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b : baraya_sunda@yahoogroups.com 25 October 2011 • 3:00PM -0400

[Baraya_Sunda] moyan?
by Remi

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Basa keur budak, kuring sok dititah moyan ku indung. Ngan sok dicaram moyan saenggeus jam 10 isuk.

Geuning aya dasar ilmiah na euy eta panyaram indung teh!:))


Control of skin cancer by the circadian rhythm

    Shobhan Gaddameedhia,b,
    Christopher P. Selbya,
    William K. Kaufmannb,c,d,
    Robert C. Smarte, and
    Aziz Sancara,b,d,1

+ Author Affiliations

    Departments of aBiochemistry and Biophysics,
    cPathology and Laboratory Medicine,
    bLineberger Comprehensive Cancer Center, and
    dCenter for Environmental Health and Susceptibility, University of North Carolina School of Medicine, Chapel Hill, NC 27599; and
    eCell Signaling and Cancer Group, Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695

    Contributed by Aziz Sancar, September 16, 2011 (sent for review August 24, 2011)

Abstract

Skin cancer is the most common form of cancer in the United States. The main cause of this cancer is DNA damage induced by the UV component of sunlight. In humans and mice, UV damage is removed by the nucleotide excision repair system. Here, we report that a rate-limiting subunit of excision repair, the xeroderma pigmentosum group A (XPA) protein, and the excision repair rate exhibit daily rhythmicity in mouse skin, with a minimum in the morning and a maximum in the afternoon/evening. In parallel with the rhythmicity of repair rate, we find that mice exposed to UV radiation (UVR) at 4:00 AM display a decreased latency and about a fivefold increased multiplicity of skin cancer (invasive squamous cell carcinoma) than mice exposed to UVR at 4:00 PM. We conclude that time of day of exposure to UVR is a contributing factor to its carcinogenicity in mice, and possibly in humans.



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