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Related Experiment Videos

The PABA story.

B S Mackie1, L E Mackie

  • 1Prince Henry Hospital, Sydney, Australia.

The Australasian Journal of Dermatology
|March 31, 1999
PubMed
Summary
This summary is machine-generated.

Para-aminobenzoic acid (PABA) was a popular sunscreen but was found to be a common sensitizer. Its use was linked to autoimmune responses, leading to its gradual removal from sunscreens.

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Area of Science:

  • Dermatology
  • Photoprotection
  • Toxicology

Background:

  • Para-aminobenzoic acid (PABA) gained popularity as a sunscreen agent after World War II.
  • Its efficacy in UV protection made it a widely favored ingredient in sun care products.

Observation:

  • Dermatologists observed PABA to be a frequent cause of skin sensitization.
  • Cross-sensitization reactions occurred with structurally similar compounds, both topically and systemically.
  • Prolonged exposure to PABA and related chemicals was associated with the development of autoimmune conditions.

Findings:

  • PABA is a common sensitizer with a propensity for cross-reactivity.
  • Systemic exposure to PABA-like compounds can trigger autoimmune diseases.
  • Autoimmune responses observed include systemic lupus erythematosus and dermatomyositis.

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Implications:

  • The findings led to discussions within the Dermatological Association of Australia in 1964 and 1965.
  • These discussions contributed to the eventual phasing out of PABA from sunscreen formulations.
  • Understanding PABA's adverse effects is crucial for developing safer photoprotective agents.