Abstract
Circadian rhythm disturbance promotes of carcinogenesis and is associated with changes in clock genes and proteins expression. In the current study we observed that continu- ous light exposure potentiated skin carcinogenesis induced by 7,12-dimethylbenz[a]anthracene and 12-0-tetradecanoylphor- bol-13-acetate while melatonin had opposite effect. Carcinogenic exposure decreased BMAL1 and CRYI- expression in the skin, CLOCK expression was upregulated and CRYl downregulated in tumor compared to normal skin. BMAL1 expression increased under disrupted light regimen; melatonin treatment affected CLOCK expression in tumors and CRYI in skin at the carcinogens application sites.
MeSH terms
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9,10-Dimethyl-1,2-benzanthracene / toxicity
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ARNTL Transcription Factors / biosynthesis
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Animals
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CLOCK Proteins / biosynthesis*
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Cell Transformation, Neoplastic / chemically induced
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Cell Transformation, Neoplastic / metabolism*
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Cell Transformation, Neoplastic / pathology
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Cryptochromes / biosynthesis
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Gene Expression Regulation, Neoplastic*
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Lighting*
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Male
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Mice
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Neoplasm Proteins / biosynthesis*
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Skin Neoplasms / chemically induced
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Skin Neoplasms / metabolism*
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Skin Neoplasms / pathology
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Tetradecanoylphorbol Acetate / toxicity
Substances
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ARNTL Transcription Factors
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Bmal1 protein, mouse
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Cry1 protein, mouse
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Cryptochromes
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Neoplasm Proteins
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9,10-Dimethyl-1,2-benzanthracene
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CLOCK Proteins
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Clock protein, mouse
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Tetradecanoylphorbol Acetate