin responses to SLS.
  • To compare different application methods (patch vs. open) and testing conditions.
  • To identify factors influencing skin reactivity to SLS.

Main Methods:

  • Evaluated skin responses using visual scoring (VS), laser Doppler velocimetry (LDV), and transepidermal water loss (TEWL).
  • Compared reactions from simultaneous patch tests and repeated open applications.

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  • Assessed inter-subject and intra-subject (test site and time) variations in reactivity.

    • Main Results:

    • Previous open SLS exposure reduced subsequent patch test reactivity (p<0.05).
    • Inter-subject variation in reactivity was greater than variations due to test time or site.
    • Repeated exposure induced a hyporeactive state, with inconsistent TEWL changes.

    Conclusions:

    • Skin reactivity to SLS depends on multiple factors, including stratum corneum integrity and vascular reactivity.
    • Induced hyporeactivity may lead to false-negative results in diagnostic patch testing.
    • Individual skin characteristics significantly influence responses to chemical irritants.