Effect of α-tocopherol and N-acetylcysteine on benzoyl peroxide toxicity in human keratinocytes

✍ Scribed by Elisa Bellei; Cristina Rota; Stefania Bergamini; Paolo Manfredini; Alberto Albertazzi; Aldo Tomasi; Anna Iannone

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 162 KB
• Volume: 18
• Category: Article
• ISSN: 1095-6670
• DOI: 10.1002/jbt.20008

✦ Synopsis

Abstract

Benzoyl peroxide is a free‐radical generating compound widely used in the polymer industry and also in pharmaceuticals as antimicrobial agent to treat acne. However, benzoyl peroxide causes irritation and contact dermatitis in about 1% of patients. Concern over the use of this compound is motivated by the demonstration that it can also act as skin tumor promoter in mice. In addition, benzoyl peroxide induces DNA strand breaks in many cells, including keratinocytes. Benzoyl peroxide toxicity is presumably mediated by the formation of reactive free radicals and by the consumption of intracellular antioxidants.

In this work we investigated the effect of both the lipophilic antioxidant α‐tocopherol and the hydrophilic thiol donor N‐acetylcysteine (NAC) in human keratinocyte line HaCaT exposed to benzoyl peroxide. A protective effect against benzoyl peroxide cytotoxicity was achieved when cells were grown on a α‐tocopherol layer. On the contrary, the addition of α‐tocopherol dissolved in ethanol had a pro‐oxidant effect, leading to an enhancement of benzoyl peroxide toxicity. Cytotoxicity was also reduced adding NAC to the culture medium; the presence of both NAC and α‐tocopherol exerts a synergis‐ tic cytoprotection. © 2004 Wiley Periodicals, Inc. J Biochem Mol Toxicol 18:107–114, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jbt.20008