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Cancer Prevention Research
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Research Article

Methylselenocysteine Resets the Rhythmic Expression of Circadian and Growth-Regulatory Genes Disrupted by Nitrosomethylurea In vivo

Ming Zhu Fang, Xun Zhang and Helmut Zarbl
Ming Zhu Fang
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Xun Zhang
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Helmut Zarbl
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DOI: 10.1158/1940-6207.CAPR-09-0170 Published May 2010
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Abstract

Epidemiologic and animal studies indicate that disruption of circadian rhythm increases breast cancer risk. Previously, we showed that methylselenocysteine reduced the incidence of N-nitroso-N-methylurea (NMU)–induced mammary carcinomas in Fischer 344 rats by 63%. Methylselenocysteine also increased the expression of Period 2 (Per2) and D-binding protein (DBP), providing evidence for a link between circadian rhythm and chemoprevention. Here, we report that NMU disrupted the expression of core circadian genes (Per1, Per2, Cry1, Cry2, and RevErbAα) and circadian-controlled genes, including melatonin receptor 1α (MTNR1A), estrogen receptors (ERα and ERβ), and growth-regulatory genes (Trp53, p21, Gadd45α, and c-Myc) in mammary glands of Fischer 344 rats. By contrast, dietary methylselenocysteine (3 ppm selenium) given for 30 days, significantly enhanced the circadian expression of these genes (except for Cry1 and Cry2). The largest effect was on the levels of the Per2, MTNR1A, and ERβ mRNAs, which showed 16.5-fold, 4.7-fold, and 9.5-fold increases in their rhythm-adjusted means, respectively, and 44.5-fold, 6.5-fold, and 9.7-fold increases in amplitude as compared with the control diet, respectively. Methylselenocysteine also shifted the peak expression times of these genes to Zeitgeber time 12 (ZT12; lights off). Methylselenocysteine also induced rhythmic expression of Trp53, p21, and Gadd45α mRNAs with peak levels at ZT12, when c-Myc expression was at its lowest level. However, methylselenocysteine had no significant effect on the circadian expression of these genes in liver. These results suggest that dietary methylselenocysteine counteracted the disruptive effect of NMU on circadian expression of genes essential to normal mammary cell growth and differentiation. Cancer Prev Res; 3(5); 640–52. ©2010 AACR.

Footnotes

  • Note: Supplementary data for this article are available at Cancer Prevention Research Online (http://cancerprevres.aacrjournals.org/).

  • Received August 16, 2009.
  • Revision received February 2, 2010.
  • Accepted February 15, 2010.
  • ©2010 American Association for Cancer Research.
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Cancer Prevention Research: 3 (5)
May 2010
Volume 3, Issue 5
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Methylselenocysteine Resets the Rhythmic Expression of Circadian and Growth-Regulatory Genes Disrupted by Nitrosomethylurea In vivo
Ming Zhu Fang, Xun Zhang and Helmut Zarbl
Cancer Prev Res May 1 2010 (3) (5) 640-652; DOI: 10.1158/1940-6207.CAPR-09-0170

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Methylselenocysteine Resets the Rhythmic Expression of Circadian and Growth-Regulatory Genes Disrupted by Nitrosomethylurea In vivo
Ming Zhu Fang, Xun Zhang and Helmut Zarbl
Cancer Prev Res May 1 2010 (3) (5) 640-652; DOI: 10.1158/1940-6207.CAPR-09-0170
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