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[Cancer Research 63, 52-59, January 2003]
© 2003 American Association for Cancer Research

Carcinogenesis

Delineation of the Molecular Basis for Selenium-induced Growth Arrest in Human Prostate Cancer Cells by Oligonucleotide Array1

Yan Dong, Haitao Zhang, Lesleyann Hawthorn, Howard E. Ganther and Clement Ip2

Departments of Cancer Prevention [Y. D., C. I.], and Cancer Genetics [H. Z., L. H.], Roswell Park Cancer Institute, Buffalo, New York 14263, and Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin 53706 [H. E. G.]

Despite the growing interest in selenium intervention of prostate cancer in humans, scanty informationis currently available on the molecular mechanism of selenium action. Our past research indicated that methylseleninic acid (MSA) is an excellent reagent for investigating the anticancer effect of selenium in vitro. The present study was designed to examine the cellular and molecular effects of MSA in PC-3 human prostate cancer cells. After exposure to physiological concentrations of MSA, these cells exhibited a dose- and time-dependent inhibition of growth. MSA retarded cell cycle progression at multiple transition points without changing the proportion of cells in different phases of the cell cycle. Flow cytometric analysis of annexin V- and propidium iodide-labeled cells showed a marked induction of apoptosis by MSA. Array analysis with the Affymetrix human genome U95A chip was then applied to profile the gene expression changes that might mediate the effects of selenium. Gene profiling was done in a time course experiment (at 12, 24, 36, and 48 h) using synchronized cells. A large number of potential selenium-responsive genes with diverse biological functions were identified. These genes fell into 12 clusters of distinct kinetics pattern of modulation by MSA. The expression changes of 10 genes known to be critically involved in cell cycle regulation were selected for verification by Western analysis to determine the reliability of the array data. An agreement rate of 70% was obtained based on these confirmation experiments. The array data enabled us to focus on the role of potential key genes (e.g., GADD153, CHK2, p21WAF1, cyclin A, CDK1, and DHFR) that might be targets of MSA in impeding cell cycle progression. The data also provide valuable insights into novel biological effects of selenium, such as inhibition of cell invasion, DNA repair, and stimulation of transforming growth factor ß signaling. The present study demonstrates the utility of a genome-wide analysis to elucidate the mechanism of selenium chemoprevention.




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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
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Molecular Cancer Research Cancer Prevention Research
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Copyright © 2003 by the American Association for Cancer Research.