Abstract
The present study was conducted to identify targets of selenium (Se) provided to cultured human cells in physiologically relevant doses and forms. Breast and prostate epithelial cells were supplemented with Se provided as 100 nM sodium selenite or high-Se serum and gene expression was profiled with DNA microarrays. Pure sodium selenite affected expression of 560 genes in MCF-10A breast cells, including 60 associated with the cell cycle (p = 2.8 × 10−16). Selenoprotein W (SEPW1) was the only selenoprotein messenger RNA (mRNA) increased by both sodium selenite (specific) and high-Se serum (physiologic). SEPW1 small interfering RNA inhibited G1-phase progression and increased G1-phase gene transcripts, while decreasing S-phase and G2/M-phase gene transcripts, indicating the cell cycle was interrupted at the G1/S transition. SEPW1 mRNA levels were maximal during G1-phase, dropped after the G1/S transition and increased again after G2/M-phase. SEPW1-underexpressing prostate cells had increased mRNA for BCL2, which can induce a G1 arrest, and decreased mRNA for RBBP8 and KPNA2, which modulate the Rb/p53 checkpoint pathway. These results suggest that SEPW1 and the G1/S transition are physiological targets of Se in breast and prostate epithelial cells.
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Abbreviations
- Se:
-
selenium
- SEPW1:
-
selenoprotein W
- GPX:
-
glutathione peroxidase
- FBS:
-
fetal bovine serum
- SAM:
-
significance analysis of microarrays
- GO:
-
gene ontology
- RT-PCR:
-
reverse transcriptase-polymerase chain reaction
- PBS:
-
phosphate-buffered saline
- RBBP8:
-
retinoblastoma binding protein 8
- KPNA2:
-
karyopherin alpha 2 (RAG cohort 1, importin alpha 1)
- BCL2:
-
B cell CLL/lymphoma 2
- TPR:
-
translocated promoter region [to activated MET oncogene]
- MET:
-
met proto-oncogene [hepatocyte growth factor receptor]
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Acknowledgements
US Department of Agriculture CRIS project no. 5306-51530-009-00D and no. 1235-52530-003-00 and NCMHD grant no. 1 P60 MD00222 supported this research. The UC Davis Cancer Center Gene Expression Resource supported by NCI Cancer Center Support Grant P30 CA93373 performed the microarray labeling, hybridizations, and scanning. Mention of trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the US Department of Agriculture nor does it imply approval to the exclusion of other products that may be suitable. The opinions expressed herein represent those of the authors and do not necessarily represent those of the US Department of Agriculture.
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Supplemental Table S2. Affymetrix DNA microarray probe sets affected by all three species of SEPW1 siRNA in RWPE-1 cells. (XLS 154 kb)
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Hawkes, W.C., Wang, T.T.Y., Alkan, Z. et al. Selenoprotein W Modulates Control of Cell Cycle Entry. Biol Trace Elem Res 131, 229–244 (2009). https://doi.org/10.1007/s12011-009-8367-0
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DOI: https://doi.org/10.1007/s12011-009-8367-0