Mar 4, 2011

Phosphorylation of histone H2AX is a powerful tool for detecting chemical photogenotoxicity

The Journal of Investigative Dermatology
Tatsushi ToyookaYuko Ibuki

Abstract

Several light-absorbing chemicals are known to show phototoxic effects involving many kinds of DNA damage, and are suspected of initiating skin cancer. In this study, we clarified that phosphorylated histone H2AX (γ-H2AX) (phosphorylated histone H2AX), which was produced with the induction of DNA double-strand breaks, is a sensitive photogenotoxic marker. The immortal human keratinocyte line HaCaT was treated with a library of 11 chemicals (including known strong and weak phototoxic chemicals, and nonphototoxic chemicals) and/or UVA exposure. γ-H2AX was generated after treatments with all phototoxic chemicals and UVA. The limit of detection using γ-H2AX was 100-1,000 times lower than that using cell viability and DNA gel electrophoresis. γ-H2AX was not generated following treatments with nonphototoxic chemicals and UVA. These results indicated that γ-H2AX is a powerful tool for detecting chemical photogenotoxicity.

Mentioned in this Paper

Malignant Neoplasm of Skin
H2AFX gene
H2AFX wt Allele
Keratinocyte
Mutagenicity Tests
Protein Phosphorylation
H2AX protein, human
Coumarins
Phototoxicity
Skin Neoplasms

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