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UV-induced immune suppression and photocarcinogenesis: chemoprevention by dietary botanical agents

Santosh K Katiyar1

  • 1Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA. skatiyar@uab.edu

Cancer Letters
|March 27, 2007
PubMed

Insights

Dietary botanicals like green tea polyphenols can prevent skin cancer by boosting immune responses against UV radiation. These agents promote DNA repair and enhance anti-tumor immunity, offering photoprotective benefits.

Area of Science:

  • Immunology
  • Dermatology
  • Photobiology

Background:

  • Ultraviolet (UV) radiation exposure is a known risk factor for skin cancer development.
  • UV-induced immune suppression impairs the body's ability to prevent skin cancer.
  • Understanding the mechanisms of UV immunosuppression is crucial for developing effective prevention strategies.

Purpose of the Study:

  • To review the photoprotective effects of specific dietary botanicals against UV radiation.
  • To elucidate the mechanisms by which these agents prevent UV-induced immunosuppression and photocarcinogenesis.
  • To highlight the potential of these chemopreventive agents as adjuncts in skin cancer prevention.

Main Methods:

  • Review of recent investigations and mechanistic studies on dietary agents.
  • Focus on green tea polyphenols, grape seed proanthocyanidins, and silymarin.
  • Analysis of evidence for their effects on UV-induced immune suppression and photocarcinogenesis.

Main Results:

  • Dietary botanicals inhibit UV-induced immunosuppression and photocarcinogenesis.
  • Mechanisms include induction of interleukin (IL)-12, IL-12-dependent DNA repair, and stimulation of cytotoxic T cells.
  • These agents demonstrate significant photoprotective efficacy.

Conclusions:

  • Selected dietary botanicals show promise in preventing UV-induced immune suppression and skin cancer.
  • Their mechanisms involve enhancing immune surveillance and DNA repair pathways.
  • These findings support their use as adjuncts for photoprotection and skin cancer prevention.

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