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Related Experiment Videos

Topical calcineurin inhibitors decrease the production of UVB-induced thymine dimers from hairless mouse epidermis.

Christian Tran1, Jann Lübbe, Olivier Sorg

  • 1Department of Dermatology, University Hospital, Geneva, Switzerland. christian.tran@hcuge.ch

Dermatology (Basel, Switzerland)
|November 16, 2005
PubMed
Summary

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Topical calcineurin inhibitors, like tacrolimus, act as UVB filters, reducing DNA photodamage in skin. They do not, however, enhance the removal of existing DNA photoproducts after UV exposure.

Area of Science:

  • Dermatology
  • Photobiology
  • Immunosuppression

Background:

  • Post-transplantation immunosuppression with calcineurin inhibitors (e.g., cyclosporine A, tacrolimus) is linked to increased skin tumor incidence.
  • The theoretical concern of UV-related carcinogenesis from topical calcineurin inhibitor use on sun-exposed skin exists.

Purpose of the Study:

  • To investigate the effect of topical calcineurin inhibitors on UV-induced DNA photodamage.
  • To determine if topical calcineurin inhibitors possess UVB filtering properties.
  • To assess the impact on DNA photoproduct clearance.

Main Methods:

  • Hairless mice were pretreated with pimecrolimus cream, tacrolimus ointment, or vehicle.
  • Mice were exposed to UVB irradiation (1 J/cm2).

Related Experiment Videos

  • Epidermal thymine dimer levels were quantified 1 hour and 48 hours post-irradiation.

    • Main Results:

    • Tacrolimus demonstrated UVB filtering properties within liposome membranes.
    • Topical treatments significantly decreased epidermal thymine dimers post-UVB irradiation compared to controls.
    • UVB-induced apoptosis was less pronounced in treated mice.

    Conclusions:

    • Topical calcineurin inhibitors, including vehicle components, exhibit a filter effect against DNA photodamage.
    • These agents do not influence the natural clearance rate of DNA photoproducts.
    • Topical calcineurin inhibitors may offer a protective effect against UV-induced DNA damage.