期刊
ONCOTARGET
卷 6, 期 9, 页码 6902-6914出版社
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.3125
关键词
BRCA1; EPA; Fish Oil; eIF2 center dot GTP center dot Met-tRNAi; uORF
资金
- NIH [CA78411, CA101034, U19 CA87427, 1RO1CA152312]
- Susan B. Komen Breast Cancer Research Foundation [BCTR0402565]
Most sporadic breast and ovarian cancers express low levels of the breast cancer susceptibility gene, BRCA1. The BRCA1 gene produces two transcripts, mRNAa and mRNAb. mRNAb, present in breast cancer but not in normal mammary epithelial cells, contains three upstream open reading frames (uORFs) in its 5'UTR and is translationally repressed. Comparable tandem uORFs are characteristically seen in mRNAs whose translational efficiency paradoxically increases when the overall translation rate is decreased due to phosphorylation of eukaryotic translation initiation factor 2 a (eIF2a). Here we show fish oil derived eicosopanthenoic acid (EPA) that induces eIF2a phosphorylation translationally up-regulates the expression of BRCA1 in human breast cancer cells. We demonstrate further that a diet rich in EPA strongly induces expression of BRCA1 in human breast cancer xenografts.
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