التفاصيل البيبلوغرافية
| العنوان: |
TNRC9 Downregulates BRCA1 Expression and Promotes Breast Cancer Aggressiveness. |
| المؤلفون: |
Jingxuan Shan1, DSouza, Shoba P.1, Bakhru, Sasha2, Al-Azwani, Eman K.3, Ascierto, Maria L.4, Sastry, Konduru S.1, Bedri, Shahinaz5, Kizhakayil, Dhanya1, Aigha, Idil I.1, Malek, Joel3, Al-Bozom, Issam6, Gehani, Salah7, Furtado, Stacia2, Mathiowitz, Edith2, Ena Wang4, Marincola, Francesco M.4, Chouchane, Lotfi1 loc2008@qatar-med.cornell.edu |
| المصدر: |
Cancer Research. May2013, Vol. 73 Issue 9, p2840-2849. 10p. |
| مصطلحات موضوعية: |
*BREAST cancer research, *CANCER, *GERM cells, *CELLS, *GENETIC mutation |
| مستخلص: |
Although the linkage between germline mutations of and hereditary breast/ovarian cancers is well BRCA1 established, recent evidence suggests that altered expression of wild-type BRCA1might contribute to the sporadic forms of breast cancer. The breast cancer gene trinucleotide-repeat-containing 9 (TNRC9 ; TOX3) has been associated with disease susceptibility but its function is undetermined. Here, we report that TNRC9 is often amplified and overexpressed in breast cancer, particularly in advanced breast cancer. Gene amplification was associated with reduced disease-free and metastasis-free survival rates. Ectopic expression of TNRC9 increased breast cancer cell proliferation, migration, and survival after exposure to apoptotic stimuli. These phenotypes were associated with tumor progression in a mouse model of breast cancer. Gene expression profiling, protein analysis, and assays of large datasets of breast and ovarian cancer samples suggested that TNRC9 and in silico BRCA1 expression were inversely correlated. Notably, we found that TNRC9 bound to both the promoter BRCA1 and the cAMP-responsive element-binding protein (CREB) complex, a regulator of BRCA1 transcription. In support of this connection, expression of TNRC9 downregulated expression of BRCA1 by altering themethylation status of its promoter. Our studies unveil a function for TNRC9 in breast cancer that highlights a new paradigmin BRCA1 regulation. [ABSTRACT FROM AUTHOR] |
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