Journal
MOLECULAR ONCOLOGY
Volume 5, Issue 6, Pages 538-544Publisher
WILEY
DOI: 10.1016/j.molonc.2011.08.002
Keywords
Breast Cancer; ER; Triple negative breast cancer; Target; NFIB
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Funding
- Korean Ministry of Education, Science and Technology [FPR08A2-080]
- Ministry of Health & Welfare, Republic of Korea [A084022]
- Korea Health Promotion Institute [A084022] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Background: The association between nuclear factor I/B (NFIB) gene and triple negative breast cancer has been previously suggested. Methods: We investigated the relationship between NFIB mRNA and protein expression and molecular subtypes of breast cancer as well as the effect of NFU silencing on the proliferation and apoptosis of breast cancer cells. Also, the clinical importance of NFIB expression was investigated in 163 breast cancer patients. Results: By using 20 frozen human breast cancer tissues and various breast cancer cell lines, we observed a significant high level of NFIB mRNA level in triple negative breast cancer. NFIB protein was upregulated in ER negative breast cancer tissues but the expression level was similar between HER2 subtype and triple negative subtype. The clinical significance of NFIB was further examined in a tissue microarray from 163 invasive breast cancer patients, and the immunohistochemistry results showed a significant association between NFIB expression and nuclear grade, ER, and HER2 expression status. NFIB positive tumors were more likely to have high nuclear grade, ER negativity and HER2 over-expression. HCC1954 cells transfected with siRNA against NFIB showed a significant reduction in cell proliferation and increase in apoptotic signaling pathway. Conclusions: Our results show a potential role of NFIB as a novel target in ER negative breast cancers. (C) 2011 Published by Elsevier B.V. on behalf of Federation of European Biochemical Societies.
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